Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled

[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]

Subject: Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
From: Paolo Bonzini <pbonzini@xxxxxxxxxx>
Date: Mon, 29 Jan 2024 15:40:28 +0100
Cc: Aaron Lewis <aaronlewis@xxxxxxxxxx>, "H. Peter Anvin" <hpa@xxxxxxxxx>, kvm@xxxxxxxxxxxxxxx, linux-kernel@xxxxxxxxxxxxxxx
In-reply-to: <CAL715WKMpui=+U56Qc5AiuLhUw_g-bjvtN5OmVz_hGdJmF1M5g@mail.gmail.com>
References: <20240124003858.3954822-1-mizhang@google.com> <20240124003858.3954822-2-mizhang@google.com> <ZbExcMMl-IAzJrfx@google.com> <CAAAPnDFAvJBuETUsBScX6WqSbf_j=5h_CpWwrPHwXdBxDg_LFQ@mail.gmail.com> <ZbGAXpFUso9JzIjo@google.com> <ZbGOK9m6UKkQ38bK@google.com> <ZbGUfmn-ZAe4lkiN@google.com> <ZbGn8lAj4XxiecFn@google.com> <ZbP7BTvdZ1-b3MmE@google.com> <CAL715WKMpui=+U56Qc5AiuLhUw_g-bjvtN5OmVz_hGdJmF1M5g@mail.gmail.com>
User-agent: Mozilla Thunderbird

On 1/26/24 20:30, Mingwei Zhang wrote:

Hrm, I don't hate it as a stopgap.  But if we are the only people that are affected,
because again I'm pretty sure QEMU is fine, I would rather we just fix things in
our VMM and/or internal kernel.

It is not just QEMU. crossvm is another open source VMM that suffers
from this one.


Can you explain the symptoms in both Google's internal VMM and crosvm?

Thanks,

Paolo

References:
- [PATCH 0/2] minor fix on perf_capabilities in KVM/x86
  - From: Mingwei Zhang
- [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Mingwei Zhang
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Sean Christopherson
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Aaron Lewis
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Sean Christopherson
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Mingwei Zhang
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Sean Christopherson
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Mingwei Zhang
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Sean Christopherson
- Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
  - From: Mingwei Zhang

Prev by Date: Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
Next by Date: Re: [PATCH v3 7/7] cpuidle/poll_state: replace cpu_relax with smp_cond_load_relaxed
Previous by thread: Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
Next by thread: Re: [PATCH 1/2] KVM: x86/pmu: Reset perf_capabilities in vcpu to 0 if PDCM is disabled
Index(es):
- Date
- Thread

[Index of Archives] [KVM ARM] [KVM ia64] [KVM ppc] [Virtualization Tools] [Spice Development] [Libvirt] [Libvirt Users] [Linux USB Devel] [Linux Audio Users] [Yosemite Questions] [Linux Kernel] [Linux SCSI] [XFree86]