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 bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id 76DCBC433F5 for ; Fri, 28 Jan 2022 13:11:33 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:MIME-Version:References:In-Reply-To: Message-Id:Date:Subject:Cc:To:From:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Owner; bh=qV6408Ya7qiNXugoaJ+KST865+TN+nq4KcjmctkBLjI=; b=EfJW1VsvXbSnA7 AhghXShSI+XEKgYzIS3s88p1opZtTLDWvVy/XF7R6FLvdgCSVNGv3ZGYNuFUHzdCeSktjdem1j1Y+ u8FFiybZ3whpvvRXxJaGiFc3MfAUwf5nKZH6srjZ6Gdx8DAZYBzQd31EYd0okgD6fF26/xUTUDW49 s/DvFxAGD++dxgO0TCWjrr2WfyYYPGJTMfGsbtF79lIoz/4tRNEJRyvbH67PWYvW2BiLmzLE2KoYE ahxQ5lsdr03HVjNZIRbGd+1ueVv84wcNKMJIJ7h3hPPVY3DVczOKzYDNeXwSRdvBWdfzJnllRVU2r Lmri8+yhZIL3DVGoWZSg==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDR0T-002CDQ-Tp; Fri, 28 Jan 2022 13:09:38 +0000 Received: from ams.source.kernel.org ([2604:1380:4601:e00::1]) by bombadil.infradead.org with esmtps (Exim 4.94.2 #2 (Red Hat Linux)) id 1nDQhx-00258G-OF for linux-arm-kernel@lists.infradead.org; Fri, 28 Jan 2022 12:50:31 +0000 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 ams.source.kernel.org (Postfix) with ESMTPS id 2C73DB8258E; Fri, 28 Jan 2022 12:50:28 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D94CDC340E0; Fri, 28 Jan 2022 12:50:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1643374227; bh=qpjVRaVEWFzPPfFR1CDCVPztUfAwB1ohZxpjzyW91rY=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=IvzJunJojOxw90LP2PgnRiOQxZ8tdKfxA6AFHfoVAlRwm3BmivPLCF0EV9zUg3kcs Mr31OAb/ADoYM8vUGU51UVQmEWKvM384I9UehBLDSY+ZRdofvWfaorB32CUivTfrSt Ton/gJfiCRtotgCeuVZCSQWRfrLU7Y9+yZcmqO+REyrYXDUrn0sKHv+jOJLDxOUXVW LmOLwKBP5C9z7rlwvU+ZdW2XdyxR0782JC1QP8KP77DFvCSqCG1wW/35FwAnHfU9VE oN2CycRnCuJ+P3pdXFnXEHpIUAmDm/z85OEMc5xRN4uSsO8bmyXN011iQAEiwChjzz 6mWRtUoaOkEjg== 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 1nDQEM-003njR-9s; Fri, 28 Jan 2022 12:19:54 +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 , Chase Conklin , "Russell King (Oracle)" , James Morse , Suzuki K Poulose , Alexandru Elisei , karl.heubaum@oracle.com, mihai.carabas@oracle.com, miguel.luis@oracle.com, kernel-team@android.com Subject: [PATCH v6 39/64] KVM: arm64: nv: Set a handler for the system instruction traps Date: Fri, 28 Jan 2022 12:18:47 +0000 Message-Id: <20220128121912.509006-40-maz@kernel.org> X-Mailer: git-send-email 2.30.2 In-Reply-To: <20220128121912.509006-1-maz@kernel.org> References: <20220128121912.509006-1-maz@kernel.org> MIME-Version: 1.0 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, chase.conklin@arm.com, linux@armlinux.org.uk, james.morse@arm.com, suzuki.poulose@arm.com, alexandru.elisei@arm.com, karl.heubaum@oracle.com, mihai.carabas@oracle.com, miguel.luis@oracle.