xen: Introduce VGA sync dirty bitmap support
This patch introduces phys memory client for Xen. Only sync dirty_bitmap and set_memory are actually implemented. migration_log will stay empty for the moment. Xen can only log one range for bit change, so only the range in the first call will be synced. Signed-off-by: Anthony PERARD <anthony.perard@citrix.com> Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Anthony PERARD
Alexander Graf
parent
b87de24e6c
commit
b4dd7802ca
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@ -396,6 +396,7 @@ disable milkymist_vgafb_memory_write(uint32_t addr, uint32_t value) "addr %08x v
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# xen-all.c
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disable xen_ram_alloc(unsigned long ram_addr, unsigned long size) "requested: %#lx, size %#lx"
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disable xen_client_set_memory(uint64_t start_addr, unsigned long size, unsigned long phys_offset, bool log_dirty) "%#"PRIx64" size %#lx, offset %#lx, log_dirty %i"
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# xen-mapcache.c
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disable qemu_map_cache(uint64_t phys_addr) "want %#"PRIx64""
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267
xen-all.c
267
xen-all.c
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@ -13,6 +13,7 @@
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#include "hw/xen_common.h"
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#include "hw/xen_backend.h"
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#include "range.h"
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#include "xen-mapcache.h"
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#include "trace.h"
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@ -54,6 +55,14 @@ static inline ioreq_t *xen_vcpu_ioreq(shared_iopage_t *shared_page, int vcpu)
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#define BUFFER_IO_MAX_DELAY 100
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typedef struct XenPhysmap {
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target_phys_addr_t start_addr;
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ram_addr_t size;
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target_phys_addr_t phys_offset;
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QLIST_ENTRY(XenPhysmap) list;
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} XenPhysmap;
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typedef struct XenIOState {
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shared_iopage_t *shared_page;
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buffered_iopage_t *buffered_io_page;
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@ -66,6 +75,9 @@ typedef struct XenIOState {
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int send_vcpu;
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struct xs_handle *xenstore;
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CPUPhysMemoryClient client;
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QLIST_HEAD(, XenPhysmap) physmap;
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const XenPhysmap *log_for_dirtybit;
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Notifier exit;
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} XenIOState;
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@ -178,6 +190,256 @@ void xen_ram_alloc(ram_addr_t ram_addr, ram_addr_t size)
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qemu_free(pfn_list);
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}
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static XenPhysmap *get_physmapping(XenIOState *state,
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target_phys_addr_t start_addr, ram_addr_t size)
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{
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XenPhysmap *physmap = NULL;
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start_addr &= TARGET_PAGE_MASK;
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QLIST_FOREACH(physmap, &state->physmap, list) {
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if (range_covers_byte(physmap->start_addr, physmap->size, start_addr)) {
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return physmap;
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}
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}
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return NULL;
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}
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#if CONFIG_XEN_CTRL_INTERFACE_VERSION >= 340
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static int xen_add_to_physmap(XenIOState *state,
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target_phys_addr_t start_addr,
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ram_addr_t size,
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target_phys_addr_t phys_offset)
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{
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unsigned long i = 0;
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int rc = 0;
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XenPhysmap *physmap = NULL;
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target_phys_addr_t pfn, start_gpfn;
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if (get_physmapping(state, start_addr, size)) {
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return 0;
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}
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if (size <= 0) {
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return -1;
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}
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DPRINTF("mapping vram to %llx - %llx, from %llx\n",
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start_addr, start_addr + size, phys_offset);
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pfn = phys_offset >> TARGET_PAGE_BITS;
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start_gpfn = start_addr >> TARGET_PAGE_BITS;
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for (i = 0; i < size >> TARGET_PAGE_BITS; i++) {
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unsigned long idx = pfn + i;
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xen_pfn_t gpfn = start_gpfn + i;
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rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
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if (rc) {
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DPRINTF("add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
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PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
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return -rc;
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}
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}
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physmap = qemu_malloc(sizeof (XenPhysmap));
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physmap->start_addr = start_addr;
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physmap->size = size;
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physmap->phys_offset = phys_offset;
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QLIST_INSERT_HEAD(&state->physmap, physmap, list);
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xc_domain_pin_memory_cacheattr(xen_xc, xen_domid,
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start_addr >> TARGET_PAGE_BITS,
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(start_addr + size) >> TARGET_PAGE_BITS,
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XEN_DOMCTL_MEM_CACHEATTR_WB);
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return 0;
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}
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static int xen_remove_from_physmap(XenIOState *state,
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target_phys_addr_t start_addr,
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ram_addr_t size)
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{
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unsigned long i = 0;
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int rc = 0;
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XenPhysmap *physmap = NULL;
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target_phys_addr_t phys_offset = 0;
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physmap = get_physmapping(state, start_addr, size);
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if (physmap == NULL) {
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return -1;
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}
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phys_offset = physmap->phys_offset;
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size = physmap->size;
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DPRINTF("unmapping vram to %llx - %llx, from %llx\n",
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phys_offset, phys_offset + size, start_addr);
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size >>= TARGET_PAGE_BITS;
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start_addr >>= TARGET_PAGE_BITS;
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phys_offset >>= TARGET_PAGE_BITS;
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for (i = 0; i < size; i++) {
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unsigned long idx = start_addr + i;
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xen_pfn_t gpfn = phys_offset + i;
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rc = xc_domain_add_to_physmap(xen_xc, xen_domid, XENMAPSPACE_gmfn, idx, gpfn);
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if (rc) {
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fprintf(stderr, "add_to_physmap MFN %"PRI_xen_pfn" to PFN %"
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PRI_xen_pfn" failed: %d\n", idx, gpfn, rc);
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return -rc;
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}
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}
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QLIST_REMOVE(physmap, list);
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if (state->log_for_dirtybit == physmap) {
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state->log_for_dirtybit = NULL;
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}
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free(physmap);
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return 0;
