1085 lines
28 KiB
C
1085 lines
28 KiB
C
/*
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* QEMU SEV support
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*
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* Copyright Advanced Micro Devices 2016-2018
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*
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* Author:
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* Brijesh Singh <brijesh.singh@amd.com>
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*
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* This work is licensed under the terms of the GNU GPL, version 2 or later.
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* See the COPYING file in the top-level directory.
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*
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*/
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#include "qemu/osdep.h"
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#include <linux/kvm.h>
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#include <linux/psp-sev.h>
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#include <sys/ioctl.h>
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#include "qapi/error.h"
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#include "qom/object_interfaces.h"
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#include "qemu/base64.h"
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#include "qemu/module.h"
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#include "qemu/uuid.h"
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#include "sysemu/kvm.h"
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#include "sev_i386.h"
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#include "sysemu/sysemu.h"
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#include "sysemu/runstate.h"
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#include "trace.h"
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#include "migration/blocker.h"
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#include "qom/object.h"
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#include "monitor/monitor.h"
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#include "exec/confidential-guest-support.h"
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#include "hw/i386/pc.h"
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#define TYPE_SEV_GUEST "sev-guest"
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OBJECT_DECLARE_SIMPLE_TYPE(SevGuestState, SEV_GUEST)
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/**
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* SevGuestState:
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*
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* The SevGuestState object is used for creating and managing a SEV
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* guest.
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*
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* # $QEMU \
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* -object sev-guest,id=sev0 \
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* -machine ...,memory-encryption=sev0
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*/
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struct SevGuestState {
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ConfidentialGuestSupport parent_obj;
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/* configuration parameters */
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char *sev_device;
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uint32_t policy;
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char *dh_cert_file;
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char *session_file;
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uint32_t cbitpos;
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uint32_t reduced_phys_bits;
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/* runtime state */
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uint32_t handle;
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uint8_t api_major;
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uint8_t api_minor;
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uint8_t build_id;
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uint64_t me_mask;
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int sev_fd;
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SevState state;
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gchar *measurement;
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uint32_t reset_cs;
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uint32_t reset_ip;
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bool reset_data_valid;
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};
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#define DEFAULT_GUEST_POLICY 0x1 /* disable debug */
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#define DEFAULT_SEV_DEVICE "/dev/sev"
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#define SEV_INFO_BLOCK_GUID "00f771de-1a7e-4fcb-890e-68c77e2fb44e"
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typedef struct __attribute__((__packed__)) SevInfoBlock {
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/* SEV-ES Reset Vector Address */
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uint32_t reset_addr;
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} SevInfoBlock;
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static SevGuestState *sev_guest;
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static Error *sev_mig_blocker;
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static const char *const sev_fw_errlist[] = {
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"",
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"Platform state is invalid",
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"Guest state is invalid",
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"Platform configuration is invalid",
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"Buffer too small",
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"Platform is already owned",
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"Certificate is invalid",
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"Policy is not allowed",
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"Guest is not active",
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"Invalid address",
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"Bad signature",
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"Bad measurement",
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"Asid is already owned",
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"Invalid ASID",
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"WBINVD is required",
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"DF_FLUSH is required",
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"Guest handle is invalid",
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"Invalid command",
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"Guest is active",
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"Hardware error",
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"Hardware unsafe",
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"Feature not supported",
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"Invalid parameter"
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};
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#define SEV_FW_MAX_ERROR ARRAY_SIZE(sev_fw_errlist)
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static int
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sev_ioctl(int fd, int cmd, void *data, int *error)
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{
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int r;
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struct kvm_sev_cmd input;
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memset(&input, 0x0, sizeof(input));
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input.id = cmd;
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input.sev_fd = fd;
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input.data = (__u64)(unsigned long)data;
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, &input);
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if (error) {
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*error = input.error;
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}
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return r;
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}
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static int
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sev_platform_ioctl(int fd, int cmd, void *data, int *error)
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{
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int r;
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struct sev_issue_cmd arg;
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arg.cmd = cmd;
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arg.data = (unsigned long)data;
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r = ioctl(fd, SEV_ISSUE_CMD, &arg);
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if (error) {
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*error = arg.error;
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}
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return r;
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}
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static const char *
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fw_error_to_str(int code)
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{
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if (code < 0 || code >= SEV_FW_MAX_ERROR) {
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return "unknown error";
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}
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return sev_fw_errlist[code];
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}
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static bool
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sev_check_state(const SevGuestState *sev, SevState state)
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{
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assert(sev);
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return sev->state == state ? true : false;
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}
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static void
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sev_set_guest_state(SevGuestState *sev, SevState new_state)
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{
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assert(new_state < SEV_STATE__MAX);
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assert(sev);
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trace_kvm_sev_change_state(SevState_str(sev->state),
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SevState_str(new_state));
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sev->state = new_state;
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}
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static void
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sev_ram_block_added(RAMBlockNotifier *n, void *host, size_t size,
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size_t max_size)
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{
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int r;
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struct kvm_enc_region range;
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ram_addr_t offset;
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MemoryRegion *mr;
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/*
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* The RAM device presents a memory region that should be treated
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* as IO region and should not be pinned.
