summaryrefslogtreecommitdiffstats
path: root/arch/x86/kvm/svm/svm.c
diff options
context:
space:
mode:
Diffstat (limited to 'arch/x86/kvm/svm/svm.c')
-rw-r--r--arch/x86/kvm/svm/svm.c112
1 files changed, 70 insertions, 42 deletions
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index e90b429c84..4650153afa 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -99,6 +99,7 @@ static const struct svm_direct_access_msrs {
{ .index = MSR_IA32_SPEC_CTRL, .always = false },
{ .index = MSR_IA32_PRED_CMD, .always = false },
{ .index = MSR_IA32_FLUSH_CMD, .always = false },
+ { .index = MSR_IA32_DEBUGCTLMSR, .always = false },
{ .index = MSR_IA32_LASTBRANCHFROMIP, .always = false },
{ .index = MSR_IA32_LASTBRANCHTOIP, .always = false },
{ .index = MSR_IA32_LASTINTFROMIP, .always = false },
@@ -215,7 +216,7 @@ int vgif = true;
module_param(vgif, int, 0444);
/* enable/disable LBR virtualization */
-static int lbrv = true;
+int lbrv = true;
module_param(lbrv, int, 0444);
static int tsc_scaling = true;
@@ -703,7 +704,7 @@ static int svm_cpu_init(int cpu)
int ret = -ENOMEM;
memset(sd, 0, sizeof(struct svm_cpu_data));
- sd->save_area = alloc_page(GFP_KERNEL | __GFP_ZERO);
+ sd->save_area = snp_safe_alloc_page(NULL);
if (!sd->save_area)
return ret;
@@ -990,7 +991,7 @@ void svm_copy_lbrs(struct vmcb *to_vmcb, struct vmcb *from_vmcb)
vmcb_mark_dirty(to_vmcb, VMCB_LBR);
}
-static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
+void svm_enable_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -1000,6 +1001,9 @@ static void svm_enable_lbrv(struct kvm_vcpu *vcpu)
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTFROMIP, 1, 1);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTINTTOIP, 1, 1);
+ if (sev_es_guest(vcpu->kvm))
+ set_msr_interception(vcpu, svm->msrpm, MSR_IA32_DEBUGCTLMSR, 1, 1);
+
/* Move the LBR msrs to the vmcb02 so that the guest can see them. */
if (is_guest_mode(vcpu))
svm_copy_lbrs(svm->vmcb, svm->vmcb01.ptr);
@@ -1009,6 +1013,8 @@ static void svm_disable_lbrv(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
+ KVM_BUG_ON(sev_es_guest(vcpu->kvm), vcpu->kvm);
+
svm->vmcb->control.virt_ext &= ~LBR_CTL_ENABLE_MASK;
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHFROMIP, 0, 0);
set_msr_interception(vcpu, svm->msrpm, MSR_IA32_LASTBRANCHTOIP, 0, 0);
@@ -1421,7 +1427,7 @@ static int svm_vcpu_create(struct kvm_vcpu *vcpu)
svm = to_svm(vcpu);
err = -ENOMEM;
- vmcb01_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+ vmcb01_page = snp_safe_alloc_page(vcpu);
if (!vmcb01_page)
goto out;
@@ -1430,7 +1436,7 @@ static int svm_vcpu_create(struct kvm_vcpu *vcpu)
* SEV-ES guests require a separate VMSA page used to contain
* the encrypted register state of the guest.
*/
- vmsa_page = alloc_page(GFP_KERNEL_ACCOUNT | __GFP_ZERO);
+ vmsa_page = snp_safe_alloc_page(vcpu);
if (!vmsa_page)
goto error_free_vmcb_page;
@@ -1503,6 +1509,11 @@ static void svm_vcpu_free(struct kvm_vcpu *vcpu)
__free_pages(virt_to_page(svm->msrpm), get_order(MSRPM_SIZE));
}
+static struct sev_es_save_area *sev_es_host_save_area(struct svm_cpu_data *sd)
+{
+ return page_address(sd->save_area) + 0x400;
+}
+
static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
@@ -1519,12 +1530,8 @@ static void svm_prepare_switch_to_guest(struct kvm_vcpu *vcpu)
* or subsequent vmload of host save area.
