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Wed, 02 Jul 2025 18:12:57 +0100 Date: Wed, 02 Jul 2025 18:12:56 +0100 Message-ID: <86ecuybjon.wl-maz@kernel.org> From: Marc Zyngier To: Yeoreum Yun Cc: catalin.marinas@arm.com, pcc@google.com, will@kernel.org, broonie@kernel.org, anshuman.khandual@arm.com, joey.gouly@arm.com, oliver.upton@linux.dev, frederic@kernel.org, hardevsinh.palaniya@siliconsignals.io, samuel.holland@sifive.com, palmer@rivosinc.com, charlie@rivosinc.com, thiago.bauermann@linaro.org, bgray@linux.ibm.com, tglx@linutronix.de, puranjay@kernel.org, david@redhat.com, yang@os.amperecomputing.com, mbenes@suse.cz, joel.granados@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org Subject: Re: [PATCH v7 5/8] arm64/kvm: expose MTE_STORE_ONLY feature to guest In-Reply-To: <20250618092957.2069907-6-yeoreum.yun@arm.com> References: <20250618092957.2069907-1-yeoreum.yun@arm.com> <20250618092957.2069907-6-yeoreum.yun@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; charset=US-ASCII X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: yeoreum.yun@arm.com, catalin.marinas@arm.com, pcc@google.com, will@kernel.org, broonie@kernel.org, anshuman.khandual@arm.com, joey.gouly@arm.com, oliver.upton@linux.dev, frederic@kernel.org, hardevsinh.palaniya@siliconsignals.io, samuel.holland@sifive.com, palmer@rivosinc.com, charlie@rivosinc.com, thiago.bauermann@linaro.org, bgray@linux.ibm.com, tglx@linutronix.de, puranjay@kernel.org, david@redhat.com, yang@os.amperecomputing.com, mbenes@suse.cz, joel.granados@kernel.org, linux-arm-kernel@lists.infradead.org, linux-kernel@vger.kernel.org X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false On Wed, 18 Jun 2025 10:29:54 +0100, Yeoreum Yun wrote: > > expose MTE_STORE_ONLY feature to guest. > > Signed-off-by: Yeoreum Yun > --- > arch/arm64/kvm/sys_regs.c | 6 ++++-- > 1 file changed, 4 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index c8c92cb9da01..7bc99ed201eb 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -1620,7 +1620,8 @@ static u64 __kvm_read_sanitised_id_reg(const struct kvm_vcpu *vcpu, > mask = ID_AA64PFR2_EL1_FPMR; > > if (kvm_has_mte(vcpu->kvm)) > - mask |= ID_AA64PFR2_EL1_MTEFAR; > + mask |= ID_AA64PFR2_EL1_MTEFAR | > + ID_AA64PFR2_EL1_MTESTOREONLY; > > val &= mask; > break; > @@ -2884,7 +2885,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { > ID_AA64PFR1_EL1_MTE)), > ID_WRITABLE(ID_AA64PFR2_EL1, > ID_AA64PFR2_EL1_FPMR | > - ID_AA64PFR2_EL1_MTEFAR), > + ID_AA64PFR2_EL1_MTEFAR | > + ID_AA64PFR2_EL1_MTESTOREONLY), > ID_UNALLOCATED(4,3), > ID_WRITABLE(ID_AA64ZFR0_EL1, ~ID_AA64ZFR0_EL1_RES0), > ID_HIDDEN(ID_AA64SMFR0_EL1), With the subject line fixed: Acked-by: Marc Zyngier M. -- Without deviation from the norm, progress is not possible.