From: Catalin Marinas <catalin.marinas@arm.com>
To: Joey Gouly <joey.gouly@arm.com>
Cc: linux-arm-kernel@lists.infradead.org, nd@arm.com,
broonie@kernel.org, james.morse@arm.com, mark.rutland@arm.com,
maz@kernel.org, oliver.upton@linux.dev, shuah@kernel.org,
suzuki.poulose@arm.com, will@kernel.org, yuzenghui@huawei.com
Subject: Re: [PATCH v3 11/20] arm64: add PTE_UXN/PTE_WRITE to SWAPPER_*_FLAGS
Date: Fri, 26 May 2023 10:33:50 +0100 [thread overview]
Message-ID: <ZHB8/jMos8JMaydy@arm.com> (raw)
In-Reply-To: <20230511110337.3385517-12-joey.gouly@arm.com>
On Thu, May 11, 2023 at 12:03:28PM +0100, Joey Gouly wrote:
> With PIE enabled, the swapper PTEs would have a Permission Indirection Index
> (PIIndex) of 0. A PIIndex of 0 is not currently used by any other PTEs.
>
> To avoid using index 0 specifically for the swapper PTEs, mark them as
> PTE_UXN and PTE_WRITE, so that they map to a PAGE_KERNEL_EXEC equivalent.
>
> This also adds PTE_WRITE to KPTI_NG_PTE_FLAGS, which was tested by booting
> with kpti=on.
>
> Signed-off-by: Joey Gouly <joey.gouly@arm.com>
> Cc: Catalin Marinas <catalin.marinas@arm.com>
> Cc: Will Deacon <will@kernel.org>
> Cc: Mark Rutland <mark.rutland@arm.com>
It looks fine now.
Reviewed-by: Catalin Marinas <catalin.marinas@arm.com>
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next parent reply other threads:[~2023-05-26 9:34 UTC|newest]
Thread overview: 8+ messages / expand[flat|nested] mbox.gz Atom feed top
[not found] <20230511110337.3385517-1-joey.gouly@arm.com>
[not found] ` <20230511110337.3385517-12-joey.gouly@arm.com>
2023-05-26 9:33 ` Catalin Marinas [this message]
2023-06-01 12:02 ` [PATCH v3 00/20] Permission Indirection Extension Mark Brown
[not found] ` <20230511110337.3385517-9-joey.gouly@arm.com>
2023-06-02 14:56 ` [PATCH v3 08/20] KVM: arm64: Save/restore TCR2_EL1 Catalin Marinas
2023-06-03 8:34 ` Marc Zyngier
[not found] ` <20230511110337.3385517-10-joey.gouly@arm.com>
2023-06-02 14:57 ` [PATCH v3 09/20] KVM: arm64: Save/restore PIE registers Catalin Marinas
2023-06-03 8:35 ` Marc Zyngier
[not found] ` <20230511110337.3385517-11-joey.gouly@arm.com>
2023-06-03 8:35 ` [PATCH v3 10/20] KVM: arm64: expose ID_AA64MMFR3_EL1 to guests Marc Zyngier
2023-06-05 17:58 ` [PATCH v3 00/20] Permission Indirection Extension Catalin Marinas
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