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From: Vitaly Kuznetsov <vkuznets@redhat.com>
To: kvm@vger.kernel.org
Cc: linux-kernel@vger.kernel.org,
	"Paolo Bonzini" <pbonzini@redhat.com>,
	"Radim Krčmář" <rkrcmar@redhat.com>,
	"Joerg Roedel" <joro@8bytes.org>,
	"Jim Mattson" <jmattson@google.com>
Subject: [PATCH 3/5] x86: KVM: svm: clear interrupt shadow on all paths in skip_emulated_instruction()
Date: Thu,  1 Aug 2019 07:14:16 +0200	[thread overview]
Message-ID: <20190801051418.15905-4-vkuznets@redhat.com> (raw)
In-Reply-To: <20190801051418.15905-1-vkuznets@redhat.com>

Regardless of the way how we skip instruction, interrupt shadow needs to be
cleared.

Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
---
 arch/x86/kvm/svm.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index 80f576e05112..7c7dff3f461f 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -784,13 +784,15 @@ static void skip_emulated_instruction(struct kvm_vcpu *vcpu)
 				EMULATE_DONE)
 			pr_err_once("KVM: %s: unable to skip instruction\n",
 				    __func__);
-		return;
+		goto clear_int_shadow;
 	}
 	if (svm->next_rip - kvm_rip_read(vcpu) > MAX_INST_SIZE)
 		printk(KERN_ERR "%s: ip 0x%lx next 0x%llx\n",
 		       __func__, kvm_rip_read(vcpu), svm->next_rip);
 
 	kvm_rip_write(vcpu, svm->next_rip);
+
+clear_int_shadow:
 	svm_set_interrupt_shadow(vcpu, 0);
 }
 
-- 
2.20.1


  parent reply	other threads:[~2019-08-01  5:14 UTC|newest]

Thread overview: 8+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2019-08-01  5:14 [PATCH 0/5] x86: KVM: svm: get rid of hardcoded instructions lengths Vitaly Kuznetsov
2019-08-01  5:14 ` [PATCH 1/5] x86: KVM: svm: don't pretend to advance RIP in case wrmsr_interception() results in #GP Vitaly Kuznetsov
2019-08-01  5:14 ` [PATCH 2/5] x86: KVM: svm: avoid flooding logs when skip_emulated_instruction() fails Vitaly Kuznetsov
2019-08-01  5:14 ` Vitaly Kuznetsov [this message]
2019-08-01 14:18   ` [PATCH 3/5] x86: KVM: svm: clear interrupt shadow on all paths in skip_emulated_instruction() Sean Christopherson
2019-08-01 14:43     ` Vitaly Kuznetsov
2019-08-01  5:14 ` [PATCH 4/5] x86: KVM: add xsetbv to the emulator Vitaly Kuznetsov
2019-08-01  5:14 ` [PATCH 5/5] x86: KVM: svm: remove hardcoded instruction length from intercepts Vitaly Kuznetsov

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