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qemu-e2k/kvm-all.c
Gu Zheng 4c055ab54f cpu: Reclaim vCPU objects 
In order to deal well with the kvm vcpus (which can not be removed without any
protection), we do not close KVM vcpu fd, just record and mark it as stopped
into a list, so that we can reuse it for the appending cpu hot-add request if
possible. It is also the approach that kvm guys suggested:
https://www.mail-archive.com/kvm@vger.kernel.org/msg102839.html

Signed-off-by: Chen Fan <chen.fan.fnst@cn.fujitsu.com>
Signed-off-by: Gu Zheng <guz.fnst@cn.fujitsu.com>
Signed-off-by: Zhu Guihua <zhugh.fnst@cn.fujitsu.com>
Signed-off-by: Bharata B Rao <bharata@linux.vnet.ibm.com>
               [- Explicit CPU_REMOVE() from qemu_kvm/tcg_destroy_vcpu()
                  isn't needed as it is done from cpu_exec_exit()
                - Use iothread mutex instead of global mutex during
                  destroy
                - Don't cleanup vCPU object from vCPU thread context
                  but leave it to the callers (device_add/device_del)]
Reviewed-by: Thomas Huth <thuth@redhat.com>
Reviewed-by: David Gibson <david@gibson.dropbear.id.au>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
2016-05-30 14:03:59 +10:00

2467 lines
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/*
* QEMU KVM support
*
* Copyright IBM, Corp. 2008
* Red Hat, Inc. 2008
*
* Authors:
* Anthony Liguori <aliguori@us.ibm.com>
* Glauber Costa <gcosta@redhat.com>
*
* This work is licensed under the terms of the GNU GPL, version 2 or later.
* See the COPYING file in the top-level directory.
*
*/
#include "qemu/osdep.h"
#include <sys/ioctl.h>
#include <sys/mman.h>
#include <linux/kvm.h>
#include "qemu-common.h"
#include "qemu/atomic.h"
#include "qemu/option.h"
#include "qemu/config-file.h"
#include "qemu/error-report.h"
#include "hw/hw.h"
#include "hw/pci/msi.h"
#include "hw/s390x/adapter.h"
#include "exec/gdbstub.h"
#include "sysemu/kvm_int.h"
#include "qemu/bswap.h"
#include "exec/memory.h"
#include "exec/ram_addr.h"
#include "exec/address-spaces.h"
#include "qemu/event_notifier.h"
#include "trace.h"
#include "hw/irq.h"
#include "hw/boards.h"
/* This check must be after config-host.h is included */
#ifdef CONFIG_EVENTFD
#include <sys/eventfd.h>
#endif
/* KVM uses PAGE_SIZE in its definition of KVM_COALESCED_MMIO_MAX. We
* need to use the real host PAGE_SIZE, as that's what KVM will use.
*/
#define PAGE_SIZE getpagesize()
//#define DEBUG_KVM
#ifdef DEBUG_KVM
#define DPRINTF(fmt, ...) \
do { fprintf(stderr, fmt, ## __VA_ARGS__); } while (0)
#else
#define DPRINTF(fmt, ...) \
do { } while (0)
#endif
#define KVM_MSI_HASHTAB_SIZE 256
struct KVMParkedVcpu {
unsigned long vcpu_id;
int kvm_fd;
QLIST_ENTRY(KVMParkedVcpu) node;
};
struct KVMState
{
AccelState parent_obj;
int nr_slots;
int fd;
int vmfd;
int coalesced_mmio;
struct kvm_coalesced_mmio_ring *coalesced_mmio_ring;
bool coalesced_flush_in_progress;
int broken_set_mem_region;
int vcpu_events;
int robust_singlestep;
int debugregs;
#ifdef KVM_CAP_SET_GUEST_DEBUG
struct kvm_sw_breakpoint_head kvm_sw_breakpoints;
#endif
int many_ioeventfds;
int intx_set_mask;
/* The man page (and posix) say ioctl numbers are signed int, but
* they're not. Linux, glibc and *BSD all treat ioctl numbers as
* unsigned, and treating them as signed here can break things */
unsigned irq_set_ioctl;
unsigned int sigmask_len;
GHashTable *gsimap;
#ifdef KVM_CAP_IRQ_ROUTING
struct kvm_irq_routing *irq_routes;
int nr_allocated_irq_routes;
unsigned long *used_gsi_bitmap;
unsigned int gsi_count;
QTAILQ_HEAD(msi_hashtab, KVMMSIRoute) msi_hashtab[KVM_MSI_HASHTAB_SIZE];
#endif
KVMMemoryListener memory_listener;
QLIST_HEAD(, KVMParkedVcpu) kvm_parked_vcpus;
};
KVMState *kvm_state;
bool kvm_kernel_irqchip;
bool kvm_split_irqchip;
bool kvm_async_interrupts_allowed;
bool kvm_halt_in_kernel_allowed;
bool kvm_eventfds_allowed;
bool kvm_irqfds_allowed;
bool kvm_resamplefds_allowed;
bool kvm_msi_via_irqfd_allowed;
bool kvm_gsi_routing_allowed;
bool kvm_gsi_direct_mapping;
bool kvm_allowed;
bool kvm_readonly_mem_allowed;
bool kvm_vm_attributes_allowed;
bool kvm_direct_msi_allowed;
bool kvm_ioeventfd_any_length_allowed;
static const KVMCapabilityInfo kvm_required_capabilites[] = {
KVM_CAP_INFO(USER_MEMORY),
KVM_CAP_INFO(DESTROY_MEMORY_REGION_WORKS),
KVM_CAP_LAST_INFO
};
static KVMSlot *kvm_get_free_slot(KVMMemoryListener *kml)
{
KVMState *s = kvm_state;
int i;
for (i = 0; i < s->nr_slots; i++) {
if (kml->slots[i].memory_size == 0) {
return &kml->slots[i];
}
}
return NULL;
}
bool kvm_has_free_slot(MachineState *ms)
{
KVMState *s = KVM_STATE(ms->accelerator);
return kvm_get_free_slot(&s->memory_listener);
}
static KVMSlot *kvm_alloc_slot(KVMMemoryListener *kml)
{
KVMSlot *slot = kvm_get_free_slot(kml);
if (slot) {
return slot;
}
fprintf(stderr, "%s: no free slot available\n", __func__);
abort();
}
static KVMSlot *kvm_lookup_matching_slot(KVMMemoryListener *kml,
hwaddr start_addr,
hwaddr end_addr)
{
KVMState *s = kvm_state;
int i;
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &kml->slots[i];
if (start_addr == mem->start_addr &&
end_addr == mem->start_addr + mem->memory_size) {
return mem;
}
}
return NULL;
}
/*
* Find overlapping slot with lowest start address
*/
static KVMSlot *kvm_lookup_overlapping_slot(KVMMemoryListener *kml,
hwaddr start_addr,
hwaddr end_addr)
{
KVMState *s = kvm_state;
KVMSlot *found = NULL;
int i;
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &kml->slots[i];
if (mem->memory_size == 0 ||
(found && found->start_addr < mem->start_addr)) {
continue;
}
if (end_addr > mem->start_addr &&
start_addr < mem->start_addr + mem->memory_size) {
found = mem;
}
}
return found;
}
int kvm_physical_memory_addr_from_host(KVMState *s, void *ram,
hwaddr *phys_addr)
{
KVMMemoryListener *kml = &s->memory_listener;
int i;
for (i = 0; i < s->nr_slots; i++) {
KVMSlot *mem = &kml->slots[i];
if (ram >= mem->ram && ram < mem->ram + mem->memory_size) {
*phys_addr = mem->start_addr + (ram - mem->ram);
return 1;
}
}
return 0;
}
static int kvm_set_user_memory_region(KVMMemoryListener *kml, KVMSlot *slot)
{
KVMState *s = kvm_state;
struct kvm_userspace_memory_region mem;
mem.slot = slot->slot | (kml->as_id << 16);
mem.guest_phys_addr = slot->start_addr;
mem.userspace_addr = (unsigned long)slot->ram;
mem.flags = slot->flags;
if (slot->memory_size && mem.flags & KVM_MEM_READONLY) {
/* Set the slot size to 0 before setting the slot to the desired
* value. This is needed based on KVM commit 75d61fbc. */
mem.memory_size = 0;
kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
}
mem.memory_size = slot->memory_size;
return kvm_vm_ioctl(s, KVM_SET_USER_MEMORY_REGION, &mem);
}
int kvm_destroy_vcpu(CPUState *cpu)
{
KVMState *s = kvm_state;
long mmap_size;
struct KVMParkedVcpu *vcpu = NULL;
int ret = 0;
DPRINTF("kvm_destroy_vcpu\n");
mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