*/
vmsave(sd->save_area_pa);
- if (sev_es_guest(vcpu->kvm)) {
- struct sev_es_save_area *hostsa;
- hostsa = (struct sev_es_save_area *)(page_address(sd->save_area) + 0x400);
-
- sev_es_prepare_switch_to_guest(hostsa);
- }
+ if (sev_es_guest(vcpu->kvm))
+ sev_es_prepare_switch_to_guest(sev_es_host_save_area(sd));
if (tsc_scaling)
__svm_write_tsc_multiplier(vcpu->arch.tsc_scaling_ratio);
@@ -2735,7 +2742,6 @@ static int dr_interception(struct kvm_vcpu *vcpu)
{
struct vcpu_svm *svm = to_svm(vcpu);
int reg, dr;
- unsigned long val;
int err = 0;
/*
@@ -2763,11 +2769,9 @@ static int dr_interception(struct kvm_vcpu *vcpu)
dr = svm->vmcb->control.exit_code - SVM_EXIT_READ_DR0;
if (dr >= 16) { /* mov to DRn */
dr -= 16;
- val = kvm_register_read(vcpu, reg);
- err = kvm_set_dr(vcpu, dr, val);
+ err = kvm_set_dr(vcpu, dr, kvm_register_read(vcpu, reg));
} else {
- kvm_get_dr(vcpu, dr, &val);
- kvm_register_write(vcpu, reg, val);
+ kvm_register_write(vcpu, reg, kvm_get_dr(vcpu, dr));
}
return kvm_complete_insn_gp(vcpu, err);
@@ -3455,7 +3459,7 @@ int svm_invoke_exit_handler(struct kvm_vcpu *vcpu, u64 exit_code)
if (!svm_check_exit_valid(exit_code))
return svm_handle_invalid_exit(vcpu, exit_code);
-#ifdef CONFIG_RETPOLINE
+#ifdef CONFIG_MITIGATION_RETPOLINE
if (exit_code == SVM_EXIT_MSR)
return msr_interception(vcpu);
else if (exit_code == SVM_EXIT_VINTR)
@@ -3845,16 +3849,27 @@ static void svm_enable_nmi_window(struct kvm_vcpu *vcpu)
struct vcpu_svm *svm = to_svm(vcpu);
/*
- * KVM should never request an NMI window when vNMI is enabled, as KVM
- * allows at most one to-be-injected NMI and one pending NMI, i.e. if
- * two NMIs arrive simultaneously, KVM will inject one and set
- * V_NMI_PENDING for the other. WARN, but continue with the standard
- * single-step approach to try and salvage the pending NMI.
+ * If NMIs are outright masked, i.e. the vCPU is already handling an
+ * NMI, and KVM has not yet intercepted an IRET, then there is nothing
+ * more to do at this time as KVM has already enabled IRET intercepts.
+ * If KVM has already intercepted IRET, then single-step over the IRET,
+ * as NMIs aren't architecturally unmasked until the IRET completes.
+ *
+ * If vNMI is enabled, KVM should never request an NMI window if NMIs
+ * are masked, as KVM allows at most one to-be-injected NMI and one
+ * pending NMI. If two NMIs arrive simultaneously, KVM will inject one
+ * NMI and set V_NMI_PENDING for the other, but if and only if NMIs are
+ * unmasked. KVM _will_ request an NMI window in some situations, e.g.
+ * if the vCPU is in an STI shadow or if GIF=0, KVM can't immediately
+ * inject the NMI. In those situations, KVM needs to single-step over
+ * the STI shadow or intercept STGI.