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}
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#else
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static int xen_add_to_physmap(XenIOState *state,
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target_phys_addr_t start_addr,
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ram_addr_t size,
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target_phys_addr_t phys_offset)
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{
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return -ENOSYS;
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}
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static int xen_remove_from_physmap(XenIOState *state,
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target_phys_addr_t start_addr,
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ram_addr_t size)
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{
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return -ENOSYS;
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}
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#endif
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static void xen_client_set_memory(struct CPUPhysMemoryClient *client,
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target_phys_addr_t start_addr,
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ram_addr_t size,
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ram_addr_t phys_offset,
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bool log_dirty)
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{
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XenIOState *state = container_of(client, XenIOState, client);
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ram_addr_t flags = phys_offset & ~TARGET_PAGE_MASK;
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hvmmem_type_t mem_type;
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if (!(start_addr != phys_offset
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&& ( (log_dirty && flags < IO_MEM_UNASSIGNED)
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|| (!log_dirty && flags == IO_MEM_UNASSIGNED)))) {
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return;
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}
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trace_xen_client_set_memory(start_addr, size, phys_offset, log_dirty);
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start_addr &= TARGET_PAGE_MASK;
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size = TARGET_PAGE_ALIGN(size);
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phys_offset &= TARGET_PAGE_MASK;
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switch (flags) {
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case IO_MEM_RAM:
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xen_add_to_physmap(state, start_addr, size, phys_offset);
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break;
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case IO_MEM_ROM:
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mem_type = HVMMEM_ram_ro;
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if (xc_hvm_set_mem_type(xen_xc, xen_domid, mem_type,
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start_addr >> TARGET_PAGE_BITS,
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size >> TARGET_PAGE_BITS)) {
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DPRINTF("xc_hvm_set_mem_type error, addr: "TARGET_FMT_plx"\n",
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start_addr);
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}
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break;
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case IO_MEM_UNASSIGNED:
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if (xen_remove_from_physmap(state, start_addr, size) < 0) {
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DPRINTF("physmapping does not exist at "TARGET_FMT_plx"\n", start_addr);
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}
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break;
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}
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}
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static int xen_sync_dirty_bitmap(XenIOState *state,
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target_phys_addr_t start_addr,
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ram_addr_t size)
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{
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target_phys_addr_t npages = size >> TARGET_PAGE_BITS;
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target_phys_addr_t vram_offset = 0;
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const int width = sizeof(unsigned long) * 8;
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unsigned long bitmap[(npages + width - 1) / width];
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int rc, i, j;
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const XenPhysmap *physmap = NULL;
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physmap = get_physmapping(state, start_addr, size);
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if (physmap == NULL) {
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/* not handled */
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return -1;
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}
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if (state->log_for_dirtybit == NULL) {
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state->log_for_dirtybit = physmap;
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} else if (state->log_for_dirtybit != physmap) {
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return -1;
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}
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vram_offset = physmap->phys_offset;
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rc = xc_hvm_track_dirty_vram(xen_xc, xen_domid,
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start_addr >> TARGET_PAGE_BITS, npages,
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bitmap);
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if (rc) {
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return rc;
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}
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for (i = 0; i < ARRAY_SIZE(bitmap); i++) {
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unsigned long map = bitmap[i];
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while (map != 0) {
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j = ffsl(map) - 1;
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map &= ~(1ul << j);
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cpu_physical_memory_set_dirty(vram_offset + (i * width + j) * TARGET_PAGE_SIZE);
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};
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}
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return 0;
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}
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static int xen_log_start(CPUPhysMemoryClient *client, target_phys_addr_t phys_addr, ram_addr_t size)
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{
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XenIOState *state = container_of(client, XenIOState, client);
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return xen_sync_dirty_bitmap(state, phys_addr, size);
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}
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static int xen_log_stop(CPUPhysMemoryClient *client, target_phys_addr_t phys_addr, ram_addr_t size)
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{
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XenIOState *state = container_of(client, XenIOState, client);
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state->log_for_dirtybit = NULL;
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/* Disable dirty bit tracking */
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return xc_hvm_track_dirty_vram(xen_xc, xen_domid, 0, 0, NULL);
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}
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static int xen_client_sync_dirty_bitmap(struct CPUPhysMemoryClient *client,
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target_phys_addr_t start_addr,
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target_phys_addr_t end_addr)
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{
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XenIOState *state = container_of(client, XenIOState, client);
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return xen_sync_dirty_bitmap(state, start_addr, end_addr - start_addr);
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}
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static int xen_client_migration_log(struct CPUPhysMemoryClient *client,
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int enable)
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{
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return 0;
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}
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static CPUPhysMemoryClient xen_cpu_phys_memory_client = {
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.set_memory = xen_client_set_memory,
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.sync_dirty_bitmap = xen_client_sync_dirty_bitmap,
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.migration_log = xen_client_migration_log,
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.log_start = xen_log_start,
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.log_stop = xen_log_stop,
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};
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/* VCPU Operations, MMIO, IO ring ... */
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@ -581,6 +843,11 @@ int xen_hvm_init(void)
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qemu_add_vm_change_state_handler(xen_vm_change_state_handler, state);
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state->client = xen_cpu_phys_memory_client;
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QLIST_INIT(&state->physmap);
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cpu_register_phys_memory_client(&state->client);
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state->log_for_dirtybit = NULL;
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return 0;
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}
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