kvmarm.lists.cs.columbia.edu archive mirror
 help / color / mirror / Atom feed
From: Peter Maydell <peter.maydell@linaro.org>
To: Steven Price <steven.price@arm.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Catalin Marinas <catalin.marinas@arm.com>,
	Juan Quintela <quintela@redhat.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Dave Martin <Dave.Martin@arm.com>,
	arm-mail-list <linux-arm-kernel@lists.infradead.org>,
	Marc Zyngier <maz@kernel.org>,
	Thomas Gleixner <tglx@linutronix.de>,
	Will Deacon <will@kernel.org>,
	kvmarm <kvmarm@lists.cs.columbia.edu>
Subject: Re: [PATCH v5 0/2] MTE support for KVM guest
Date: Thu, 19 Nov 2020 15:45:40 +0000	[thread overview]
Message-ID: <CAFEAcA85fiqA206FuFANKbV_3GkfY1F8Gv7MP58BgTT81bs9kA@mail.gmail.com> (raw)
In-Reply-To: <20201119153901.53705-1-steven.price@arm.com>

On Thu, 19 Nov 2020 at 15:39, Steven Price <steven.price@arm.com> wrote:
> This series adds support for Arm's Memory Tagging Extension (MTE) to
> KVM, allowing KVM guests to make use of it. This builds on the existing
> user space support already in v5.10-rc1, see [1] for an overview.

> The change to require the VMM to map all guest memory PROT_MTE is
> significant as it means that the VMM has to deal with the MTE tags even
> if it doesn't care about them (e.g. for virtual devices or if the VMM
> doesn't support migration). Also unfortunately because the VMM can
> change the memory layout at any time the check for PROT_MTE/VM_MTE has
> to be done very late (at the point of faulting pages into stage 2).

I'm a bit dubious about requring the VMM to map the guest memory
PROT_MTE unless somebody's done at least a sketch of the design
for how this would work on the QEMU side. Currently QEMU just
assumes the guest memory is guest memory and it can access it
without special precautions...

thanks
-- PMM
_______________________________________________
kvmarm mailing list
kvmarm@lists.cs.columbia.edu
https://lists.cs.columbia.edu/mailman/listinfo/kvmarm

  parent reply	other threads:[~2020-11-19 15:45 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-19 15:38 [PATCH v5 0/2] MTE support for KVM guest Steven Price
2020-11-19 15:39 ` [PATCH v5 1/2] arm64: kvm: Save/restore MTE registers Steven Price
2020-11-19 15:39 ` [PATCH v5 2/2] arm64: kvm: Introduce MTE VCPU feature Steven Price
2020-11-19 15:45 ` Peter Maydell [this message]
2020-11-19 15:57   ` [PATCH v5 0/2] MTE support for KVM guest Steven Price
2020-11-19 16:39     ` Peter Maydell
2020-11-19 18:42   ` Andrew Jones
2020-11-19 19:11     ` Marc Zyngier
2020-11-20  9:50       ` Steven Price
2020-11-20  9:56         ` Marc Zyngier
2020-11-20  9:58           ` Steven Price
2020-12-04  8:25         ` Haibo Xu
2020-12-07 14:48           ` Steven Price
2020-12-07 15:27             ` Peter Maydell
2020-12-07 15:45               ` Steven Price
2020-12-07 16:05                 ` Marc Zyngier
2020-12-07 16:34                   ` Catalin Marinas
2020-12-07 19:03                     ` Marc Zyngier
2020-12-08 17:21                       ` Catalin Marinas
2020-12-08 18:21                         ` Marc Zyngier
2020-12-09 12:44                           ` Catalin Marinas
2020-12-09 13:25                             ` Marc Zyngier
2020-12-09 15:27                               ` Catalin Marinas
2020-12-09 18:27                                 ` Richard Henderson
2020-12-09 18:39                                   ` Catalin Marinas
2020-12-09 20:13                                     ` Richard Henderson
2020-12-09 20:20                                       ` Peter Maydell
2020-12-07 16:44                 ` Dr. David Alan Gilbert
2020-12-07 17:10                   ` Peter Maydell
2020-12-07 17:44                     ` Dr. David Alan Gilbert
2020-12-08 10:05                   ` Haibo Xu
2020-12-08  9:51             ` Haibo Xu
2020-12-08 10:01               ` Marc Zyngier
2020-12-08 10:10                 ` Haibo Xu
2020-12-16  7:31             ` Haibo Xu
2020-12-16 10:22               ` Steven Price
2020-12-17  1:47                 ` Haibo Xu
2020-11-23 12:16   ` Dr. David Alan Gilbert

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=CAFEAcA85fiqA206FuFANKbV_3GkfY1F8Gv7MP58BgTT81bs9kA@mail.gmail.com \
    --to=peter.maydell@linaro.org \
    --cc=Dave.Martin@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=dgilbert@redhat.com \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=maz@kernel.org \
    --cc=qemu-devel@nongnu.org \
    --cc=quintela@redhat.com \
    --cc=richard.henderson@linaro.org \
    --cc=steven.price@arm.com \
    --cc=tglx@linutronix.de \
    --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).