From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by smtp.lore.kernel.org (Postfix) with ESMTP id 9D38AC43219 for ; Mon, 29 Nov 2021 20:09:58 +0000 (UTC) Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S234337AbhK2UNN (ORCPT ); Mon, 29 Nov 2021 15:13:13 -0500 Received: from sin.source.kernel.org ([145.40.73.55]:50598 "EHLO sin.source.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1348444AbhK2UJk (ORCPT ); Mon, 29 Nov 2021 15:09:40 -0500 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id DB63BCE13DE for ; Mon, 29 Nov 2021 20:06:20 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 14815C53FAD; Mon, 29 Nov 2021 20:06:19 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1638216379; bh=4TJi1kUBu6v9+wzbXvDlDzBwCOCb2L+5EUFbJIjb+NQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=VkSRkgJHQr9xrb4whnF2jgDS9//gz7hb68jmqK9tnQkBV5Dskcve3TZwVYfx8eCQN e7CKNBKi2W+S9CeyZAsDYpVby4VmvZNfp78NNxejjMl2K4MgOGrl22RBz/xpXyHxpO qlZm0KaWVxo7etXipoP/bRpSu7KS7NKc0Ury/iPuP/dBBE2CRNuLat30vjvgahzxFO qtGNoDvZskbvW7Ndef+0zGm+ssFYQvfT6WiGkrz/LGxxE22htXErzW1Uko/F1V4CXH +zT5JGINnmZpgqx8aALYBByhDssFK9l9bEletvFM0kTtmfD6RuOm4VGsDTpIhHrYRX +eraax23+If7w== Received: from sofa.misterjones.org ([185.219.108.64] helo=why.lan) by disco-boy.misterjones.org with esmtpsa (TLS1.3) tls TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384 (Exim 4.94.2) (envelope-from ) id 1mrmqr-008gvR-3Z; Mon, 29 Nov 2021 20:02:13 +0000 From: Marc Zyngier To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org Cc: Andre Przywara , Christoffer Dall , Jintack Lim , Haibo Xu , Ganapatrao Kulkarni , James Morse , Suzuki K Poulose , Alexandru Elisei , kernel-team@android.com Subject: [PATCH v5 12/69] KVM: arm64: nv: Handle HCR_EL2.NV system register traps Date: Mon, 29 Nov 2021 20:00:53 +0000 Message-Id: <20211129200150.351436-13-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20211129200150.351436-1-maz@kernel.org> References: <20211129200150.351436-1-maz@kernel.org> MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-SA-Exim-Connect-IP: 185.219.108.64 X-SA-Exim-Rcpt-To: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, kvm@vger.kernel.org, andre.przywara@arm.com, christoffer.dall@arm.com, jintack@cs.columbia.edu, haibo.xu@linaro.org, gankulkarni@os.amperecomputing.com, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, kernel-team@android.com X-SA-Exim-Mail-From: maz@kernel.org X-SA-Exim-Scanned: No (on disco-boy.misterjones.org); SAEximRunCond expanded to false Precedence: bulk List-ID: X-Mailing-List: kvm@vger.kernel.org From: Jintack Lim ARM v8.3 introduces a new bit in the HCR_EL2, which is the NV bit. When this bit is set, accessing EL2 registers in EL1 traps to EL2. In addition, executing the following instructions in EL1 will trap to EL2: tlbi, at, eret, and msr/mrs instructions to access SP_EL1. Most of the instructions that trap to EL2 with the NV bit were undef at EL1 prior to ARM v8.3. The only instruction that was not undef is eret. This patch sets up a handler