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*/
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mr = memory_region_from_host(host, &offset);
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if (mr && memory_region_is_ram_device(mr)) {
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return;
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}
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range.addr = (__u64)(unsigned long)host;
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range.size = max_size;
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trace_kvm_memcrypt_register_region(host, max_size);
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_REG_REGION, &range);
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if (r) {
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error_report("%s: failed to register region (%p+%#zx) error '%s'",
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__func__, host, max_size, strerror(errno));
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exit(1);
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}
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}
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static void
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sev_ram_block_removed(RAMBlockNotifier *n, void *host, size_t size,
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size_t max_size)
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{
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int r;
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struct kvm_enc_region range;
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ram_addr_t offset;
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MemoryRegion *mr;
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/*
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* The RAM device presents a memory region that should be treated
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* as IO region and should not have been pinned.
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*/
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mr = memory_region_from_host(host, &offset);
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if (mr && memory_region_is_ram_device(mr)) {
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return;
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}
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range.addr = (__u64)(unsigned long)host;
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range.size = max_size;
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trace_kvm_memcrypt_unregister_region(host, max_size);
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r = kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_UNREG_REGION, &range);
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if (r) {
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error_report("%s: failed to unregister region (%p+%#zx)",
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__func__, host, max_size);
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}
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}
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static struct RAMBlockNotifier sev_ram_notifier = {
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.ram_block_added = sev_ram_block_added,
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.ram_block_removed = sev_ram_block_removed,
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};
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static void
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sev_guest_finalize(Object *obj)
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{
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}
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static char *
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sev_guest_get_session_file(Object *obj, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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return s->session_file ? g_strdup(s->session_file) : NULL;
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}
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static void
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sev_guest_set_session_file(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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s->session_file = g_strdup(value);
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}
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static char *
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sev_guest_get_dh_cert_file(Object *obj, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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return g_strdup(s->dh_cert_file);
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}
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static void
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sev_guest_set_dh_cert_file(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *s = SEV_GUEST(obj);
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s->dh_cert_file = g_strdup(value);
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}
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static char *
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sev_guest_get_sev_device(Object *obj, Error **errp)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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return g_strdup(sev->sev_device);
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}
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static void
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sev_guest_set_sev_device(Object *obj, const char *value, Error **errp)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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sev->sev_device = g_strdup(value);
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}
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static void
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sev_guest_class_init(ObjectClass *oc, void *data)
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{
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object_class_property_add_str(oc, "sev-device",
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sev_guest_get_sev_device,
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sev_guest_set_sev_device);
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object_class_property_set_description(oc, "sev-device",
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"SEV device to use");
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object_class_property_add_str(oc, "dh-cert-file",
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sev_guest_get_dh_cert_file,
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sev_guest_set_dh_cert_file);
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object_class_property_set_description(oc, "dh-cert-file",
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"guest owners DH certificate (encoded with base64)");
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object_class_property_add_str(oc, "session-file",
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sev_guest_get_session_file,
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sev_guest_set_session_file);
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object_class_property_set_description(oc, "session-file",
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"guest owners session parameters (encoded with base64)");
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}
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static void
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sev_guest_instance_init(Object *obj)
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{
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SevGuestState *sev = SEV_GUEST(obj);
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sev->sev_device = g_strdup(DEFAULT_SEV_DEVICE);
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sev->policy = DEFAULT_GUEST_POLICY;
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object_property_add_uint32_ptr(obj, "policy", &sev->policy,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "handle", &sev->handle,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "cbitpos", &sev->cbitpos,
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OBJ_PROP_FLAG_READWRITE);
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object_property_add_uint32_ptr(obj, "reduced-phys-bits",
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&sev->reduced_phys_bits,
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OBJ_PROP_FLAG_READWRITE);
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}
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/* sev guest info */
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static const TypeInfo sev_guest_info = {
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.parent = TYPE_CONFIDENTIAL_GUEST_SUPPORT,
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.name = TYPE_SEV_GUEST,
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.instance_size = sizeof(SevGuestState),
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.instance_finalize = sev_guest_finalize,
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.class_init = sev_guest_class_init,
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.instance_init = sev_guest_instance_init,
