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Received: from localhost ([127.0.0.1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hhzLm-0006QF-MO; Mon, 01 Jul 2019 16:40:18 +0000 Received: from foss.arm.com ([217.140.110.172]) by bombadil.infradead.org with esmtp (Exim 4.92 #3 (Red Hat Linux)) id 1hhzLk-0006Pq-B5 for linux-arm-kernel@lists.infradead.org; Mon, 01 Jul 2019 16:40:17 +0000 Received: from usa-sjc-imap-foss1.foss.arm.com (unknown [10.121.207.14]) by usa-sjc-mx-foss1.foss.arm.com (Postfix) with ESMTP id 81FC92B; Mon, 1 Jul 2019 09:40:15 -0700 (PDT) Received: from [10.1.31.185] (unknown [10.1.31.185]) by usa-sjc-imap-foss1.foss.arm.com (Postfix) with ESMTPSA id ABACA3F703; Mon, 1 Jul 2019 09:40:14 -0700 (PDT) Subject: Re: [PATCH 20/59] KVM: arm64: nv: Trap CPACR_EL1 access in virtual EL2 To: Marc Zyngier , linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org References: <20190621093843.220980-1-marc.zyngier@arm.com> <20190621093843.220980-21-marc.zyngier@arm.com> From: Alexandru Elisei Message-ID: Date: Mon, 1 Jul 2019 17:40:13 +0100 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:60.0) Gecko/20100101 Thunderbird/60.7.0 MIME-Version: 1.0 In-Reply-To: <20190621093843.220980-21-marc.zyngier@arm.com> Content-Language: en-US X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20190701_094016_427449_58D1F0DE X-CRM114-Status: GOOD ( 18.29 ) X-BeenThere: linux-arm-kernel@lists.infradead.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Andre Przywara , Dave Martin Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Sender: "linux-arm-kernel" Errors-To: linux-arm-kernel-bounces+infradead-linux-arm-kernel=archiver.kernel.org@lists.infradead.org On 6/21/19 10:38 AM, Marc Zyngier wrote: > From: Jintack Lim > > For the same reason we trap virtual memory register accesses in virtual > EL2, we trap CPACR_EL1 access too; We allow the virtual EL2 mode to > access EL1 system register state instead of the virtual EL2 one. > > Signed-off-by: Jintack Lim > Signed-off-by: Marc Zyngier > --- > arch/arm64/include/asm/kvm_arm.h | 3 ++- > arch/arm64/kvm/hyp/switch.c | 2 ++ > arch/arm64/kvm/sys_regs.c | 2 +- > 3 files changed, 5 insertions(+), 2 deletions(-) > > diff --git a/arch/arm64/include/asm/kvm_arm.h b/arch/arm64/include/asm/kvm_arm.h > index b2e363ac624d..48e15af2bece 100644 > --- a/arch/arm64/include/asm/kvm_arm.h > +++ b/arch/arm64/include/asm/kvm_arm.h > @@ -278,12 +278,13 @@ > #define CPTR_EL2_TFP_SHIFT 10 > > /* Hyp Coprocessor Trap Register */ > -#define CPTR_EL2_TCPAC (1 << 31) > +#define CPTR_EL2_TCPAC (1U << 31) > #define CPTR_EL2_TTA (1 << 20) > #define CPTR_EL2_TFP (1 << CPTR_EL2_TFP_SHIFT) > #define CPTR_EL2_TZ (1 << 8) > #define CPTR_EL2_RES1 0x000032ff /* known RES1 bits in CPTR_EL2 */ > #define CPTR_EL2_DEFAULT CPTR_EL2_RES1 > +#define CPTR_EL2_E2H_TCPAC (1U << 31) I'm not sure why CPTR_EL2_TCPAC is being renamed to CPTR_EL2_E2H_TCPAC. CPTR_EL2.TCPAC is always bit 31, regardless of the value of HCR_EL2.E2H. I also did a grep and it's only used in the one place added by this patch. > > /* Hyp Debug Configuration Register bits */ > #define MDCR_EL2_TPMS (1 << 14) > diff --git a/arch/arm64/kvm/hyp/switch.c b/arch/arm64/kvm/hyp/switch.c > index 791b26570347..62359c7c3d6b 100644 > --- a/arch/arm64/kvm/hyp/switch.c > +++ b/arch/arm64/kvm/hyp/switch.c > @@ -108,6 +108,8 @@ static void activate_traps_vhe(struct kvm_vcpu *vcpu) > val &= ~CPACR_EL1_FPEN; > __activate_traps_fpsimd32(vcpu); > } > + if (vcpu_mode_el2(vcpu) && !vcpu_el2_e2h_is_set(vcpu)) > + val |= CPTR_EL2_E2H_TCPAC; > > write_sysreg(val, cpacr_el1); > > diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c > index 7fc87657382d..1d1312425cf2 100644 > --- a/arch/arm64/kvm/sys_regs.c > +++ b/arch/arm64/kvm/sys_regs.c > @@ -1773,7 +1773,7 @@ static const struct sys_reg_desc sys_reg_descs[] = { > ID_UNALLOCATED(7,7), > > { SYS_DESC(SYS_SCTLR_EL1), access_vm_reg, reset_val, SCTLR_EL1, 0x00C50078 }, > - { SYS_DESC(SYS_CPACR_EL1), NULL, reset_val, CPACR_EL1, 0 }, > + { SYS_DESC(SYS_CPACR_EL1), access_rw, reset_val, CPACR_EL1, 0 }, > { SYS_DESC(SYS_ZCR_EL1), NULL, reset_val, ZCR_EL1, 0, .visibility = sve_visibility }, > { SYS_DESC(SYS_TTBR0_EL1), access_vm_reg, reset_unknown, TTBR0_EL1 }, > { SYS_DESC(SYS_TTBR1_EL1), access_vm_reg, reset_unknown, TTBR1_EL1 }, _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel