From 91e86d225ef3da80d33a8fd7695316c31c0810c9 Mon Sep 17 00:00:00 2001 From: Jim Mattson Date: Tue, 16 Oct 2018 14:29:21 -0700 Subject: 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 Suggested-by: Paolo Bonzini Signed-off-by: Jim Mattson Signed-off-by: Paolo Bonzini --- arch/x86/kvm/x86.c | 22 +++++++++++++++------- 1 file changed, 15 insertions(+), 7 deletions(-) (limited to 'arch') 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); -- cgit