From: Sebastian Ott <sebott@redhat.com>
To: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Cc: kvmarm@lists.linux.dev, maz@kernel.org, oliver.upton@linux.dev,
james.morse@arm.com, joey.gouly@arm.com, suzuki.poulose@arm.com,
yuzenghui@huawei.com, wangzhou1@hisilicon.com,
linux-arm-kernel@lists.infradead.org, linuxarm@huawei.com
Subject: Re: [PATCH] KVM: arm64: Make L1Ip feature in CTR_EL0 writable from userspace
Date: Fri, 18 Oct 2024 10:38:35 +0200 (CEST) [thread overview]
Message-ID: <6d7c3d96-d1e9-d1b8-db3d-83ff2da00458@redhat.com> (raw)
In-Reply-To: <20241017085925.40532-1-shameerali.kolothum.thodi@huawei.com>
[-- Attachment #1: Type: text/plain, Size: 522 bytes --]
On Thu, 17 Oct 2024, Shameer Kolothum wrote:
> Only allow userspace to set VIPT(0b10) or PIPT(0b11) for L1Ip based on
> what hardware reports as both AIVIVT (0b01) and VPIPT (0b00) are
> documented as reserved.
>
> Using a VIPT for Guest where hardware reports PIPT may lead to over
> invalidation, but is still correct. Hence, we can allow downgrading
> PIPT to VIPT, but not the other way around.
>
> Signed-off-by: Shameer Kolothum <shameerali.kolothum.thodi@huawei.com>
Reviewed-by: Sebastian Ott <sebott@redhat.com>
next prev parent reply other threads:[~2024-10-18 8:38 UTC|newest]
Thread overview: 5+ messages / expand[flat|nested] mbox.gz Atom feed top
2024-10-17 8:59 [PATCH] KVM: arm64: Make L1Ip feature in CTR_EL0 writable from userspace Shameer Kolothum
2024-10-18 8:38 ` Sebastian Ott [this message]
2024-10-18 10:23 ` Marc Zyngier
2024-10-21 7:23 ` Shameerali Kolothum Thodi
2024-10-21 8:19 ` Marc Zyngier
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