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.interfaces = (InterfaceInfo[]) {
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{ TYPE_USER_CREATABLE },
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{ }
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}
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};
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bool
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sev_enabled(void)
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{
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return !!sev_guest;
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}
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bool
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sev_es_enabled(void)
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{
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return sev_enabled() && (sev_guest->policy & SEV_POLICY_ES);
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}
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uint64_t
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sev_get_me_mask(void)
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{
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return sev_guest ? sev_guest->me_mask : ~0;
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}
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uint32_t
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sev_get_cbit_position(void)
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{
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return sev_guest ? sev_guest->cbitpos : 0;
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}
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uint32_t
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sev_get_reduced_phys_bits(void)
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{
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return sev_guest ? sev_guest->reduced_phys_bits : 0;
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}
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SevInfo *
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sev_get_info(void)
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{
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SevInfo *info;
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info = g_new0(SevInfo, 1);
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info->enabled = sev_enabled();
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if (info->enabled) {
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info->api_major = sev_guest->api_major;
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info->api_minor = sev_guest->api_minor;
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info->build_id = sev_guest->build_id;
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info->policy = sev_guest->policy;
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info->state = sev_guest->state;
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info->handle = sev_guest->handle;
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}
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return info;
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}
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static int
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sev_get_pdh_info(int fd, guchar **pdh, size_t *pdh_len, guchar **cert_chain,
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size_t *cert_chain_len, Error **errp)
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{
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guchar *pdh_data = NULL;
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guchar *cert_chain_data = NULL;
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struct sev_user_data_pdh_cert_export export = {};
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int err, r;
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/* query the certificate length */
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r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
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if (r < 0) {
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if (err != SEV_RET_INVALID_LEN) {
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error_setg(errp, "failed to export PDH cert ret=%d fw_err=%d (%s)",
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r, err, fw_error_to_str(err));
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return 1;
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}
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}
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pdh_data = g_new(guchar, export.pdh_cert_len);
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cert_chain_data = g_new(guchar, export.cert_chain_len);
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export.pdh_cert_address = (unsigned long)pdh_data;
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export.cert_chain_address = (unsigned long)cert_chain_data;
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r = sev_platform_ioctl(fd, SEV_PDH_CERT_EXPORT, &export, &err);
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if (r < 0) {
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error_setg(errp, "failed to export PDH cert ret=%d fw_err=%d (%s)",
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r, err, fw_error_to_str(err));
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goto e_free;
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}
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*pdh = pdh_data;
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*pdh_len = export.pdh_cert_len;
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*cert_chain = cert_chain_data;
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*cert_chain_len = export.cert_chain_len;
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return 0;
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e_free:
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g_free(pdh_data);
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g_free(cert_chain_data);
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return 1;
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}
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SevCapability *
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sev_get_capabilities(Error **errp)
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{
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SevCapability *cap = NULL;
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guchar *pdh_data = NULL;
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guchar *cert_chain_data = NULL;
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size_t pdh_len = 0, cert_chain_len = 0;
|
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uint32_t ebx;
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int fd;
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|
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if (!kvm_enabled()) {
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error_setg(errp, "KVM not enabled");
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return NULL;
|
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}
|
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if (kvm_vm_ioctl(kvm_state, KVM_MEMORY_ENCRYPT_OP, NULL) < 0) {
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error_setg(errp, "SEV is not enabled in KVM");
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return NULL;
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}
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|
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fd = open(DEFAULT_SEV_DEVICE, O_RDWR);
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if (fd < 0) {
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error_setg_errno(errp, errno, "Failed to open %s",
|
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DEFAULT_SEV_DEVICE);
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return NULL;
|
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}
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|
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if (sev_get_pdh_info(fd, &pdh_data, &pdh_len,
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&cert_chain_data, &cert_chain_len, errp)) {
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goto out;
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}
|
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|
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cap = g_new0(SevCapability, 1);
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cap->pdh = g_base64_encode(pdh_data, pdh_len);
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cap->cert_chain = g_base64_encode(cert_chain_data, cert_chain_len);
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|
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host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
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cap->cbitpos = ebx & 0x3f;
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|
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/*
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* When SEV feature is enabled, we loose one bit in guest physical
|
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* addressing.
