From: Michael Ellerman <patch-notifications@ellerman.id.au>
To: Suraj Jitindar Singh <sjitindarsingh@gmail.com>,
linuxppc-dev@lists.ozlabs.org
Cc: clg@kaod.org, kvm-ppc@vger.kernel.org, sjitindarsingh@gmail.com
Subject: Re: [PATCH 2/3] KVM: PPC: Book3S HV: Signed extend decrementer value if not using large decr
Date: Sun, 30 Jun 2019 18:37:33 +1000 (AEST) [thread overview]
Message-ID: <45c3lx4g6Kz9sNt@ozlabs.org> (raw)
In-Reply-To: <20190620014651.7645-2-sjitindarsingh@gmail.com>
On Thu, 2019-06-20 at 01:46:50 UTC, Suraj Jitindar Singh wrote:
> On POWER9 the decrementer can operate in large decrementer mode where
> the decrementer is 56 bits and signed extended to 64 bits. When not
> operating in this mode the decrementer behaves as a 32 bit decrementer
> which is NOT signed extended (as on POWER8).
>
> Currently when reading a guest decrementer value we don't take into
> account whether the large decrementer is enabled or not, and this means
> the value will be incorrect when the guest is not using the large
> decrementer. Fix this by sign extending the value read when the guest
> isn't using the large decrementer.
>
> Fixes: 95a6432ce903 "KVM: PPC: Book3S HV: Streamlined guest entry/exit path on P9 for radix guests"
>
> Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com>
> Tested-by: Laurent Vivier <lvivier@redhat.com>
Applied to powerpc next, thanks.
https://git.kernel.org/powerpc/c/869537709ebf1dc865e75c3fc97b23f8acf37c16
cheers
next prev parent reply other threads:[~2019-06-30 8:57 UTC|newest]
Thread overview: 9+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-06-20 1:46 [PATCH 1/3] KVM: PPC: Book3S HV: Invalidate ERAT when flushing guest TLB entries Suraj Jitindar Singh
2019-06-20 1:46 ` [PATCH 2/3] KVM: PPC: Book3S HV: Signed extend decrementer value if not using large decr Suraj Jitindar Singh
2019-06-20 7:56 ` Laurent Vivier
2019-06-30 8:37 ` Michael Ellerman [this message]
2019-06-20 1:46 ` [PATCH 3/3] KVM: PPC: Book3S HV: Clear pending decr exceptions on nested guest entry Suraj Jitindar Singh
2019-06-20 7:57 ` Laurent Vivier
2019-06-20 8:19 ` Cédric Le Goater
2019-06-30 8:37 ` Michael Ellerman
2019-06-23 10:34 ` [PATCH 1/3] KVM: PPC: Book3S HV: Invalidate ERAT when flushing guest TLB entries Michael Ellerman
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=45c3lx4g6Kz9sNt@ozlabs.org \
--to=patch-notifications@ellerman.id.au \
--cc=clg@kaod.org \
--cc=kvm-ppc@vger.kernel.org \
--cc=linuxppc-dev@lists.ozlabs.org \
--cc=sjitindarsingh@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).