From: Maxim Levitsky <mlevi...@redhat.com>
This allows to make PDPTRs part of the migration
stream and thus not reload them after migration which
is against X86 spec.
Signed-off-by: Maxim Levitsky <mlevi...@redhat.com>
Message-Id: <20211101132300.192584-2-mlevi...@redhat.com>
Signed-off-by: Paolo Bonzini <pbonz...@redhat.com>
---
target/i386/cpu.h | 3 ++
target/i386/kvm/kvm.c | 108 +++++++++++++++++++++++++++++++++++++++++-
target/i386/machine.c | 29 ++++++++++++
3 files changed, 138 insertions(+), 2 deletions(-)
diff --git a/target/i386/cpu.h b/target/i386/cpu.h
index 04f2b790c9..9911d7c871 100644
--- a/target/i386/cpu.h
+++ b/target/i386/cpu.h
@@ -1455,6 +1455,9 @@ typedef struct CPUX86State {
SegmentCache idt; /* only base and limit are used */
target_ulong cr[5]; /* NOTE: cr1 is unused */
+
+ bool pdptrs_valid;
+ uint64_t pdptrs[4];
int32_t a20_mask;
BNDReg bnd_regs[4];
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index 13f8e30c2a..d81745620b 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -124,6 +124,7 @@ static uint32_t num_architectural_pmu_fixed_counters;
static int has_xsave;
static int has_xcrs;
static int has_pit_state2;
+static int has_sregs2;
static int has_exception_payload;
static bool has_msr_mcg_ext_ctl;
@@ -2324,6 +2325,7 @@ int kvm_arch_init(MachineState *ms, KVMState *s)
has_xsave = kvm_check_extension(s, KVM_CAP_XSAVE);
has_xcrs = kvm_check_extension(s, KVM_CAP_XCRS);
has_pit_state2 = kvm_check_extension(s, KVM_CAP_PIT_STATE2);
+ has_sregs2 = kvm_check_extension(s, KVM_CAP_SREGS2) > 0;
hv_vpindex_settable = kvm_check_extension(s, KVM_CAP_HYPERV_VP_INDEX);
@@ -2650,6 +2652,61 @@ static int kvm_put_sregs(X86CPU *cpu)
return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_SREGS, &sregs);
}
+static int kvm_put_sregs2(X86CPU *cpu)
+{
+ CPUX86State *env = &cpu->env;
+ struct kvm_sregs2 sregs;
+ int i;
+
+ sregs.flags = 0;
+
+ if ((env->eflags & VM_MASK)) {
+ set_v8086_seg(&sregs.cs, &env->segs[R_CS]);
+ set_v8086_seg(&sregs.ds, &env->segs[R_DS]);
+ set_v8086_seg(&sregs.es, &env->segs[R_ES]);
+ set_v8086_seg(&sregs.fs, &env->segs[R_FS]);
+ set_v8086_seg(&sregs.gs, &env->segs[R_GS]);
+ set_v8086_seg(&sregs.ss, &env->segs[R_SS]);
+ } else {
+ set_seg(&sregs.cs, &env->segs[R_CS]);
+ set_seg(&sregs.ds, &env->segs[R_DS]);
+ set_seg(&sregs.es, &env->segs[R_ES]);
+ set_seg(&sregs.fs, &env->segs[R_FS]);
+ set_seg(&sregs.gs, &env->segs[R_GS]);
+ set_seg(&sregs.ss, &env->segs[R_SS]);
+ }
+
+ set_seg(&sregs.tr, &env->tr);
+ set_seg(&sregs.ldt, &env->ldt);
+
+ sregs.idt.limit = env->idt.limit;
+ sregs.idt.base = env->idt.base;
+ memset(sregs.idt.padding, 0, sizeof sregs.idt.padding);
+ sregs.gdt.limit = env->gdt.limit;
+ sregs.gdt.base = env->gdt.base;
+ memset(sregs.gdt.padding, 0, sizeof sregs.gdt.padding);
+
+ sregs.cr0 = env->cr[0];
+ sregs.cr2 = env->cr[2];
+ sregs.cr3 = env->cr[3];
+ sregs.cr4 = env->cr[4];
+
+ sregs.cr8 = cpu_get_apic_tpr(cpu->apic_state);
+ sregs.apic_base = cpu_get_apic_base(cpu->apic_state);
+
+ sregs.efer = env->efer;
+
+ if (env->pdptrs_valid) {
+ for (i = 0; i < 4; i++) {
+ sregs.pdptrs[i] = env->pdptrs[i];
