linux-kernel - [RFC PATCH v3 19/19] KVM: x86: nSVM: expose the nested AVIC to the guest

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Date:   Wed, 27 Apr 2022 23:03:14 +0300
From:   Maxim Levitsky <mlevitsk@...hat.com>
To:     kvm@...r.kernel.org
Cc:     Wanpeng Li <wanpengli@...cent.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Jani Nikula <jani.nikula@...ux.intel.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Tvrtko Ursulin <tvrtko.ursulin@...ux.intel.com>,
        Rodrigo Vivi <rodrigo.vivi@...el.com>,
        Zhenyu Wang <zhenyuw@...ux.intel.com>,
        Joonas Lahtinen <joonas.lahtinen@...ux.intel.com>,
        Tom Lendacky <thomas.lendacky@....com>,
        Ingo Molnar <mingo@...hat.com>,
        David Airlie <airlied@...ux.ie>,
        Thomas Gleixner <tglx@...utronix.de>,
        Dave Hansen <dave.hansen@...ux.intel.com>, x86@...nel.org,
        intel-gfx@...ts.freedesktop.org,
        Sean Christopherson <seanjc@...gle.com>,
        Daniel Vetter <daniel@...ll.ch>,
        Borislav Petkov <bp@...en8.de>, Joerg Roedel <joro@...tes.org>,
        linux-kernel@...r.kernel.org, Jim Mattson <jmattson@...gle.com>,
        Zhi Wang <zhi.a.wang@...el.com>,
        Brijesh Singh <brijesh.singh@....com>,
        "H. Peter Anvin" <hpa@...or.com>,
        intel-gvt-dev@...ts.freedesktop.org,
        dri-devel@...ts.freedesktop.org,
        Maxim Levitsky <mlevitsk@...hat.com>
Subject: [RFC PATCH v3 19/19] KVM: x86: nSVM: expose the nested AVIC to the guest

This patch enables and exposes to the nested guest
the support for the nested AVIC.

Signed-off-by: Maxim Levitsky <mlevitsk@...hat.com>
---
 arch/x86/kvm/svm/svm.c | 6 ++++++
 1 file changed, 6 insertions(+)

diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 099329711ad13..431281ccc40ef 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -4087,6 +4087,9 @@ static void svm_vcpu_after_set_cpuid(struct kvm_vcpu *vcpu)
 		if (guest_cpuid_has(vcpu, X86_FEATURE_X2APIC))
 			kvm_set_apicv_inhibit(kvm, APICV_INHIBIT_REASON_X2APIC);
 	}
+
+	svm->avic_enabled = enable_apicv && guest_cpuid_has(vcpu, X86_FEATURE_AVIC);
+
 	init_vmcb_after_set_cpuid(vcpu);
 }
 
@@ -4827,6 +4830,9 @@ static __init void svm_set_cpu_caps(void)
 		if (vgif)
 			kvm_cpu_cap_set(X86_FEATURE_VGIF);
 
+		if (enable_apicv)
+			kvm_cpu_cap_set(X86_FEATURE_AVIC);
+
 		/* Nested VM can receive #VMEXIT instead of triggering #GP */
 		kvm_cpu_cap_set(X86_FEATURE_SVME_ADDR_CHK);
 	}
-- 
2.26.3