if (mmap_size < 0) {
ret = mmap_size;
DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
goto err;
}
ret = munmap(cpu->kvm_run, mmap_size);
if (ret < 0) {
goto err;
}
vcpu = g_malloc0(sizeof(*vcpu));
vcpu->vcpu_id = kvm_arch_vcpu_id(cpu);
vcpu->kvm_fd = cpu->kvm_fd;
QLIST_INSERT_HEAD(&kvm_state->kvm_parked_vcpus, vcpu, node);
err:
return ret;
}
static int kvm_get_vcpu(KVMState *s, unsigned long vcpu_id)
{
struct KVMParkedVcpu *cpu;
QLIST_FOREACH(cpu, &s->kvm_parked_vcpus, node) {
if (cpu->vcpu_id == vcpu_id) {
int kvm_fd;
QLIST_REMOVE(cpu, node);
kvm_fd = cpu->kvm_fd;
g_free(cpu);
return kvm_fd;
}
}
return kvm_vm_ioctl(s, KVM_CREATE_VCPU, (void *)vcpu_id);
}
int kvm_init_vcpu(CPUState *cpu)
{
KVMState *s = kvm_state;
long mmap_size;
int ret;
DPRINTF("kvm_init_vcpu\n");
ret = kvm_get_vcpu(s, kvm_arch_vcpu_id(cpu));
if (ret < 0) {
DPRINTF("kvm_create_vcpu failed\n");
goto err;
}
cpu->kvm_fd = ret;
cpu->kvm_state = s;
cpu->kvm_vcpu_dirty = true;
mmap_size = kvm_ioctl(s, KVM_GET_VCPU_MMAP_SIZE, 0);
if (mmap_size < 0) {
ret = mmap_size;
DPRINTF("KVM_GET_VCPU_MMAP_SIZE failed\n");
goto err;
}
cpu->kvm_run = mmap(NULL, mmap_size, PROT_READ | PROT_WRITE, MAP_SHARED,
cpu->kvm_fd, 0);
if (cpu->kvm_run == MAP_FAILED) {
ret = -errno;
DPRINTF("mmap'ing vcpu state failed\n");
goto err;
}
if (s->coalesced_mmio && !s->coalesced_mmio_ring) {
s->coalesced_mmio_ring =
(void *)cpu->kvm_run + s->coalesced_mmio * PAGE_SIZE;
}
ret = kvm_arch_init_vcpu(cpu);
err:
return ret;
}
/*
* dirty pages logging control
*/
static int kvm_mem_flags(MemoryRegion *mr)
{
bool readonly = mr->readonly || memory_region_is_romd(mr);
int flags = 0;
if (memory_region_get_dirty_log_mask(mr) != 0) {
flags |= KVM_MEM_LOG_DIRTY_PAGES;
}
if (readonly && kvm_readonly_mem_allowed) {
flags |= KVM_MEM_READONLY;
}
return flags;
}
static int kvm_slot_update_flags(KVMMemoryListener *kml, KVMSlot *mem,
MemoryRegion *mr)
{
int old_flags;
old_flags = mem->flags;
mem->flags = kvm_mem_flags(mr);
/* If nothing changed effectively, no need to issue ioctl */
if (mem->flags == old_flags) {
return 0;
}
return kvm_set_user_memory_region(kml, mem);
}
static int kvm_section_update_flags(KVMMemoryListener *kml,
MemoryRegionSection *section)
{
hwaddr phys_addr = section->offset_within_address_space;
ram_addr_t size = int128_get64(section->size);
KVMSlot *mem = kvm_lookup_matching_slot(kml, phys_addr, phys_addr + size);
if (mem == NULL) {
return 0;
} else {
return kvm_slot_update_flags(kml, mem, section->mr);
}
}
static void kvm_log_start(MemoryListener *listener,
MemoryRegionSection *section,
int old, int new)
{
KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
int r;
if (old != 0) {
return;
}
r = kvm_section_update_flags(kml, section);
if (r < 0) {
abort();
}
}
static void kvm_log_stop(MemoryListener *listener,
MemoryRegionSection *section,
int old, int new)
{
KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
int r;
if (new != 0) {
return;
}
r = kvm_section_update_flags(kml, section);
if (r < 0) {
abort();
}
}
/* get kvm's dirty pages bitmap and update qemu's */
static int kvm_get_dirty_pages_log_range(MemoryRegionSection *section,
unsigned long *bitmap)
{
ram_addr_t start = section->offset_within_region +
memory_region_get_ram_addr(section->mr);
ram_addr_t pages = int128_get64(section->size) / getpagesize();
cpu_physical_memory_set_dirty_lebitmap(bitmap, start, pages);
return 0;
}
#define ALIGN(x, y) (((x)+(y)-1) & ~((y)-1))
/**
* kvm_physical_sync_dirty_bitmap - Grab dirty bitmap from kernel space
* This function updates qemu's dirty bitmap using
* memory_region_set_dirty(). This means all bits are set
* to dirty.
*
* @start_add: start of logged region.
* @end_addr: end of logged region.
*/
static int kvm_physical_sync_dirty_bitmap(KVMMemoryListener *kml,
MemoryRegionSection *section)
{
KVMState *s = kvm_state;
unsigned long size, allocated_size = 0;
struct kvm_dirty_log d = {};
KVMSlot *mem;
int ret = 0;
hwaddr start_addr = section->offset_within_address_space;
hwaddr end_addr = start_addr + int128_get64(section->size);
d.dirty_bitmap = NULL;
while (start_addr < end_addr) {
mem = kvm_lookup_overlapping_slot(kml, start_addr, end_addr);
if (mem == NULL) {
break;
}
/* XXX bad kernel interface alert
* For dirty bitmap, kernel allocates array of size aligned to
* bits-per-long. But for case when the kernel is 64bits and
* the userspace is 32bits, userspace can't align to the same
* bits-per-long, since sizeof(long) is different between kernel
* and user space. This way, userspace will provide buffer which
* may be 4 bytes less than the kernel will use, resulting in
* userspace memory corruption (which is not detectable by valgrind
* too, in most cases).
* So for now, let's align to 64 instead of HOST_LONG_BITS here, in
* a hope that sizeof(long) won't become >8 any time soon.
*/
size = ALIGN(((mem->memory_size) >> TARGET_PAGE_BITS),
/*HOST_LONG_BITS*/ 64) / 8;
if (!d.dirty_bitmap) {
d.dirty_bitmap = g_malloc(size);
} else if (size > allocated_size) {
d.dirty_bitmap = g_realloc(d.dirty_bitmap, size);
}
allocated_size = size;
memset(d.dirty_bitmap, 0, allocated_size);
d.slot = mem->slot | (kml->as_id << 16);
if (kvm_vm_ioctl(s, KVM_GET_DIRTY_LOG, &d) == -1) {
DPRINTF("ioctl failed %d\n", errno);
ret = -1;
break;
}
kvm_get_dirty_pages_log_range(section, d.dirty_bitmap);
start_addr = mem->start_addr + mem->memory_size;
}
g_free(d.dirty_bitmap);
return ret;
}
static void kvm_coalesce_mmio_region(MemoryListener *listener,
MemoryRegionSection *secion,
hwaddr start, hwaddr size)
{
KVMState *s = kvm_state;
if (s->coalesced_mmio) {
struct kvm_coalesced_mmio_zone zone;
zone.addr = start;
zone.size = size;
zone.pad = 0;
(void)kvm_vm_ioctl(s, KVM_REGISTER_COALESCED_MMIO, &zone);
}
}
static void kvm_uncoalesce_mmio_region(MemoryListener *listener,
MemoryRegionSection *secion,
hwaddr start, hwaddr size)
{
KVMState *s = kvm_state;
if (s->coalesced_mmio) {
struct kvm_coalesced_mmio_zone zone;
zone.addr = start;
zone.size = size;
zone.pad = 0;
(void)kvm_vm_ioctl(s, KVM_UNREGISTER_COALESCED_MMIO, &zone);
}
}
int kvm_check_extension(KVMState *s, unsigned int extension)
{
int ret;
ret = kvm_ioctl(s, KVM_CHECK_EXTENSION, extension);
if (ret < 0) {
ret = 0;
}
return ret;
}
int kvm_vm_check_extension(KVMState *s, unsigned int extension)
{
int ret;
ret = kvm_vm_ioctl(s, KVM_CHECK_EXTENSION, extension);
if (ret < 0) {
/* VM wide version not implemented, use global one instead */
ret = kvm_check_extension(s, extension);
}
return ret;
}
static uint32_t adjust_ioeventfd_endianness(uint32_t val, uint32_t size)
{
#if defined(HOST_WORDS_BIGENDIAN) != defined(TARGET_WORDS_BIGENDIAN)
/* The kernel expects ioeventfd values in HOST_WORDS_BIGENDIAN
* endianness, but the memory core hands them in target endianness.
* For example, PPC is always treated as big-endian even if running
* on KVM and on PPC64LE. Correct here.
