From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-1.web.codeaurora.org [10.30.226.201]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 2378A1F92E for ; Fri, 14 Mar 2025 23:10:06 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=10.30.226.201 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741993807; cv=none; b=sQZfqO+pUfAFW2+5ta8SqqJV/ad28dqxBaSrWv0jBHhlLyS2xl8ijhT4qQgPaR50IB9f8nSR5JsIcWauK7zJmrAhBvaHM7Z3LNstvyDfUhQqSacoFOumhdXv/RHVeCJPhIDV7ahiLrIK6/byXy8cjLrpHhfa5yvTiuK2qsjgqC4= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741993807; c=relaxed/simple; bh=KbZFJSQTt+ShGS5hLc9Ed0i7kOGQy4qL8Xd5B7EF+4I=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=h5PqNuhbfFsChsZpa063XNmV8oIAHIh4ZyMc4Nw6FyD2MdfOMmukPKJ4GAf4/2FtBZhN9j3k3a0t7W/Ibp5FFoaOeDBybjQ5EPE1aYGaenvHPNNjyWV6UQDwLQritfRzkhSD8YS7S/jXZeQAaEgS9qgZl9U/CmjS5Pr8XqqnzGc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=O3MaZUhl; arc=none smtp.client-ip=10.30.226.201 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b="O3MaZUhl" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 2D992C4CEE3; Fri, 14 Mar 2025 23:10:06 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741993806; bh=KbZFJSQTt+ShGS5hLc9Ed0i7kOGQy4qL8Xd5B7EF+4I=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=O3MaZUhl0kh/OlK3Sgw+tIKSX5gdn4l3KRC84cmfXfhvlGJypK9RZvby2/+1WYozL PmlN1gokZy5+68fvctZXKE6hQ2tGGWCyxGDc1yM/vtrvkDHUpTLPgEBXd8+56N6bUs HSzV+EGECMSR+Yokr5kz4EfUXPiyShCe3Rx1d8E0a7ipNsv/+qhOeqamMxd3LyC9On chbJUSzz5iThHHUX+EDDKKBBIhjfobpxFAllZwM3UQGd7El1phfDVooxOOdKp1jwoo dL8Zs09tZLPZfcxw6l+Rz8lSB4BxSuVQBluqYAGEsua/aUzGz12fW28BDPbf0LAEyX C08q5qpiPmXfw== From: Sasha Levin To: stable@vger.kernel.org Cc: Mark Brown , Sasha Levin Subject: Re: [PATCH 6.12 4/8] KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN Date: Fri, 14 Mar 2025 19:10:04 -0400 Message-Id: <20250314084956-83dd7b2dcc1ef85a@stable.kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250314-stable-sve-6-12-v1-4-ddc16609d9ba@kernel.org> References: Precedence: bulk X-Mailing-List: stable@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit [ Sasha's backport helper bot ] Hi, ✅ All tests passed successfully. No issues detected. No action required from the submitter. The upstream commit SHA1 provided is correct: 459f059be702056d91537b99a129994aa6ccdd35 WARNING: Author mismatch between patch and upstream commit: Backport author: Mark Brown Commit author: Mark Rutland Status in newer kernel trees: 6.13.y | Present (different SHA1: 077e90a84fd7) Note: The patch differs from the upstream commit: --- 1: 459f059be7020 ! 1: 17b83bb28de29 KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN @@ Metadata ## Commit message ## KVM: arm64: Remove VHE host restore of CPACR_EL1.ZEN + [ Upstream commit 459f059be702056d91537b99a129994aa6ccdd35 ] + When KVM is in VHE mode, the host kernel tries to save and restore the configuration of CPACR_EL1.ZEN (i.e. CPTR_EL2.ZEN when HCR_EL2.E2H=1) across kvm_arch_vcpu_load_fp() and kvm_arch_vcpu_put_fp(), since the @@ Commit message Reviewed-by: Oliver Upton Link: https://lore.kernel.org/r/20250210195226.1215254-4-mark.rutland@arm.com Signed-off-by: Marc Zyngier + [Rework for refactoring of where the flags are stored -- broonie] + Signed-off-by: Mark Brown ## arch/arm64/include/asm/kvm_host.h ## -@@ arch/arm64/include/asm/kvm_host.h: struct cpu_sve_state { - struct kvm_host_data { - #define KVM_HOST_DATA_FLAG_HAS_SPE 0 - #define KVM_HOST_DATA_FLAG_HAS_TRBE 1 --#define KVM_HOST_DATA_FLAG_HOST_SVE_ENABLED 2 - #define KVM_HOST_DATA_FLAG_HOST_SME_ENABLED 3 - #define KVM_HOST_DATA_FLAG_TRBE_ENABLED 4 - #define KVM_HOST_DATA_FLAG_EL1_TRACING_CONFIGURED 5 +@@ arch/arm64/include/asm/kvm_host.h: struct kvm_vcpu_arch { + /* Save TRBE context if active */ + #define DEBUG_STATE_SAVE_TRBE __vcpu_single_flag(iflags, BIT(6)) + +-/* SVE enabled for host EL0 */ +-#define HOST_SVE_ENABLED __vcpu_single_flag(sflags, BIT(0)) + /* SME enabled for EL0 */ + #define HOST_SME_ENABLED __vcpu_single_flag(sflags, BIT(1)) + /* Physical CPU not in supported_cpus */ ## arch/arm64/kvm/fpsimd.c ## @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) fpsimd_save_and_flush_cpu_state(); *host_data_ptr(fp_owner) = FP_STATE_FREE; -- host_data_clear_flag(HOST_SVE_ENABLED); +- vcpu_clear_flag(vcpu, HOST_SVE_ENABLED); - if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN) -- host_data_set_flag(HOST_SVE_ENABLED); +- vcpu_set_flag(vcpu, HOST_SVE_ENABLED); - if (system_supports_sme()) { - host_data_clear_flag(HOST_SME_ENABLED); + vcpu_clear_flag(vcpu, HOST_SME_ENABLED); if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN) @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) * when needed. @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_put_fp(struct kvm_vcpu *vcpu) - * for EL0. To avoid spurious traps, restore the trap state - * seen by kvm_arch_vcpu_load_fp(): - */ -- if (host_data_test_flag(HOST_SVE_ENABLED)) +- if (vcpu_get_flag(vcpu, HOST_SVE_ENABLED)) - sysreg_clear_set(CPACR_EL1, 0, CPACR_EL1_ZEN_EL0EN); - else - sysreg_clear_set(CPACR_EL1, CPACR_EL1_ZEN_EL0EN, 0); --- Results of testing on various branches: | Branch | Patch Apply | Build Test | |---------------------------|-------------|------------| | stable/linux-6.12.y | Success | Success |