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Message-Id: <171820845262.4013377.6313187525127617561.b4-ty@arm.com>
Date: Wed, 12 Jun 2024 17:07:39 +0100
From: Catalin Marinas <catalin.marinas@....com>
To: maz@...nel.org,
will@...nel.org,
mark.rutland@....com,
oliver.upton@...ux.dev,
broonie@...nel.org,
ardb@...nel.org,
joey.gouly@....com,
ryan.roberts@....com,
jeremy.linton@....com,
linux-arm-kernel@...ts.infradead.org,
linux-kernel@...r.kernel.org,
Nianyao Tang <tangnianyao@...wei.com>
Cc: guoyang2@...wei.com
Subject: Re: [PATCH] arm64/cpufeatures/kvm: Add ARMv8.9 FEAT_ECBHB bits in ID_AA64MMFR1 register
On Tue, 11 Jun 2024 12:20:49 +0000, Nianyao Tang wrote:
> Enable ECBHB bits in ID_AA64MMFR1 register as per ARM DDI 0487K.a
> specification.
>
> When guest OS read ID_AA64MMFR1_EL1, kvm emulate this reg using
> ftr_id_aa64mmfr1 and always return ID_AA64MMFR1_EL1.ECBHB=0 to guest.
> It results in guest syscall jump to tramp ventry, which is not needed
> in implementation with ID_AA64MMFR1_EL1.ECBHB=1.
> Let's make the guest syscall process the same as the host.
>
> [...]
Applied to arm64 (for-next/cpufeature), thanks!
[1/1] arm64/cpufeatures/kvm: Add ARMv8.9 FEAT_ECBHB bits in ID_AA64MMFR1 register
https://git.kernel.org/arm64/c/e8cde32f111f
--
Catalin
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