*/
switch (size) {
case 2:
val = bswap16(val);
break;
case 4:
val = bswap32(val);
break;
}
#endif
return val;
}
static int kvm_set_ioeventfd_mmio(int fd, hwaddr addr, uint32_t val,
bool assign, uint32_t size, bool datamatch)
{
int ret;
struct kvm_ioeventfd iofd = {
.datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
.addr = addr,
.len = size,
.flags = 0,
.fd = fd,
};
if (!kvm_enabled()) {
return -ENOSYS;
}
if (datamatch) {
iofd.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
}
if (!assign) {
iofd.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
}
ret = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &iofd);
if (ret < 0) {
return -errno;
}
return 0;
}
static int kvm_set_ioeventfd_pio(int fd, uint16_t addr, uint16_t val,
bool assign, uint32_t size, bool datamatch)
{
struct kvm_ioeventfd kick = {
.datamatch = datamatch ? adjust_ioeventfd_endianness(val, size) : 0,
.addr = addr,
.flags = KVM_IOEVENTFD_FLAG_PIO,
.len = size,
.fd = fd,
};
int r;
if (!kvm_enabled()) {
return -ENOSYS;
}
if (datamatch) {
kick.flags |= KVM_IOEVENTFD_FLAG_DATAMATCH;
}
if (!assign) {
kick.flags |= KVM_IOEVENTFD_FLAG_DEASSIGN;
}
r = kvm_vm_ioctl(kvm_state, KVM_IOEVENTFD, &kick);
if (r < 0) {
return r;
}
return 0;
}
static int kvm_check_many_ioeventfds(void)
{
/* Userspace can use ioeventfd for io notification. This requires a host
* that supports eventfd(2) and an I/O thread; since eventfd does not
* support SIGIO it cannot interrupt the vcpu.
*
* Older kernels have a 6 device limit on the KVM io bus. Find out so we
* can avoid creating too many ioeventfds.
*/
#if defined(CONFIG_EVENTFD)
int ioeventfds[7];
int i, ret = 0;
for (i = 0; i < ARRAY_SIZE(ioeventfds); i++) {
ioeventfds[i] = eventfd(0, EFD_CLOEXEC);
if (ioeventfds[i] < 0) {
break;
}
ret = kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, true, 2, true);
if (ret < 0) {
close(ioeventfds[i]);
break;
}
}
/* Decide whether many devices are supported or not */
ret = i == ARRAY_SIZE(ioeventfds);
while (i-- > 0) {
kvm_set_ioeventfd_pio(ioeventfds[i], 0, i, false, 2, true);
close(ioeventfds[i]);
}
return ret;
#else
return 0;
#endif
}
static const KVMCapabilityInfo *
kvm_check_extension_list(KVMState *s, const KVMCapabilityInfo *list)
{
while (list->name) {
if (!kvm_check_extension(s, list->value)) {
return list;
}
list++;
}
return NULL;
}
static void kvm_set_phys_mem(KVMMemoryListener *kml,
MemoryRegionSection *section, bool add)
{
KVMState *s = kvm_state;
KVMSlot *mem, old;
int err;
MemoryRegion *mr = section->mr;
bool writeable = !mr->readonly && !mr->rom_device;
hwaddr start_addr = section->offset_within_address_space;
ram_addr_t size = int128_get64(section->size);
void *ram = NULL;
unsigned delta;
/* kvm works in page size chunks, but the function may be called
with sub-page size and unaligned start address. Pad the start
address to next and truncate size to previous page boundary. */
delta = qemu_real_host_page_size - (start_addr & ~qemu_real_host_page_mask);
delta &= ~qemu_real_host_page_mask;
if (delta > size) {
return;
}
start_addr += delta;
size -= delta;
size &= qemu_real_host_page_mask;
if (!size || (start_addr & ~qemu_real_host_page_mask)) {
return;
}
if (!memory_region_is_ram(mr)) {
if (writeable || !kvm_readonly_mem_allowed) {
return;
} else if (!mr->romd_mode) {
/* If the memory device is not in romd_mode, then we actually want
* to remove the kvm memory slot so all accesses will trap. */
add = false;
}
}
ram = memory_region_get_ram_ptr(mr) + section->offset_within_region + delta;
while (1) {
mem = kvm_lookup_overlapping_slot(kml, start_addr, start_addr + size);
if (!mem) {
break;
}
if (add && start_addr >= mem->start_addr &&
(start_addr + size <= mem->start_addr + mem->memory_size) &&
(ram - start_addr == mem->ram - mem->start_addr)) {
/* The new slot fits into the existing one and comes with
* identical parameters - update flags and done. */
kvm_slot_update_flags(kml, mem, mr);
return;
}
old = *mem;
if (mem->flags & KVM_MEM_LOG_DIRTY_PAGES) {
kvm_physical_sync_dirty_bitmap(kml, section);
}
/* unregister the overlapping slot */
mem->memory_size = 0;
err = kvm_set_user_memory_region(kml, mem);
if (err) {
fprintf(stderr, "%s: error unregistering overlapping slot: %s\n",
__func__, strerror(-err));
abort();
}
/* Workaround for older KVM versions: we can't join slots, even not by
* unregistering the previous ones and then registering the larger
* slot. We have to maintain the existing fragmentation. Sigh.
*
* This workaround assumes that the new slot starts at the same
* address as the first existing one. If not or if some overlapping
* slot comes around later, we will fail (not seen in practice so far)
* - and actually require a recent KVM version. */
if (s->broken_set_mem_region &&
old.start_addr == start_addr && old.memory_size < size && add) {
mem = kvm_alloc_slot(kml);
mem->memory_size = old.memory_size;
mem->start_addr = old.start_addr;
mem->ram = old.ram;
mem->flags = kvm_mem_flags(mr);
err = kvm_set_user_memory_region(kml, mem);
if (err) {
fprintf(stderr, "%s: error updating slot: %s\n", __func__,
strerror(-err));
abort();
}
start_addr += old.memory_size;
ram += old.memory_size;
size -= old.memory_size;
continue;
}
/* register prefix slot */
if (old.start_addr < start_addr) {
mem = kvm_alloc_slot(kml);
mem->memory_size = start_addr - old.start_addr;
mem->start_addr = old.start_addr;
mem->ram = old.ram;
mem->flags = kvm_mem_flags(mr);
err = kvm_set_user_memory_region(kml, mem);
if (err) {
fprintf(stderr, "%s: error registering prefix slot: %s\n",
__func__, strerror(-err));
#ifdef TARGET_PPC
fprintf(stderr, "%s: This is probably because your kernel's " \
"PAGE_SIZE is too big. Please try to use 4k " \
"PAGE_SIZE!\n", __func__);
#endif
abort();
}
}
/* register suffix slot */
if (old.start_addr + old.memory_size > start_addr + size) {
ram_addr_t size_delta;
mem = kvm_alloc_slot(kml);
mem->start_addr = start_addr + size;
size_delta = mem->start_addr - old.start_addr;
mem->memory_size = old.memory_size - size_delta;
mem->ram = old.ram + size_delta;
mem->flags = kvm_mem_flags(mr);
err = kvm_set_user_memory_region(kml, mem);
if (err) {
fprintf(stderr, "%s: error registering suffix slot: %s\n",
__func__, strerror(-err));
abort();
}
}
}
/* in case the KVM bug workaround already "consumed" the new slot */
if (!size) {
return;
}
if (!add) {
return;
}
mem = kvm_alloc_slot(kml);
mem->memory_size = size;
mem->start_addr = start_addr;
mem->ram = ram;
mem->flags = kvm_mem_flags(mr);
err = kvm_set_user_memory_region(kml, mem);
if (err) {
