linux-kernel - Re: [PATCH 5/5] KVM: x86/pmu: Hide guest counter updates from the VMRUN instruction

lists.openwall.net		lists / announce owl-users owl-dev john-users john-dev passwdqc-users yescrypt popa3d-users / oss-security kernel-hardening musl sabotage tlsify passwords / crypt-dev xvendor / Bugtraq Full-Disclosure linux-kernel linux-netdev linux-ext4 linux-hardening linux-cve-announce PHC
Open Source and information security mailing list archives

Hash Suite: Windows password security audit tool. GUI, reports in PDF.

[<prev] [next>] [<thread-prev] [thread-next>] [day] [month] [year] [list]

Message-ID: <7f3842a2-879b-2460-229e-745b7122b36a@gmail.com>
Date:   Mon, 29 May 2023 22:36:39 +0800
From:   Like Xu <like.xu.linux@...il.com>
To:     Jim Mattson <jmattson@...gle.com>,
        Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Ravi Bangoria <ravi.bangoria@....com>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: Re: [PATCH 5/5] KVM: x86/pmu: Hide guest counter updates from the
 VMRUN instruction

On 25/5/2023 5:30 am, Jim Mattson wrote:
> Note that there's a bug in the original code for this that has
> probably never been fixed: it ignores CMASK and INV in the PerfEvtSel.

Regarding the emulation of CMASK, INV and PIN_CONTROL bits on vPMU,
please forgive me for never having the right expectations (so there will be no
correct emulation), an share more *architecture* descriptions of those hw
behavior, and it would be great to have corresponding selftests as a bug report.