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Mon, 02 Mar 2026 17:54:02 +0000 Date: Mon, 02 Mar 2026 17:54:01 +0000 Message-ID: <86ms0q86di.wl-maz@kernel.org> From: Marc Zyngier To: Ben Horgan Cc: amitsinght@marvell.com, baisheng.gao@unisoc.com, baolin.wang@linux.alibaba.com, carl@os.amperecomputing.com, dave.martin@arm.com, david@kernel.org, dfustini@baylibre.com, fenghuay@nvidia.com, gshan@redhat.com, james.morse@arm.com, jonathan.cameron@huawei.com, kobak@nvidia.com, lcherian@marvell.com, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org, peternewman@google.com, punit.agrawal@oss.qualcomm.com, quic_jiles@quicinc.com, reinette.chatre@intel.com, rohit.mathew@arm.com, scott@os.amperecomputing.com, sdonthineni@nvidia.com, tan.shaopeng@fujitsu.com, xhao@linux.alibaba.com, catalin.marinas@arm.com, will@kernel.org, corbet@lwn.net, oupton@kernel.org, joey.gouly@arm.com, suzuki.poulose@arm.com, kvmarm@lists.linux.dev, zengheng4@huawei.com, linux-doc@vger.kernel.org, Shaopeng Tan Subject: Re: [PATCH v5 03/41] KVM: arm64: Make MPAMSM_EL1 accesses UNDEF In-Reply-To: <20260224175720.2663924-4-ben.horgan@arm.com> References: <20260224175720.2663924-1-ben.horgan@arm.com> <20260224175720.2663924-4-ben.horgan@arm.com> User-Agent: Wanderlust/2.15.9 (Almost Unreal) SEMI-EPG/1.14.7 (Harue) FLIM-LB/1.14.9 (=?UTF-8?B?R29qxY0=?=) APEL-LB/10.8 EasyPG/1.0.0 Emacs/30.1 (aarch64-unknown-linux-gnu) MULE/6.0 (HANACHIRUSATO) Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") Content-Type: text/plain; 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SAEximRunCond expanded to false On Tue, 24 Feb 2026 17:56:42 +0000, Ben Horgan wrote: > > The MPAMSM_EL1 controls the MPAM labeling for an SMCU, Streaming Mode nit: The MPAMSM_EL1 *register* controls... > Compute Unit. As there is on MPAM support in kvm, make sure MPAMSM_EL1 s/on/no/, s/kvm/KVM/. > accesses trigger an UNDEF. > > Tested-by: Gavin Shan > Tested-by: Shaopeng Tan > Tested-by: Peter Newman > Tested-by: Zeng Heng > Reviewed-by: Shaopeng Tan > Reviewed-by: Jonathan Cameron > Reviewed-by: Gavin Shan > Signed-off-by: Ben Horgan > --- > Changes since v2: > Remove paragraph from commit on allowed range of values > --- > arch/arm64/kvm/sys_regs.c | 2 ++ > 1 file changed, 2 insertions(+) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index a7cd0badc20c..2c9a52e66fe0 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -3373,6 +3373,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { > > { SYS_DESC(SYS_MPAM1_EL1), undef_access }, > { SYS_DESC(SYS_MPAM0_EL1), undef_access }, > + { SYS_DESC(SYS_MPAMSM_EL1), undef_access }, > + > { SYS_DESC(SYS_VBAR_EL1), access_rw, reset_val, VBAR_EL1, 0 }, > { SYS_DESC(SYS_DISR_EL1), NULL, reset_val, DISR_EL1, 0 }, > Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.