|
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*/
|
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cap->reduced_phys_bits = 1;
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|
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out:
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g_free(pdh_data);
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g_free(cert_chain_data);
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close(fd);
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return cap;
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}
|
|
|
|
SevAttestationReport *
|
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sev_get_attestation_report(const char *mnonce, Error **errp)
|
|
{
|
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struct kvm_sev_attestation_report input = {};
|
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SevAttestationReport *report = NULL;
|
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SevGuestState *sev = sev_guest;
|
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guchar *data;
|
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guchar *buf;
|
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gsize len;
|
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int err = 0, ret;
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|
|
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if (!sev_enabled()) {
|
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error_setg(errp, "SEV is not enabled");
|
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return NULL;
|
|
}
|
|
|
|
/* lets decode the mnonce string */
|
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buf = g_base64_decode(mnonce, &len);
|
|
if (!buf) {
|
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error_setg(errp, "SEV: failed to decode mnonce input");
|
|
return NULL;
|
|
}
|
|
|
|
/* verify the input mnonce length */
|
|
if (len != sizeof(input.mnonce)) {
|
|
error_setg(errp, "SEV: mnonce must be %zu bytes (got %" G_GSIZE_FORMAT ")",
|
|
sizeof(input.mnonce), len);
|
|
g_free(buf);
|
|
return NULL;
|
|
}
|
|
|
|
/* Query the report length */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_GET_ATTESTATION_REPORT,
|
|
&input, &err);
|
|
if (ret < 0) {
|
|
if (err != SEV_RET_INVALID_LEN) {
|
|
error_setg(errp, "failed to query the attestation report length "
|
|
"ret=%d fw_err=%d (%s)", ret, err, fw_error_to_str(err));
|
|
g_free(buf);
|
|
return NULL;
|
|
}
|
|
}
|
|
|
|
data = g_malloc(input.len);
|
|
input.uaddr = (unsigned long)data;
|
|
memcpy(input.mnonce, buf, sizeof(input.mnonce));
|
|
|
|
/* Query the report */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_GET_ATTESTATION_REPORT,
|
|
&input, &err);
|
|
if (ret) {
|
|
error_setg_errno(errp, errno, "Failed to get attestation report"
|
|
" ret=%d fw_err=%d (%s)", ret, err, fw_error_to_str(err));
|
|
goto e_free_data;
|
|
}
|
|
|
|
report = g_new0(SevAttestationReport, 1);
|
|
report->data = g_base64_encode(data, input.len);
|
|
|
|
trace_kvm_sev_attestation_report(mnonce, report->data);
|
|
|
|
e_free_data:
|
|
g_free(data);
|
|
g_free(buf);
|
|
return report;
|
|
}
|
|
|
|
static int
|
|
sev_read_file_base64(const char *filename, guchar **data, gsize *len)
|
|
{
|
|
gsize sz;
|
|
gchar *base64;
|
|
GError *error = NULL;
|
|
|
|
if (!g_file_get_contents(filename, &base64, &sz, &error)) {
|
|
error_report("failed to read '%s' (%s)", filename, error->message);
|
|
g_error_free(error);
|
|
return -1;
|
|
}
|
|
|
|
*data = g_base64_decode(base64, len);
