From: Sean Christopherson <seanjc@google.com>
To: Like Xu <like.xu.linux@gmail.com>
Cc: kvm@vger.kernel.org, linux-kernel@vger.kernel.org,
Paolo Bonzini <pbonzini@redhat.com>
Subject: Re: [PATCH v2 07/21] KVM: x86/pmu: Zero out LBR capabilities during PMU refresh
Date: Wed, 15 Feb 2023 07:17:13 -0800 [thread overview]
Message-ID: <Y+z2+5HPTRAa7+5i@google.com> (raw)
In-Reply-To: <73545081-0d82-fce6-43f0-c50aee9416cb@gmail.com>
On Wed, Feb 15, 2023, Like Xu wrote:
> On 10/2/2023 8:31 am, Sean Christopherson wrote:
> > Note, this is a very theoretical bug, there is no known use case where a
> > VMM would deliberately enable the vPMU via KVM_SET_CPUID2, and then later
> > disable the vPMU.
>
> That's why we're getting more and more comfortable with selftests
> and fuzz testing on KVM interfaces. So is there a test for this ?
Yep, last patch in the series, "KVM: selftests: Verify LBRs are disabled if vPMU
is disabled".
next prev parent reply other threads:[~2023-02-15 15:17 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-02-10 0:31 [PATCH v2 00/21] KVM: x86: Disallow writes to feature MSRs post-KVM_RUN Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 01/21] KVM: x86: Rename kvm_init_msr_list() to clarify it inits multiple lists Sean Christopherson
2023-02-14 6:34 ` Xiaoyao Li
2023-02-10 0:31 ` [PATCH v2 02/21] KVM: x86: Add a helper to query whether or not a vCPU has ever run Sean Christopherson
2023-02-14 6:35 ` Xiaoyao Li
2023-02-10 0:31 ` [PATCH v2 03/21] KVM: x86: Add macros to track first...last VMX feature MSRs Sean Christopherson
2023-02-14 10:48 ` Like Xu
2023-02-14 18:51 ` Sean Christopherson
2023-02-15 3:20 ` Xiaoyao Li
2023-02-10 0:31 ` [PATCH v2 04/21] KVM: x86: Generate set of VMX feature MSRs using first/last definitions Sean Christopherson
2023-02-14 6:36 ` Xiaoyao Li
2023-02-10 0:31 ` [PATCH v2 05/21] KVM: x86: Disallow writes to immutable feature MSRs after KVM_RUN Sean Christopherson
2023-02-10 13:01 ` Yu Zhang
2023-02-10 16:31 ` Sean Christopherson
2023-02-14 6:39 ` Xiaoyao Li
2023-02-14 11:39 ` Like Xu
2023-02-15 22:36 ` Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 06/21] KVM: x86/pmu: WARN and bug the VM if PMU is refreshed after vCPU has run Sean Christopherson
2023-02-15 11:53 ` Like Xu
2023-02-15 15:20 ` Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 07/21] KVM: x86/pmu: Zero out LBR capabilities during PMU refresh Sean Christopherson
2023-02-15 12:00 ` Like Xu
2023-02-15 15:17 ` Sean Christopherson [this message]
2023-02-10 0:31 ` [PATCH v2 08/21] KVM: selftests: Split PMU caps sub-tests to avoid writing MSR after KVM_RUN Sean Christopherson
2023-02-14 7:27 ` Like Xu
2023-02-14 17:42 ` Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 09/21] KVM: selftests: Move 0/initial value PERF_CAPS checks to dedicated sub-test Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 10/21] KVM: selftests: Assert that full-width PMC writes are supported if PDCM=1 Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 11/21] KVM: selftests: Print out failing MSR and value in vcpu_set_msr() Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 12/21] KVM: selftests: Verify KVM preserves userspace writes to "durable" MSRs Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 13/21] KVM: selftests: Drop now-redundant checks on PERF_CAPABILITIES writes Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 14/21] KVM: selftests: Test all fungible features in PERF_CAPABILITIES Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 15/21] KVM: selftests: Test all immutable non-format bits " Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 16/21] KVM: selftests: Expand negative testing of guest writes to PERF_CAPABILITIES Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 17/21] KVM: selftests: Test post-KVM_RUN " Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 18/21] KVM: selftests: Drop "all done!" printf() from PERF_CAPABILITIES test Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 19/21] KVM: selftests: Refactor LBR_FMT test to avoid use of separate macro Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 20/21] KVM: selftests: Add negative testcase for PEBS format in PERF_CAPABILITIES Sean Christopherson
2023-02-10 0:31 ` [PATCH v2 21/21] KVM: selftests: Verify LBRs are disabled if vPMU is disabled Sean Christopherson
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=Y+z2+5HPTRAa7+5i@google.com \
--to=seanjc@google.com \
--cc=kvm@vger.kernel.org \
--cc=like.xu.linux@gmail.com \
--cc=linux-kernel@vger.kernel.org \
--cc=pbonzini@redhat.com \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.