fprintf(stderr, "%s: error registering slot: %s\n", __func__,
strerror(-err));
abort();
}
}
static void kvm_region_add(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
memory_region_ref(section->mr);
kvm_set_phys_mem(kml, section, true);
}
static void kvm_region_del(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
kvm_set_phys_mem(kml, section, false);
memory_region_unref(section->mr);
}
static void kvm_log_sync(MemoryListener *listener,
MemoryRegionSection *section)
{
KVMMemoryListener *kml = container_of(listener, KVMMemoryListener, listener);
int r;
r = kvm_physical_sync_dirty_bitmap(kml, section);
if (r < 0) {
abort();
}
}
static void kvm_mem_ioeventfd_add(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data,
EventNotifier *e)
{
int fd = event_notifier_get_fd(e);
int r;
r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
data, true, int128_get64(section->size),
match_data);
if (r < 0) {
fprintf(stderr, "%s: error adding ioeventfd: %s\n",
__func__, strerror(-r));
abort();
}
}
static void kvm_mem_ioeventfd_del(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data,
EventNotifier *e)
{
int fd = event_notifier_get_fd(e);
int r;
r = kvm_set_ioeventfd_mmio(fd, section->offset_within_address_space,
data, false, int128_get64(section->size),
match_data);
if (r < 0) {
abort();
}
}
static void kvm_io_ioeventfd_add(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data,
EventNotifier *e)
{
int fd = event_notifier_get_fd(e);
int r;
r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
data, true, int128_get64(section->size),
match_data);
if (r < 0) {
fprintf(stderr, "%s: error adding ioeventfd: %s\n",
__func__, strerror(-r));
abort();
}
}
static void kvm_io_ioeventfd_del(MemoryListener *listener,
MemoryRegionSection *section,
bool match_data, uint64_t data,
EventNotifier *e)
{
int fd = event_notifier_get_fd(e);
int r;
r = kvm_set_ioeventfd_pio(fd, section->offset_within_address_space,
data, false, int128_get64(section->size),
match_data);
if (r < 0) {
abort();
}
}
void kvm_memory_listener_register(KVMState *s, KVMMemoryListener *kml,
AddressSpace *as, int as_id)
{
int i;
kml->slots = g_malloc0(s->nr_slots * sizeof(KVMSlot));
kml->as_id = as_id;
for (i = 0; i < s->nr_slots; i++) {
kml->slots[i].slot = i;
}
kml->listener.region_add = kvm_region_add;
kml->listener.region_del = kvm_region_del;
kml->listener.log_start = kvm_log_start;
kml->listener.log_stop = kvm_log_stop;
kml->listener.log_sync = kvm_log_sync;
kml->listener.priority = 10;
memory_listener_register(&kml->listener, as);
}
static MemoryListener kvm_io_listener = {
.eventfd_add = kvm_io_ioeventfd_add,
.eventfd_del = kvm_io_ioeventfd_del,
.priority = 10,
};
static void kvm_handle_interrupt(CPUState *cpu, int mask)
{
cpu->interrupt_request |= mask;
if (!qemu_cpu_is_self(cpu)) {
qemu_cpu_kick(cpu);
}
}
int kvm_set_irq(KVMState *s, int irq, int level)
{
struct kvm_irq_level event;
int ret;
assert(kvm_async_interrupts_enabled());
event.level = level;
event.irq = irq;
ret = kvm_vm_ioctl(s, s->irq_set_ioctl, &event);
if (ret < 0) {
perror("kvm_set_irq");
abort();
}
return (s->irq_set_ioctl == KVM_IRQ_LINE) ? 1 : event.status;
}
#ifdef KVM_CAP_IRQ_ROUTING
typedef struct KVMMSIRoute {
struct kvm_irq_routing_entry kroute;
QTAILQ_ENTRY(KVMMSIRoute) entry;
} KVMMSIRoute;
static void set_gsi(KVMState *s, unsigned int gsi)
{
set_bit(gsi, s->used_gsi_bitmap);
}
static void clear_gsi(KVMState *s, unsigned int gsi)
{
clear_bit(gsi, s->used_gsi_bitmap);
}
void kvm_init_irq_routing(KVMState *s)
{
int gsi_count, i;
gsi_count = kvm_check_extension(s, KVM_CAP_IRQ_ROUTING) - 1;
if (gsi_count > 0) {
/* Round up so we can search ints using ffs */
s->used_gsi_bitmap = bitmap_new(gsi_count);
s->gsi_count = gsi_count;
}
s->irq_routes = g_malloc0(sizeof(*s->irq_routes));
s->nr_allocated_irq_routes = 0;
if (!kvm_direct_msi_allowed) {
for (i = 0; i < KVM_MSI_HASHTAB_SIZE; i++) {
QTAILQ_INIT(&s->msi_hashtab[i]);
}
}
kvm_arch_init_irq_routing(s);
}
void kvm_irqchip_commit_routes(KVMState *s)
{
int ret;
s->irq_routes->flags = 0;
ret = kvm_vm_ioctl(s, KVM_SET_GSI_ROUTING, s->irq_routes);
assert(ret == 0);
}
static void kvm_add_routing_entry(KVMState *s,
struct kvm_irq_routing_entry *entry)
{
struct kvm_irq_routing_entry *new;
int n, size;
if (s->irq_routes->nr == s->nr_allocated_irq_routes) {
n = s->nr_allocated_irq_routes * 2;
if (n < 64) {
n = 64;
}
size = sizeof(struct kvm_irq_routing);
size += n * sizeof(*new);
s->irq_routes = g_realloc(s->irq_routes, size);
s->nr_allocated_irq_routes = n;
}
n = s->irq_routes->nr++;
new = &s->irq_routes->entries[n];
*new = *entry;
set_gsi(s, entry->gsi);
}
static int kvm_update_routing_entry(KVMState *s,
struct kvm_irq_routing_entry *new_entry)
{
struct kvm_irq_routing_entry *entry;
int n;
for (n = 0; n < s->irq_routes->nr; n++) {
entry = &s->irq_routes->entries[n];
if (entry->gsi != new_entry->gsi) {
continue;
}
if(!memcmp(entry, new_entry, sizeof *entry)) {
return 0;
}
*entry = *new_entry;
kvm_irqchip_commit_routes(s);
return 0;
}
return -ESRCH;
}
void kvm_irqchip_add_irq_route(KVMState *s, int irq, int irqchip, int pin)
{
struct kvm_irq_routing_entry e = {};
assert(pin < s->gsi_count);
e.gsi = irq;
e.type = KVM_IRQ_ROUTING_IRQCHIP;
e.flags = 0;
e.u.irqchip.irqchip = irqchip;
e.u.irqchip.pin = pin;
kvm_add_routing_entry(s, &e);
}
void kvm_irqchip_release_virq(KVMState *s, int virq)
{
struct kvm_irq_routing_entry *e;
int i;
if (kvm_gsi_direct_mapping()) {
return;
}
for (i = 0; i < s->irq_routes->nr; i++) {
e = &s->irq_routes->entries[i];
if (e->gsi == virq) {
s->irq_routes->nr--;
*e = s->irq_routes->entries[s->irq_routes->nr];
}
}
clear_gsi(s, virq);
}
static unsigned int kvm_hash_msi(uint32_t data)
{
/* This is optimized for IA32 MSI layout. However, no other arch shall
* repeat the mistake of not providing a direct MSI injection API. */
return data & 0xff;
}
static void kvm_flush_dynamic_msi_routes(KVMState *s)
{
KVMMSIRoute *route, *next;
unsigned int hash;
for (hash = 0; hash < KVM_MSI_HASHTAB_SIZE; hash++) {
QTAILQ_FOREACH_SAFE(route, &s->msi_hashtab[hash], entry, next) {
kvm_irqchip_release_virq(s, route->kroute.gsi);
QTAILQ_REMOVE(&s->msi_hashtab[hash], route, entry);
g_free(route);
}
}
}
static int kvm_irqchip_get_virq(KVMState *s)
{
int next_virq;
/*
* PIC and IOAPIC share the first 16 GSI numbers, thus the available
* GSI numbers are more than the number of IRQ route. Allocating a GSI
* number can succeed even though a new route entry cannot be added.
* When this happens, flush dynamic MSI entries to free IRQ route entries.