*/
- WARN_ON_ONCE(is_vnmi_enabled(svm));
+ if (svm_get_nmi_mask(vcpu)) {
+ WARN_ON_ONCE(is_vnmi_enabled(svm));
- if (svm_get_nmi_mask(vcpu) && !svm->awaiting_iret_completion)
- return; /* IRET will cause a vm exit */
+ if (!svm->awaiting_iret_completion)
+ return; /* IRET will cause a vm exit */
+ }
/*
* SEV-ES guests are responsible for signaling when a vCPU is ready to
@@ -4092,6 +4107,9 @@ static int svm_vcpu_pre_run(struct kvm_vcpu *vcpu)
static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
{
+ if (is_guest_mode(vcpu))
+ return EXIT_FASTPATH_NONE;
+
if (to_svm(vcpu)->vmcb->control.exit_code == SVM_EXIT_MSR &&
to_svm(vcpu)->vmcb->control.exit_info_1)
return handle_fastpath_set_msr_irqoff(vcpu);
@@ -4101,6 +4119,7 @@ static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu, bool spec_ctrl_intercepted)
{
+ struct svm_cpu_data *sd = per_cpu_ptr(&svm_data, vcpu->cpu);
struct vcpu_svm *svm = to_svm(vcpu);
guest_state_enter_irqoff();
@@ -4108,19 +4127,21 @@ static noinstr void svm_vcpu_enter_exit(struct kvm_vcpu *vcpu, bool spec_ctrl_in
amd_clear_divider();
if (sev_es_guest(vcpu->kvm))
- __svm_sev_es_vcpu_run(svm, spec_ctrl_intercepted);
+ __svm_sev_es_vcpu_run(svm, spec_ctrl_intercepted,
+ sev_es_host_save_area(sd));
else
__svm_vcpu_run(svm, spec_ctrl_intercepted);
guest_state_exit_irqoff();
}
-static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
+static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu,
+ bool force_immediate_exit)
{
struct vcpu_svm *svm = to_svm(vcpu);
bool spec_ctrl_intercepted = msr_write_intercepted(vcpu, MSR_IA32_SPEC_CTRL);
- trace_kvm_entry(vcpu);
+ trace_kvm_entry(vcpu, force_immediate_exit);
svm->vmcb->save.rax = vcpu->arch.regs[VCPU_REGS_RAX];
svm->vmcb->save.rsp = vcpu->arch.regs[VCPU_REGS_RSP];
@@ -4139,9 +4160,12 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
* is enough to force an immediate vmexit.
*/
disable_nmi_singlestep(svm);
- smp_send_reschedule(vcpu->cpu);
+ force_immediate_exit = true;
}
+ if (force_immediate_exit)
+ smp_send_reschedule(vcpu->cpu);
+
pre_svm_run(vcpu);
sync_lapic_to_cr8(vcpu);
@@ -4237,9 +4261,6 @@ static __no_kcsan fastpath_t svm_vcpu_run(struct kvm_vcpu *vcpu)
svm_complete_interrupts(vcpu);
- if (is_guest_mode(vcpu))
- return EXIT_FASTPATH_NONE;
-
return svm_exit_handlers_fastpath(vcpu);
}
@@ -4900,6 +4921,16 @@ static int svm_vm_init(struct kvm *kvm)
return 0;
}
+static void *svm_alloc_apic_backing_page(struct kvm_vcpu *vcpu)
+{
+ struct page *page = snp_safe_alloc_page(vcpu);
+
+ if (!page)
+ return NULL;
+
+ return page_address(page);
+}
+
static struct kvm_x86_ops svm_x86_ops __initdata = {
.name = KBUILD_MODNAME,
@@ -4997,8 +5028,6 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.check_intercept = svm_check_intercept,
.handle_exit_irqoff = svm_handle_exit_irqoff,
- .request_immediate_exit = __kvm_request_immediate_exit,
-
.sched_in = svm_sched_in,
.nested_ops = &svm_nested_ops,
@@ -5031,6 +5060,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
.vcpu_deliver_sipi_vector = svm_vcpu_deliver_sipi_vector,
.vcpu_get_apicv_inhibit_reasons = avic_vcpu_get_apicv_inhibit_reasons,
+ .alloc_apic_backing_page = svm_alloc_apic_backing_page,
};
/*
@@ -5236,6 +5266,12 @@ static __init int svm_hardware_setup(void)
nrips = nrips && boot_cpu_has(X86_FEATURE_NRIPS);
+ if (lbrv) {
+ if (!boot_cpu_has(X86_FEATURE_LBRV))
+ lbrv = false;
+ else
+ pr_info("LBR virtualization supported\n");
+ }
/*
* Note, SEV setup consumes npt_enabled and enable_mmio_caching (which
* may be modified by svm_adjust_mmio_mask()), as well as nrips.
@@ -5289,14 +5325,6 @@ static __init int svm_hardware_setup(void)
svm_x86_ops.set_vnmi_pending = NULL;
}
-
- if (lbrv) {
- if (!boot_cpu_has(X86_FEATURE_LBRV))
- lbrv = false;
- else
- pr_info("LBR virtualization supported\n");
- }
-
if (!enable_pmu)
pr_info("PMU virtualization is disabled\n");
generated by cgit v1.2.3 (git 2.39.1) at 2024-09-24 17:27:18 +0000