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From: Maxim Levitsky <mlevitsk@redhat.com>
To: kvm@vger.kernel.org
Cc: Sandipan Das <sandipan.das@amd.com>,
	Paolo Bonzini <pbonzini@redhat.com>,
	Jim Mattson <jmattson@google.com>,
	Peter Zijlstra <peterz@infradead.org>,
	Dave Hansen <dave.hansen@linux.intel.com>,
	Borislav Petkov <bp@alien8.de>,
	Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	Ingo Molnar <mingo@redhat.com>,
	Josh Poimboeuf <jpoimboe@kernel.org>,
	Daniel Sneddon <daniel.sneddon@linux.intel.com>,
	Jiaxi Chen <jiaxi.chen@linux.intel.com>,
	Babu Moger <babu.moger@amd.com>,
	linux-kernel@vger.kernel.org, Jing Liu <jing2.liu@intel.com>,
	Wyes Karny <wyes.karny@amd.com>,
	x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
	Sean Christopherson <seanjc@google.com>,
	Maxim Levitsky <mlevitsk@redhat.com>,
	Santosh Shukla <santosh.shukla@amd.com>
Subject: [PATCH v2 08/11] x86/cpu: Add CPUID feature bit for VNMI
Date: Tue, 29 Nov 2022 21:37:14 +0200	[thread overview]
Message-ID: <20221129193717.513824-9-mlevitsk@redhat.com> (raw)
In-Reply-To: <20221129193717.513824-1-mlevitsk@redhat.com>

From: Santosh Shukla <santosh.shukla@amd.com>

VNMI feature allows the hypervisor to inject NMI into the guest w/o
using Event injection mechanism, The benefit of using VNMI over the
event Injection that does not require tracking the Guest's NMI state and
intercepting the IRET for the NMI completion. VNMI achieves that by
exposing 3 capability bits in VMCB intr_cntrl which helps with
virtualizing NMI injection and NMI_Masking.

The presence of this feature is indicated via the CPUID function
0x8000000A_EDX[25].

Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
---
 arch/x86/include/asm/cpufeatures.h | 1 +
 1 file changed, 1 insertion(+)

diff --git a/arch/x86/include/asm/cpufeatures.h b/arch/x86/include/asm/cpufeatures.h
index 1419c4e04d45f3..ed50f28bdf235b 100644
--- a/arch/x86/include/asm/cpufeatures.h
+++ b/arch/x86/include/asm/cpufeatures.h
@@ -359,6 +359,7 @@
 #define X86_FEATURE_VGIF		(15*32+16) /* Virtual GIF */
 #define X86_FEATURE_X2AVIC		(15*32+18) /* Virtual x2apic */
 #define X86_FEATURE_V_SPEC_CTRL		(15*32+20) /* Virtual SPEC_CTRL */
+#define X86_FEATURE_AMD_VNMI		(15*32+25) /* Virtual NMI */
 #define X86_FEATURE_SVME_ADDR_CHK	(15*32+28) /* "" SVME addr check */
 
 /* Intel-defined CPU features, CPUID level 0x00000007:0 (ECX), word 16 */
-- 
2.26.3


  parent reply	other threads:[~2022-11-29 19:41 UTC|newest]

