From: "Bae, Chang Seok" <chang.seok.bae@intel.com>
To: Borislav Petkov <bp@suse.de>
Cc: Andy Lutomirski <luto@kernel.org>,
"tglx@linutronix.de" <tglx@linutronix.de>,
"mingo@kernel.org" <mingo@kernel.org>,
"x86@kernel.org" <x86@kernel.org>,
"Brown, Len" <len.brown@intel.com>,
"Hansen, Dave" <dave.hansen@intel.com>,
"Liu, Jing2" <jing2.liu@intel.com>,
"Shankar, Ravi V" <ravi.v.shankar@intel.com>,
"linux-kernel@vger.kernel.org" <linux-kernel@vger.kernel.org>,
"kvm@vger.kernel.org" <kvm@vger.kernel.org>
Subject: Re: [PATCH v3 10/21] x86/fpu/xstate: Update xstate save function to support dynamic xstate
Date: Tue, 9 Feb 2021 15:48:42 +0000 [thread overview]
Message-ID: <F16A56D8-803E-4B9C-BAA0-B16753BB273C@intel.com> (raw)
In-Reply-To: <20210208123359.GG17908@zn.tnic>
On Feb 8, 2021, at 04:33, Borislav Petkov <bp@suse.de> wrote:
> On Wed, Dec 23, 2020 at 07:57:06AM -0800, Chang S. Bae wrote:
>> copy_xregs_to_kernel() used to save all user states in a kernel buffer.
>> When the dynamic user state is enabled, it becomes conditional which state
>> to be saved.
>>
>> fpu->state_mask can indicate which state components are reserved to be
>> saved in XSAVE buffer. Use it as XSAVE's instruction mask to select states.
>>
>> KVM used to save all xstate via copy_xregs_to_kernel(). Update KVM to set a
>> valid fpu->state_mask, which will be necessary to correctly handle dynamic
>> state buffers.
>
> All this commit message should say is something along the lines of
> "extend copy_xregs_to_kernel() to receive a mask argument of which
> states to save, in preparation of dynamic states handling."
Yes, I will change like that. Thanks.
>> No functional change until the kernel supports dynamic user states.
>
> Same comment as before.
This needs to be removed as per your comment [1].
Chang
[1] https://lore.kernel.org/lkml/20210209124906.GC15909@zn.tnic/
prev parent reply other threads:[~2021-02-09 15:49 UTC|newest]
Thread overview: 20+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20201223155717.19556-1-chang.seok.bae@intel.com>
2020-12-23 15:56 ` [PATCH v3 01/21] x86/fpu/xstate: Modify initialization helper to handle both static and dynamic buffers Chang S. Bae
2021-01-15 12:40 ` Borislav Petkov
2020-12-23 15:56 ` [PATCH v3 03/21] x86/fpu/xstate: Modify address finders " Chang S. Bae
2021-01-15 13:06 ` Borislav Petkov
2020-12-23 15:57 ` [PATCH v3 04/21] x86/fpu/xstate: Modify context switch helpers " Chang S. Bae
2021-01-15 13:18 ` Borislav Petkov
2021-01-19 18:49 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 06/21] x86/fpu/xstate: Calculate and remember dynamic xstate buffer sizes Chang S. Bae
2021-01-22 11:44 ` Borislav Petkov
2021-01-27 1:23 ` Bae, Chang Seok
2021-01-27 9:38 ` Borislav Petkov
2021-02-03 2:54 ` Bae, Chang Seok
2020-12-23 15:57 ` [PATCH v3 10/21] x86/fpu/xstate: Update xstate save function to support dynamic xstate Chang S. Bae
2021-01-07 8:41 ` Liu, Jing2
2021-01-07 18:40 ` Bae, Chang Seok
2021-01-12 2:52 ` Liu, Jing2
2021-01-15 4:59 ` Bae, Chang Seok
2021-01-15 5:45 ` Liu, Jing2
2021-02-08 12:33 ` Borislav Petkov
2021-02-09 15:48 ` Bae, Chang Seok [this message]
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=F16A56D8-803E-4B9C-BAA0-B16753BB273C@intel.com \
--to=chang.seok.bae@intel.com \
--cc=bp@suse.de \
--cc=dave.hansen@intel.com \
--cc=jing2.liu@intel.com \
--cc=kvm@vger.kernel.org \
--cc=len.brown@intel.com \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@kernel.org \
--cc=ravi.v.shankar@intel.com \
--cc=tglx@linutronix.de \
--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).