From: Sean Christopherson <seanjc@google.com>
To: Dave Hansen <dave.hansen@intel.com>
Cc: Amit Shah <amit@kernel.org>,
linux-kernel@vger.kernel.org, kvm@vger.kernel.org,
x86@kernel.org, linux-doc@vger.kernel.org,
thomas.lendacky@amd.com, bp@alien8.de, tglx@linutronix.de,
peterz@infradead.org, jpoimboe@kernel.org,
pawan.kumar.gupta@linux.intel.com, corbet@lwn.net,
mingo@redhat.com, dave.hansen@linux.intel.com, hpa@zytor.com,
pbonzini@redhat.com, daniel.sneddon@linux.intel.com,
kai.huang@intel.com, sandipan.das@amd.com,
boris.ostrovsky@oracle.com, Babu.Moger@amd.com,
david.kaplan@amd.com, dwmw@amazon.co.uk,
andrew.cooper3@citrix.com, Amit Shah <Amit.Shah@amd.com>
Subject: Re: [RFC PATCH v3 1/2] x86: cpu/bugs: add AMD ERAPS support; hardware flushes RSB
Date: Mon, 2 Dec 2024 10:36:05 -0800 [thread overview]
Message-ID: <Z03-FSa6nvVbFjwc@google.com> (raw)
In-Reply-To: <0dd91e39-c4b7-4740-b469-6f71e48b72de@intel.com>
On Mon, Dec 02, 2024, Dave Hansen wrote:
> On 12/2/24 10:09, Amit Shah wrote:
> > I can still include the summary of the discussion in this patch - I
> > just feel it isn't necessary with the rework.
>
> It's necessary.
>
> There's a new hardware feature. You want it to replace a software
> sequence in certain situations. You have to make an actual, coherent
> argument argument as to why the hardware feature is a suitable replacement.
>
> For instance (and I'm pretty sure we've gone over this more than once),
> the changelog here still makes the claim that a "context switch" and a
> "mov-to-CR3" are the same thing.
+1000. I want a crisp, precise description of the actual hardware behavior, so
that KVM can do the right thing when virtualizing ERAPS.
next prev parent reply other threads:[~2024-12-02 18:36 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <cover.1732219175.git.jpoimboe@kernel.org>
2024-11-28 13:28 ` [RFC PATCH v3 0/2] Add support for the ERAPS feature Amit Shah
2024-11-28 13:28 ` [RFC PATCH v3 1/2] x86: cpu/bugs: add AMD ERAPS support; hardware flushes RSB Amit Shah
2024-12-02 17:26 ` Dave Hansen
2024-12-02 18:09 ` Amit Shah
2024-12-02 18:25 ` Dave Hansen
2024-12-02 18:36 ` Sean Christopherson [this message]
2024-11-28 13:28 ` [RFC PATCH v3 2/2] x86: kvm: svm: advertise ERAPS (larger RSB) support to guests Amit Shah
2024-12-02 18:30 ` Sean Christopherson
2025-03-27 11:10 ` Shah, Amit
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=Z03-FSa6nvVbFjwc@google.com \
--to=seanjc@google.com \
--cc=Amit.Shah@amd.com \
--cc=Babu.Moger@amd.com \
--cc=amit@kernel.org \
--cc=andrew.cooper3@citrix.com \
--cc=boris.ostrovsky@oracle.com \
--cc=bp@alien8.de \
--cc=corbet@lwn.net \
--cc=daniel.sneddon@linux.intel.com \
--cc=dave.hansen@intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=david.kaplan@amd.com \
--cc=dwmw@amazon.co.uk \
--cc=hpa@zytor.com \
--cc=jpoimboe@kernel.org \
--cc=kai.huang@intel.com \
--cc=kvm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=mingo@redhat.com \
--cc=pawan.kumar.gupta@linux.intel.com \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=sandipan.das@amd.com \
--cc=tglx@linutronix.de \
--cc=thomas.lendacky@amd.com \
--cc=x86@kernel.org \
/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 a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).