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sev_launch_start(SevGuestState *sev)
|
|
{
|
|
gsize sz;
|
|
int ret = 1;
|
|
int fw_error, rc;
|
|
struct kvm_sev_launch_start *start;
|
|
guchar *session = NULL, *dh_cert = NULL;
|
|
|
|
start = g_new0(struct kvm_sev_launch_start, 1);
|
|
|
|
start->handle = sev->handle;
|
|
start->policy = sev->policy;
|
|
if (sev->session_file) {
|
|
if (sev_read_file_base64(sev->session_file, &session, &sz) < 0) {
|
|
goto out;
|
|
}
|
|
start->session_uaddr = (unsigned long)session;
|
|
start->session_len = sz;
|
|
}
|
|
|
|
if (sev->dh_cert_file) {
|
|
if (sev_read_file_base64(sev->dh_cert_file, &dh_cert, &sz) < 0) {
|
|
goto out;
|
|
}
|
|
start->dh_uaddr = (unsigned long)dh_cert;
|
|
start->dh_len = sz;
|
|
}
|
|
|
|
trace_kvm_sev_launch_start(start->policy, session, dh_cert);
|
|
rc = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_START, start, &fw_error);
|
|
if (rc < 0) {
|
|
error_report("%s: LAUNCH_START ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
goto out;
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_LAUNCH_UPDATE);
|
|
sev->handle = start->handle;
|
|
ret = 0;
|
|
|
|
out:
|
|
g_free(start);
|
|
g_free(session);
|
|
g_free(dh_cert);
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
sev_launch_update_data(SevGuestState *sev, uint8_t *addr, uint64_t len)
|
|
{
|
|
int ret, fw_error;
|
|
struct kvm_sev_launch_update_data update;
|
|
|
|
if (!addr || !len) {
|
|
return 1;
|
|
}
|
|
|
|
update.uaddr = (__u64)(unsigned long)addr;
|
|
update.len = len;
|
|
trace_kvm_sev_launch_update_data(addr, len);
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_DATA,
|
|
&update, &fw_error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_UPDATE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static int
|
|
sev_launch_update_vmsa(SevGuestState *sev)
|
|
{
|
|
int ret, fw_error;
|
|
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_UPDATE_VMSA, NULL, &fw_error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_UPDATE_VMSA ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
}
|
|
|
|
return ret;
|
|
}
|
|
|
|
static void
|
|
sev_launch_get_measure(Notifier *notifier, void *unused)
|
|
{
|
|
SevGuestState *sev = sev_guest;
|
|
int ret, error;
|
|
guchar *data;
|
|
struct kvm_sev_launch_measure *measurement;
|
|
|
|
if (!sev_check_state(sev, SEV_STATE_LAUNCH_UPDATE)) {
|
|
return;
|
|
}
|
|
|
|
if (sev_es_enabled()) {
|
|
/* measure all the VM save areas before getting launch_measure */
|
|
ret = sev_launch_update_vmsa(sev);
|
|
if (ret) {
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
measurement = g_new0(struct kvm_sev_launch_measure, 1);
|
|
|
|
/* query the measurement blob length */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
|
|
measurement, &error);
|
|
if (!measurement->len) {
|
|
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(errno));
|
|
goto free_measurement;
|
|
}
|
|
|
|
data = g_new0(guchar, measurement->len);
|
|
measurement->uaddr = (unsigned long)data;
|
|
|
|
/* get the measurement blob */
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_MEASURE,
|
|
measurement, &error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_MEASURE ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(errno));
|
|
goto free_data;
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_LAUNCH_SECRET);
|
|
|
|
/* encode the measurement value and emit the event */
|
|
sev->measurement = g_base64_encode(data, measurement->len);
|
|
trace_kvm_sev_launch_measurement(sev->measurement);
