From: Marc Zyngier <maz@kernel.org>
To: kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org,
linux-arm-kernel@lists.infradead.org
Cc: James Morse <james.morse@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Alexandru Elisei <alexandru.elisei@arm.com>,
Will Deacon <will@kernel.org>,
Quentin Perret <qperret@google.com>,
Fuad Tabba <tabba@google.com>,
kernel-team@android.com
Subject: [PATCH 0/2] KVM/arm64: Early PSTATE evaluation fixes
Date: Tue, 23 Nov 2021 14:22:45 +0000 [thread overview]
Message-ID: <20211123142247.62532-1-maz@kernel.org> (raw)
There are a number of cases where we evaluate PSTATE early on guest
exit. Nothing wrong with that. Except that we actually synchronise
KVM's view of PSTATE pretty late, way after we needed it. Oopsie boo.
Thankfully, there are only two paths that require it: GICv3 emulation
for 32bit guests, and trap handling of 32bit guests in protected
mode. There is no known need of the former (though you could enable it
on the command line), and the latter is still a work in progress. In
any case, this needs fixing.
Funnily enough, this is something that I had already solved on NV, so
the solution isn't that different from what I have there.
Unless someone shouts, I intend to merge these as fixes.
Marc Zyngier (2):
KVM: arm64: Save PSTATE early on exit
KVM: arm64: Move pkvm's special 32bit handling into a generic
infrastructure
arch/arm64/kvm/hyp/include/hyp/switch.h | 14 ++++++++++++++
arch/arm64/kvm/hyp/include/hyp/sysreg-sr.h | 7 ++++++-
arch/arm64/kvm/hyp/nvhe/switch.c | 8 +-------
arch/arm64/kvm/hyp/vhe/switch.c | 4 ++++
4 files changed, 25 insertions(+), 8 deletions(-)
--
2.30.2
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
next reply other threads:[~2021-11-23 14:25 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-11-23 14:22 Marc Zyngier [this message]
2021-11-23 14:22 ` [PATCH 1/2] KVM: arm64: Save PSTATE early on exit Marc Zyngier
2021-11-24 13:08 ` Fuad Tabba
2021-11-23 14:22 ` [PATCH 2/2] KVM: arm64: Move pkvm's special 32bit handling into a generic infrastructure Marc Zyngier
2021-11-24 13:11 ` Fuad Tabba
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=20211123142247.62532-1-maz@kernel.org \
--to=maz@kernel.org \
--cc=alexandru.elisei@arm.com \
--cc=james.morse@arm.com \
--cc=kernel-team@android.com \
--cc=kvm@vger.kernel.org \
--cc=kvmarm@lists.cs.columbia.edu \
--cc=linux-arm-kernel@lists.infradead.org \
--cc=qperret@google.com \
--cc=suzuki.poulose@arm.com \
--cc=tabba@google.com \
--cc=will@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).