[PATCH 1/3] KVM: SVM: Get rid of handle_fastpath_set_msr_irqoff()

[Wanpeng Li]

From: Wanpeng Li <wanpengli@xxxxxxxxxxx>

Analysis from Sean:

 | svm->next_rip is reset in svm_vcpu_run() only after calling 
 | svm_exit_handlers_fastpath(), which will cause SVM's 
 | skip_emulated_instruction() to write a stale RIP.
 
Let's get rid of handle_fastpath_set_msr_irqoff() in svm_exit_handlers_fastpath()
to have a quick fix.

Reported-by: Paul K. <kronenpj@xxxxxxxxxxxxxxxxxxx>
Suggested-by: Sean Christopherson <sean.j.christopherson@xxxxxxxxx>
Cc: Paul K. <kronenpj@xxxxxxxxxxxxxxxxxxx>
Cc: <stable@xxxxxxxxxxxxxxx> # v5.8-rc1+
Fixes: 404d5d7bff0d (KVM: X86: Introduce more exit_fastpath_completion enum values)
Signed-off-by: Wanpeng Li <wanpengli@xxxxxxxxxxx>
---
 arch/x86/kvm/svm/svm.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 19e622a..c61bc3b 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3349,11 +3349,6 @@ static void svm_cancel_injection(struct kvm_vcpu *vcpu)
 
 static fastpath_t svm_exit_handlers_fastpath(struct kvm_vcpu *vcpu)
 {
-	if (!is_guest_mode(vcpu) &&
-	    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);
-
 	return EXIT_FASTPATH_NONE;
 }
 
-- 
2.7.4