|
|
|
|
free_data:
|
|
g_free(data);
|
|
free_measurement:
|
|
g_free(measurement);
|
|
}
|
|
|
|
char *
|
|
sev_get_launch_measurement(void)
|
|
{
|
|
if (sev_guest &&
|
|
sev_guest->state >= SEV_STATE_LAUNCH_SECRET) {
|
|
return g_strdup(sev_guest->measurement);
|
|
}
|
|
|
|
return NULL;
|
|
}
|
|
|
|
static Notifier sev_machine_done_notify = {
|
|
.notify = sev_launch_get_measure,
|
|
};
|
|
|
|
static void
|
|
sev_launch_finish(SevGuestState *sev)
|
|
{
|
|
int ret, error;
|
|
Error *local_err = NULL;
|
|
|
|
trace_kvm_sev_launch_finish();
|
|
ret = sev_ioctl(sev->sev_fd, KVM_SEV_LAUNCH_FINISH, 0, &error);
|
|
if (ret) {
|
|
error_report("%s: LAUNCH_FINISH ret=%d fw_error=%d '%s'",
|
|
__func__, ret, error, fw_error_to_str(error));
|
|
exit(1);
|
|
}
|
|
|
|
sev_set_guest_state(sev, SEV_STATE_RUNNING);
|
|
|
|
/* add migration blocker */
|
|
error_setg(&sev_mig_blocker,
|
|
"SEV: Migration is not implemented");
|
|
ret = migrate_add_blocker(sev_mig_blocker, &local_err);
|
|
if (local_err) {
|
|
error_report_err(local_err);
|
|
error_free(sev_mig_blocker);
|
|
exit(1);
|
|
}
|
|
}
|
|
|
|
static void
|
|
sev_vm_state_change(void *opaque, bool running, RunState state)
|
|
{
|
|
SevGuestState *sev = opaque;
|
|
|
|
if (running) {
|
|
if (!sev_check_state(sev, SEV_STATE_RUNNING)) {
|
|
sev_launch_finish(sev);
|
|
}
|
|
}
|
|
}
|
|
|
|
int sev_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
|
|
{
|
|
SevGuestState *sev
|
|
= (SevGuestState *)object_dynamic_cast(OBJECT(cgs), TYPE_SEV_GUEST);
|
|
char *devname;
|
|
int ret, fw_error, cmd;
|
|
uint32_t ebx;
|
|
uint32_t host_cbitpos;
|
|
struct sev_user_data_status status = {};
|
|
|
|
if (!sev) {
|
|
return 0;
|
|
}
|
|
|
|
ret = ram_block_discard_disable(true);
|
|
if (ret) {
|
|
error_report("%s: cannot disable RAM discard", __func__);
|
|
return -1;
|
|
}
|
|
|
|
sev_guest = sev;
|
|
sev->state = SEV_STATE_UNINIT;
|
|
|
|
host_cpuid(0x8000001F, 0, NULL, &ebx, NULL, NULL);
|
|
host_cbitpos = ebx & 0x3f;
|
|
|
|
if (host_cbitpos != sev->cbitpos) {
|
|
error_setg(errp, "%s: cbitpos check failed, host '%d' requested '%d'",
|
|
__func__, host_cbitpos, sev->cbitpos);
|
|
goto err;
|
|
}
|
|
|
|
if (sev->reduced_phys_bits < 1) {
|
|
error_setg(errp, "%s: reduced_phys_bits check failed, it should be >=1,"
|
|
" requested '%d'", __func__, sev->reduced_phys_bits);
|
|
goto err;
|
|
}
|
|
|
|
sev->me_mask = ~(1UL << sev->cbitpos);
|
|
|
|
devname = object_property_get_str(OBJECT(sev), "sev-device", NULL);
|
|
sev->sev_fd = open(devname, O_RDWR);
|
|
if (sev->sev_fd < 0) {
|
|
error_setg(errp, "%s: Failed to open %s '%s'", __func__,
|
|
devname, strerror(errno));
|
|
g_free(devname);
|
|
goto err;
|
|
}
|
|
g_free(devname);
|
|
|
|
ret = sev_platform_ioctl(sev->sev_fd, SEV_PLATFORM_STATUS, &status,
|
|
&fw_error);
|
|
if (ret) {
|
|
error_setg(errp, "%s: failed to get platform status ret=%d "
|
|
"fw_error='%d: %s'", __func__, ret, fw_error,
|
|
fw_error_to_str(fw_error));
|
|
goto err;
|
|
}
|
|
sev->build_id = status.build;
|
|
sev->api_major = status.api_major;
|
|
sev->api_minor = status.api_minor;
|
|
|
|
if (sev_es_enabled()) {
|
|
if (!kvm_kernel_irqchip_allowed()) {
|
|
error_report("%s: SEV-ES guests require in-kernel irqchip support",
|
|
__func__);
|
|
goto err;
|
|
}
|
|
|
|
if (!(status.flags & SEV_STATUS_FLAGS_CONFIG_ES)) {
|
|
error_report("%s: guest policy requires SEV-ES, but "
|
|
"host SEV-ES support unavailable",
|
|
__func__);
|
|
goto err;
|
|
}
|
|
cmd = KVM_SEV_ES_INIT;
|
|
} else {
