linux-kernel - Re: [PATCH] arm64/cpufeatures/kvm: Add ARMv8.9 FEAT_ECBHB bits in ID

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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