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 A94A01DFED for ; Thu, 13 Mar 2025 12:31:43 +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=1741869104; cv=none; b=LHO8PrSRsu7Pe5tojB9ShYVpedcjmkLXwVYLmDG9A+yPcCmYAqpfj5xiuUrZo13w0mrqsh/OH/nV1zc+zX8VOeghN+ngdjHd4UWE4bL5q4RKp0GAjVURKpAz7ghXdXazpd5i8w2MvOH0fKc9sKQOleWr2m8leJMsDci9mYJX84g= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1741869104; c=relaxed/simple; bh=uF1U6cx4cZNFjhWe0IQS0FNVEovFgWaChfAPS7eNUWA=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version:Content-Type; b=khuS0yxQ3Qqav0I4cXPLdLkhdm3b2LoivN/cSQckILSn93UbXMKube64BoliTOG1tVkY5J9bGRTb/ZqGZCDv7lExRkztSfInBhjpTVe2C3pyZxXYgCVmcT4w3QXhY4xnqLBU/YuaYrxJrFBMrTKX1IRtSBzUAAqBAJ2z5QjfKgQ= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.b=fOILSdsR; 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="fOILSdsR" Received: by smtp.kernel.org (Postfix) with ESMTPSA id C2E6DC4CEE5; Thu, 13 Mar 2025 12:31:42 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1741869103; bh=uF1U6cx4cZNFjhWe0IQS0FNVEovFgWaChfAPS7eNUWA=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=fOILSdsRTormAdpq8LBXdWhBfZW07JUgnPfTXn6Y9HzUHt2NlkYeVmzzA4xtaWICO VNyxwxfjw8AnkzQD5k5S9g/nlccsu8iGimpvJxq5J+CqrbcYSE4pPnMfR76L4nxAj3 5xiR29QsbgXVHkA3Q1eHOkslbjIRixcIgf12axa0deMoKwnL8HXQQusAWBREcQMdG9 s9u9SDJx9Su5f5XC3IXxi2z34+uLgGTNp9/ku9RRSx1O/eCqB7nQliGRsVzL2gHq6F 3Lqb4eBVbhTov1a/X7X65jdvZL9bUTDCw95A4+s2K4N209Ow7tlRm4PS3XLGjUNk8p 0Plldz/cXrMug== From: Sasha Levin To: stable@vger.kernel.org Cc: Mark Brown , Sasha Levin Subject: Re: [PATCH 6.13 2/8] KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state Date: Thu, 13 Mar 2025 08:31:41 -0400 Message-Id: <20250313054518-33853f58057cc3c5@stable.kernel.org> X-Mailer: git-send-email 2.39.5 In-Reply-To: <20250312-stable-sve-6-13-v1-2-c7ba07a6f4f7@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: fbc7e61195e23f744814e78524b73b59faa54ab4 WARNING: Author mismatch between patch and upstream commit: Backport author: Mark Brown Commit author: Mark Rutland Note: The patch differs from the upstream commit: --- 1: fbc7e61195e23 ! 1: e5f1987c70b10 KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state @@ Metadata ## Commit message ## KVM: arm64: Unconditionally save+flush host FPSIMD/SVE/SME state + [ Upstream commit fbc7e61195e23f744814e78524b73b59faa54ab4 ] + There are several problems with the way hyp code lazily saves the host's FPSIMD/SVE state, including: @@ Commit message Reviewed-by: Oliver Upton Link: https://lore.kernel.org/r/20250210195226.1215254-2-mark.rutland@arm.com Signed-off-by: Marc Zyngier + [ Mark: Handle vcpu/host flag conflict ] + Signed-off-by: Mark Rutland + Signed-off-by: Mark Brown ## arch/arm64/kernel/fpsimd.c ## @@ arch/arm64/kernel/fpsimd.c: void fpsimd_signal_preserve_current_state(void) @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) + *host_data_ptr(fpsimd_state) = NULL; + *host_data_ptr(fpmr_ptr) = NULL; - host_data_clear_flag(HOST_SVE_ENABLED); + vcpu_clear_flag(vcpu, HOST_SVE_ENABLED); if (read_sysreg(cpacr_el1) & CPACR_EL1_ZEN_EL0EN) @@ arch/arm64/kvm/fpsimd.c: void kvm_arch_vcpu_load_fp(struct kvm_vcpu *vcpu) - host_data_clear_flag(HOST_SME_ENABLED); + vcpu_clear_flag(vcpu, HOST_SME_ENABLED); if (read_sysreg(cpacr_el1) & CPACR_EL1_SMEN_EL0EN) - host_data_set_flag(HOST_SME_ENABLED); + vcpu_set_flag(vcpu, HOST_SME_ENABLED); - - /* - * If PSTATE.SM is enabled then save any pending FP --- Results of testing on various branches: | Branch | Patch Apply | Build Test | |---------------------------|-------------|------------| | stable/linux-6.13.y | Success | Success |