linux-kernel - [PATCHv5 7/8] KVM: nSVM: emulate VMEXIT

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <20221027083831.2985-8-santosh.shukla@amd.com>
Date:   Thu, 27 Oct 2022 14:08:30 +0530
From:   Santosh Shukla <santosh.shukla@....com>
To:     <pbonzini@...hat.com>, <seanjc@...gle.com>
CC:     <kvm@...r.kernel.org>, <jmattson@...gle.com>, <joro@...tes.org>,
        <linux-kernel@...r.kernel.org>, <mail@...iej.szmigiero.name>,
        <mlevitsk@...hat.com>, <thomas.lendacky@....com>,
        <vkuznets@...hat.com>
Subject: [PATCHv5 7/8] KVM: nSVM: emulate VMEXIT_INVALID case for nested VNMI

If NMI virtualization enabled and NMI_INTERCEPT is unset then next vm
entry will exit with #INVALID exit reason.

In order to emulate above (VMEXIT(#INVALID)) scenario for nested
environment, extending check for V_NMI_ENABLE, NMI_INTERCEPT bit in func
__nested_vmcb_check_controls.

Signed-off-by: Santosh Shukla <santosh.shukla@....com>
---
 arch/x86/kvm/svm/nested.c | 5 +++++
 1 file changed, 5 insertions(+)

diff --git a/arch/x86/kvm/svm/nested.c b/arch/x86/kvm/svm/nested.c
index d1c22c89427e..e94ec6dee661 100644
--- a/arch/x86/kvm/svm/nested.c
+++ b/arch/x86/kvm/svm/nested.c
@@ -274,6 +274,11 @@ static bool __nested_vmcb_check_controls(struct kvm_vcpu *vcpu,
 	if (CC(!nested_svm_check_tlb_ctl(vcpu, control->tlb_ctl)))
 		return false;
 
+	if (CC((control->int_ctl & V_NMI_ENABLE) &&
+		!vmcb12_is_intercept(control, INTERCEPT_NMI))) {
+		return false;
+	}
+
 	return true;
 }
 
-- 
2.25.1