linux-kernel - [PATCH 5.5 357/367] KVM: nVMX: vmread should not set rflags to specify success in case of #PF

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Message-Id: <20200210122455.380067506@linuxfoundation.org>
Date:   Mon, 10 Feb 2020 04:34:30 -0800
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Liran Alon <liran.alon@...cle.com>,
        Miaohe Lin <linmiaohe@...wei.com>,
        Sean Christopherson <sean.j.christopherson@...el.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Sasha Levin <sashal@...nel.org>
Subject: [PATCH 5.5 357/367] KVM: nVMX: vmread should not set rflags to specify success in case of #PF

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

[ Upstream commit a4d956b9390418623ae5d07933e2679c68b6f83c ]

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>
Cc: stable@...r.kernel.org
Reviewed-by: Sean Christopherson <sean.j.christopherson@...el.com>
Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 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 4aea7d304bebd..5bfa8228f0c74 100644
--- a/arch/x86/kvm/vmx/nested.c
+++ b/arch/x86/kvm/vmx/nested.c
@@ -4807,8 +4807,10 @@ static int handle_vmread(struct kvm_vcpu *vcpu)
 				vmx_instruction_info, true, len, &gva))
 			return 1;
 		/* _system ok, nested_vmx_check_permission has verified cpl=0 */
-		if (kvm_write_guest_virt_system(vcpu, gva, &field_value, len, &e))
+		if (kvm_write_guest_virt_system(vcpu, gva, &field_value, len, &e)) {
 			kvm_inject_page_fault(vcpu, &e);
+			return 1;
+		}
 	}
 
 	return nested_vmx_succeed(vcpu);
-- 
2.20.1