From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: kvm-ppc@vger.kernel.org, Nicholas Piggin <npiggin@gmail.com>,
linuxppc-dev@lists.ozlabs.org
Subject: Re: [PATCH] KVM: PPC: Book3S HV: H_ENTER filter out reserved HPTE[B] value
Date: Tue, 02 Nov 2021 10:11:30 +0000 [thread overview]
Message-ID: <163584789016.1845480.2757100550456404160.b4-ty@ellerman.id.au> (raw)
In-Reply-To: <20211004145749.1331331-1-npiggin@gmail.com>
On Tue, 5 Oct 2021 00:57:49 +1000, Nicholas Piggin wrote:
> The HPTE B field is a 2-bit field with values 0b10 and 0b11 reserved.
> This field is also taken from the HPTE and used when KVM executes
> TLBIEs to set the B field of those instructions.
>
> Disallow the guest setting B to a reserved value with H_ENTER by
> rejecting it. This is the same approach already taken for rejecting
> reserved (unsupported) LLP values. This prevents the guest from being
> able to induce the host to execute TLBIE with reserved values, which
> is not known to be a problem with current processors but in theory it
> could prevent the TLBIE from working correctly in a future processor.
>
> [...]
Applied to powerpc/next.
[1/1] KVM: PPC: Book3S HV: H_ENTER filter out reserved HPTE[B] value
https://git.kernel.org/powerpc/c/322fda0405fecaaa540b0fa90393830aaadaf420
cheers
prev parent reply other threads:[~2021-11-02 10:11 UTC|newest]
Thread overview: 3+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-10-04 14:57 [PATCH] KVM: PPC: Book3S HV: H_ENTER filter out reserved HPTE[B] value Nicholas Piggin
2021-10-11 14:47 ` Fabiano Rosas
2021-11-02 10:11 ` Michael Ellerman [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=163584789016.1845480.2757100550456404160.b4-ty@ellerman.id.au \
--to=patch-notifications@ellerman.id.au \
--cc=kvm-ppc@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=npiggin@gmail.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 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 read-only IMAP folder(s) and NNTP newsgroup(s).