From: Oliver Upton <oliver.upton@linux.dev>
To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev,
Marc Zyngier <maz@kernel.org>
Cc: Oliver Upton <oliver.upton@linux.dev>,
Joey Gouly <joey.gouly@arm.com>,
Suzuki K Poulose <suzuki.poulose@arm.com>,
Zenghui Yu <yuzenghui@huawei.com>, Will Deacon <will@kernel.org>,
Catalin Marinas <catalin.marinas@arm.com>,
Mark Brown <broonie@kernel.org>
Subject: Re: [PATCH 0/2] KVM: arm64: Fix HCRX_EL2.GCSEn handling
Date: Wed, 7 May 2025 00:56:48 -0700 [thread overview]
Message-ID: <174660459090.2542293.10603043906149596192.b4-ty@linux.dev> (raw)
In-Reply-To: <20250430105916.3815157-1-maz@kernel.org>
On Wed, 30 Apr 2025 11:59:14 +0100, Marc Zyngier wrote:
> Will points out[1] that GCS is completely busted on the host if we
> ever run a guest, as HCRX_EL2 gets set to a fixed value on vcpu exit,
> value that doesn't include the GCSEn bit. This is likely to kaboom on
> a nVHE/hVHE setup.
>
> Obviously, nobody ever tested this.
>
> [...]
Applied to fixes, thanks!
[1/2] KVM: arm64: Properly save/restore HCRX_EL2
https://git.kernel.org/kvmarm/kvmarm/c/ffea7c73d181
[2/2] KVM: arm64: Kill HCRX_HOST_FLAGS
https://git.kernel.org/kvmarm/kvmarm/c/ef296ee98bb1
--
Best,
Oliver
prev parent reply other threads:[~2025-05-07 7:57 UTC|newest]
Thread overview: 4+ messages / expand[flat|nested] mbox.gz Atom feed top
2025-04-30 10:59 [PATCH 0/2] KVM: arm64: Fix HCRX_EL2.GCSEn handling Marc Zyngier
2025-04-30 10:59 ` [PATCH 1/2] KVM: arm64: Properly save/restore HCRX_EL2 Marc Zyngier
2025-04-30 10:59 ` [PATCH 2/2] KVM: arm64: Kill HCRX_HOST_FLAGS Marc Zyngier
2025-05-07 7:56 ` Oliver Upton [this message]
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