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-rw-r--r--arch/x86/include/asm/kvm_emulate.h2
-rw-r--r--arch/x86/include/asm/kvm_host.h3
-rw-r--r--arch/x86/kvm/emulate.c9
-rw-r--r--arch/x86/kvm/svm.c15
-rw-r--r--arch/x86/kvm/vmx.c15
-rw-r--r--arch/x86/kvm/x86.c15
6 files changed, 58 insertions, 1 deletions
diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h
index fa2558e12024..ad38c5e918ec 100644
--- a/arch/x86/include/asm/kvm_emulate.h
+++ b/arch/x86/include/asm/kvm_emulate.h
@@ -225,6 +225,8 @@ struct x86_emulate_ops {
unsigned (*get_hflags)(struct x86_emulate_ctxt *ctxt);
void (*set_hflags)(struct x86_emulate_ctxt *ctxt, unsigned hflags);
+ int (*pre_leave_smm)(struct x86_emulate_ctxt *ctxt, u64 smbase);
+
};
typedef u32 __attribute__((vector_size(16))) sse128_t;
diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index c73e493adf07..23a9a5339f3f 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1061,6 +1061,9 @@ struct kvm_x86_ops {
void (*cancel_hv_timer)(struct kvm_vcpu *vcpu);
void (*setup_mce)(struct kvm_vcpu *vcpu);
+
+ int (*pre_enter_smm)(struct kvm_vcpu *vcpu, char *smstate);
+ int (*pre_leave_smm)(struct kvm_vcpu *vcpu, u64 smbase);
};
struct kvm_arch_async_pf {
diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index d90cdc77e077..8079d141792a 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -2591,6 +2591,15 @@ static int em_rsm(struct x86_emulate_ctxt *ctxt)
ctxt->ops->set_msr(ctxt, MSR_EFER, efer);
smbase = ctxt->ops->get_smbase(ctxt);
+
+ /*
+ * Give pre_leave_smm() a chance to make ISA-specific changes to the
+ * vCPU state (e.g. enter guest mode) before loading state from the SMM
+ * state-save area.
+ */
+ if (ctxt->ops->pre_leave_smm(ctxt, smbase))
+ return X86EMUL_UNHANDLEABLE;
+
if (emulator_has_longmode(ctxt))
ret = rsm_load_state_64(ctxt, smbase + 0x8000);
else
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 84f18634d87c..c4e9b99d48d8 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -5401,6 +5401,18 @@ static void svm_setup_mce(struct kvm_vcpu *vcpu)
vcpu->arch.mcg_cap &= 0x1ff;
}
+static int svm_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
+{
+ /* TODO: Implement */
+ return 0;
+}
+
+static int svm_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)
+{
+ /* TODO: Implement */
+ return 0;
+}
+
static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.cpu_has_kvm_support = has_svm,
.disabled_by_bios = is_disabled,
@@ -5511,6 +5523,9 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.deliver_posted_interrupt = svm_deliver_avic_intr,
.update_pi_irte = svm_update_pi_irte,
.setup_mce = svm_setup_mce,
+
+ .pre_enter_smm = svm_pre_enter_smm,
+ .pre_leave_smm = svm_pre_leave_smm,
};
static int __init svm_init(void)
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c9214e3a01df..1305bb65688b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -11916,6 +11916,18 @@ static void vmx_setup_mce(struct kvm_vcpu *vcpu)
~FEATURE_CONTROL_LMCE;
}
+static int vmx_pre_enter_smm(struct kvm_vcpu *vcpu, char *smstate)
+{
+ /* TODO: Implement */
+ return 0;
+}
+
+static int vmx_pre_leave_smm(struct kvm_vcpu *vcpu, u64 smbase)
+{
+ /* TODO: Implement */
+ return 0;
+}
+
static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.cpu_has_kvm_support = cpu_has_kvm_support,
.disabled_by_bios = vmx_disabled_by_bios,
@@ -12041,6 +12053,9 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
#endif
.setup_mce = vmx_setup_mce,
+
+ .pre_enter_smm = vmx_pre_enter_smm,
+ .pre_leave_smm = vmx_pre_leave_smm,
};
static int __init vmx_init(void)
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4ac261000e7e..9e85a69ccb12 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5281,6 +5281,11 @@ static void emulator_set_hflags(struct x86_emulate_ctxt *ctxt, unsigned emul_fla
kvm_set_hflags(emul_to_vcpu(ctxt), emul_flags);
}
+static int emulator_pre_leave_smm(struct x86_emulate_ctxt *ctxt, u64 smbase)
+{
+ return kvm_x86_ops->pre_leave_smm(emul_to_vcpu(ctxt), smbase);
+}
+
static const struct x86_emulate_ops emulate_ops = {
.read_gpr = emulator_read_gpr,
.write_gpr = emulator_write_gpr,
@@ -5322,6 +5327,7 @@ static const struct x86_emulate_ops emulate_ops = {
.set_nmi_mask = emulator_set_nmi_mask,
.get_hflags = emulator_get_hflags,
.set_hflags = emulator_set_hflags,
+ .pre_leave_smm = emulator_pre_leave_smm,
};
static void toggle_interruptibility(struct kvm_vcpu *vcpu, u32 mask)
@@ -6647,13 +6653,20 @@ static void enter_smm(struct kvm_vcpu *vcpu)
u32 cr0;
trace_kvm_enter_smm(vcpu->vcpu_id, vcpu->arch.smbase, true);
- vcpu->arch.hflags |= HF_SMM_MASK;
memset(buf, 0, 512);
if (guest_cpuid_has(vcpu, X86_FEATURE_LM))
enter_smm_save_state_64(vcpu, buf);
else
enter_smm_save_state_32(vcpu, buf);
+ /*
+ * Give pre_enter_smm() a chance to make ISA-specific changes to the
+ * vCPU state (e.g. leave guest mode) after we've saved the state into
+ * the SMM state-save area.
+ */
+ kvm_x86_ops->pre_enter_smm(vcpu, buf);
+
+ vcpu->arch.hflags |= HF_SMM_MASK;
kvm_vcpu_write_guest(vcpu, vcpu->arch.smbase + 0xfe00, buf, sizeof(buf));
if (kvm_x86_ops->get_nmi_mask(vcpu))