|
|
cmd = KVM_SEV_INIT;
|
|
}
|
|
|
|
trace_kvm_sev_init();
|
|
ret = sev_ioctl(sev->sev_fd, cmd, NULL, &fw_error);
|
|
if (ret) {
|
|
error_setg(errp, "%s: failed to initialize ret=%d fw_error=%d '%s'",
|
|
__func__, ret, fw_error, fw_error_to_str(fw_error));
|
|
goto err;
|
|
}
|
|
|
|
ret = sev_launch_start(sev);
|
|
if (ret) {
|
|
error_setg(errp, "%s: failed to create encryption context", __func__);
|
|
goto err;
|
|
}
|
|
|
|
ram_block_notifier_add(&sev_ram_notifier);
|
|
qemu_add_machine_init_done_notifier(&sev_machine_done_notify);
|
|
qemu_add_vm_change_state_handler(sev_vm_state_change, sev);
|
|
|
|
cgs->ready = true;
|
|
|
|
return 0;
|
|
err:
|
|
sev_guest = NULL;
|
|
ram_block_discard_disable(false);
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
sev_encrypt_flash(uint8_t *ptr, uint64_t len, Error **errp)
|
|
{
|
|
if (!sev_guest) {
|
|
return 0;
|
|
}
|
|
|
|
/* if SEV is in update state then encrypt the data else do nothing */
|
|
if (sev_check_state(sev_guest, SEV_STATE_LAUNCH_UPDATE)) {
|
|
int ret = sev_launch_update_data(sev_guest, ptr, len);
|
|
if (ret < 0) {
|
|
error_setg(errp, "failed to encrypt pflash rom");
|
|
return ret;
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int sev_inject_launch_secret(const char *packet_hdr, const char *secret,
|
|
uint64_t gpa, Error **errp)
|
|
{
|
|
struct kvm_sev_launch_secret input;
|
|
g_autofree guchar *data = NULL, *hdr = NULL;
|
|
int error, ret = 1;
|
|
void *hva;
|
|
gsize hdr_sz = 0, data_sz = 0;
|
|
MemoryRegion *mr = NULL;
|
|
|
|
if (!sev_guest) {
|
|
error_setg(errp, "SEV: SEV not enabled.");
|
|
return 1;
|
|
}
|
|
|
|
/* secret can be injected only in this state */
|
|
if (!sev_check_state(sev_guest, SEV_STATE_LAUNCH_SECRET)) {
|
|
error_setg(errp, "SEV: Not in correct state. (LSECRET) %x",
|
|
sev_guest->state);
|
|
return 1;
|
|
}
|
|
|
|
hdr = g_base64_decode(packet_hdr, &hdr_sz);
|
|
if (!hdr || !hdr_sz) {
|
|
error_setg(errp, "SEV: Failed to decode sequence header");
|
|
return 1;
|
|
}
|
|
|
|
data = g_base64_decode(secret, &data_sz);
|
|
if (!data || !data_sz) {
|
|
error_setg(errp, "SEV: Failed to decode data");
|
|
return 1;
|
|
}
|
|
|
|
hva = gpa2hva(&mr, gpa, data_sz, errp);
|
|
if (!hva) {
|
|
error_prepend(errp, "SEV: Failed to calculate guest address: ");
|
|
return 1;
|
|
}
|
|
|
|
input.hdr_uaddr = (uint64_t)(unsigned long)hdr;
|
|
input.hdr_len = hdr_sz;
|
|
|
|
input.trans_uaddr = (uint64_t)(unsigned long)data;
|
|
input.trans_len = data_sz;
|
|
|
|
input.guest_uaddr = (uint64_t)(unsigned long)hva;
|
|
input.guest_len = data_sz;
|
|
|
|
trace_kvm_sev_launch_secret(gpa, input.guest_uaddr,
|
|
input.trans_uaddr, input.trans_len);
|
|
|
|
ret = sev_ioctl(sev_guest->sev_fd, KVM_SEV_LAUNCH_SECRET,
|
|
&input, &error);
|
|
if (ret) {
|
|
error_setg(errp, "SEV: failed to inject secret ret=%d fw_error=%d '%s'",
|
|
ret, error, fw_error_to_str(error));
|
|
return ret;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sev_es_parse_reset_block(SevInfoBlock *info, uint32_t *addr)
|
|
{
|
|
if (!info->reset_addr) {
|
|
error_report("SEV-ES reset address is zero");
|
|
return 1;
|
|
}
|
|
|
|
*addr = info->reset_addr;
|
|
|
|
return 0;
|
|
}
|
|
|
|
static int
|
|
sev_es_find_reset_vector(void *flash_ptr, uint64_t flash_size,
|
|
uint32_t *addr)
|
|
{
|
|
QemuUUID info_guid, *guid;
|
|
SevInfoBlock *info;
|
|
uint8_t *data;
|
|
uint16_t *len;
|
|
|
|
/*
|
|
* Initialize the address to zero. An address of zero with a successful
|
|
* return code indicates that SEV-ES is not active.
