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From: Oliver Upton <oliver.upton@linux.dev>
To: Mark Brown <broonie@kernel.org>
Cc: Catalin Marinas <catalin.marinas@arm.com>,
	Will Deacon <will@kernel.org>, Marc Zyngier <maz@kernel.org>,
	Peter Maydell <peter.maydell@linaro.org>,
	Richard Henderson <richard.henderson@linaro.org>,
	Vincent Donnefort <vdonnefort@google.com>,
	James Morse <james.morse@arm.com>,
	Alexandru Elisei <alexandru.elisei@arm.com>,
	Suzuki K Poulose <suzuki.poulose@arm.com>,
	linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev
Subject: Re: [PATCH v1 0/2] arm64/sme: Fix SMPRI_EL1 traps for KVM guests
Message-ID: <Y1skhMlaBoFfAZDH@google.com>
References: <20221027210441.814061-1-broonie@kernel.org>
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On Thu, Oct 27, 2022 at 10:04:38PM +0100, Mark Brown wrote:
> When adding support for SME I missed management of traps for SMPRI_EL1
> in KVM guests.  This series adds that management, and also updates the
> documentation to help avoid such issues in future.
> 
> This was noticed due to Vincent Donnefort noticing that qemu has
> implemented support for SME virtualisation but not fine grained traps
> which was causing problems for qemu in nVHE mode since that already used
> fine grained traps with SME, the FGT registers are not implemented and
> UNDEF.  As a result of this change VHE will also be affected so a
> separate series "KVM: arm: Refuse to enable KVM on systems with SME but
> not FGT" has been sent which will ensure we don't run on such systems.
> 
> Mark Brown (2):
>   arm64: booting: Document our requirements for fine grained traps with
>     SME
>   KVM: arm64: Trap access to SMPRI_EL1 in VHE mode

For the series:

Reviewed-by: Oliver Upton <oliver.upton@linux.dev>

--
Thanks,
Oliver