From: Peter Zijlstra <peterz@infradead.org>
To: Manali Shukla <manali.shukla@amd.com>
Cc: kvm@vger.kernel.org, seanjc@google.com,
linux-doc@vger.kernel.org, linux-perf-users@vger.kernel.org,
x86@kernel.org, pbonzini@redhat.com, bp@alien8.de,
santosh.shukla@amd.com, ravi.bangoria@amd.com,
thomas.lendacky@amd.com, nikunj@amd.com
Subject: Re: [PATCH 00/13] Implement support for IBS virtualization
Date: Fri, 8 Sep 2023 15:31:14 +0200 [thread overview]
Message-ID: <20230908133114.GK19320@noisy.programming.kicks-ass.net> (raw)
In-Reply-To: <188f7a79-ad47-eddd-a185-174e0970ad22@amd.com>
On Thu, Sep 07, 2023 at 09:19:51PM +0530, Manali Shukla wrote:
> > I'm not sure I'm fluent in virt speak (in fact, I'm sure I'm not). Is
> > the above saying that a host can never IBS profile a guest?
>
> Host can profile a guest with IBS if VIBS is disabled for the guest. This is
> the default behavior. Host can not profile guest if VIBS is enabled for guest.
>
> >
> > Does the current IBS thing assert perf_event_attr::exclude_guest is set?
>
> Unlike AMD core pmu, IBS doesn't have Host/Guest filtering capability, thus
> perf_event_open() fails if exclude_guest is set for an IBS event.
Then you must not allow VIBS if a host cpu-wide IBS counter exists.
Also, VIBS reads like it can be (ab)used as a filter.
next prev parent reply other threads:[~2023-09-08 13:31 UTC|newest]
Thread overview: 32+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-09-04 9:53 [PATCH 00/13] Implement support for IBS virtualization Manali Shukla
2023-09-04 9:53 ` [PATCH 01/13] KVM: Add KVM_GET_LAPIC_W_EXTAPIC and KVM_SET_LAPIC_W_EXTAPIC for extapic Manali Shukla
2023-09-12 1:47 ` Chao Gao
2023-09-04 9:53 ` [PATCH 02/13] x86/cpufeatures: Add CPUID feature bit for Extended LVT Manali Shukla
2023-09-04 9:53 ` [PATCH 03/13] KVM: x86: Add emulation support for Extented LVT registers Manali Shukla
2023-09-12 2:36 ` Chao Gao
2023-09-04 9:53 ` [PATCH 04/13] x86/cpufeatures: Add CPUID feature bit for virtualized IBS Manali Shukla
2023-09-04 9:53 ` [PATCH 05/13] KVM: x86/cpuid: Add a KVM-only leaf for IBS capabilities Manali Shukla
2023-09-04 9:53 ` [PATCH 06/13] KVM: x86: Extend CPUID range to include new leaf Manali Shukla
2023-09-12 2:46 ` Chao Gao
2023-09-04 9:53 ` [PATCH 07/13] KVM: SVM: Extend VMCB area for virtualized IBS registers Manali Shukla
2023-09-12 2:50 ` Chao Gao
2023-09-04 9:53 ` [PATCH 08/13] perf/x86/amd: Add framework to save/restore host IBS state Manali Shukla
2023-09-05 14:54 ` Tom Lendacky
2023-09-04 9:53 ` [PATCH 09/13] KVM: SVM: add support for IBS virtualization for non SEV-ES guests Manali Shukla
2023-09-05 15:30 ` Tom Lendacky
2023-09-06 1:51 ` Alexey Kardashevskiy
2023-09-12 3:09 ` Chao Gao
2023-09-04 9:53 ` [PATCH 10/13] x86/cpufeatures: Add CPUID feature bit for VIBS in SEV-ES guest Manali Shukla
2023-09-04 9:53 ` [PATCH 11/13] KVM: SVM: Add support for IBS virtualization for SEV-ES guests Manali Shukla
2023-09-05 15:43 ` Tom Lendacky
2023-09-04 9:53 ` [PATCH 12/13] KVM: SVM: Enable IBS virtualization on non SEV-ES and " Manali Shukla
2023-09-05 16:00 ` Tom Lendacky
2023-09-12 3:30 ` Chao Gao
2023-09-04 9:53 ` [PATCH 13/13] KVM: x86: nSVM: Implement support for nested IBS virtualization Manali Shukla
2023-09-05 15:47 ` [PATCH 00/13] Implement support for " Peter Zijlstra
2023-09-06 15:38 ` Manali Shukla
2023-09-06 19:56 ` Peter Zijlstra
2023-09-07 15:49 ` Manali Shukla
2023-09-08 13:31 ` Peter Zijlstra [this message]
2023-09-11 12:32 ` Manali Shukla
2023-09-28 11:18 ` Manali Shukla
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