*/
if (!kvm_direct_msi_allowed && s->irq_routes->nr == s->gsi_count) {
kvm_flush_dynamic_msi_routes(s);
}
/* Return the lowest unused GSI in the bitmap */
next_virq = find_first_zero_bit(s->used_gsi_bitmap, s->gsi_count);
if (next_virq >= s->gsi_count) {
return -ENOSPC;
} else {
return next_virq;
}
}
static KVMMSIRoute *kvm_lookup_msi_route(KVMState *s, MSIMessage msg)
{
unsigned int hash = kvm_hash_msi(msg.data);
KVMMSIRoute *route;
QTAILQ_FOREACH(route, &s->msi_hashtab[hash], entry) {
if (route->kroute.u.msi.address_lo == (uint32_t)msg.address &&
route->kroute.u.msi.address_hi == (msg.address >> 32) &&
route->kroute.u.msi.data == le32_to_cpu(msg.data)) {
return route;
}
}
return NULL;
}
int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
{
struct kvm_msi msi;
KVMMSIRoute *route;
if (kvm_direct_msi_allowed) {
msi.address_lo = (uint32_t)msg.address;
msi.address_hi = msg.address >> 32;
msi.data = le32_to_cpu(msg.data);
msi.flags = 0;
memset(msi.pad, 0, sizeof(msi.pad));
return kvm_vm_ioctl(s, KVM_SIGNAL_MSI, &msi);
}
route = kvm_lookup_msi_route(s, msg);
if (!route) {
int virq;
virq = kvm_irqchip_get_virq(s);
if (virq < 0) {
return virq;
}
route = g_malloc0(sizeof(KVMMSIRoute));
route->kroute.gsi = virq;
route->kroute.type = KVM_IRQ_ROUTING_MSI;
route->kroute.flags = 0;
route->kroute.u.msi.address_lo = (uint32_t)msg.address;
route->kroute.u.msi.address_hi = msg.address >> 32;
route->kroute.u.msi.data = le32_to_cpu(msg.data);
kvm_add_routing_entry(s, &route->kroute);
kvm_irqchip_commit_routes(s);
QTAILQ_INSERT_TAIL(&s->msi_hashtab[kvm_hash_msi(msg.data)], route,
entry);
}
assert(route->kroute.type == KVM_IRQ_ROUTING_MSI);
return kvm_set_irq(s, route->kroute.gsi, 1);
}
int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg, PCIDevice *dev)
{
struct kvm_irq_routing_entry kroute = {};
int virq;
if (kvm_gsi_direct_mapping()) {
return kvm_arch_msi_data_to_gsi(msg.data);
}
if (!kvm_gsi_routing_enabled()) {
return -ENOSYS;
}
virq = kvm_irqchip_get_virq(s);
if (virq < 0) {
return virq;
}
kroute.gsi = virq;
kroute.type = KVM_IRQ_ROUTING_MSI;
kroute.flags = 0;
kroute.u.msi.address_lo = (uint32_t)msg.address;
kroute.u.msi.address_hi = msg.address >> 32;
kroute.u.msi.data = le32_to_cpu(msg.data);
if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
kvm_irqchip_release_virq(s, virq);
return -EINVAL;
}
kvm_add_routing_entry(s, &kroute);
kvm_irqchip_commit_routes(s);
return virq;
}
int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg,
PCIDevice *dev)
{
struct kvm_irq_routing_entry kroute = {};
if (kvm_gsi_direct_mapping()) {
return 0;
}
if (!kvm_irqchip_in_kernel()) {
return -ENOSYS;
}
kroute.gsi = virq;
kroute.type = KVM_IRQ_ROUTING_MSI;
kroute.flags = 0;
kroute.u.msi.address_lo = (uint32_t)msg.address;
kroute.u.msi.address_hi = msg.address >> 32;
kroute.u.msi.data = le32_to_cpu(msg.data);
if (kvm_arch_fixup_msi_route(&kroute, msg.address, msg.data, dev)) {
return -EINVAL;
}
return kvm_update_routing_entry(s, &kroute);
}
static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int rfd, int virq,
bool assign)
{
struct kvm_irqfd irqfd = {
.fd = fd,
.gsi = virq,
.flags = assign ? 0 : KVM_IRQFD_FLAG_DEASSIGN,
};
if (rfd != -1) {
irqfd.flags |= KVM_IRQFD_FLAG_RESAMPLE;
irqfd.resamplefd = rfd;
}
if (!kvm_irqfds_enabled()) {
return -ENOSYS;
}
return kvm_vm_ioctl(s, KVM_IRQFD, &irqfd);
}
int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
{
struct kvm_irq_routing_entry kroute = {};
int virq;
if (!kvm_gsi_routing_enabled()) {
return -ENOSYS;
}
virq = kvm_irqchip_get_virq(s);
if (virq < 0) {
return virq;
}
kroute.gsi = virq;
kroute.type = KVM_IRQ_ROUTING_S390_ADAPTER;
kroute.flags = 0;
kroute.u.adapter.summary_addr = adapter->summary_addr;
kroute.u.adapter.ind_addr = adapter->ind_addr;
kroute.u.adapter.summary_offset = adapter->summary_offset;
kroute.u.adapter.ind_offset = adapter->ind_offset;
kroute.u.adapter.adapter_id = adapter->adapter_id;
kvm_add_routing_entry(s, &kroute);
return virq;
}
int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
{
struct kvm_irq_routing_entry kroute = {};
int virq;
if (!kvm_gsi_routing_enabled()) {
return -ENOSYS;
}
if (!kvm_check_extension(s, KVM_CAP_HYPERV_SYNIC)) {
return -ENOSYS;
}
virq = kvm_irqchip_get_virq(s);
if (virq < 0) {
return virq;
}
kroute.gsi = virq;
kroute.type = KVM_IRQ_ROUTING_HV_SINT;
kroute.flags = 0;
kroute.u.hv_sint.vcpu = vcpu;
kroute.u.hv_sint.sint = sint;
kvm_add_routing_entry(s, &kroute);
kvm_irqchip_commit_routes(s);
return virq;
}
#else /* !KVM_CAP_IRQ_ROUTING */
void kvm_init_irq_routing(KVMState *s)
{
}
void kvm_irqchip_release_virq(KVMState *s, int virq)
{
}
int kvm_irqchip_send_msi(KVMState *s, MSIMessage msg)
{
abort();
}
int kvm_irqchip_add_msi_route(KVMState *s, MSIMessage msg)
{
return -ENOSYS;
}
int kvm_irqchip_add_adapter_route(KVMState *s, AdapterInfo *adapter)
{
return -ENOSYS;
}
int kvm_irqchip_add_hv_sint_route(KVMState *s, uint32_t vcpu, uint32_t sint)
{
return -ENOSYS;
}
static int kvm_irqchip_assign_irqfd(KVMState *s, int fd, int virq, bool assign)
{
abort();
}
int kvm_irqchip_update_msi_route(KVMState *s, int virq, MSIMessage msg)
{
return -ENOSYS;
}
#endif /* !KVM_CAP_IRQ_ROUTING */
int kvm_irqchip_add_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
EventNotifier *rn, int virq)
{
return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n),
rn ? event_notifier_get_fd(rn) : -1, virq, true);
}
int kvm_irqchip_remove_irqfd_notifier_gsi(KVMState *s, EventNotifier *n,
int virq)
{
return kvm_irqchip_assign_irqfd(s, event_notifier_get_fd(n), -1, virq,
false);
}
int kvm_irqchip_add_irqfd_notifier(KVMState *s, EventNotifier *n,
EventNotifier *rn, qemu_irq irq)
{
gpointer key, gsi;
gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
if (!found) {
return -ENXIO;
}
return kvm_irqchip_add_irqfd_notifier_gsi(s, n, rn, GPOINTER_TO_INT(gsi));
}
int kvm_irqchip_remove_irqfd_notifier(KVMState *s, EventNotifier *n,
qemu_irq irq)
{
gpointer key, gsi;
gboolean found = g_hash_table_lookup_extended(s->gsimap, irq, &key, &gsi);
if (!found) {
return -ENXIO;
}
return kvm_irqchip_remove_irqfd_notifier_gsi(s, n, GPOINTER_TO_INT(gsi));
}
void kvm_irqchip_set_qemuirq_gsi(KVMState *s, qemu_irq irq, int gsi)
{
g_hash_table_insert(s->gsimap, irq, GINT_TO_POINTER(gsi));
}
static void kvm_irqchip_create(MachineState *machine, KVMState *s)
{
int ret;
if (kvm_check_extension(s, KVM_CAP_IRQCHIP)) {
;
} else if (kvm_check_extension(s, KVM_CAP_S390_IRQCHIP)) {
ret = kvm_vm_enable_cap(s, KVM_CAP_S390_IRQCHIP, 0);
if (ret < 0) {
fprintf(stderr, "Enable kernel irqchip failed: %s\n", strerror(-ret));
exit(1);
}
} else {
return;
}
/* First probe and see if there's a arch-specific hook to create the
* in-kernel irqchip for us */
ret = kvm_arch_irqchip_create(machine, s);
if (ret == 0) {
if (machine_kernel_irqchip_split(machine)) {
perror("Split IRQ chip mode not supported.");
exit(1);
} else {
ret = kvm_vm_ioctl(s, KVM_CREATE_IRQCHIP);
}
}
if (ret < 0) {
fprintf(stderr, "Create kernel irqchip failed: %s\n", strerror(-ret));
exit(1);
}
kvm_kernel_irqchip = true;
/* If we have an in-kernel IRQ chip then we must have asynchronous
* interrupt delivery (though the reverse is not necessarily true)
*/
kvm_async_interrupts_allowed = true;
kvm_halt_in_kernel_allowed = true;
kvm_init_irq_routing(s);
s->gsimap = g_hash_table_new(g_direct_hash, g_direct_equal);
}
/* Find number of supported CPUs using the recommended
* procedure from the kernel API documentation to cope with
* older kernels that may be missing capabilities.
*/
static int kvm_recommended_vcpus(KVMState *s)
{
int ret = kvm_check_extension(s, KVM_CAP_NR_VCPUS);
return (ret) ? ret : 4;
}
static int kvm_max_vcpus(KVMState *s)
{
int ret = kvm_check_extension(s, KVM_CAP_MAX_VCPUS);
return (ret) ? ret : kvm_recommended_vcpus(s);
}
bool kvm_vcpu_id_is_valid(int vcpu_id)
{
KVMState *s = KVM_STATE(current_machine->accelerator);
return vcpu_id >= 0 && vcpu_id < kvm_max_vcpus(s);
}
static int kvm_init(MachineState *ms)
{
MachineClass *mc = MACHINE_GET_CLASS(ms);
static const char upgrade_note[] =
"Please upgrade to at least kernel 2.6.29 or recent kvm-kmod\n"
"(see http://sourceforge.net/projects/kvm).\n";
struct {
const char *name;
int num;
} num_cpus[] = {
{ "SMP", smp_cpus },
{ "hotpluggable", max_cpus },
{ NULL, }
}, *nc = num_cpus;
int soft_vcpus_limit, hard_vcpus_limit;
KVMState *s;
const KVMCapabilityInfo *missing_cap;
int ret;
int type = 0;
const char *kvm_type;
s = KVM_STATE(ms->accelerator);
/*
* On systems where the kernel can support different base page
* sizes, host page size may be different from TARGET_PAGE_SIZE,
* even with KVM. TARGET_PAGE_SIZE is assumed to be the minimum
* page size for the system though.