for EL2 registers and SP_EL1 register accesses at EL1. The host hypervisor keeps those register values in memory, and will emulate their behavior. This patch doesn't set the NV bit yet. It will be set in a later patch once nested virtualization support is completed. Signed-off-by: Jintack Lim [maz: added SCTLR_EL2 RES0/RES1 handling] Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/sysreg.h | 41 +++++++++++- arch/arm64/kvm/sys_regs.c | 109 ++++++++++++++++++++++++++++++-- 2 files changed, 144 insertions(+), 6 deletions(-) diff --git a/arch/arm64/include/asm/sysreg.h b/arch/arm64/include/asm/sysreg.h index 615dd6278f8b..c77fe5401826 100644 --- a/arch/arm64/include/asm/sysreg.h +++ b/arch/arm64/include/asm/sysreg.h @@ -531,10 +531,26 @@ #define SYS_PMCCFILTR_EL0 sys_reg(3, 3, 14, 15, 7) +#define SYS_VPIDR_EL2 sys_reg(3, 4, 0, 0, 0) +#define SYS_VMPIDR_EL2 sys_reg(3, 4, 0, 0, 5) + #define SYS_SCTLR_EL2 sys_reg(3, 4, 1, 0, 0) +#define SYS_ACTLR_EL2 sys_reg(3, 4, 1, 0, 1) +#define SYS_HCR_EL2 sys_reg(3, 4, 1, 1, 0) +#define SYS_MDCR_EL2 sys_reg(3, 4, 1, 1, 1) +#define SYS_CPTR_EL2 sys_reg(3, 4, 1, 1, 2) +#define SYS_HSTR_EL2 sys_reg(3, 4, 1, 1, 3) #define SYS_HFGRTR_EL2 sys_reg(3, 4, 1, 1, 4) #define SYS_HFGWTR_EL2 sys_reg(3, 4, 1, 1, 5) #define SYS_HFGITR_EL2 sys_reg(3, 4, 1, 1, 6) +#define SYS_HACR_EL2 sys_reg(3, 4, 1, 1, 7) + +#define SYS_TTBR0_EL2 sys_reg(3, 4, 2, 0, 0) +#define SYS_TTBR1_EL2 sys_reg(3, 4, 2, 0, 1) +#define SYS_TCR_EL2 sys_reg(3, 4, 2, 0, 2) +#define SYS_VTTBR_EL2 sys_reg(3, 4, 2, 1, 0) +#define SYS_VTCR_EL2 sys_reg(3, 4, 2, 1, 2) + #define SYS_ZCR_EL2 sys_reg(3, 4, 1, 2, 0) #define SYS_TRFCR_EL2 sys_reg(3, 4, 1, 2, 1) #define SYS_DACR32_EL2 sys_reg(3, 4, 3, 0, 0) @@ -543,14 +559,26 @@ #define SYS_HAFGRTR_EL2 sys_reg(3, 4, 3, 1, 6) #define SYS_SPSR_EL2 sys_reg(3, 4, 4, 0, 0) #define SYS_ELR_EL2 sys_reg(3, 4, 4, 0, 1) +#define SYS_SP_EL1 sys_reg(3, 4, 4, 1, 0) #define SYS_IFSR32_EL2 sys_reg(3, 4, 5, 0, 1) +#define SYS_AFSR0_EL2 sys_reg(3, 4, 5, 1, 0) +#define SYS_AFSR1_EL2 sys_reg(3, 4, 5, 1, 1) #define SYS_ESR_EL2 sys_reg(3, 4, 5, 2, 0) #define SYS_VSESR_EL2 sys_reg(3, 4, 5, 2, 3) #define SYS_FPEXC32_EL2 sys_reg(3, 4, 5, 3, 0) #define SYS_TFSR_EL2 sys_reg(3, 4, 5, 6, 0) #define SYS_FAR_EL2 sys_reg(3, 4, 6, 0, 0) -#define SYS_VDISR_EL2 sys_reg(3, 4, 12, 1, 1) +#define SYS_FAR_EL2 sys_reg(3, 4, 6, 0, 0) +#define SYS_HPFAR_EL2 sys_reg(3, 4, 6, 0, 4) + +#define SYS_MAIR_EL2 sys_reg(3, 4, 10, 2, 0) +#define SYS_AMAIR_EL2 sys_reg(3, 4, 10, 3, 0) + +#define SYS_VBAR_EL2 sys_reg(3, 4, 12, 0, 0) +#define SYS_RVBAR_EL2 sys_reg(3, 4, 12, 0, 1) +#define SYS_RMR_EL2 sys_reg(3, 4, 12, 0, 2) +#define SYS_VDISR_EL2 sys_reg(3, 4, 12, 1, 1) #define __SYS__AP0Rx_EL2(x) sys_reg(3, 4, 12, 8, x) #define SYS_ICH_AP0R0_EL2 __SYS__AP0Rx_EL2(0) #define SYS_ICH_AP0R1_EL2 __SYS__AP0Rx_EL2(1) @@ -592,15 +620,24 @@ #define SYS_ICH_LR14_EL2 __SYS__LR8_EL2(6) #define SYS_ICH_LR15_EL2 __SYS__LR8_EL2(7) +#define SYS_CONTEXTIDR_EL2 sys_reg(3, 4, 13, 0, 1) +#define