+ }
+ sregs.flags |= KVM_SREGS2_FLAGS_PDPTRS_VALID;
+ }
+
+ return kvm_vcpu_ioctl(CPU(cpu), KVM_SET_SREGS2, &sregs);
+}
+
+
static void kvm_msr_buf_reset(X86CPU *cpu)
{
memset(cpu->kvm_msr_buf, 0, MSR_BUF_SIZE);
@@ -3330,6 +3387,53 @@ static int kvm_get_sregs(X86CPU *cpu)
return 0;
}
+static int kvm_get_sregs2(X86CPU *cpu)
+{
+ CPUX86State *env = &cpu->env;
+ struct kvm_sregs2 sregs;
+ int i, ret;
+
+ ret = kvm_vcpu_ioctl(CPU(cpu), KVM_GET_SREGS2, &sregs);
+ if (ret < 0) {
+ return ret;
+ }
+
+ get_seg(&env->segs[R_CS], &sregs.cs);
+ get_seg(&env->segs[R_DS], &sregs.ds);
+ get_seg(&env->segs[R_ES], &sregs.es);
+ get_seg(&env->segs[R_FS], &sregs.fs);
+ get_seg(&env->segs[R_GS], &sregs.gs);
+ get_seg(&env->segs[R_SS], &sregs.ss);
+
+ get_seg(&env->tr, &sregs.tr);
+ get_seg(&env->ldt, &sregs.ldt);
+
+ env->idt.limit = sregs.idt.limit;
+ env->idt.base = sregs.idt.base;
+ env->gdt.limit = sregs.gdt.limit;
+ env->gdt.base = sregs.gdt.base;
+
+ env->cr[0] = sregs.cr0;
+ env->cr[2] = sregs.cr2;
+ env->cr[3] = sregs.cr3;
+ env->cr[4] = sregs.cr4;
+
+ env->efer = sregs.efer;
+
+ env->pdptrs_valid = sregs.flags & KVM_SREGS2_FLAGS_PDPTRS_VALID;
+
+ if (env->pdptrs_valid) {
+ for (i = 0; i < 4; i++) {
+ env->pdptrs[i] = sregs.pdptrs[i];
+ }
+ }
+
+ /* changes to apic base and cr8/tpr are read back via kvm_arch_post_run */
+ x86_update_hflags(env);
+
+ return 0;
+}
+
static int kvm_get_msrs(X86CPU *cpu)
{
CPUX86State *env = &cpu->env;
@@ -4173,7 +4277,7 @@ int kvm_arch_put_registers(CPUState *cpu, int level)
assert(cpu_is_stopped(cpu) || qemu_cpu_is_self(cpu));
/* must be before kvm_put_nested_state so that EFER.SVME is set */
- ret = kvm_put_sregs(x86_cpu);
+ ret = has_sregs2 ? kvm_put_sregs2(x86_cpu) : kvm_put_sregs(x86_cpu);
if (ret < 0) {
return ret;
}
@@ -4278,7 +4382,7 @@ int kvm_arch_get_registers(CPUState *cs)
if (ret < 0) {
goto out;
}
- ret = kvm_get_sregs(cpu);
+ ret = has_sregs2 ? kvm_get_sregs2(cpu) : kvm_get_sregs(cpu);
if (ret < 0) {
goto out;
}
diff --git a/target/i386/machine.c b/target/i386/machine.c
index 83c2b91529..6202f47793 100644
--- a/target/i386/machine.c
+++ b/target/i386/machine.c
@@ -1451,6 +1451,34 @@ static const VMStateDescription vmstate_msr_intel_sgx = {
.needed = intel_sgx_msrs_needed,
.fields = (VMStateField[]) {
VMSTATE_UINT64_ARRAY(env.msr_ia32_sgxlepubkeyhash, X86CPU, 4),
+ VMSTATE_END_OF_LIST()
+ }
+ };
+
+static bool pdptrs_needed(void *opaque)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+ return env->pdptrs_valid;
+}
+
+static int pdptrs_post_load(void *opaque, int version_id)
+{
+ X86CPU *cpu = opaque;
+ CPUX86State *env = &cpu->env;
+ env->pdptrs_valid = true;
+ return 0;
+}
+
+
+static const VMStateDescription vmstate_pdptrs = {
+ .name = "cpu/pdptrs",
+ .version_id = 1,
+ .minimum_version_id = 1,
+ .needed = pdptrs_needed,
+ .post_load = pdptrs_post_load,
+ .fields = (VMStateField[]) {
+ VMSTATE_UINT64_ARRAY(env.pdptrs, X86CPU, 4),
VMSTATE_END_OF_LIST()
}
};
@@ -1593,6 +1621,7 @@ const VMStateDescription vmstate_x86_cpu = {
#endif
&vmstate_msr_tsx_ctrl,
&vmstate_msr_intel_sgx,
+ &vmstate_pdptrs,
NULL
}
};
--
2.33.1