*/
assert(TARGET_PAGE_SIZE <= getpagesize());
s->sigmask_len = 8;
#ifdef KVM_CAP_SET_GUEST_DEBUG
QTAILQ_INIT(&s->kvm_sw_breakpoints);
#endif
QLIST_INIT(&s->kvm_parked_vcpus);
s->vmfd = -1;
s->fd = qemu_open("/dev/kvm", O_RDWR);
if (s->fd == -1) {
fprintf(stderr, "Could not access KVM kernel module: %m\n");
ret = -errno;
goto err;
}
ret = kvm_ioctl(s, KVM_GET_API_VERSION, 0);
if (ret < KVM_API_VERSION) {
if (ret >= 0) {
ret = -EINVAL;
}
fprintf(stderr, "kvm version too old\n");
goto err;
}
if (ret > KVM_API_VERSION) {
ret = -EINVAL;
fprintf(stderr, "kvm version not supported\n");
goto err;
}
s->nr_slots = kvm_check_extension(s, KVM_CAP_NR_MEMSLOTS);
/* If unspecified, use the default value */
if (!s->nr_slots) {
s->nr_slots = 32;
}
/* check the vcpu limits */
soft_vcpus_limit = kvm_recommended_vcpus(s);
hard_vcpus_limit = kvm_max_vcpus(s);
while (nc->name) {
if (nc->num > soft_vcpus_limit) {
fprintf(stderr,
"Warning: Number of %s cpus requested (%d) exceeds "
"the recommended cpus supported by KVM (%d)\n",
nc->name, nc->num, soft_vcpus_limit);
if (nc->num > hard_vcpus_limit) {
fprintf(stderr, "Number of %s cpus requested (%d) exceeds "
"the maximum cpus supported by KVM (%d)\n",
nc->name, nc->num, hard_vcpus_limit);
exit(1);
}
}
nc++;
}
kvm_type = qemu_opt_get(qemu_get_machine_opts(), "kvm-type");
if (mc->kvm_type) {
type = mc->kvm_type(kvm_type);
} else if (kvm_type) {
ret = -EINVAL;
fprintf(stderr, "Invalid argument kvm-type=%s\n", kvm_type);
goto err;
}
do {
ret = kvm_ioctl(s, KVM_CREATE_VM, type);
} while (ret == -EINTR);
if (ret < 0) {
fprintf(stderr, "ioctl(KVM_CREATE_VM) failed: %d %s\n", -ret,
strerror(-ret));
#ifdef TARGET_S390X
if (ret == -EINVAL) {
fprintf(stderr,
"Host kernel setup problem detected. Please verify:\n");
fprintf(stderr, "- for kernels supporting the switch_amode or"
" user_mode parameters, whether\n");
fprintf(stderr,
" user space is running in primary address space\n");
fprintf(stderr,
"- for kernels supporting the vm.allocate_pgste sysctl, "
"whether it is enabled\n");
}
#endif
goto err;
}
s->vmfd = ret;
missing_cap = kvm_check_extension_list(s, kvm_required_capabilites);
if (!missing_cap) {
missing_cap =
kvm_check_extension_list(s, kvm_arch_required_capabilities);
}
if (missing_cap) {
ret = -EINVAL;
fprintf(stderr, "kvm does not support %s\n%s",
missing_cap->name, upgrade_note);
goto err;
}
s->coalesced_mmio = kvm_check_extension(s, KVM_CAP_COALESCED_MMIO);
s->broken_set_mem_region = 1;
ret = kvm_check_extension(s, KVM_CAP_JOIN_MEMORY_REGIONS_WORKS);
if (ret > 0) {
s->broken_set_mem_region = 0;
}
#ifdef KVM_CAP_VCPU_EVENTS
s->vcpu_events = kvm_check_extension(s, KVM_CAP_VCPU_EVENTS);
#endif
s->robust_singlestep =
kvm_check_extension(s, KVM_CAP_X86_ROBUST_SINGLESTEP);
#ifdef KVM_CAP_DEBUGREGS
s->debugregs = kvm_check_extension(s, KVM_CAP_DEBUGREGS);
#endif
#ifdef KVM_CAP_IRQ_ROUTING
kvm_direct_msi_allowed = (kvm_check_extension(s, KVM_CAP_SIGNAL_MSI) > 0);
#endif
s->intx_set_mask = kvm_check_extension(s, KVM_CAP_PCI_2_3);
s->irq_set_ioctl = KVM_IRQ_LINE;
if (kvm_check_extension(s, KVM_CAP_IRQ_INJECT_STATUS)) {
s->irq_set_ioctl = KVM_IRQ_LINE_STATUS;
}
#ifdef KVM_CAP_READONLY_MEM
kvm_readonly_mem_allowed =
(kvm_check_extension(s, KVM_CAP_READONLY_MEM) > 0);
#endif
kvm_eventfds_allowed =
(kvm_check_extension(s, KVM_CAP_IOEVENTFD) > 0);
kvm_irqfds_allowed =
(kvm_check_extension(s, KVM_CAP_IRQFD) > 0);
kvm_resamplefds_allowed =
(kvm_check_extension(s, KVM_CAP_IRQFD_RESAMPLE) > 0);
kvm_vm_attributes_allowed =
(kvm_check_extension(s, KVM_CAP_VM_ATTRIBUTES) > 0);
kvm_ioeventfd_any_length_allowed =
(kvm_check_extension(s, KVM_CAP_IOEVENTFD_ANY_LENGTH) > 0);
ret = kvm_arch_init(ms, s);
if (ret < 0) {
goto err;
}
if (machine_kernel_irqchip_allowed(ms)) {
kvm_irqchip_create(ms, s);
}
kvm_state = s;
if (kvm_eventfds_allowed) {
s->memory_listener.listener.eventfd_add = kvm_mem_ioeventfd_add;
s->memory_listener.listener.eventfd_del = kvm_mem_ioeventfd_del;
}
s->memory_listener.listener.coalesced_mmio_add = kvm_coalesce_mmio_region;
s->memory_listener.listener.coalesced_mmio_del = kvm_uncoalesce_mmio_region;
kvm_memory_listener_register(s, &s->memory_listener,
&address_space_memory, 0);
memory_listener_register(&kvm_io_listener,
&address_space_io);
s->many_ioeventfds = kvm_check_many_ioeventfds();
cpu_interrupt_handler = kvm_handle_interrupt;
return 0;
err:
assert(ret < 0);
if (s->vmfd >= 0) {
close(s->vmfd);
}
if (s->fd != -1) {
close(s->fd);
}
g_free(s->memory_listener.slots);
return ret;
}
void kvm_set_sigmask_len(KVMState *s, unsigned int sigmask_len)
{
s->sigmask_len = sigmask_len;
}
static void kvm_handle_io(uint16_t port, MemTxAttrs attrs, void *data, int direction,
int size, uint32_t count)
{
int i;
uint8_t *ptr = data;
for (i = 0; i < count; i++) {
address_space_rw(&address_space_io, port, attrs,
ptr, size,
direction == KVM_EXIT_IO_OUT);
ptr += size;
}
}
static int kvm_handle_internal_error(CPUState *cpu, struct kvm_run *run)
{
fprintf(stderr, "KVM internal error. Suberror: %d\n",
run->internal.suberror);
if (kvm_check_extension(kvm_state, KVM_CAP_INTERNAL_ERROR_DATA)) {
int i;
for (i = 0; i < run->internal.ndata; ++i) {
fprintf(stderr, "extra data[%d]: %"PRIx64"\n",
i, (uint64_t)run->internal.data[i]);
}
}
if (run->internal.suberror == KVM_INTERNAL_ERROR_EMULATION) {
fprintf(stderr, "emulation failure\n");
if (!kvm_arch_stop_on_emulation_error(cpu)) {
cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE);
return EXCP_INTERRUPT;
}
}
/* FIXME: Should trigger a qmp message to let management know
* something went wrong.
