From: Catalin Marinas <catalin.marinas@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: "Dr. David Alan Gilbert" <dgilbert@redhat.com>,
qemu-devel@nongnu.org, Marc Zyngier <maz@kernel.org>,
Juan Quintela <quintela@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
linux-arm-kernel@lists.infradead.org,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu
Subject: Re: [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 7 Jun 2021 18:21:02 +0100 [thread overview]
Message-ID: <20210607172102.GB17957@arm.com> (raw)
In-Reply-To: <20210607110816.25762-8-steven.price@arm.com>
On Mon, Jun 07, 2021 at 12:08:15PM +0100, Steven Price 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>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
_______________________________________________
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: Catalin Marinas <catalin.marinas@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: 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@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
qemu-devel@nongnu.org, Juan Quintela <quintela@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Peter Maydell <peter.maydell@linaro.org>,
Haibo Xu <Haibo.Xu@arm.com>, Andrew Jones <drjones@redhat.com>
Subject: Re: [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 7 Jun 2021 18:21:02 +0100 [thread overview]
Message-ID: <20210607172102.GB17957@arm.com> (raw)
In-Reply-To: <20210607110816.25762-8-steven.price@arm.com>
On Mon, Jun 07, 2021 at 12:08:15PM +0100, Steven Price 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>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
_______________________________________________
linux-arm-kernel mailing list
linux-arm-kernel@lists.infradead.org
http://lists.infradead.org/mailman/listinfo/linux-arm-kernel
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: 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@lists.cs.columbia.edu,
linux-arm-kernel@lists.infradead.org,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
Mark Rutland <mark.rutland@arm.com>,
Thomas Gleixner <tglx@linutronix.de>,
qemu-devel@nongnu.org, Juan Quintela <quintela@redhat.com>,
"Dr. David Alan Gilbert" <dgilbert@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
Peter Maydell <peter.maydell@linaro.org>,
Haibo Xu <Haibo.Xu@arm.com>, Andrew Jones <drjones@redhat.com>
Subject: Re: [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 7 Jun 2021 18:21:02 +0100 [thread overview]
Message-ID: <20210607172102.GB17957@arm.com> (raw)
In-Reply-To: <20210607110816.25762-8-steven.price@arm.com>
On Mon, Jun 07, 2021 at 12:08:15PM +0100, Steven Price 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>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
WARNING: multiple messages have this Message-ID (diff)
From: Catalin Marinas <catalin.marinas@arm.com>
To: Steven Price <steven.price@arm.com>
Cc: Mark Rutland <mark.rutland@arm.com>,
Peter Maydell <peter.maydell@linaro.org>,
"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-devel@nongnu.org, Marc Zyngier <maz@kernel.org>,
Juan Quintela <quintela@redhat.com>,
Richard Henderson <richard.henderson@linaro.org>,
linux-kernel@vger.kernel.org, Dave Martin <Dave.Martin@arm.com>,
James Morse <james.morse@arm.com>,
linux-arm-kernel@lists.infradead.org,
Thomas Gleixner <tglx@linutronix.de>,
Will Deacon <will@kernel.org>,
kvmarm@lists.cs.columbia.edu,
Julien Thierry <julien.thierry.kdev@gmail.com>
Subject: Re: [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest
Date: Mon, 7 Jun 2021 18:21:02 +0100 [thread overview]
Message-ID: <20210607172102.GB17957@arm.com> (raw)
In-Reply-To: <20210607110816.25762-8-steven.price@arm.com>
On Mon, Jun 07, 2021 at 12:08:15PM +0100, Steven Price 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>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2021-06-07 17:21 UTC|newest]
Thread overview: 80+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-06-07 11:08 [PATCH v14 0/8] MTE support for KVM guest Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 1/8] arm64: mte: Handle race when synchronising tags Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-09 10:30 ` Marc Zyngier
2021-06-09 10:30 ` Marc Zyngier
2021-06-09 10:30 ` Marc Zyngier
2021-06-09 10:30 ` Marc Zyngier
2021-06-09 10:51 ` Steven Price
2021-06-09 10:51 ` Steven Price
2021-06-09 10:51 ` Steven Price
2021-06-09 10:51 ` Steven Price
2021-06-09 11:19 ` Marc Zyngier
2021-06-09 11:19 ` Marc Zyngier
2021-06-09 11:19 ` Marc Zyngier
2021-06-09 11:19 ` Marc Zyngier
2021-06-09 17:41 ` Catalin Marinas
2021-06-09 17:41 ` Catalin Marinas
2021-06-09 17:41 ` Catalin Marinas
2021-06-09 17:41 ` Catalin Marinas
2021-06-10 8:05 ` Steven Price
2021-06-10 8:05 ` Steven Price
2021-06-10 8:05 ` Steven Price
2021-06-10 8:05 ` Steven Price
2021-06-10 14:07 ` Catalin Marinas
2021-06-10 14:07 ` Catalin Marinas
2021-06-10 14:07 ` Catalin Marinas
2021-06-10 14:07 ` Catalin Marinas
2021-06-07 11:08 ` [PATCH v14 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 17:07 ` Catalin Marinas
2021-06-07 17:07 ` Catalin Marinas
2021-06-07 17:07 ` Catalin Marinas
2021-06-07 17:07 ` Catalin Marinas
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 3/8] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 4/8] KVM: arm64: Introduce MTE VM feature Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 5/8] KVM: arm64: Save/restore MTE registers Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 6/8] KVM: arm64: Expose KVM_ARM_CAP_MTE Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` [PATCH v14 7/8] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 17:21 ` Catalin Marinas [this message]
2021-06-07 17:21 ` Catalin Marinas
2021-06-07 17:21 ` Catalin Marinas
2021-06-07 17:21 ` Catalin Marinas
2021-06-07 11:08 ` [PATCH v14 8/8] KVM: arm64: Document MTE capability and ioctl Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 11:08 ` Steven Price
2021-06-07 17:32 ` Catalin Marinas
2021-06-07 17:32 ` Catalin Marinas
2021-06-07 17:32 ` Catalin Marinas
2021-06-07 17:32 ` Catalin Marinas
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
2021-06-09 8:56 ` Steven Price
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