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 X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20220128_045030_153230_56CCF0F0 X-CRM114-Status: GOOD ( 22.18 ) 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 From: Jintack Lim When HCR.NV bit is set, execution of the EL2 translation regime address aranslation instructions and TLB maintenance instructions are trapped to EL2. In addition, execution of the EL1 translation regime address aranslation instructions and TLB maintenance instructions that are only accessible from EL2 and above are trapped to EL2. In these cases, ESR_EL2.EC will be set to 0x18. Rework the system instruction emulation framework to handle potentially all system instruction traps other than MSR/MRS instructions. Those system instructions would be AT and TLBI instructions controlled by HCR_EL2.NV, AT, and TTLB bits. Signed-off-by: Jintack Lim [maz: squashed two patches together, redispatched various bits around] Signed-off-by: Marc Zyngier --- arch/arm64/include/asm/kvm_host.h | 4 +-- arch/arm64/kvm/handle_exit.c | 2 +- arch/arm64/kvm/sys_regs.c | 48 +++++++++++++++++++++++++------ 3 files changed, 42 insertions(+), 12 deletions(-) diff --git a/arch/arm64/include/asm/kvm_host.h b/arch/arm64/include/asm/kvm_host.h index a15183d0e1bf..0b887364f994 100644 --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -407,7 +407,7 @@ struct kvm_vcpu_arch { /* * Guest registers we preserve during guest debugging. * - * These shadow registers are updated by the kvm_handle_sys_reg + * These shadow registers are updated by the kvm_handle_sys * trap handler if the guest accesses or updates them while we * are using guest debug. */ @@ -724,7 +724,7 @@ int kvm_handle_cp14_32(struct kvm_vcpu *vcpu); int kvm_handle_cp14_64(struct kvm_vcpu *vcpu); int kvm_handle_cp15_32(struct kvm_vcpu *vcpu); int kvm_handle_cp15_64(struct kvm_vcpu *vcpu); -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu); +int kvm_handle_sys(struct kvm_vcpu *vcpu); void kvm_reset_sys_regs(struct kvm_vcpu *vcpu); diff --git a/arch/arm64/kvm/handle_exit.c b/arch/arm64/kvm/handle_exit.c index 867de65eb766..d135fc7e6883 100644 --- a/arch/arm64/kvm/handle_exit.c +++ b/arch/arm64/kvm/handle_exit.c @@ -236,7 +236,7 @@ static exit_handle_fn arm_exit_handlers[] = { [ESR_ELx_EC_SMC32] = handle_smc, [ESR_ELx_EC_HVC64] = handle_hvc, [ESR_ELx_EC_SMC64] = handle_smc, - [ESR_ELx_EC_SYS64] = kvm_handle_sys_reg, + [ESR_ELx_EC_SYS64] = kvm_handle_sys, [ESR_ELx_EC_SVE] = handle_sve, [ESR_ELx_EC_ERET] = kvm_handle_eret, [ESR_ELx_EC_IABT_LOW] = kvm_handle_guest_abort, diff --git a/arch/arm64/kvm/sys_regs.c b/arch/arm64/kvm/sys_regs.c index 5e8876177ce6..f669618f966b 100644 --- a/arch/arm64/kvm/sys_regs.c +++ b/arch/arm64/kvm/sys_regs.c @@ -1771,10 +1771,6 @@ static bool access_spsr_el2(struct kvm_vcpu *vcpu, * more demanding guest... */ static const struct sys_reg_desc sys_reg_descs[] = { - { SYS_DESC(SYS_DC_ISW), access_dcsw }, - { SYS_DESC(SYS_DC_CSW), access_dcsw }, - { SYS_DESC(SYS_DC_CISW), access_dcsw }, - DBG_BCR_BVR_WCR_WVR_EL1(0), DBG_BCR_BVR_WCR_WVR_EL1(1), { SYS_DESC(SYS_MDCCINT_EL1), trap_debug_regs, reset_val, MDCCINT_EL1, 0 }, @@ -2240,6 +2236,14 @@ static const struct sys_reg_desc sys_reg_descs[] = { EL2_REG(SP_EL2, NULL, reset_unknown, 0), }; +#define SYS_INSN_TO_DESC(insn, access_fn, forward_fn) \ + { SYS_DESC((insn)), (access_fn), NULL, 0, 0, NULL, NULL, (forward_fn) } +static struct sys_reg_desc sys_insn_descs[] = { + { SYS_DESC(SYS_DC_ISW), access_dcsw }, + { SYS_DESC(SYS_DC_CSW), access_dcsw }, + { SYS_DESC(SYS_DC_CISW), access_dcsw }, +}; + static bool trap_dbgdidr(struct kvm_vcpu *vcpu, struct sys_reg_params *p, const struct sys_reg_desc *r) @@ -2786,6 +2790,24 @@ static int emulate_sys_reg(struct kvm_vcpu *vcpu, return 1; } +static int emulate_sys_instr(struct kvm_vcpu *vcpu, struct sys_reg_params *p) +{ + const struct sys_reg_desc *r; + + /* Search from the system instruction table. */ + r = find_reg(p, sys_insn_descs, ARRAY_SIZE(sys_insn_descs)); + + if (likely(r)) { + perform_access(vcpu, p, r); + } else { + kvm_err("Unsupported guest sys instruction at: %lx\n", + *vcpu_pc(vcpu)); + print_sys_reg_instr(p); + kvm_inject_undefined(vcpu); + } + return 1; +} + /** * kvm_reset_sys_regs - sets system registers to reset value * @vcpu: The VCPU pointer @@ -2803,10 +2825,11 @@ void kvm_reset_sys_regs(struct kvm_vcpu *vcpu) } /** - * kvm_handle_sys_reg -- handles a mrs/msr trap on a guest sys_reg access + * kvm_handle_sys-- handles a system instruction or mrs/msr instruction trap + on a guest execution * @vcpu: The VCPU pointer */ -int kvm_handle_sys_reg(struct kvm_vcpu *vcpu) +int kvm_handle_sys(struct kvm_vcpu *vcpu) { struct sys_reg_params params; unsigned long esr = kvm_vcpu_get_esr(vcpu); @@ -2818,10 +2841,16 @@ int kvm_handle_sys_reg(struct kvm_vcpu *vcpu) params = esr_sys64_to_params(esr); params.regval = vcpu_get_reg(vcpu, Rt); - ret = emulate_sys_reg(vcpu, ¶ms); + if (params.Op0 == 1) { + /* System instructions */ + ret = emulate_sys_instr(vcpu, ¶ms); + } else { + /* MRS/MSR instructions */ + ret = emulate_sys_reg(vcpu, ¶ms); + if (!params.is_write) + vcpu_set_reg(vcpu, Rt, params.regval); + } - if (!params.is_write) - vcpu_set_reg(vcpu, Rt, params.regval); return ret; } @@ -3237,6 +3266,7 @@ void kvm_sys_reg_table_init(void) BUG_ON(check_sysreg_table(cp15_regs, ARRAY_SIZE(cp15_regs), true)); BUG_ON(check_sysreg_table(cp15_64_regs, ARRAY_SIZE(cp15_64_regs), true)); BUG_ON(check_sysreg_table(invariant_sys_regs, ARRAY_SIZE(invariant_sys_regs), false)); + BUG_ON(check_sysreg_table(sys_insn_descs, ARRAY_SIZE(sys_insn_descs), false)); /* We abuse the reset function to overwrite the table itself. */ for (i = 0; i < ARRAY_SIZE(invariant_sys_regs); i++) -- 2.30.2 _______________________________________________ linux-arm-kernel mailing list linux-arm-kernel@lists.infradead.org http://lists.infradead.org/mailman/listinfo/linux-arm-kernel