|
|
*/
|
|
*addr = 0;
|
|
|
|
/*
|
|
* Extract the AP reset vector for SEV-ES guests by locating the SEV GUID.
|
|
* The SEV GUID is located on its own (original implementation) or within
|
|
* the Firmware GUID Table (new implementation), either of which are
|
|
* located 32 bytes from the end of the flash.
|
|
*
|
|
* Check the Firmware GUID Table first.
|
|
*/
|
|
if (pc_system_ovmf_table_find(SEV_INFO_BLOCK_GUID, &data, NULL)) {
|
|
return sev_es_parse_reset_block((SevInfoBlock *)data, addr);
|
|
}
|
|
|
|
/*
|
|
* SEV info block not found in the Firmware GUID Table (or there isn't
|
|
* a Firmware GUID Table), fall back to the original implementation.
|
|
*/
|
|
data = flash_ptr + flash_size - 0x20;
|
|
|
|
qemu_uuid_parse(SEV_INFO_BLOCK_GUID, &info_guid);
|
|
info_guid = qemu_uuid_bswap(info_guid); /* GUIDs are LE */
|
|
|
|
guid = (QemuUUID *)(data - sizeof(info_guid));
|
|
if (!qemu_uuid_is_equal(guid, &info_guid)) {
|
|
error_report("SEV information block/Firmware GUID Table block not found in pflash rom");
|
|
return 1;
|
|
}
|
|
|
|
len = (uint16_t *)((uint8_t *)guid - sizeof(*len));
|
|
info = (SevInfoBlock *)(data - le16_to_cpu(*len));
|
|
|
|
return sev_es_parse_reset_block(info, addr);
|
|
}
|
|
|
|
void sev_es_set_reset_vector(CPUState *cpu)
|
|
{
|
|
X86CPU *x86;
|
|
CPUX86State *env;
|
|
|
|
/* Only update if we have valid reset information */
|
|
if (!sev_guest || !sev_guest->reset_data_valid) {
|
|
return;
|
|
}
|
|
|
|
/* Do not update the BSP reset state */
|
|
if (cpu->cpu_index == 0) {
|
|
return;
|
|
}
|
|
|
|
x86 = X86_CPU(cpu);
|
|
env = &x86->env;
|
|
|
|
cpu_x86_load_seg_cache(env, R_CS, 0xf000, sev_guest->reset_cs, 0xffff,
|
|
DESC_P_MASK | DESC_S_MASK | DESC_CS_MASK |
|
|
DESC_R_MASK | DESC_A_MASK);
|
|
|
|
env->eip = sev_guest->reset_ip;
|
|
}
|
|
|
|
int sev_es_save_reset_vector(void *flash_ptr, uint64_t flash_size)
|
|
{
|
|
CPUState *cpu;
|
|
uint32_t addr;
|
|
int ret;
|
|
|
|
if (!sev_es_enabled()) {
|
|
return 0;
|
|
}
|
|
|
|
addr = 0;
|
|
ret = sev_es_find_reset_vector(flash_ptr, flash_size,
|
|
&addr);
|
|
if (ret) {
|
|
return ret;
|
|
}
|
|
|
|
if (addr) {
|
|
sev_guest->reset_cs = addr & 0xffff0000;
|
|
sev_guest->reset_ip = addr & 0x0000ffff;
|
|
sev_guest->reset_data_valid = true;
|
|
|
|
CPU_FOREACH(cpu) {
|
|
sev_es_set_reset_vector(cpu);
|
|
}
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
static void
|
|
sev_register_types(void)
|
|
{
|
|
type_register_static(&sev_guest_info);
|
|
}
|
|
|
|
type_init(sev_register_types);
|