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KVM: x86: Clean up and document nested #PF workaround 

Replace the per-vendor hack-a-fix for KVM's #PF => #PF => #DF workaround
with an explicit, common workaround in kvm_inject_emulated_page_fault().
Aside from being a hack, the current approach is brittle and incomplete,
e.g. nSVM's KVM_SET_NESTED_STATE fails to set ->inject_page_fault(),
and nVMX fails to apply the workaround when VMX is intercepting #PF due
to allow_smaller_maxphyaddr=1.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2022-03-03 20:20:17 -08:00 committed by Paolo Bonzini
parent 25cc05652c
commit 6819af7597
4 changed files with 37 additions and 19 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -1516,6 +1516,8 @@ struct kvm_x86_ops {
struct kvm_x86_nested_ops {
void (*leave_nested)(struct kvm_vcpu *vcpu);
int (*check_events)(struct kvm_vcpu *vcpu);
bool (*handle_page_fault_workaround)(struct kvm_vcpu *vcpu,
struct x86_exception *fault);
bool (*hv_timer_pending)(struct kvm_vcpu *vcpu);
void (*triple_fault)(struct kvm_vcpu *vcpu);
int (*get_state)(struct kvm_vcpu *vcpu,

18
arch/x86/kvm/svm/nested.c
View File

@ -55,24 +55,26 @@ static void nested_svm_inject_npf_exit(struct kvm_vcpu *vcpu,
nested_svm_vmexit(svm);
}
static void svm_inject_page_fault_nested(struct kvm_vcpu *vcpu, struct x86_exception *fault)
static bool nested_svm_handle_page_fault_workaround(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vcpu_svm *svm = to_svm(vcpu);
struct vmcb *vmcb = svm->vmcb;
WARN_ON(!is_guest_mode(vcpu));
WARN_ON(!is_guest_mode(vcpu));
if (vmcb12_is_intercept(&svm->nested.ctl,
INTERCEPT_EXCEPTION_OFFSET + PF_VECTOR) &&
!svm->nested.nested_run_pending) {
vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
!WARN_ON_ONCE(svm->nested.nested_run_pending)) {
vmcb->control.exit_code = SVM_EXIT_EXCP_BASE + PF_VECTOR;
vmcb->control.exit_code_hi = 0;
vmcb->control.exit_info_1 = fault->error_code;
vmcb->control.exit_info_2 = fault->address;
nested_svm_vmexit(svm);
} else {
kvm_inject_page_fault(vcpu, fault);
return true;
}
return false;
}
static u64 nested_svm_get_tdp_pdptr(struct kvm_vcpu *vcpu, int index)
@ -751,9 +753,6 @@ int enter_svm_guest_mode(struct kvm_vcpu *vcpu, u64 vmcb12_gpa,
if (ret)
return ret;
if (!npt_enabled)
vcpu->arch.mmu->inject_page_fault = svm_inject_page_fault_nested;
if (!from_vmrun)
kvm_make_request(KVM_REQ_GET_NESTED_STATE_PAGES, vcpu);
@ -1659,6 +1658,7 @@ static bool svm_get_nested_state_pages(struct kvm_vcpu *vcpu)
struct kvm_x86_nested_ops svm_nested_ops = {
.leave_nested = svm_leave_nested,
.check_events = svm_check_nested_events,
.handle_page_fault_workaround = nested_svm_handle_page_fault_workaround,
.triple_fault = nested_svm_triple_fault,
.get_nested_state_pages = svm_get_nested_state_pages,
.get_state = svm_get_nested_state,

15
arch/x86/kvm/vmx/nested.c
View File

@ -476,24 +476,23 @@ static int nested_vmx_check_exception(struct kvm_vcpu *vcpu, unsigned long *exit
return 0;
}
static void vmx_inject_page_fault_nested(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
static bool nested_vmx_handle_page_fault_workaround(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
struct vmcs12 *vmcs12 = get_vmcs12(vcpu);
WARN_ON(!is_guest_mode(vcpu));
if (nested_vmx_is_page_fault_vmexit(vmcs12, fault->error_code) &&
!to_vmx(vcpu)->nested.nested_run_pending) {
!WARN_ON_ONCE(to_vmx(vcpu)->nested.nested_run_pending)) {
vmcs12->vm_exit_intr_error_code = fault->error_code;
nested_vmx_vmexit(vcpu, EXIT_REASON_EXCEPTION_NMI,
PF_VECTOR | INTR_TYPE_HARD_EXCEPTION |
INTR_INFO_DELIVER_CODE_MASK | INTR_INFO_VALID_MASK,
fault->address);
} else {
kvm_inject_page_fault(vcpu, fault);
return true;
}
return false;
}
static int nested_vmx_check_io_bitmap_controls(struct kvm_vcpu *vcpu,
@ -2614,9 +2613,6 @@ static int prepare_vmcs02(struct kvm_vcpu *vcpu, struct vmcs12 *vmcs12,
vmcs_write64(GUEST_PDPTR3, vmcs12->guest_pdptr3);
}
if (!enable_ept)
vcpu->arch.walk_mmu->inject_page_fault = vmx_inject_page_fault_nested;
if ((vmcs12->vm_entry_controls & VM_ENTRY_LOAD_IA32_PERF_GLOBAL_CTRL) &&
WARN_ON_ONCE(kvm_set_msr(vcpu, MSR_CORE_PERF_GLOBAL_CTRL,
vmcs12->guest_ia32_perf_global_ctrl))) {
@ -6830,6 +6826,7 @@ __init int nested_vmx_hardware_setup(int (*exit_handlers[])(struct kvm_vcpu *))
struct kvm_x86_nested_ops vmx_nested_ops = {
.leave_nested = vmx_leave_nested,
.check_events = vmx_check_nested_events,
.handle_page_fault_workaround = nested_vmx_handle_page_fault_workaround,
.hv_timer_pending = nested_vmx_preemption_timer_pending,
.triple_fault = nested_vmx_triple_fault,
.get_state = vmx_get_nested_state,

21
arch/x86/kvm/x86.c
View File

@ -748,6 +748,7 @@ void kvm_inject_page_fault(struct kvm_vcpu *vcpu, struct x86_exception *fault)
}
EXPORT_SYMBOL_GPL(kvm_inject_page_fault);
/* Returns true if the page fault was immediately morphed into a VM-Exit. */
bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
struct x86_exception *fault)
{
@ -766,8 +767,26 @@ bool kvm_inject_emulated_page_fault(struct kvm_vcpu *vcpu,
kvm_mmu_invalidate_gva(vcpu, fault_mmu, fault->address,
fault_mmu->root.hpa);
/*
* A workaround for KVM's bad exception handling. If KVM injected an
* exception into L2, and L2 encountered a #PF while vectoring the
* injected exception, manually check to see if L1 wants to intercept
* #PF, otherwise queuing the #PF will lead to #DF or a lost exception.
* In all other cases, defer the check to nested_ops->check_events(),
* which will correctly handle priority (this does not). Note, other
* exceptions, e.g. #GP, are theoretically affected, #PF is simply the
* most problematic, e.g. when L0 and L1 are both intercepting #PF for
* shadow paging.
*
* TODO: Rewrite exception handling to track injected and pending
* (VM-Exit) exceptions separately.
*/
if (unlikely(vcpu->arch.exception.injected && is_guest_mode(vcpu)) &&
kvm_x86_ops.nested_ops->handle_page_fault_workaround(vcpu, fault))
return true;
fault_mmu->inject_page_fault(vcpu, fault);
return fault->nested_page_fault;
return false;
}
EXPORT_SYMBOL_GPL(kvm_inject_emulated_page_fault);