Thread overview: 66+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2022-11-29 19:37 [PATCH v2 00/11] SVM: vNMI (with my fixes) Maxim Levitsky
2022-11-29 19:37 ` [PATCH v2 01/11] KVM: nSVM: don't sync back tlb_ctl on nested VM exit Maxim Levitsky
2022-12-05 14:05   ` Santosh Shukla
2022-12-06 12:13     ` Maxim Levitsky
2022-11-29 19:37 ` [PATCH v2 02/11] KVM: nSVM: clean up the copying of V_INTR bits from vmcb02 to vmcb12 Maxim Levitsky
2023-01-28  0:37   ` Sean Christopherson
2023-01-31  1:44     ` Sean Christopherson
2023-02-24 14:38       ` Maxim Levitsky
2023-02-24 16:48         ` Sean Christopherson
2022-11-29 19:37 ` [PATCH v2 03/11] KVM: nSVM: explicitly raise KVM_REQ_EVENT on nested VM exit if L1 doesn't intercept interrupts Maxim Levitsky
2023-01-28  0:56   ` Sean Christopherson
2023-01-30 18:41     ` Sean Christopherson
2022-11-29 19:37 ` [PATCH v2 04/11] KVM: SVM: drop the SVM specific H_FLAGS Maxim Levitsky
2022-12-05 15:31   ` Santosh Shukla
2023-01-28  0:56   ` Sean Christopherson
2022-11-29 19:37 ` [PATCH v2 05/11] KVM: x86: emulator: stop using raw host flags Maxim Levitsky
2023-01-28  0:58   ` Sean Christopherson
2023-02-24 14:38     ` Maxim Levitsky
2022-11-29 19:37 ` [PATCH v2 06/11] KVM: SVM: add wrappers to enable/disable IRET interception Maxim Levitsky
2022-12-05 15:41   ` Santosh Shukla
2022-12-06 12:14     ` Maxim Levitsky
2022-12-08 12:09       ` Santosh Shukla
2022-12-08 13:44         ` Maxim Levitsky
2023-01-31 21:07           ` Sean Christopherson
2023-02-13 14:50             ` Santosh Shukla
2022-11-29 19:37 ` [PATCH v2 07/11] KVM: x86: add a delayed hardware NMI injection interface Maxim Levitsky
2023-01-28  1:09   ` Sean Christopherson
2023-01-31 21:12     ` Sean Christopherson
2023-02-08  9:35       ` Santosh Shukla
2023-02-08  9:32     ` Santosh Shukla
2023-02-24 14:39     ` Maxim Levitsky
2023-01-31 22:28   ` Sean Christopherson
2023-02-01  0:06     ` Sean Christopherson
2023-02-08  9:51       ` Santosh Shukla
2023-02-08 16:09         ` Sean Christopherson
2023-02-08  9:43     ` Santosh Shukla
2023-02-08 16:06       ` Sean Christopherson
2023-02-14 10:22         ` Santosh Shukla
2023-02-15 22:43           ` Sean Christopherson
2023-02-16  0:22             ` Sean Christopherson
2023-02-17  7:56               ` Santosh Shukla
2022-11-29 19:37 ` Maxim Levitsky [this message]
2022-11-29 19:37 ` [PATCH v2 09/11] KVM: SVM: Add VNMI bit definition Maxim Levitsky
2023-01-31 22:42   ` Sean Christopherson
2023-02-02  9:42     ` Santosh Shukla
2022-11-29 19:37 ` [PATCH v2 10/11] KVM: SVM: implement support for vNMI Maxim Levitsky
2022-12-04 17:18   ` Maxim Levitsky
2022-12-05 17:07   ` Santosh Shukla
2023-01-28  1:10   ` Sean Christopherson
2023-02-10 12:02     ` Santosh Shukla
2023-02-01  0:22   ` Sean Christopherson
2023-02-01  0:39     ` Sean Christopherson
2023-02-10 12:24     ` Santosh Shukla
2023-02-10 16:44       ` Sean Christopherson
2022-11-29 19:37 ` [PATCH v2 11/11] KVM: nSVM: implement support for nested VNMI Maxim Levitsky
2022-12-05 17:14   ` Santosh Shukla
2022-12-06 12:19     ` Maxim Levitsky
2022-12-08 12:11       ` Santosh Shukla
2023-02-01  0:44   ` Sean Christopherson
2022-12-06  9:58 ` [PATCH v2 00/11] SVM: vNMI (with my fixes) Santosh Shukla
2023-02-01  0:24   ` Sean Christopherson
2022-12-20 10:27 ` Maxim Levitsky
2022-12-21 18:44   ` Sean Christopherson
2023-01-15  9:05 ` Maxim Levitsky
2023-01-28  1:13 ` Sean Christopherson
2023-02-01 19:13 ` Sean Christopherson

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