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authorJim Mattson <jmattson@google.com>2018-10-16 14:29:21 -0700
committerPaolo Bonzini <pbonzini@redhat.com>2018-10-17 19:07:42 +0200
commit91e86d225ef3da80d33a8fd7695316c31c0810c9 (patch)
tree5ea3217f5093514061ef42d6cf8557a2ed50ad96 /arch
parent59073aaf6de0d2dacc2603cee6d1d6cd5592ac08 (diff)
downloadlinux-91e86d225ef3da80d33a8fd7695316c31c0810c9.tar.bz2
kvm: x86: Add payload operands to kvm_multiple_exception
kvm_multiple_exception now takes two additional operands: has_payload and payload, so that updates to CR2 (and DR6 under VMX) can be delayed until the exception is delivered. This is necessary to properly emulate VMX or SVM hardware behavior for nested virtualization. The new behavior is triggered by vcpu->kvm->arch.exception_payload_enabled, which will (later) be set by a new per-VM capability, KVM_CAP_EXCEPTION_PAYLOAD. Reported-by: Jim Mattson <jmattson@google.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Signed-off-by: Jim Mattson <jmattson@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kvm/x86.c22
1 files changed, 15 insertions, 7 deletions
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2ef706574589..25a2bac920bb 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -402,7 +402,7 @@ static int exception_type(int vector)
static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
unsigned nr, bool has_error, u32 error_code,
- bool reinject)
+ bool has_payload, unsigned long payload, bool reinject)
{
u32 prev_nr;
int class1, class2;
@@ -424,6 +424,14 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
*/
WARN_ON_ONCE(vcpu->arch.exception.pending);
vcpu->arch.exception.injected = true;
+ if (WARN_ON_ONCE(has_payload)) {
+ /*
+ * A reinjected event has already
+ * delivered its payload.
+ */
+ has_payload = false;
+ payload = 0;
+ }
} else {
vcpu->arch.exception.pending = true;
vcpu->arch.exception.injected = false;
@@ -431,8 +439,8 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
vcpu->arch.exception.has_error_code = has_error;
vcpu->arch.exception.nr = nr;
vcpu->arch.exception.error_code = error_code;
- vcpu->arch.exception.has_payload = false;
- vcpu->arch.exception.payload = 0;
+ vcpu->arch.exception.has_payload = has_payload;
+ vcpu->arch.exception.payload = payload;
return;
}
@@ -468,13 +476,13 @@ static void kvm_multiple_exception(struct kvm_vcpu *vcpu,
void kvm_queue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
- kvm_multiple_exception(vcpu, nr, false, 0, false);
+ kvm_multiple_exception(vcpu, nr, false, 0, false, 0, false);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception);
void kvm_requeue_exception(struct kvm_vcpu *vcpu, unsigned nr)
{
- kvm_multiple_exception(vcpu, nr, false, 0, true);
+ kvm_multiple_exception(vcpu, nr, false, 0, false, 0, true);
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception);
@@ -521,13 +529,13 @@ EXPORT_SYMBOL_GPL(kvm_inject_nmi);
void kvm_queue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
- kvm_multiple_exception(vcpu, nr, true, error_code, false);
+ kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, false);
}
EXPORT_SYMBOL_GPL(kvm_queue_exception_e);
void kvm_requeue_exception_e(struct kvm_vcpu *vcpu, unsigned nr, u32 error_code)
{
- kvm_multiple_exception(vcpu, nr, true, error_code, true);
+ kvm_multiple_exception(vcpu, nr, true, error_code, false, 0, true);
}
EXPORT_SYMBOL_GPL(kvm_requeue_exception_e);