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 DE022C36002 for ; Mon, 24 Mar 2025 19:30:28 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender:List-Subscribe:List-Help :List-Post:List-Archive:List-Unsubscribe:List-Id:Content-Transfer-Encoding: Content-Type:MIME-Version:Message-ID:In-Reply-To:Date:From:Cc:To:Subject: Reply-To:Content-ID:Content-Description:Resent-Date:Resent-From:Resent-Sender :Resent-To:Resent-Cc:Resent-Message-ID:References:List-Owner; bh=nJksNlFi8ncldkxscZW+HQ5o9xCsfSheB24duBQ3tJw=; b=sCURaZq3RjK5D9O1JQvfXgJlkg 96TIl1g6eCIfAsSamDucIVBTa7i5t6Jgh/JhUgJEIv7QsfFfYobwHld+DxWrkwn37Z6Xf8jseKCFE nX5GRcnheE1vMAU19tognqnYuDBdcailcwh8mvH/Niu0VrQuGYucqHhscjFkD+1iPB5Eue28LIg8J KtchLBVx8hFdXU0eTGg/1nt9YufEpHixXHaaF8v9bJdYsj6nnm2i8yp3GWlWsIAT5H2SU5Jd3iueR zhfUMvyPJVajAuvJ8CVXWE58OJbtpHdsKVSrUavDP+3kg+BjJRdDbaD1Rx6ur8OMIhRMLQjrph8+d 09uBx9NQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98 #2 (Red Hat Linux)) id 1twnV3-000000044we-2efT; Mon, 24 Mar 2025 19:30:17 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98 #2 (Red Hat Linux)) id 1twn2C-000000040US-1ySK for linux-arm-kernel@lists.infradead.org; Mon, 24 Mar 2025 19:00:30 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id BA9325C3086; Mon, 24 Mar 2025 18:58:10 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 43D4BC4CEE4; Mon, 24 Mar 2025 19:00:27 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1742842827; bh=WoZjQQTPKi3wZ4qIPPtrs76TEmIfCC4wPBJt3zp3zwY=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=oVz4OUfCPDxZ+tA0/8Y0i8WnqFCwd9VvX+RnrMMFtFMLhoOZ+xT4brjILV6bKkvza x685D0ZubdClMGt9o59B7KulJen72lufkpN/B20zaV0bKEVPSAWyckuJWyQ0Vgo9fN H1rYRqbX5KvlhFXHYH/yXORVfpwQsBKkjFQNapaQ= Subject: Patch "KVM: arm64: Calculate cptr_el2 traps on activating traps" has been added to the 6.12-stable tree To: broonie@kernel.org,catalin.marinas@arm.com,gregkh@linuxfoundation.org,james.clark@linaro.org,joey.gouly@arm.com,kvmarm@lists.linux.dev,linux-arm-kernel@lists.infradead.org,maz@kernel.org,oliver.upton@linux.dev,suzuki.poulose@arm.com,tabba@google.com,will@kernel.org Cc: From: Date: Mon, 24 Mar 2025 11:59:04 -0700 In-Reply-To: <20250321-stable-sve-6-12-v2-1-417ca2278d18@kernel.org> Message-ID: <2025032404-phrase-vending-4278@gregkh> MIME-Version: 1.0 Content-Type: text/plain; charset=ANSI_X3.4-1968 Content-Transfer-Encoding: 8bit X-stable: commit X-Patchwork-Hint: ignore X-CRM114-Version: 20100106-BlameMichelson ( TRE 0.8.0 (BSD) ) MR-646709E3 X-CRM114-CacheID: sfid-20250324_120028_633880_566BA5DC X-CRM114-Status: GOOD ( 20.34 ) 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 This is a note to let you know that I've just added the patch titled KVM: arm64: Calculate cptr_el2 traps on activating traps to the 6.12-stable tree which can be found at: http://www.kernel.org/git/?p=linux/kernel/git/stable/stable-queue.git;a=summary The filename of the patch is: kvm-arm64-calculate-cptr_el2-traps-on-activating-traps.patch and it can be found in the queue-6.12 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From stable+bounces-125707-greg=kroah.com@vger.kernel.org Thu Mar 20 17:14:12 2025 From: Mark Brown Date: Fri, 21 Mar 2025 00:12:57 +0000 Subject: KVM: arm64: Calculate cptr_el2 traps on activating traps To: Greg