From: Manali Shukla <manali.shukla@amd.com>
To: Nikunj A Dadhania <nikunj@amd.com>
Cc: <seanjc@google.com>, <pbonzini@redhat.com>, <bp@alien8.de>,
<peterz@infradead.org>, <mingo@redhat.com>, <mizhang@google.com>,
<thomas.lendacky@amd.com>, <ravi.bangoria@amd.com>,
<Sandipan.Das@amd.com>, <kvm@vger.kernel.org>,
<linux-perf-users@vger.kernel.org>, <linux-doc@vger.kernel.org>
Subject: Re: [PATCH v2 06/12] x86/cpufeatures: Add CPUID feature bit for VIBS in SVM/SEV guests
Date: Wed, 17 Sep 2025 21:10:08 +0530 [thread overview]
Message-ID: <00d97fad-f67a-47c4-a829-fb7295dc6d19@amd.com> (raw)
In-Reply-To: <85v7lq31hd.fsf@amd.com>
On 9/10/2025 6:31 PM, Nikunj A Dadhania wrote:
> Manali Shukla <manali.shukla@amd.com> writes:
>
>> From: Santosh Shukla <santosh.shukla@amd.com>
>>
>> The virtualized IBS (VIBS) feature allows the guest to collect IBS
>> samples without exiting the guest.
>>
>> Presence of the VIBS feature is indicated via CPUID function
>> 0x8000000A_EDX[26].
>>
>> Signed-off-by: Santosh Shukla <santosh.shukla@amd.com>
>> Signed-off-by: Manali Shukla <manali.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 0dd44cbf7196..3c31dea00671 100644
>> --- a/arch/x86/include/asm/cpufeatures.h
>> +++ b/arch/x86/include/asm/cpufeatures.h
>> @@ -379,6 +379,7 @@
>> #define X86_FEATURE_V_SPEC_CTRL (15*32+20) /* "v_spec_ctrl" Virtual SPEC_CTRL */
>> #define X86_FEATURE_VNMI (15*32+25) /* "vnmi" Virtual NMI */
>> #define X86_FEATURE_EXTLVT (15*32+27) /* Extended Local vector Table */
>> +#define X86_FEATURE_VIBS (15*32+26) /* Virtual IBS */
>
> Please move before EXTLVT to maintain bit position order
>
> Regards,
> Nikunj
Ack, will fix it up in V3.
-Manali
>
>> #define X86_FEATURE_SVME_ADDR_CHK (15*32+28) /* SVME addr check */
>> #define X86_FEATURE_BUS_LOCK_THRESHOLD (15*32+29) /* Bus lock threshold */
>> #define X86_FEATURE_IDLE_HLT (15*32+30) /* IDLE HLT intercept */
>> --
>> 2.43.0
next prev parent reply other threads:[~2025-09-17 15:40 UTC|newest]
Thread overview: 26+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-09-01 5:16 [PATCH v2 00/12] Implement support for IBS virtualization Manali Shukla
2025-09-01 5:19 ` [PATCH v2 01/12] perf/amd/ibs: Fix race condition in IBS Manali Shukla
2025-09-01 5:21 ` [PATCH v2 02/12] KVM: x86: Refactor APIC register mask handling to support extended APIC registers Manali Shukla
2025-10-06 16:12 ` Naveen N Rao
2025-10-13 5:53 ` Manali Shukla
2025-09-01 5:21 ` [PATCH v2 03/12] KVM: Add KVM_GET_EXT_LAPIC and KVM_SET_EXT_LAPIC for extapic Manali Shukla
2025-09-01 5:22 ` [PATCH v2 04/12] x86/cpufeatures: Add CPUID feature bit for Extended LVT Manali Shukla
2025-09-08 13:39 ` Naveen N Rao
2025-09-17 15:34 ` Manali Shukla
2025-10-08 6:58 ` Naveen N Rao
2025-10-13 5:36 ` Manali Shukla
2025-09-01 5:22 ` [PATCH v2 05/12] KVM: x86: Add emulation support for Extented LVT registers Manali Shukla
2025-09-08 13:41 ` Naveen N Rao
2025-09-17 12:57 ` Manali Shukla
2025-10-08 7:00 ` Naveen N Rao
2025-10-13 5:38 ` Manali Shukla
2025-09-01 5:23 ` [PATCH v2 06/12] x86/cpufeatures: Add CPUID feature bit for VIBS in SVM/SEV guests Manali Shukla
2025-09-10 13:01 ` Nikunj A Dadhania
2025-09-17 15:40 ` Manali Shukla [this message]
2025-09-01 5:23 ` [PATCH v2 07/12] KVM: x86/cpuid: Add a KVM-only leaf for IBS capabilities Manali Shukla
2025-09-01 5:24 ` [PATCH v2 08/12] KVM: x86: Extend CPUID range to include new leaf Manali Shukla
2025-09-01 5:24 ` [PATCH v2 09/12] KVM: SVM: Extend VMCB area for virtualized IBS registers Manali Shukla
2025-09-01 5:25 ` [PATCH v2 10/12] KVM: SVM: Add support for IBS Virtualization Manali Shukla
2025-10-08 7:30 ` Naveen N Rao
2025-09-01 5:26 ` [PATCH v2 11/12] perf/x86/amd: Enable VPMU passthrough capability for IBS PMU Manali Shukla
2025-09-01 5:26 ` [PATCH v2 12/12] perf/x86/amd: Remove exclude_guest check from perf_ibs_init() Manali Shukla
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