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From: Oliver Upton To: Sebastian Ott Cc: Marc Zyngier , Joey Gouly , Suzuki K Poulose , Zenghui Yu , Catalin Marinas , Will Deacon , linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org Subject: Re: [PATCH] KVM: arm64: Writable TGRAN*_2 Message-ID: References: <20250306184013.30008-1-sebott@redhat.com> MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: X-Migadu-Flow: FLOW_OUT X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250312_103215_058173_B78DBDEB X-CRM114-Status: GOOD ( 24.31 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.34 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Wed, Mar 12, 2025 at 10:20:03AM -0700, Oliver Upton wrote: > Hi Sebastian, > > On Thu, Mar 06, 2025 at 07:40:13PM +0100, Sebastian Ott wrote: > > Allow userspace to write the safe (NI) value for ID_AA64MMFR0_EL1.TGRAN*_2. > > Disallow to change these fields for NV since kvm provides a sanitized view > > for them based on the PAGE_SIZE. > > Also add these bits to the set_id_regs selftest. > > > > Signed-off-by: Sebastian Ott > > I can't tell what you've based this patch on, it certainly doesn't apply > on a 6.14 rc. Consider telling git to include the base commit next time > you generate a patch. /me finishes a cup of coffee The conflict is obviously with 9d6745572899 ("KVM: arm64: Hide ID_AA64MMFR2_EL1.NV from guest and userspace"), which is in kvmarm/next... > > --- > > arch/arm64/kvm/sys_regs.c | 21 +++++++++++++++---- > > .../testing/selftests/kvm/arm64/set_id_regs.c | 3 +++ > > 2 files changed, 20 insertions(+), 4 deletions(-) > > > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > > index 14faf213d483..0730ed8314d0 100644 > > --- a/arch/arm64/kvm/sys_regs.c > > +++ b/arch/arm64/kvm/sys_regs.c > > @@ -1948,6 +1948,21 @@ static int set_id_aa64pfr1_el1(struct kvm_vcpu *vcpu, > > return set_id_reg(vcpu, rd, user_val); > > } > > > > +static int set_id_aa64mmfr0_el1(struct kvm_vcpu *vcpu, > > + const struct sys_reg_desc *rd, u64 user_val) > > +{ > > + u64 sanitized_val = kvm_read_sanitised_id_reg(vcpu, rd); > > + u64 tgran2_mask = ID_AA64MMFR0_EL1_TGRAN4_2_MASK | > > + ID_AA64MMFR0_EL1_TGRAN16_2_MASK | > > + ID_AA64MMFR0_EL1_TGRAN64_2_MASK; > > + > > + if (vcpu_has_nv(vcpu) && > > + ((sanitized_val & tgran2_mask) != (user_val & tgran2_mask))) > > + return -EINVAL; > > + > > + return set_id_reg(vcpu, rd, user_val); > > +} > > + > > static int set_id_aa64mmfr2_el1(struct kvm_vcpu *vcpu, > > const struct sys_reg_desc *rd, u64 user_val) > > { > > @@ -2787,10 +2802,8 @@ static const struct sys_reg_desc sys_reg_descs[] = { > > ID_UNALLOCATED(6,7), > > > > /* CRm=7 */ > > - ID_WRITABLE(ID_AA64MMFR0_EL1, ~(ID_AA64MMFR0_EL1_RES0 | > > - ID_AA64MMFR0_EL1_TGRAN4_2 | > > - ID_AA64MMFR0_EL1_TGRAN64_2 | > > - ID_AA64MMFR0_EL1_TGRAN16_2 | > > + ID_FILTERED(ID_AA64MMFR0_EL1, id_aa64mmfr0_el1, > > + ~(ID_AA64MMFR0_EL1_RES0 | > > ID_AA64MMFR0_EL1_ASIDBITS)), > > ID_WRITABLE(ID_AA64MMFR1_EL1, ~(ID_AA64MMFR1_EL1_RES0 | > > ID_AA64MMFR1_EL1_HCX | > > diff --git a/tools/testing/selftests/kvm/arm64/set_id_regs.c b/tools/testing/selftests/kvm/arm64/set_id_regs.c > > index 1d65f4a09e6f..322b9d3b0125 100644 > > --- a/tools/testing/selftests/kvm/arm64/set_id_regs.c > > +++ b/tools/testing/selftests/kvm/arm64/set_id_regs.c > > @@ -146,6 +146,9 @@ static const struct reg_ftr_bits ftr_id_aa64pfr1_el1[] = { > > static const struct reg_ftr_bits ftr_id_aa64mmfr0_el1[] = { > > REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR0_EL1, ECV, 0), > > REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR0_EL1, EXS, 0), > > + REG_FTR_BITS(FTR_EXACT, ID_AA64MMFR0_EL1, TGRAN4_2, 1), > > + REG_FTR_BITS(FTR_EXACT, ID_AA64MMFR0_EL1, TGRAN64_2, 1), > > + REG_FTR_BITS(FTR_EXACT, ID_AA64MMFR0_EL1, TGRAN16_2, 1), > > S_REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR0_EL1, TGRAN4, 0), > > S_REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR0_EL1, TGRAN64, 0), > > REG_FTR_BITS(FTR_LOWER_SAFE, ID_AA64MMFR0_EL1, TGRAN16, 0), > > Please do selftests changes in a separate patch. > > Don't worry about respinning, I'll fix this up and queue it in a moment. > > Thanks, > Oliver >