*/
return -1;
}
void kvm_flush_coalesced_mmio_buffer(void)
{
KVMState *s = kvm_state;
if (s->coalesced_flush_in_progress) {
return;
}
s->coalesced_flush_in_progress = true;
if (s->coalesced_mmio_ring) {
struct kvm_coalesced_mmio_ring *ring = s->coalesced_mmio_ring;
while (ring->first != ring->last) {
struct kvm_coalesced_mmio *ent;
ent = &ring->coalesced_mmio[ring->first];
cpu_physical_memory_write(ent->phys_addr, ent->data, ent->len);
smp_wmb();
ring->first = (ring->first + 1) % KVM_COALESCED_MMIO_MAX;
}
}
s->coalesced_flush_in_progress = false;
}
static void do_kvm_cpu_synchronize_state(void *arg)
{
CPUState *cpu = arg;
if (!cpu->kvm_vcpu_dirty) {
kvm_arch_get_registers(cpu);
cpu->kvm_vcpu_dirty = true;
}
}
void kvm_cpu_synchronize_state(CPUState *cpu)
{
if (!cpu->kvm_vcpu_dirty) {
run_on_cpu(cpu, do_kvm_cpu_synchronize_state, cpu);
}
}
static void do_kvm_cpu_synchronize_post_reset(void *arg)
{
CPUState *cpu = arg;
kvm_arch_put_registers(cpu, KVM_PUT_RESET_STATE);
cpu->kvm_vcpu_dirty = false;
}
void kvm_cpu_synchronize_post_reset(CPUState *cpu)
{
run_on_cpu(cpu, do_kvm_cpu_synchronize_post_reset, cpu);
}
static void do_kvm_cpu_synchronize_post_init(void *arg)
{
CPUState *cpu = arg;
kvm_arch_put_registers(cpu, KVM_PUT_FULL_STATE);
cpu->kvm_vcpu_dirty = false;
}
void kvm_cpu_synchronize_post_init(CPUState *cpu)
{
run_on_cpu(cpu, do_kvm_cpu_synchronize_post_init, cpu);
}
int kvm_cpu_exec(CPUState *cpu)
{
struct kvm_run *run = cpu->kvm_run;
int ret, run_ret;
DPRINTF("kvm_cpu_exec()\n");
if (kvm_arch_process_async_events(cpu)) {
cpu->exit_request = 0;
return EXCP_HLT;
}
qemu_mutex_unlock_iothread();
do {
MemTxAttrs attrs;
if (cpu->kvm_vcpu_dirty) {
kvm_arch_put_registers(cpu, KVM_PUT_RUNTIME_STATE);
cpu->kvm_vcpu_dirty = false;
}
kvm_arch_pre_run(cpu, run);
if (cpu->exit_request) {
DPRINTF("interrupt exit requested\n");
/*
* KVM requires us to reenter the kernel after IO exits to complete
* instruction emulation. This self-signal will ensure that we
* leave ASAP again.
*/
qemu_cpu_kick_self();
}
run_ret = kvm_vcpu_ioctl(cpu, KVM_RUN, 0);
attrs = kvm_arch_post_run(cpu, run);
if (run_ret < 0) {
if (run_ret == -EINTR || run_ret == -EAGAIN) {
DPRINTF("io window exit\n");
ret = EXCP_INTERRUPT;
break;
}
fprintf(stderr, "error: kvm run failed %s\n",
strerror(-run_ret));
#ifdef TARGET_PPC
if (run_ret == -EBUSY) {
fprintf(stderr,
"This is probably because your SMT is enabled.\n"
"VCPU can only run on primary threads with all "
"secondary threads offline.\n");
}
#endif
ret = -1;
break;
}
trace_kvm_run_exit(cpu->cpu_index, run->exit_reason);
switch (run->exit_reason) {
case KVM_EXIT_IO:
DPRINTF("handle_io\n");
/* Called outside BQL */
kvm_handle_io(run->io.port, attrs,
(uint8_t *)run + run->io.data_offset,
run->io.direction,
run->io.size,
run->io.count);
ret = 0;
break;
case KVM_EXIT_MMIO:
DPRINTF("handle_mmio\n");
/* Called outside BQL */
address_space_rw(&address_space_memory,
run->mmio.phys_addr, attrs,
run->mmio.data,
run->mmio.len,
run->mmio.is_write);
ret = 0;
break;
case KVM_EXIT_IRQ_WINDOW_OPEN:
DPRINTF("irq_window_open\n");
ret = EXCP_INTERRUPT;
break;
case KVM_EXIT_SHUTDOWN:
DPRINTF("shutdown\n");
qemu_system_reset_request();
ret = EXCP_INTERRUPT;
break;
case KVM_EXIT_UNKNOWN:
fprintf(stderr, "KVM: unknown exit, hardware reason %" PRIx64 "\n",
(uint64_t)run->hw.hardware_exit_reason);
ret = -1;
break;
case KVM_EXIT_INTERNAL_ERROR:
ret = kvm_handle_internal_error(cpu, run);
break;
case KVM_EXIT_SYSTEM_EVENT:
switch (run->system_event.type) {
case KVM_SYSTEM_EVENT_SHUTDOWN:
qemu_system_shutdown_request();
ret = EXCP_INTERRUPT;
break;
case KVM_SYSTEM_EVENT_RESET:
qemu_system_reset_request();
ret = EXCP_INTERRUPT;
break;
case KVM_SYSTEM_EVENT_CRASH:
qemu_mutex_lock_iothread();
qemu_system_guest_panicked();
qemu_mutex_unlock_iothread();
ret = 0;
break;
default:
DPRINTF("kvm_arch_handle_exit\n");
ret = kvm_arch_handle_exit(cpu, run);
break;
}
break;
default:
DPRINTF("kvm_arch_handle_exit\n");
ret = kvm_arch_handle_exit(cpu, run);
break;
}
} while (ret == 0);
qemu_mutex_lock_iothread();
if (ret < 0) {
cpu_dump_state(cpu, stderr, fprintf, CPU_DUMP_CODE);
vm_stop(RUN_STATE_INTERNAL_ERROR);
}
cpu->exit_request = 0;
return ret;
}
int kvm_ioctl(KVMState *s, int type, ...)
{
int ret;
void *arg;
va_list ap;
va_start(ap, type);
arg = va_arg(ap, void *);
va_end(ap);
trace_kvm_ioctl(type, arg);
ret = ioctl(s->fd, type, arg);
if (ret == -1) {
ret = -errno;
}
return ret;
}
int kvm_vm_ioctl(KVMState *s, int type, ...)
{
int ret;
void *arg;
va_list ap;
va_start(ap, type);
arg = va_arg(ap, void *);
va_end(ap);
trace_kvm_vm_ioctl(type, arg);
ret = ioctl(s->vmfd, type, arg);
if (ret == -1) {
ret = -errno;
}
return ret;
}
int kvm_vcpu_ioctl(CPUState *cpu, int type, ...)
{
int ret;
void *arg;
va_list ap;
va_start(ap, type);
arg = va_arg(ap, void *);
va_end(ap);
trace_kvm_vcpu_ioctl(cpu->cpu_index, type, arg);
ret = ioctl(cpu->kvm_fd, type, arg);
if (ret == -1) {
ret = -errno;
}
return ret;
}
int kvm_device_ioctl(int fd, int type, ...)
