All of lore.kernel.org
 help / color / mirror / Atom feed
From: Peter Maydell <peter.maydell@linaro.org>
To: Steven Price <steven.price@arm.com>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Marc Zyngier <maz@kernel.org>, Will Deacon <will@kernel.org>,
	James Morse <james.morse@arm.com>,
	Julien Thierry <julien.thierry.kdev@gmail.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	kvmarm <kvmarm@lists.cs.columbia.edu>,
	arm-mail-list <linux-arm-kernel@lists.infradead.org>,
	lkml - Kernel Mailing List <linux-kernel@vger.kernel.org>,
	Dave Martin <Dave.Martin@arm.com>,
	Mark Rutland <mark.rutland@arm.com>,
	Thomas Gleixner <tglx@linutronix.de>,
	QEMU Developers <qemu-devel@nongnu.org>,
	Juan Quintela <quintela@redhat.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Richard Henderson <richard.henderson@linaro.org>,
	Haibo Xu <Haibo.Xu@arm.com>, Andrew Jones <drjones@redhat.com>
Subject: Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 8 Feb 2021 17:31:39 +0000	[thread overview]
Message-ID: <CAFEAcA99kV_d6ev9wC4ySiyoD7Cp=HCD0v2bBhGSOU-KrzkqaQ@mail.gmail.com> (raw)
In-Reply-To: <20210205135803.48321-6-steven.price@arm.com>

On Fri, 5 Feb 2021 at 13:58, Steven Price <steven.price@arm.com> wrote:
>
> The VMM may not wish to have it's own mapping of guest memory mapped
> with PROT_MTE because this causes problems if the VMM has tag checking
> enabled (the guest controls the tags in physical RAM and it's unlikely
> the tags are correct for the VMM).
>
> Instead add a new ioctl which allows the VMM to easily read/write the
> tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
> while the VMM can still read/write the tags for the purpose of
> migration.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  arch/arm64/include/uapi/asm/kvm.h | 13 +++++++
>  arch/arm64/kvm/arm.c              | 57 +++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h          |  1 +
>  3 files changed, 71 insertions(+)

Missing the update to the docs in Documentation/virtual/kvm/api.txt :-)

thanks
-- PMM

WARNING: multiple messages have this Message-ID (diff)
From: Peter Maydell <peter.maydell@linaro.org>
To: Steven Price <steven.price@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Andrew Jones <drjones@redhat.com>, Haibo Xu <Haibo.Xu@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.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>,
	James Morse <james.morse@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>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 8 Feb 2021 17:31:39 +0000	[thread overview]
Message-ID: <CAFEAcA99kV_d6ev9wC4ySiyoD7Cp=HCD0v2bBhGSOU-KrzkqaQ@mail.gmail.com> (raw)
In-Reply-To: <20210205135803.48321-6-steven.price@arm.com>

On Fri, 5 Feb 2021 at 13:58, Steven Price <steven.price@arm.com> wrote:
>
> The VMM may not wish to have it's own mapping of guest memory mapped
> with PROT_MTE because this causes problems if the VMM has tag checking
> enabled (the guest controls the tags in physical RAM and it's unlikely
> the tags are correct for the VMM).
>
> Instead add a new ioctl which allows the VMM to easily read/write the
> tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
> while the VMM can still read/write the tags for the purpose of
> migration.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  arch/arm64/include/uapi/asm/kvm.h | 13 +++++++
>  arch/arm64/kvm/arm.c              | 57 +++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h          |  1 +
>  3 files changed, 71 insertions(+)

Missing the update to the docs in Documentation/virtual/kvm/api.txt :-)

thanks
-- PMM


WARNING: multiple messages have this Message-ID (diff)
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: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 8 Feb 2021 17:31:39 +0000	[thread overview]
Message-ID: <CAFEAcA99kV_d6ev9wC4ySiyoD7Cp=HCD0v2bBhGSOU-KrzkqaQ@mail.gmail.com> (raw)
In-Reply-To: <20210205135803.48321-6-steven.price@arm.com>

On Fri, 5 Feb 2021 at 13:58, Steven Price <steven.price@arm.com> wrote:
>
> The VMM may not wish to have it's own mapping of guest memory mapped
> with PROT_MTE because this causes problems if the VMM has tag checking
> enabled (the guest controls the tags in physical RAM and it's unlikely
> the tags are correct for the VMM).
>
> Instead add a new ioctl which allows the VMM to easily read/write the
> tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
> while the VMM can still read/write the tags for the purpose of
> migration.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  arch/arm64/include/uapi/asm/kvm.h | 13 +++++++
>  arch/arm64/kvm/arm.c              | 57 +++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h          |  1 +
>  3 files changed, 71 insertions(+)

