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Tue, 22 Aug 2023 08:10:39 +0100 Date: Tue, 22 Aug 2023 08:10:33 +0100 Message-ID: <877cpnpn6e.wl-maz@kernel.org> From: Marc Zyngier To: Jing Zhang Cc: KVM , KVMARM , ARMLinux , Oliver Upton , Will Deacon , Paolo Bonzini , James Morse , Alexandru Elisei , Suzuki K Poulose , Fuad Tabba , Reiji Watanabe , Raghavendra Rao Ananta , Suraj Jitindar Singh , Cornelia Huck , Shaoqin Huang Subject: Re: [PATCH v9 07/11] KVM: arm64: Enable writable for ID_AA64PFR0_EL1 In-Reply-To: <20230821212243.491660-8-jingzhangos@google.com> References: <20230821212243.491660-1-jingzhangos@google.com> <20230821212243.491660-8-jingzhangos@google.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/28.2 (x86_64-pc-linux-gnu) MULE/6.0 (HANACHIRUSATO) MIME-Version: 1.0 (generated by SEMI-EPG 1.14.7 - "Harue") X-SA-Exim-Connect-IP: 185.104.136.29 X-SA-Exim-Rcpt-To: jingzhangos@google.com, kvm@vger.kernel.org, kvmarm@lists.linux.dev, linux-arm-kernel@lists.infradead.org, oliver.upton@linux.dev, will@kernel.org, pbonzini@redhat.com, james.morse@arm.com, alexandru.elisei@arm.com, suzuki.poulose@arm.com, tabba@google.com, reijiw@google.com, rananta@google.com, surajjs@amazon.com, cohuck@redhat.com, shahuang@redhat.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20230822_081051_527013_3B112A44 X-CRM114-Status: GOOD ( 19.99 ) 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: , Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+linux-arm-kernel=archiver.kernel.org@lists.infradead.org On Mon, 21 Aug 2023 22:22:39 +0100, Jing Zhang wrote: > > All valid fields in ID_AA64PFR0_EL1 are writable from userspace > with this change except AMU field which isn't exposed by KVM. > > Signed-off-by: Jing Zhang > --- > arch/arm64/kvm/sys_regs.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index cee5f879df19..bf716f646872 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -2043,7 +2043,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { > .get_user = get_id_reg, > .set_user = set_id_reg, > .reset = read_sanitised_id_aa64pfr0_el1, > - .val = ID_AA64PFR0_EL1_CSV2_MASK | ID_AA64PFR0_EL1_CSV3_MASK, }, > + .val = ~ID_AA64PFR0_EL1_AMU_MASK, }, > ID_SANITISED(ID_AA64PFR1_EL1), > ID_UNALLOCATED(4,2), > ID_UNALLOCATED(4,3), Same thing. Does it mean we can disable the GIC? Or FP? Have you taken my previous comment about the AMU as the only issue? M. -- Without deviation from the norm, progress is not possible. _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel