linux-kernel - [RFC PATCH 10/19] KVM: SVM: Secure AVIC: Do not inject "Exceptions" for Secure AVIC

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Message-ID: <20250228085115.105648-11-Neeraj.Upadhyay@amd.com>
Date: Fri, 28 Feb 2025 14:21:06 +0530
From: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
To: <seanjc@...gle.com>, <pbonzini@...hat.com>, <kvm@...r.kernel.org>
CC: <linux-kernel@...r.kernel.org>, <bp@...en8.de>, <tglx@...utronix.de>,
	<mingo@...hat.com>, <dave.hansen@...ux.intel.com>, <Thomas.Lendacky@....com>,
	<nikunj@....com>, <Santosh.Shukla@....com>, <Vasant.Hegde@....com>,
	<Suravee.Suthikulpanit@....com>, <David.Kaplan@....com>, <x86@...nel.org>,
	<hpa@...or.com>, <peterz@...radead.org>, <huibo.wang@....com>,
	<naveen.rao@....com>, <binbin.wu@...ux.intel.com>, <isaku.yamahata@...el.com>
Subject: [RFC PATCH 10/19] KVM: SVM: Secure AVIC: Do not inject "Exceptions" for Secure AVIC

From: Kishon Vijay Abraham I <kvijayab@....com>

Secure AVIC does not support injecting "Exceptions" from hypervisor.
Return from svm_inject_exception() for Secure AVIC.

HW takes care of delivering exceptions initiated by guest as well as
re-injecting exceptions initiated by guest (in case there's an intercept
before delivering the exceptions). However exceptions cannot be
explicitly injected from Hypervisor when Secure AVIC is enabled.

Signed-off-by: Kishon Vijay Abraham I <kvijayab@....com>
Signed-off-by: Neeraj Upadhyay <Neeraj.Upadhyay@....com>
---
 arch/x86/kvm/svm/svm.c | 3 +++
 1 file changed, 3 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 7cfd6e916c74..58733b63bcd7 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -463,6 +463,9 @@ static void svm_inject_exception(struct kvm_vcpu *vcpu)
 	struct kvm_queued_exception *ex = &vcpu->arch.exception;
 	struct vcpu_svm *svm = to_svm(vcpu);
 
+	if (sev_savic_active(vcpu->kvm))
+		return;
+
 	kvm_deliver_exception_payload(vcpu, ex);
 
 	if (kvm_exception_is_soft(ex->vector) &&
-- 
2.34.1