SYS_TPIDR_EL2 sys_reg(3, 4, 13, 0, 2) + +#define SYS_CNTVOFF_EL2 sys_reg(3, 4, 14, 0, 3) +#define SYS_CNTHCTL_EL2 sys_reg(3, 4, 14, 1, 0) + /* VHE encodings for architectural EL0/1 system registers */ #define SYS_SCTLR_EL12 sys_reg(3, 5, 1, 0, 0) #define SYS_CPACR_EL12 sys_reg(3, 5, 1, 0, 2) #define SYS_ZCR_EL12 sys_reg(3, 5, 1, 2, 0) + #define SYS_TTBR0_EL12 sys_reg(3, 5, 2, 0, 0) #define SYS_TTBR1_EL12 sys_reg(3, 5, 2, 0, 1) #define SYS_TCR_EL12 sys_reg(3, 5, 2, 0, 2) + #define SYS_SPSR_EL12 sys_reg(3, 5, 4, 0, 0) #define SYS_ELR_EL12 sys_reg(3, 5, 4, 0, 1) + #define SYS_AFSR0_EL12 sys_reg(3, 5, 5, 1, 0) #define SYS_AFSR1_EL12 sys_reg(3, 5, 5, 1, 1) #define SYS_ESR_EL12 sys_reg(3, 5, 5, 2, 0) @@ -618,6 +655,8 @@ #define SYS_CNTV_CTL_EL02 sys_reg(3, 5, 14, 3, 1) #define SYS_CNTV_CVAL_EL02 sys_reg(3, 5, 14, 3, 2) +#define SYS_SP_EL2 sys_reg(3, 6, 4, 1, 0) + /* Common SCTLR_ELx flags. */ #define SCTLR_ELx_DSSBS (BIT(44)) #define SCTLR_ELx_ATA (BIT(43)) diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index e3ec1a44f94d..a23701f29858 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -105,6 +105,46 @@ static u32 get_ccsidr(u32 csselr) return ccsidr; } +static bool access_rw(struct kvm_vcpu *vcpu, + struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (p->is_write) + vcpu_write_sys_reg(vcpu, p->regval, r->reg); + else + p->regval = vcpu_read_sys_reg(vcpu, r->reg); + + return true; +} + +static bool access_sctlr_el2(struct kvm_vcpu *vcpu, + struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (p->is_write) { + u64 val = p->regval; + + if (vcpu_el2_e2h_is_set(vcpu) && vcpu_el2_tge_is_set(vcpu)) { + val &= ~(GENMASK_ULL(63,45) | GENMASK_ULL(34, 32) | + BIT_ULL(17) | BIT_ULL(9)); + val |= SCTLR_EL1_RES1; + } else { + val &= ~(GENMASK_ULL(63,45) | BIT_ULL(42) | + GENMASK_ULL(39, 38) | GENMASK_ULL(35, 32) | + BIT_ULL(26) | BIT_ULL(24) | BIT_ULL(20) | + BIT_ULL(17) | GENMASK_ULL(15, 14) | + GENMASK(10, 7)); + val |= SCTLR_EL2_RES1; + } + + vcpu_write_sys_reg(vcpu, val, r->reg); + } else { + p->regval = vcpu_read_sys_reg(vcpu, r->reg); + } + + return true; +} + /* * See note at ARMv7 ARM B1.14.4 (TL;DR: S/W ops are not easily virtualized). */ @@ -263,6 +303,14 @@ static bool trap_raz_wi(struct kvm_vcpu *vcpu, return read_zero(vcpu, p); } +static bool trap_undef(struct kvm_vcpu *vcpu, + struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + kvm_inject_undefined(vcpu); + return false; +} + /* * ARMv8.1 mandates at least a trivial LORegion implementation, where all the * RW registers are RES0 (which we can implement as RAZ/WI). On an ARMv8.0 @@ -342,12 +390,9 @@ static bool trap_debug_regs(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) { - if (p->is_write) { - vcpu_write_sys_reg(vcpu, p->regval, r->reg); + access_rw(vcpu, p, r); + if (p->is_write) vcpu->arch.flags |= KVM_ARM64_DEBUG_DIRTY; - } else { - p->regval = vcpu_read_sys_reg(vcpu, r->reg); - } trace_trap_reg(__func__, r->reg, p->is_write, p->regval); @@ -1411,6 +1456,18 @@ static unsigned