From: Segher Boessenkool <segher@kernel.crashing.org>
To: Nicholas Piggin <npiggin@gmail.com>
Cc: linuxppc-dev@lists.ozlabs.org
Subject: Re: [RFC PATCH 2/2] powerpc/64s: system call support for scv/rfscv instructions
Date: Tue, 5 May 2020 17:11:19 -0500 [thread overview]
Message-ID: <20200505221119.GQ31009@gate.crashing.org> (raw)
In-Reply-To: <20200430040202.1735506-3-npiggin@gmail.com>
Hi!
On Thu, Apr 30, 2020 at 02:02:02PM +1000, Nicholas Piggin wrote:
> Add support for the scv instruction on POWER9 and later CPUs.
Looks good to me in general :-)
> For now this implements the zeroth scv vector 'scv 0', as identical
> to 'sc' system calls, with the exception that lr is not preserved, and
> it is 64-bit only. There may yet be changes made to this ABI, so it's
> for testing only.
What does it do with SF=0? I don't see how it is obviously not a
security hole currently (but I didn't look too closely).
Segher
next prev parent reply other threads:[~2020-05-05 22:12 UTC|newest]
Thread overview: 7+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-04-30 4:02 [RFC PATCH 0/2] powerpc/64s: scv support Nicholas Piggin
2020-04-30 4:02 ` [RFC PATCH 1/2] powerpc/64s/exception: treat NIA below __end_interrupts as soft-masked Nicholas Piggin
2020-04-30 4:02 ` [RFC PATCH 2/2] powerpc/64s: system call support for scv/rfscv instructions Nicholas Piggin
2020-05-05 22:11 ` Segher Boessenkool [this message]
2020-05-06 1:11 ` Nicholas Piggin
2020-05-13 20:55 ` Matheus Castanho
2020-06-11 2:34 ` Nicholas Piggin
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=20200505221119.GQ31009@gate.crashing.org \
--to=segher@kernel.crashing.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 NNTP newsgroup(s).