From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from smtp.kernel.org (aws-us-west-2-korg-mail-alma10-1.taild15c8.ts.net [100.103.45.18]) (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 E750F4D7950; Fri, 9 Oct 2026 14:16:35 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=100.103.45.18 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791555402; cv=none; b=tzeaRSM6dnMwqjR+ltqTfbgod9uHuxr0X6gRdmpoij6a8mD3+o/um5Pk4PsmdBDOTzAvoZ0CV+tXepmRnW1gJi5va6tfkvzJTAsO947zS9yxmps58UxpmNoAlPB5GCX0guP1DU8M2Ewr31WhqGuXego9MfULR2r4rcKX8e8/dRY= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1791555402; c=relaxed/simple; bh=gme7OEIPdR8hOy6EyZGs7UGWMnCfKqrFIO9uticHDos=; h=From:To:Cc:Subject:Date:Message-ID:In-Reply-To:References: MIME-Version; b=CvtV+3w+UY2djpaqBlkpfFF+USpggImJ/azwRq5Lk0KQcL70atnVmzhuWg2QUGVFh/BkHwf4Vme33o0uuu+vptZurbQSBmOwVatqOvcIYfrMTEWEyxYzQMYcxWs+FqpVFHILYQQsvlLCHfGgI+gNZIudo7iC04OLh0e2c9wBJoc= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b=GGALkFqb; arc=none smtp.client-ip=100.103.45.18 Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.b="GGALkFqb" Received: by smtp.kernel.org (Postfix) with ESMTPSA id 4C4571F000FF; Fri, 9 Oct 2026 14:16:35 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1791555395; bh=5H/ISLgI5q11hZeWHBd0rH8JSHr1GxjFlcO/dVpYt6A=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=GGALkFqbuuc6QYsmTdgSFRVa6hTp4tCYg5hXB6CWhYrj8YDixU21fEQNGfjpJhFF/ zamVENHxbKysW9VZowOK9x3taDLj4lFdIA31IjtLevpmNvY/7kgF3HFzfOMrrMPE0C PUEHXH1zB/Qr/3hZ2z8O2HlwWVfx6J9z4zJma+JM= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Vitaly Kuznetsov , "Jason A. Donenfeld" Subject: [PATCH 6.18 043/403] virt: vmgenid: remap memory as decrypted Date: Fri, 9 Oct 2026 16:06:44 +0200 Message-ID: <20261009140953.112946920@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261009140952.119038291@linuxfoundation.org> References: <20261009140952.119038291@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore Precedence: bulk X-Mailing-List: patches@lists.linux.dev List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 6.18-stable review patch. If anyone has any objections, please let me know. ------------------ From: Vitaly Kuznetsov commit 1b48c13075829ee4961feeabd816dac1c9111959 upstream. It was found that AWS SEV-SNP enabled instances are not able to boot with commit 81256a50aa0f ("x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default") applied and the reason seems to be the vmgenid device which requires unencrypted writeable memory. A similar problem was previously fixed in DRM with commit 7dfede7d7edd ("drm/vmwgfx: Fix guests running with TDX/SEV"). Note, trusting vmgenid device in a Confidential VM is questionable: the malicious host may intentionally avoid notifying the guest when a copy is created. Fixes: 81256a50aa0f ("x86/mm: Make memremap(MEMREMAP_WB) map memory as encrypted by default") Signed-off-by: Vitaly Kuznetsov Cc: stable@vger.kernel.org # 6.15+ Signed-off-by: Jason A. Donenfeld Signed-off-by: Greg Kroah-Hartman --- drivers/virt/vmgenid.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) --- a/drivers/virt/vmgenid.c +++ b/drivers/virt/vmgenid.c @@ -75,7 +75,8 @@ static int vmgenid_add_acpi(struct devic phys_addr = (obj->package.elements[0].integer.value << 0) | (obj->package.elements[1].integer.value << 32); - virt_addr = devm_memremap(&device->dev, phys_addr, VMGENID_SIZE, MEMREMAP_WB); + virt_addr = devm_memremap(&device->dev, phys_addr, VMGENID_SIZE, + MEMREMAP_WB | MEMREMAP_DEC); if (IS_ERR(virt_addr)) { ret = PTR_ERR(virt_addr); goto out;