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Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
-rw-r--r--arch/x86/kvm/svm/svm.c73
1 files changed, 29 insertions, 44 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 9507df93f410..f3bb30b40876 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -199,7 +199,7 @@ module_param_named(npt, npt_enabled, bool, 0444);
/* allow nested virtualization in KVM/SVM */
static int nested = true;
-module_param(nested, int, S_IRUGO);
+module_param(nested, int, 0444);
/* enable/disable Next RIP Save */
int nrips = true;
@@ -364,8 +364,6 @@ static void svm_set_interrupt_shadow(struct kvm_vcpu *vcpu, int mask)
svm->vmcb->control.int_state |= SVM_INTERRUPT_SHADOW_MASK;
}
-static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
- void *insn, int insn_len);
static int __svm_skip_emulated_instruction(struct kvm_vcpu *vcpu,
bool commit_side_effects)
@@ -386,14 +384,6 @@ static int __svm_skip_emulated_instruction(struct kvm_vcpu *vcpu,
}
if (!svm->next_rip) {
- /*
- * FIXME: Drop this when kvm_emulate_instruction() does the
- * right thing and treats "can't emulate" as outright failure
- * for EMULTYPE_SKIP.
- */
- if (!svm_can_emulate_instruction(vcpu, EMULTYPE_SKIP, NULL, 0))
- return 0;
-
if (unlikely(!commit_side_effects))
old_rflags = svm->vmcb->save.rflags;
@@ -531,8 +521,6 @@ static bool __kvm_is_svm_supported(void)
int cpu = smp_processor_id();
struct cpuinfo_x86 *c = &cpu_data(cpu);
- u64 vm_cr;
-
if (c->x86_vendor != X86_VENDOR_AMD &&
c->x86_vendor != X86_VENDOR_HYGON) {
pr_err("CPU %d isn't AMD or Hygon\n", cpu);
@@ -549,12 +537,6 @@ static bool __kvm_is_svm_supported(void)
return false;
}
- rdmsrl(MSR_VM_CR, vm_cr);
- if (vm_cr & (1 << SVM_VM_CR_SVM_DISABLE)) {
- pr_err("SVM disabled (by BIOS) in MSR_VM_CR on CPU %d\n", cpu);
- return false;
- }
-
return true;
}
@@ -691,7 +673,7 @@ static int svm_hardware_enable(void)
*/
if (boot_cpu_has(X86_FEATURE_V_TSC_AUX)) {
struct sev_es_save_area *hostsa;
- u32 msr_hi;
+ u32 __maybe_unused msr_hi;
hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400);
@@ -913,8 +895,7 @@ void svm_set_x2apic_msr_interception(struct vcpu_svm *svm, bool intercept)
if (intercept == svm->x2avic_msrs_intercepted)
return;
- if (!x2avic_enabled ||
- !apic_x2apic_mode(svm->vcpu.arch.apic))
+ if (!x2avic_enabled)
return;
for (i = 0; i < MAX_DIRECT_ACCESS_MSRS; i++) {
@@ -1874,15 +1855,17 @@ void svm_set_cr0(struct kvm_vcpu *vcpu, unsigned long cr0)
bool old_paging = is_paging(vcpu);
#ifdef CONFIG_X86_64
- if (vcpu->arch.efer & EFER_LME && !vcpu->arch.guest_state_protected) {
+ if (vcpu->arch.efer & EFER_LME) {
if (!is_paging(vcpu) && (cr0 & X86_CR0_PG)) {
vcpu->arch.efer |= EFER_LMA;
- svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
+ if (!vcpu->arch.guest_state_protected)
+ svm->vmcb->save.efer |= EFER_LMA | EFER_LME;
}
if (is_paging(vcpu) && !(cr0 & X86_CR0_PG)) {
vcpu->arch.efer &= ~EFER_LMA;
- svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
+ if (!vcpu->arch.guest_state_protected)
+ svm->vmcb->save.efer &= ~(EFER_LMA | EFER_LME);
}
}
#endif
@@ -2203,12 +2186,6 @@ static int shutdown_interception(struct kvm_vcpu *vcpu)
struct kvm_run *kvm_run = vcpu->run;
struct vcpu_svm *svm = to_svm(vcpu);
- /*
- * The VM save area has already been encrypted so it
- * cannot be reinitialized - just terminate.