int mte_visibility(const struct kvm_vcpu *vcpu, .set_user = set_raz_id_reg, \ } +static bool access_sp_el1(struct kvm_vcpu *vcpu, + struct sys_reg_params *p, + const struct sys_reg_desc *r) +{ + if (p->is_write) + __vcpu_sys_reg(vcpu, SP_EL1) = p->regval; + else + p->regval = __vcpu_sys_reg(vcpu, SP_EL1); + + return true; +} + /* * Architected system registers. * Important: Must be sorted ascending by Op0, Op1, CRn, CRm, Op2 @@ -1825,9 +1882,51 @@ static const struct sys_reg_desc sys_reg_descs[] = { { PMU_SYS_REG(SYS_PMCCFILTR_EL0), .access = access_pmu_evtyper, .reset = reset_val, .reg = PMCCFILTR_EL0, .val = 0 }, + { SYS_DESC(SYS_VPIDR_EL2), access_rw, reset_val, VPIDR_EL2, 0 }, + { SYS_DESC(SYS_VMPIDR_EL2), access_rw, reset_val, VMPIDR_EL2, 0 }, + + { SYS_DESC(SYS_SCTLR_EL2), access_sctlr_el2, reset_val, SCTLR_EL2, SCTLR_EL2_RES1 }, + { SYS_DESC(SYS_ACTLR_EL2), access_rw, reset_val, ACTLR_EL2, 0 }, + { SYS_DESC(SYS_HCR_EL2), access_rw, reset_val, HCR_EL2, 0 }, + { SYS_DESC(SYS_MDCR_EL2), access_rw, reset_val, MDCR_EL2, 0 }, + { SYS_DESC(SYS_CPTR_EL2), access_rw, reset_val, CPTR_EL2, CPTR_EL2_DEFAULT }, + { SYS_DESC(SYS_HSTR_EL2), access_rw, reset_val, HSTR_EL2, 0 }, + { SYS_DESC(SYS_HACR_EL2), access_rw, reset_val, HACR_EL2, 0 }, + + { SYS_DESC(SYS_TTBR0_EL2), access_rw, reset_val, TTBR0_EL2, 0 }, + { SYS_DESC(SYS_TTBR1_EL2), access_rw, reset_val, TTBR1_EL2, 0 }, + { SYS_DESC(SYS_TCR_EL2), access_rw, reset_val, TCR_EL2, TCR_EL2_RES1 }, + { SYS_DESC(SYS_VTTBR_EL2), access_rw, reset_val, VTTBR_EL2, 0 }, + { SYS_DESC(SYS_VTCR_EL2), access_rw, reset_val, VTCR_EL2, 0 }, + { SYS_DESC(SYS_DACR32_EL2), NULL, reset_unknown, DACR32_EL2 }, + { SYS_DESC(SYS_SPSR_EL2), access_rw, reset_val, SPSR_EL2, 0 }, + { SYS_DESC(SYS_ELR_EL2), access_rw, reset_val, ELR_EL2, 0 }, + { SYS_DESC(SYS_SP_EL1), access_sp_el1}, + { SYS_DESC(SYS_IFSR32_EL2), NULL, reset_unknown, IFSR32_EL2 }, + { SYS_DESC(SYS_AFSR0_EL2), access_rw, reset_val, AFSR0_EL2, 0 }, + { SYS_DESC(SYS_AFSR1_EL2), access_rw, reset_val, AFSR1_EL2, 0 }, + { SYS_DESC(SYS_ESR_EL2), access_rw, reset_val, ESR_EL2, 0 }, { SYS_DESC(SYS_FPEXC32_EL2), NULL, reset_val, FPEXC32_EL2, 0x700 }, + + { SYS_DESC(SYS_FAR_EL2), access_rw, reset_val, FAR_EL2, 0 }, + { SYS_DESC(SYS_HPFAR_EL2), access_rw, reset_val, HPFAR_EL2, 0 }, + + { SYS_DESC(SYS_MAIR_EL2), access_rw, reset_val, MAIR_EL2, 0 }, + { SYS_DESC(SYS_AMAIR_EL2), access_rw, reset_val, AMAIR_EL2, 0 }, + + { SYS_DESC(SYS_VBAR_EL2), access_rw, reset_val, VBAR_EL2, 0 }, + { SYS_DESC(SYS_RVBAR_EL2), access_rw, reset_val, RVBAR_EL2, 0 }, + { SYS_DESC(SYS_RMR_EL2), trap_undef }, + + { SYS_DESC(SYS_CONTEXTIDR_EL2), access_rw, reset_val, CONTEXTIDR_EL2, 0 }, + { SYS_DESC(SYS_TPIDR_EL2), access_rw, reset_val, TPIDR_EL2, 0 }, + + { SYS_DESC(SYS_CNTVOFF_EL2), access_rw, reset_val, CNTVOFF_EL2, 0 }, + { SYS_DESC(SYS_CNTHCTL_EL2), access_rw, reset_val, CNTHCTL_EL2, 0 }, + + { SYS_DESC(SYS_SP_EL2), NULL, reset_unknown, SP_EL2 }, }; static bool trap_dbgdidr(struct kvm_vcpu *vcpu, -- 2.30.2