linux-kernel - [PATCH v2] KVM: nVMX: vmread should not set rflags to specify success in case of #PF

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Date:   Sat, 28 Dec 2019 14:25:24 +0800
From:   linmiaohe <linmiaohe@...wei.com>
To:     <pbonzini@...hat.com>, <rkrcmar@...hat.com>,
        <sean.j.christopherson@...el.com>, <vkuznets@...hat.com>,
        <wanpengli@...cent.com>, <jmattson@...gle.com>, <joro@...tes.org>,
        <tglx@...utronix.de>, <mingo@...hat.com>, <bp@...en8.de>,
        <hpa@...or.com>
CC:     <linmiaohe@...wei.com>, <liran.alon@...cle.com>,
        <kvm@...r.kernel.org>, <linux-kernel@...r.kernel.org>,
        <x86@...nel.org>
Subject: [PATCH v2] KVM: nVMX: vmread should not set rflags to specify success in case of #PF

From: Miaohe Lin <linmiaohe@...wei.com>

In case writing to vmread destination operand result in a #PF, vmread
should not call nested_vmx_succeed() to set rflags to specify success.
Similar to as done in VMPTRST (See handle_vmptrst()).

Reviewed-by: Liran Alon <liran.alon@...cle.com>
Signed-off-by: Miaohe Lin <linmiaohe@...wei.com>
---
v2:
	rephrase commit title & message
---
 arch/x86/kvm/vmx/nested.c | 4 +++-
 1 file changed, 3 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/vmx/nested.c b/arch/x86/kvm/vmx/nested.c
index 8edefdc9c0cb..c1ec9f25a417 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4799,8 +4799,10 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
 					instr_info, true, len, &gva))
 			return 1;
 		/* _system ok, nested_vmx_check_permission has verified cpl=0 */
-		if (kvm_write_guest_virt_system(vcpu, gva, &value, len, &e))
+		if (kvm_write_guest_virt_system(vcpu, gva, &value, len, &e)) {
 			kvm_inject_page_fault(vcpu, &e);
+			return 1;
+		}
 	}
 
 	return nested_vmx_succeed(vcpu);
-- 
2.19.1