- */
- if (sev_es_guest(vcpu->kvm))
- return -EINVAL;
/*
* VMCB is undefined after a SHUTDOWN intercept. INIT the vCPU to put
@@ -2217,9 +2194,14 @@ static int shutdown_interception(struct kvm_vcpu *vcpu)
* userspace. At a platform view, INIT is acceptable behavior as
* there exist bare metal platforms that automatically INIT the CPU
* in response to shutdown.
+ *
+ * The VM save area for SEV-ES guests has already been encrypted so it
+ * cannot be reinitialized, i.e. synthesizing INIT is futile.
*/
- clear_page(svm->vmcb);
- kvm_vcpu_reset(vcpu, true);
+ if (!sev_es_guest(vcpu->kvm)) {
+ clear_page(svm->vmcb);
+ kvm_vcpu_reset(vcpu, true);
+ }
kvm_run->exit_reason = KVM_EXIT_SHUTDOWN;
return 0;
@@ -4728,15 +4710,15 @@ static void svm_enable_smi_window(struct kvm_vcpu *vcpu)
}
#endif
-static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
- void *insn, int insn_len)
+static int svm_check_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
+ void *insn, int insn_len)
{
bool smep, smap, is_user;
u64 error_code;
/* Emulation is always possible when KVM has access to all guest state. */
if (!sev_guest(vcpu->kvm))
- return true;
+ return X86EMUL_CONTINUE;
/* #UD and #GP should never be intercepted for SEV guests. */
WARN_ON_ONCE(emul_type & (EMULTYPE_TRAP_UD |
@@ -4748,14 +4730,14 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
* to guest register state.
*/
if (sev_es_guest(vcpu->kvm))
- return false;
+ return X86EMUL_RETRY_INSTR;
/*
* Emulation is possible if the instruction is already decoded, e.g.
* when completing I/O after returning from userspace.
*/
if (emul_type & EMULTYPE_NO_DECODE)
- return true;
+ return X86EMUL_CONTINUE;
/*
* Emulation is possible for SEV guests if and only if a prefilled
@@ -4781,9 +4763,11 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
* success (and in practice it will work the vast majority of the time).
*/
if (unlikely(!insn)) {
- if (!(emul_type & EMULTYPE_SKIP))
- kvm_queue_exception(vcpu, UD_VECTOR);
- return false;
+ if (emul_type & EMULTYPE_SKIP)
+ return X86EMUL_UNHANDLEABLE;
+
+ kvm_queue_exception(vcpu, UD_VECTOR);
+ return X86EMUL_PROPAGATE_FAULT;
}
/*
@@ -4794,7 +4778,7 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
* table used to translate CS:RIP resides in emulated MMIO.
*/
if (likely(insn_len))
- return true;
+ return X86EMUL_CONTINUE;
/*
* Detect and workaround Errata 1096 Fam_17h_00_0Fh.
@@ -4852,6 +4836,7 @@ static bool svm_can_emulate_instruction(struct kvm_vcpu *vcpu, int emul_type,
kvm_inject_gp(vcpu, 0);
else
kvm_make_request(KVM_REQ_TRIPLE_FAULT, vcpu);
+ return X86EMUL_PROPAGATE_FAULT;
}
resume_guest:
@@ -4869,7 +4854,7 @@ resume_guest:
* doesn't explicitly define "ignored", i.e. doing nothing and letting
* the guest spin is technically "ignoring" the access.
*/
- return false;
+ return X86EMUL_RETRY_INSTR;
}
static bool svm_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
@@ -5029,7 +5014,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.vm_copy_enc_context_from = sev_vm_copy_enc_context_from,
.vm_move_enc_context_from = sev_vm_move_enc_context_from,
- .can_emulate_instruction = svm_can_emulate_instruction,
+ .check_emulate_instruction = svm_check_emulate_instruction,
.apic_init_signal_blocked = svm_apic_init_signal_blocked,
generated by cgit v1.2.3 (git 2.39.0) at 2024-09-07 15:29:28 +0300