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 3E9D4C369C2 for ; Tue, 22 Apr 2025 07:23:21 +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=SXUmrlZMtZ2amkCJZGD1xL6Fwm5VShTa9XFroeSXrcw=; b=KqNZhyMyHOiu8+HXwffQVmSLVi bJ+BTW5Fq4wChqZIx58nZ2WyBZ3wGaazh7P66QnvsGiQ2JMLqjoO9opuoM7mwL1cB3UPYmGs3IzYi LRMSk+ktg57IF34fX8OvwcdYmzIj1N1qS2E46i3x4a/HaX8pDpLZZfj3SEJPvppv6Pfm269nBEiiz xaDY0txVkQKXYd2EITDHug9kP01/q5frhuEtCnZ40OBGnRc0dBcRmnF8IPx5YTKSyzFeLzVXYgQPr 0A7qU7Kf/tYjR7+US7m1Q1dSOgimPE1IpCvln6JN9HTRtjUSkytAJB+Akevm3NSKpQrT5VzlIMVnM UFSG00sQ==; Received: from localhost ([::1] helo=bombadil.infradead.org) by bombadil.infradead.org with esmtp (Exim 4.98.2 #2 (Red Hat Linux)) id 1u77yI-000000066N9-2L0q; Tue, 22 Apr 2025 07:23:10 +0000 Received: from dfw.source.kernel.org ([2604:1380:4641:c500::1]) by bombadil.infradead.org with esmtps (Exim 4.98.2 #2 (Red Hat Linux)) id 1u77O1-000000061Vb-1ESf for linux-arm-kernel@lists.infradead.org; Tue, 22 Apr 2025 06:45:42 +0000 Received: from smtp.kernel.org (transwarp.subspace.kernel.org [100.75.92.58]) by dfw.source.kernel.org (Postfix) with ESMTP id 6B32A5C59C5; Tue, 22 Apr 2025 06:43:23 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id D5F72C4CEE9; Tue, 22 Apr 2025 06:45:39 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=linuxfoundation.org; s=korg; t=1745304340; bh=IelFZyqhnsZfH+nfLfqq2Dnn1AvLKiyy5Z1+g72g8ic=; h=Subject:To:Cc:From:Date:In-Reply-To:From; b=CIVQxLMOKyaz02zhzLW8SWe14WTia5KAKTjTW3zwUoKAVZIshPU2fVujnEhOkPBr7 GMAl3Y7AHGBgXLOteghgspY1GMDsJTcqNN+M7/+Z1oq8JwmLPYfbu8AFZjd3jbywf2 YOXizqDrEpR1Lzw1Q/IeLwG1WWUG3VnYmQqNyZhI= Subject: Patch "KVM: arm64: Remove host FPSIMD saving for non-protected KVM" has been added to the 5.15-stable tree To: broonie@kernel.org,catalin.marinas@arm.com,gregkh@linuxfoundation.org,james.morse@arm.com,kvmarm@lists.cs.columbia.edu,linux-arm-kernel@lists.infradead.org,mark.rutland@arm.com,maz@kernel.org,oleg@redhat.com,oliver.upton@linux.dev,suzuki.poulose@arm.com,tabba@google.com,will@kernel.org Cc: From: Date: Tue, 22 Apr 2025 08:45:14 +0200 In-Reply-To: <20250408-stable-sve-5-15-v3-8-ca9a6b850f55@kernel.org> Message-ID: <2025042214-contend-fineness-2457@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-20250421_234541_451371_AE76D1F8 X-CRM114-Status: GOOD ( 18.99 ) 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: Remove host FPSIMD saving for non-protected KVM to the 5.15-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-remove-host-fpsimd-saving-for-non-protected-kvm.patch and it can be found in the queue-5.15 subdirectory. If you, or anyone else, feels it should not be added to the stable tree, please let know about it. >From broonie@kernel.org Tue Apr 8 20:22:43 2025 From: Mark Brown Date: Tue, 08 Apr 2025 19:10:03 +0100 Subject: KVM: arm64: Remove host FPSIMD saving for non-protected KVM To: Greg Kroah-Hartman , Marc Zyngier , James Morse , Suzuki K Poulose , Catalin Marinas , Will Deacon , Oleg Nesterov , Oliver Upton Cc: linux-arm-kernel@lists.infradead.org, kvmarm@lists.cs.columbia.edu, linux-kernel@vger.kernel.org, stable@vger.kernel.org, Mark Brown , Mark Rutland , Fuad Tabba Message-ID: <20250408-stable-sve-5-15-v3-8-ca9a6b850f55@kernel.org> From: Mark Rutland [ Upstream commit 8eca7f6d5100b6997df4f532090bc3f7e0203bef ] Now that the host eagerly saves its own FPSIMD/SVE/SME state, non-protected KVM never needs to save the host FPSIMD/SVE/SME state, and the code to do this is never used. Protected KVM still needs to save/restore the host FPSIMD/SVE state to avoid leaking guest state to the host (and to avoid revealing to the host whether the guest used FPSIMD/SVE/SME), and that code needs to be retained. Remove the unused code and data structures. To avoid the need for a stub copy of kvm_hyp_save_fpsimd_host() in the VHE hyp code, the nVHE/hVHE version is moved into the shared switch header, where it is only invoked when KVM is in protected mode. Signed-off-by: Mark Rutland Reviewed-by: Mark Brown Tested-by: Mark Brown Acked-by: Will Deacon Cc: Catalin Marinas Cc: Fuad Tabba Cc: Marc Zyngier Cc: Oliver Upton Reviewed-by: Oliver Upton Link: https://lore.kernel.org/r/20250210195226.1215254-3-mark.rutland@arm.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/fpsimd.c | 1 - arch/arm64/kvm/hyp/include/hyp/switch.h | 6 +----- 3 files changed, 1 insertion(+), 7 deletions(-) --- a/arch/arm64/include/asm/kvm_host.h +++ b/arch/arm64/include/asm/kvm_host.h @@ -333,7 +333,6 @@ struct kvm_vcpu_arch { struct kvm_guest_debug_arch external_debug_state; struct thread_info *host_thread_info; /* hyp VA */ - struct user_fpsimd_state *host_fpsimd_state; /* hyp VA */ struct { /* {Break,watch}point registers */ --- a/arch/arm64/kvm/fpsimd.c +++ b/arch/arm64/kvm/fpsimd.c @@ -55,7 +55,6 @@ int kvm_arch_vcpu_run_map_fp(struct kvm_ } vcpu->arch.host_thread_info = kern_hyp_va(ti); - vcpu->arch.host_fpsimd_state = kern_hyp_va(fpsimd); error: return ret; } --- a/arch/arm64/kvm/hyp/include/hyp/switch.h +++ b/arch/arm64/kvm/hyp/include/hyp/switch.h @@ -251,11 +251,7 @@ static inline bool __hyp_handle_fpsimd(s } isb(); - if (vcpu->arch.flags & KVM_ARM64_FP_HOST) { - __fpsimd_save_state(vcpu->arch.host_fpsimd_state); - vcpu->arch.flags &= ~KVM_ARM64_FP_HOST; - } - + /* Restore the guest state */ if (sve_guest) __hyp_sve_restore_guest(vcpu); else Patches currently in stable-queue which might be from broonie@kernel.org are queue-5.15/kvm-arm64-remove-host-fpsimd-saving-for-non-protected-kvm.patch queue-5.15/spi-cadence-qspi-fix-probe-on-am62a-lp-sk.patch queue-5.15/asoc-qdsp6-q6asm-dai-fix-q6asm_dai_compr_set_params-error-path.patch queue-5.15/kvm-arm64-eagerly-switch-zcr_el-1-2.patch queue-5.15/kvm-arm64-unconditionally-save-flush-host-fpsimd-sve-sme-state.patch queue-5.15/kvm-arm64-always-start-with-clearing-sve-flag-on-load.patch queue-5.15/asoc-codecs-lpass-wsa-macro-fix-vi-feedback-rate.patch queue-5.15/arm64-fpsimd-track-the-saved-fpsimd-state-type-separately-to-tif_sve.patch queue-5.15/kvm-arm64-get-rid-of-host-sve-tracking-saving.patch queue-5.15/kvm-arm64-remove-vhe-host-restore-of-cpacr_el1.zen.patch queue-5.15/asoc-fsl_audmix-register-card-device-depends-on-dais.patch queue-5.15/arm64-fpsimd-have-kvm-explicitly-say-which-fp-registers-to-save.patch queue-5.15/kvm-arm64-discard-any-sve-state-when-entering-kvm-guests.patch queue-5.15/arm64-fpsimd-stop-using-tif_sve-to-manage-register-saving-in-kvm.patch queue-5.15/asoc-codecs-lpass-wsa-macro-fix-logic-of-enabling-vi-channels.patch queue-5.15/kvm-arm64-calculate-cptr_el2-traps-on-activating-traps.patch