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 v13 3/8] arm64: mte: Sync tags for pages where PTE is untagged
Date: Thu, 3 Jun 2021 15:20:23 +0100 [thread overview]
Message-ID: <20210603142023.GC20338@arm.com> (raw)
In-Reply-To: <20210524104513.13258-4-steven.price@arm.com>
On Mon, May 24, 2021 at 11:45:08AM +0100, Steven Price wrote:
> A KVM guest could store tags in a page even if the VMM hasn't mapped
> the page with PROT_MTE. So when restoring pages from swap we will
> need to check to see if there are any saved tags even if !pte_tagged().
>
> However don't check pages for which pte_access_permitted() returns false
> as these will not have been swapped out.
>
> Signed-off-by: Steven Price <steven.price@arm.com>
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
next prev parent reply other threads:[~2021-06-03 14:22 UTC|newest]
Thread overview: 23+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-05-24 10:45 [PATCH v13 0/8] MTE support for KVM guest Steven Price
2021-05-24 10:45 ` [PATCH v13 1/8] arm64: mte: Handle race when synchronising tags Steven Price
2021-05-24 10:45 ` [PATCH v13 2/8] arm64: Handle MTE tags zeroing in __alloc_zeroed_user_highpage() Steven Price
2021-05-24 10:45 ` [PATCH v13 3/8] arm64: mte: Sync tags for pages where PTE is untagged Steven Price
2021-06-03 14:20 ` Catalin Marinas [this message]
2021-05-24 10:45 ` [PATCH v13 4/8] KVM: arm64: Introduce MTE VM feature Steven Price
2021-06-03 16:00 ` Catalin Marinas
2021-06-04 9:01 ` Catalin Marinas
2021-06-04 10:42 ` Steven Price
2021-06-04 11:36 ` Catalin Marinas
2021-06-04 12:51 ` Steven Price
2021-06-04 14:05 ` Catalin Marinas
2021-05-24 10:45 ` [PATCH v13 5/8] KVM: arm64: Save/restore MTE registers Steven Price
2021-06-03 16:48 ` Catalin Marinas
2021-05-24 10:45 ` [PATCH v13 6/8] KVM: arm64: Expose KVM_ARM_CAP_MTE Steven Price
2021-06-03 16:58 ` Catalin Marinas
2021-05-24 10:45 ` [PATCH v13 7/8] KVM: arm64: ioctl to fetch/store tags in a guest Steven Price
2021-06-03 17:13 ` Catalin Marinas
2021-06-04 11:15 ` Steven Price
2021-06-04 11:42 ` Catalin Marinas
2021-06-04 13:09 ` Steven Price
2021-06-04 15:34 ` Catalin Marinas
2021-05-24 10:45 ` [PATCH v13 8/8] KVM: arm64: Document MTE capability and ioctl Steven Price
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