{
int ret;
void *arg;
va_list ap;
va_start(ap, type);
arg = va_arg(ap, void *);
va_end(ap);
trace_kvm_device_ioctl(fd, type, arg);
ret = ioctl(fd, type, arg);
if (ret == -1) {
ret = -errno;
}
return ret;
}
int kvm_vm_check_attr(KVMState *s, uint32_t group, uint64_t attr)
{
int ret;
struct kvm_device_attr attribute = {
.group = group,
.attr = attr,
};
if (!kvm_vm_attributes_allowed) {
return 0;
}
ret = kvm_vm_ioctl(s, KVM_HAS_DEVICE_ATTR, &attribute);
/* kvm returns 0 on success for HAS_DEVICE_ATTR */
return ret ? 0 : 1;
}
int kvm_device_check_attr(int dev_fd, uint32_t group, uint64_t attr)
{
struct kvm_device_attr attribute = {
.group = group,
.attr = attr,
.flags = 0,
};
return kvm_device_ioctl(dev_fd, KVM_HAS_DEVICE_ATTR, &attribute) ? 0 : 1;
}
void kvm_device_access(int fd, int group, uint64_t attr,
void *val, bool write)
{
struct kvm_device_attr kvmattr;
int err;
kvmattr.flags = 0;
kvmattr.group = group;
kvmattr.attr = attr;
kvmattr.addr = (uintptr_t)val;
err = kvm_device_ioctl(fd,
write ? KVM_SET_DEVICE_ATTR : KVM_GET_DEVICE_ATTR,
&kvmattr);
if (err < 0) {
error_report("KVM_%s_DEVICE_ATTR failed: %s",
write ? "SET" : "GET", strerror(-err));
error_printf("Group %d attr 0x%016" PRIx64, group, attr);
abort();
}
}
int kvm_has_sync_mmu(void)
{
return kvm_check_extension(kvm_state, KVM_CAP_SYNC_MMU);
}
int kvm_has_vcpu_events(void)
{
return kvm_state->vcpu_events;
}
int kvm_has_robust_singlestep(void)
{
return kvm_state->robust_singlestep;
}
int kvm_has_debugregs(void)
{
return kvm_state->debugregs;
}
int kvm_has_many_ioeventfds(void)
{
if (!kvm_enabled()) {
return 0;
}
return kvm_state->many_ioeventfds;
}
int kvm_has_gsi_routing(void)
{
#ifdef KVM_CAP_IRQ_ROUTING
return kvm_check_extension(kvm_state, KVM_CAP_IRQ_ROUTING);
#else
return false;
#endif
}
int kvm_has_intx_set_mask(void)
{
return kvm_state->intx_set_mask;
}
void kvm_setup_guest_memory(void *start, size_t size)
{
if (!kvm_has_sync_mmu()) {
int ret = qemu_madvise(start, size, QEMU_MADV_DONTFORK);
if (ret) {
perror("qemu_madvise");
fprintf(stderr,
"Need MADV_DONTFORK in absence of synchronous KVM MMU\n");
exit(1);
}
}
}
#ifdef KVM_CAP_SET_GUEST_DEBUG
struct kvm_sw_breakpoint *kvm_find_sw_breakpoint(CPUState *cpu,
target_ulong pc)
{
struct kvm_sw_breakpoint *bp;
QTAILQ_FOREACH(bp, &cpu->kvm_state->kvm_sw_breakpoints, entry) {
if (bp->pc == pc) {
return bp;
}
}
return NULL;
}
int kvm_sw_breakpoints_active(CPUState *cpu)
{
return !QTAILQ_EMPTY(&cpu->kvm_state->kvm_sw_breakpoints);
}
struct kvm_set_guest_debug_data {
struct kvm_guest_debug dbg;
CPUState *cpu;
int err;
};
static void kvm_invoke_set_guest_debug(void *data)
{
struct kvm_set_guest_debug_data *dbg_data = data;
dbg_data->err = kvm_vcpu_ioctl(dbg_data->cpu, KVM_SET_GUEST_DEBUG,
&dbg_data->dbg);
}
int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
{
struct kvm_set_guest_debug_data data;
data.dbg.control = reinject_trap;
if (cpu->singlestep_enabled) {
data.dbg.control |= KVM_GUESTDBG_ENABLE | KVM_GUESTDBG_SINGLESTEP;
}
kvm_arch_update_guest_debug(cpu, &data.dbg);
data.cpu = cpu;
run_on_cpu(cpu, kvm_invoke_set_guest_debug, &data);
return data.err;
}
int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
target_ulong len, int type)
{
struct kvm_sw_breakpoint *bp;
int err;
if (type == GDB_BREAKPOINT_SW) {
bp = kvm_find_sw_breakpoint(cpu, addr);
if (bp) {
bp->use_count++;
return 0;
}
bp = g_malloc(sizeof(struct kvm_sw_breakpoint));
bp->pc = addr;
bp->use_count = 1;
err = kvm_arch_insert_sw_breakpoint(cpu, bp);
if (err) {
g_free(bp);
return err;
}
QTAILQ_INSERT_HEAD(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
} else {
err = kvm_arch_insert_hw_breakpoint(addr, len, type);
if (err) {
return err;
}
}
CPU_FOREACH(cpu) {
err = kvm_update_guest_debug(cpu, 0);
if (err) {
return err;
}
}
return 0;
}
int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
target_ulong len, int type)
{
struct kvm_sw_breakpoint *bp;
int err;
if (type == GDB_BREAKPOINT_SW) {
bp = kvm_find_sw_breakpoint(cpu, addr);
if (!bp) {
return -ENOENT;
}
if (bp->use_count > 1) {
bp->use_count--;
return 0;
}
err = kvm_arch_remove_sw_breakpoint(cpu, bp);
if (err) {
return err;
}
QTAILQ_REMOVE(&cpu->kvm_state->kvm_sw_breakpoints, bp, entry);
g_free(bp);
} else {
err = kvm_arch_remove_hw_breakpoint(addr, len, type);
if (err) {
return err;
}
}
CPU_FOREACH(cpu) {
err = kvm_update_guest_debug(cpu, 0);
if (err) {
return err;
}
}
return 0;
}
void kvm_remove_all_breakpoints(CPUState *cpu)
{
struct kvm_sw_breakpoint *bp, *next;
KVMState *s = cpu->kvm_state;
CPUState *tmpcpu;
QTAILQ_FOREACH_SAFE(bp, &s->kvm_sw_breakpoints, entry, next) {
if (kvm_arch_remove_sw_breakpoint(cpu, bp) != 0) {
/* Try harder to find a CPU that currently sees the breakpoint. */
CPU_FOREACH(tmpcpu) {
if (kvm_arch_remove_sw_breakpoint(tmpcpu, bp) == 0) {
break;
}
}
}
QTAILQ_REMOVE(&s->kvm_sw_breakpoints, bp, entry);
g_free(bp);
}
kvm_arch_remove_all_hw_breakpoints();
CPU_FOREACH(cpu) {
kvm_update_guest_debug(cpu, 0);
}
}
#else /* !KVM_CAP_SET_GUEST_DEBUG */
int kvm_update_guest_debug(CPUState *cpu, unsigned long reinject_trap)
{
return -EINVAL;
}
int kvm_insert_breakpoint(CPUState *cpu, target_ulong addr,
target_ulong len, int type)
{
return -EINVAL;
}
int kvm_remove_breakpoint(CPUState *cpu, target_ulong addr,
target_ulong len, int type)
{
return -EINVAL;
}
void kvm_remove_all_breakpoints(CPUState *cpu)
{
}
#endif /* !KVM_CAP_SET_GUEST_DEBUG */
int kvm_set_signal_mask(CPUState *cpu, const sigset_t *sigset)
{
KVMState *s = kvm_state;
struct kvm_signal_mask *sigmask;
int r;
if (!sigset) {
return kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, NULL);
}
sigmask = g_malloc(sizeof(*sigmask) + sizeof(*sigset));
sigmask->len = s->sigmask_len;
memcpy(sigmask->sigset, sigset, sizeof(*sigset));
r = kvm_vcpu_ioctl(cpu, KVM_SET_SIGNAL_MASK, sigmask);
g_free(sigmask);
return r;
}
int kvm_on_sigbus_vcpu(CPUState *cpu, int code, void *addr)
{
return kvm_arch_on_sigbus_vcpu(cpu, code, addr);
}
int kvm_on_sigbus(int code, void *addr)
{
return kvm_arch_on_sigbus(code, addr);
}
int kvm_create_device(KVMState *s, uint64_t type, bool test)
{
int ret;
struct kvm_create_device create_dev;
create_dev.type = type;
create_dev.fd = -1;
create_dev.flags = test ? KVM_CREATE_DEVICE_TEST : 0;
if (!kvm_check_extension(s, KVM_CAP_DEVICE_CTRL)) {
return -ENOTSUP;
}
ret = kvm_vm_ioctl(s, KVM_CREATE_DEVICE, &create_dev);
if (ret) {
return ret;
}
return test ? 0 : create_dev.fd;
}
bool kvm_device_supported(int vmfd, uint64_t type)
{
struct kvm_create_device create_dev = {
.type = type,
.fd = -1,
.flags = KVM_CREATE_DEVICE_TEST,
};
if (ioctl(vmfd, KVM_CHECK_EXTENSION, KVM_CAP_DEVICE_CTRL) <= 0) {
return false;
}
return (ioctl(vmfd, KVM_CREATE_DEVICE, &create_dev) >= 0);
}
int kvm_set_one_reg(CPUState *cs, uint64_t id, void *source)
{
struct kvm_one_reg reg;
int r;
reg.id = id;
reg.addr = (uintptr_t) source;
r = kvm_vcpu_ioctl(cs, KVM_SET_ONE_REG, &reg);
if (r) {
trace_kvm_failed_reg_set(id, strerror(-r));
}
return r;
}
int kvm_get_one_reg(CPUState *cs, uint64_t id, void *target)
{
struct kvm_one_reg reg;
int r;
reg.id = id;
reg.addr = (uintptr_t) target;
r = kvm_vcpu_ioctl(cs, KVM_GET_ONE_REG, &reg);
if (r) {
trace_kvm_failed_reg_get(id, strerror(-r));
}
return r;
}
static void kvm_accel_class_init(ObjectClass *oc, void *data)
{
AccelClass *ac = ACCEL_CLASS(oc);
ac->name = "KVM";
ac->init_machine = kvm_init;
ac->allowed = &kvm_allowed;
}
static const TypeInfo kvm_accel_type = {
.name = TYPE_KVM_ACCEL,
.parent = TYPE_ACCEL,
.class_init = kvm_accel_class_init,
.instance_size = sizeof(KVMState),
};
static void kvm_type_init(void)
{
type_register_static(&kvm_accel_type);
}
type_init(kvm_type_init);
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