Missing the update to the docs in Documentation/virtual/kvm/api.txt :-)

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

WARNING: multiple messages have this Message-ID (diff)
From: Peter Maydell <peter.maydell@linaro.org>
To: Steven Price <steven.price@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
	"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
	Andrew Jones <drjones@redhat.com>, Haibo Xu <Haibo.Xu@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.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>,
	James Morse <james.morse@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>,
	Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 8 Feb 2021 17:31:39 +0000	[thread overview]
Message-ID: <CAFEAcA99kV_d6ev9wC4ySiyoD7Cp=HCD0v2bBhGSOU-KrzkqaQ@mail.gmail.com> (raw)
In-Reply-To: <20210205135803.48321-6-steven.price@arm.com>

On Fri, 5 Feb 2021 at 13:58, Steven Price <steven.price@arm.com> wrote:
>
> The VMM may not wish to have it's own mapping of guest memory mapped
> with PROT_MTE because this causes problems if the VMM has tag checking
> enabled (the guest controls the tags in physical RAM and it's unlikely
> the tags are correct for the VMM).
>
> Instead add a new ioctl which allows the VMM to easily read/write the
> tags from guest memory, allowing the VMM's mapping to be non-PROT_MTE
> while the VMM can still read/write the tags for the purpose of
> migration.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
> ---
>  arch/arm64/include/uapi/asm/kvm.h | 13 +++++++
>  arch/arm64/kvm/arm.c              | 57 +++++++++++++++++++++++++++++++
>  include/uapi/linux/kvm.h          |  1 +
>  3 files changed, 71 insertions(+)

Missing the update to the docs in Documentation/virtual/kvm/api.txt :-)

thanks
-- PMM

_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel

  reply	other threads:[~2021-02-08 19:03 UTC|newest]

Thread overview: 32+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-02-05 13:57 [PATCH v8 0/5] MTE support for KVM guest Steven Price
2021-02-05 13:57 ` Steven Price
2021-02-05 13:57 ` Steven Price
2021-02-05 13:57 ` Steven Price
2021-02-05 13:57 ` [PATCH v8 1/5] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-02-05 13:57   ` Steven Price
2021-02-05 13:57   ` Steven Price
2021-02-05 13:57   ` Steven Price
2021-02-05 13:58 ` [PATCH v8 2/5] arm64: kvm: Introduce MTE VM feature Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58 ` [PATCH v8 3/5] arm64: kvm: Save/restore MTE registers Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58 ` [PATCH v8 4/5] arm64: kvm: Expose KVM_ARM_CAP_MTE Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58 ` [RFC PATCH v8 5/5] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-05 13:58   ` Steven Price
2021-02-08 17:31   ` Peter Maydell [this message]
2021-02-08 17:31     ` Peter Maydell
2021-02-08 17:31     ` Peter Maydell
2021-02-08 17:31     ` Peter Maydell
2021-02-10 16:03     ` Steven Price
2021-02-10 16:03       ` Steven Price
2021-02-10 16:03       ` Steven Price
2021-02-10 16:03       ` Steven Price

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='CAFEAcA99kV_d6ev9wC4ySiyoD7Cp=HCD0v2bBhGSOU-KrzkqaQ@mail.gmail.com' \
    --to=peter.maydell@linaro.org \
    --cc=Dave.Martin@arm.com \
    --cc=Haibo.Xu@arm.com \
    --cc=catalin.marinas@arm.com \
    --cc=dgilbert@redhat.com \
    --cc=drjones@redhat.com \
    --cc=james.morse@arm.com \
    --cc=julien.thierry.kdev@gmail.com \
    --cc=kvmarm@lists.cs.columbia.edu \
    --cc=linux-arm-kernel@lists.infradead.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mark.rutland@arm.com \
    --cc=maz@kernel.org \
    --cc=qemu-devel@nongnu.org \
    --cc=quintela@redhat.com \
    --cc=richard.henderson@linaro.org \
    --cc=steven.price@arm.com \
    --cc=suzuki.poulose@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 an external index of several public inboxes,
see mirroring instructions on how to clone and mirror
all data and code used by this external index.