From: Josh Poimboeuf <jpoimboe@kernel.org>
To: Andrew Cooper <andrew.cooper3@citrix.com>
Cc: Pawan Gupta <pawan.kumar.gupta@linux.intel.com>,
Thomas Gleixner <tglx@linutronix.de>,
Ingo Molnar <mingo@redhat.com>, Borislav Petkov <bp@alien8.de>,
Dave Hansen <dave.hansen@linux.intel.com>,
x86@kernel.org, "H. Peter Anvin" <hpa@zytor.com>,
Peter Zijlstra <peterz@infradead.org>,
Andy Lutomirski <luto@kernel.org>,
Jonathan Corbet <corbet@lwn.net>,
Sean Christopherson <seanjc@google.com>,
Paolo Bonzini <pbonzini@redhat.com>,
tony.luck@intel.com, ak@linux.intel.com,
tim.c.chen@linux.intel.com,
Nikolay Borisov <nik.borisov@suse.com>,
linux-kernel@vger.kernel.org, linux-doc@vger.kernel.org,
kvm@vger.kernel.org,
Alyssa Milburn <alyssa.milburn@linux.intel.com>,
Daniel Sneddon <daniel.sneddon@linux.intel.com>,
antonio.gomez.iglesias@linux.intel.com,
Greg Kroah-Hartman <gregkh@linuxfoundation.org>,
Alyssa Milburn <alyssa.milburn@intel.com>
Subject: Re: [PATCH v4 1/6] x86/bugs: Add asm helpers for executing VERW
Date: Fri, 1 Dec 2023 12:04:42 -0800 [thread overview]
Message-ID: <20231201200442.lvyep5uqc6oa7kwj@treble> (raw)
In-Reply-To: <c61402de-c61e-4d7f-a2b1-3eaa13e4ef33@citrix.com>
On Fri, Dec 01, 2023 at 07:39:05PM +0000, Andrew Cooper wrote:
> On 01/12/2023 7:36 pm, Josh Poimboeuf wrote:
> > On Fri, Oct 27, 2023 at 07:38:40AM -0700, Pawan Gupta wrote:
> >> +.pushsection .entry.text, "ax"
> >> +
> >> +.align L1_CACHE_BYTES, 0xcc
> >> +SYM_CODE_START_NOALIGN(mds_verw_sel)
> >> + UNWIND_HINT_UNDEFINED
> >> + ANNOTATE_NOENDBR
> >> + .word __KERNEL_DS
> >> +.align L1_CACHE_BYTES, 0xcc
> >> +SYM_CODE_END(mds_verw_sel);
> >> +/* For KVM */
> >> +EXPORT_SYMBOL_GPL(mds_verw_sel);
> >> +
> >> +.popsection
> > This is data, so why is it "CODE" in .entry.text?
>
> Because KPTI.
Urgh... Pawan please add a comment.
--
Josh
next prev parent reply other threads:[~2023-12-01 20:05 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2023-10-27 14:38 [PATCH v4 0/6] Delay VERW Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 1/6] x86/bugs: Add asm helpers for executing VERW Pawan Gupta
2023-10-27 15:32 ` Borislav Petkov
2023-11-02 0:01 ` Pawan Gupta
2023-12-01 19:36 ` Josh Poimboeuf
2023-12-01 19:39 ` Andrew Cooper
2023-12-01 20:04 ` Josh Poimboeuf [this message]
2023-12-20 1:15 ` Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 2/6] x86/entry_64: Add VERW just before userspace transition Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 3/6] x86/entry_32: " Pawan Gupta
2023-10-27 14:38 ` [PATCH v4 4/6] x86/bugs: Use ALTERNATIVE() instead of mds_user_clear static key Pawan Gupta
2023-12-01 19:59 ` Josh Poimboeuf
2023-12-20 1:20 ` Pawan Gupta
2023-10-27 14:39 ` [PATCH v4 5/6] KVM: VMX: Use BT+JNC, i.e. EFLAGS.CF to select VMRESUME vs. VMLAUNCH Pawan Gupta
2023-10-27 14:39 ` [PATCH v4 6/6] KVM: VMX: Move VERW closer to VMentry for MDS mitigation Pawan Gupta
2023-12-01 20:02 ` Josh Poimboeuf
2023-12-20 1:25 ` Pawan Gupta
2023-10-27 14:48 ` [PATCH v4 0/6] Delay VERW Borislav Petkov
2023-10-27 15:05 ` Pawan Gupta
2023-10-27 15:12 ` Borislav Petkov
2023-10-27 15:32 ` Pawan Gupta
2023-10-27 15:36 ` Borislav Petkov
2023-10-27 15:38 ` Greg Kroah-Hartman
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=20231201200442.lvyep5uqc6oa7kwj@treble \
--to=jpoimboe@kernel.org \
--cc=ak@linux.intel.com \
--cc=alyssa.milburn@intel.com \
--cc=alyssa.milburn@linux.intel.com \
--cc=andrew.cooper3@citrix.com \
--cc=antonio.gomez.iglesias@linux.intel.com \
--cc=bp@alien8.de \
--cc=corbet@lwn.net \
--cc=daniel.sneddon@linux.intel.com \
--cc=dave.hansen@linux.intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=hpa@zytor.com \
--cc=kvm@vger.kernel.org \
--cc=linux-doc@vger.kernel.org \
--cc=linux-kernel@vger.kernel.org \
--cc=luto@kernel.org \
--cc=mingo@redhat.com \
--cc=nik.borisov@suse.com \
--cc=pawan.kumar.gupta@linux.intel.com \
--cc=pbonzini@redhat.com \
--cc=peterz@infradead.org \
--cc=seanjc@google.com \
--cc=tglx@linutronix.de \
--cc=tim.c.chen@linux.intel.com \
--cc=tony.luck@intel.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