Kroah-Hartman , Marc Zyngier , Oliver Upton , Joey Gouly , Suzuki K Poulose , Catalin Marinas , Will Deacon Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.linux.dev, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Mark Brown , Fuad Tabba , James Clark Message-ID: <20250321-stable-sve-6-12-v2-1-417ca2278d18@kernel.org> From: Fuad Tabba [ Upstream commit 2fd5b4b0e7b440602455b79977bfa64dea101e6c ] Similar to VHE, calculate the value of cptr_el2 from scratch on activate traps. This removes the need to store cptr_el2 in every vcpu structure. Moreover, some traps, such as whether the guest owns the fp registers, need to be set on every vcpu run. Reported-by: James Clark Fixes: 5294afdbf45a ("KVM: arm64: Exclude FP ownership from kvm_vcpu_arch") Signed-off-by: Fuad Tabba Link: https://lore.kernel.org/r/20241216105057.579031-13-tabba@google.com Signed-off-by: Marc Zyngier Signed-off-by: Mark Brown Signed-off-by: Greg Kroah-Hartman --- arch/arm64/include/asm/kvm_host.h | 1 arch/arm64/kvm/arm.c | 1 arch/arm64/kvm/hyp/nvhe/pkvm.c | 29 --------------------- arch/arm64/kvm/hyp/nvhe/switch.c | 51 +++++++++++++++++++++++--------------- 4 files changed, 32 insertions(+), 50 deletions(-) --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -697,7 +697,6 @@ struct kvm_vcpu_arch { u64 hcr_el2; u64 hcrx_el2; u64 mdcr_el2; - u64 cptr_el2; /* Exception Information */ struct kvm_vcpu_fault_info fault; --- a/arch/arm64/kvm/arm.c +++ b/arch/arm64/kvm/arm.c @@ -1577,7 +1577,6 @@ static int kvm_arch_vcpu_ioctl_vcpu_init } vcpu_reset_hcr(vcpu); - vcpu->arch.cptr_el2 = kvm_get_reset_cptr_el2(vcpu); /* * Handle the "start in power-off" case. --- a/arch/arm64/kvm/hyp/nvhe/pkvm.c +++ b/arch/arm64/kvm/hyp/nvhe/pkvm.c @@ -28,8 +28,6 @@ static void pvm_init_traps_aa64pfr0(stru const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64PFR0_EL1); u64 hcr_set = HCR_RW; u64 hcr_clear = 0; - u64 cptr_set = 0; - u64 cptr_clear = 0; /* Protected KVM does not support AArch32 guests. */ BUILD_BUG_ON(FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_EL0), @@ -59,21 +57,10 @@ static void pvm_init_traps_aa64pfr0(stru /* Trap AMU */ if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_AMU), feature_ids)) { hcr_clear |= HCR_AMVOFFEN; - cptr_set |= CPTR_EL2_TAM; - } - - /* Trap SVE */ - if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64PFR0_EL1_SVE), feature_ids)) { - if (has_hvhe()) - cptr_clear |= CPACR_ELx_ZEN; - else - cptr_set |= CPTR_EL2_TZ; } vcpu->arch.hcr_el2 |= hcr_set; vcpu->arch.hcr_el2 &= ~hcr_clear; - vcpu->arch.cptr_el2 |= cptr_set; - vcpu->arch.cptr_el2 &= ~cptr_clear; } /* @@ -103,7 +90,6 @@ static void pvm_init_traps_aa64dfr0(stru const u64 feature_ids = pvm_read_id_reg(vcpu, SYS_ID_AA64DFR0_EL1); u64 mdcr_set = 0; u64 mdcr_clear = 0; - u64 cptr_set = 0; /* Trap/constrain PMU */ if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_PMUVer), feature_ids)) { @@ -130,21 +116,12 @@ static void pvm_init_traps_aa64dfr0(stru if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_TraceFilt), feature_ids)) mdcr_set |= MDCR_EL2_TTRF; - /* Trap Trace */ - if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_TraceVer), feature_ids)) { - if (has_hvhe()) - cptr_set |= CPACR_EL1_TTA; - else - cptr_set |= CPTR_EL2_TTA; - } - /* Trap External Trace */ if (!FIELD_GET(ARM64_FEATURE_MASK(ID_AA64DFR0_EL1_ExtTrcBuff), feature_ids)) mdcr_clear |= MDCR_EL2_E2TB_MASK << MDCR_EL2_E2TB_SHIFT; vcpu->arch.mdcr_el2 |= mdcr_set; vcpu->arch.mdcr_el2 &= ~mdcr_clear; - vcpu->arch.cptr_el2 |= cptr_set; } /* @@ -195,10 +172,6 @@ static void pvm_init_trap_regs(struct kv /* Clear res0 and set res1 bits to trap potential new features. */ vcpu->arch.hcr_el2 &= ~(HCR_RES0); vcpu->arch.mdcr_el2 &= ~(MDCR_EL2_RES0); - if (!has_hvhe()) { - vcpu->arch.cptr_el2 |= CPTR_NVHE_EL2_RES1; - vcpu->arch.cptr_el2 &= ~(CPTR_NVHE_EL2_RES0); - } } /* @@ -579,8 +552,6 @@ unlock: return ret; } - hyp_vcpu->vcpu.arch.cptr_el2 = kvm_get_reset_cptr_el2(&hyp_vcpu->vcpu); - return 0; } --- a/arch/arm64/kvm/hyp/nvhe/switch.c +++ b/arch/arm64/kvm/hyp/nvhe/switch.c @@ -36,33 +36,46 @@ DEFINE_PER_CPU(unsigned long, kvm_hyp_ve extern void kvm_nvhe_prepare_backtrace(unsigned long fp, unsigned long pc); -static void __activate_traps(struct kvm_vcpu *vcpu) +static void __activate_cptr_traps(struct kvm_vcpu *vcpu) { - u64 val; + u64 val = CPTR_EL2_TAM; /* Same bit irrespective of E2H */ - ___activate_traps(vcpu, vcpu->arch.hcr_el2); - __activate_traps_common(vcpu); + if (has_hvhe()) { + val |= CPACR_ELx_TTA; - val = vcpu->arch.cptr_el2; - val |= CPTR_EL2_TAM; /* Same bit irrespective of E2H */ - val |= has_hvhe() ? CPACR_EL1_TTA : CPTR_EL2_TTA; - if (cpus_have_final_cap(ARM64_SME)) { - if (has_hvhe()) - val &= ~CPACR_ELx_SMEN; - else - val |= CPTR_EL2_TSM; - } + if (guest_owns_fp_regs()) { + val |= CPACR_ELx_FPEN; + if (vcpu_has_sve(vcpu)) + val |= CPACR_ELx_ZEN; + } + } else { + val |= CPTR_EL2_TTA | CPTR_NVHE_EL2_RES1; + + /* + * Always trap SME since it's not supported in KVM. + * TSM is RES1 if SME isn't implemented. + */ + val |= CPTR_EL2_TSM; - if (!guest_owns_fp_regs()) { - if (has_hvhe()) - val &= ~(CPACR_ELx_FPEN | CPACR_ELx_ZEN); - else - val |= CPTR_EL2_TFP | CPTR_EL2_TZ; + if (!vcpu_has_sve(vcpu) || !guest_owns_fp_regs()) + val |= CPTR_EL2_TZ; - __activate_traps_fpsimd32(vcpu); + if (!guest_owns_fp_regs()) + val |= CPTR_EL2_TFP; } + if (!guest_owns_fp_regs()) + __activate_traps_fpsimd32(vcpu); + kvm_write_cptr_el2(val); +} + +static void __activate_traps(struct kvm_vcpu *vcpu) +{ + ___activate_traps(vcpu, vcpu->arch.hcr_el2); + __activate_traps_common(vcpu); + __activate_cptr_traps(vcpu); + write_sysreg(__this_cpu_read(kvm_hyp_vector), vbar_el2); if (cpus_have_final_cap(ARM64_WORKAROUND_SPECULATIVE_AT)) { Patches currently in stable-queue which might be from broonie@kernel.org are queue-6.12/kvm-arm64-calculate-cptr_el2-traps-on-activating-traps.patch queue-6.12/regulator-check-that-dummy-regulator-has-been-probed-before-using-it.patch queue-6.12/kvm-arm64-eagerly-switch-zcr_el-1-2.patch queue-6.12/kvm-arm64-mark-some-header-functions-as-inline.patch queue-6.12/kvm-arm64-remove-host-fpsimd-saving-for-non-protected-kvm.patch queue-6.12/regulator-dummy-force-synchronous-probing.patch queue-6.12/kvm-arm64-refactor-exit-handlers.patch queue-6.12/kvm-arm64-unconditionally-save-flush-host-fpsimd-sve-sme-state.patch queue-6.12/kvm-arm64-remove-vhe-host-restore-of-cpacr_el1.smen.patch queue-6.12/kvm-arm64-remove-vhe-host-restore-of-cpacr_el1.zen.patch