From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.remote-ip=100.103.45.18 ARC-Seal: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; cv=none; t=1792774644; b=Df3uSToDQR3GYGjW5JSt7YVDDnyod16pm3KxzCUVZVir3+S01IZJj/UrAbAIHndheTVK H4p8GHs8+mXbGkaCY4318Aa6EZGizIVUlu81XjD1E2cDeVsvdVoyeA8Vfs5fDbVijFx7S aWjQRpMUYQ/JQMHLbSCI21X8xy/2icZRxsKgpaq1UHtJp3I1vQZnCzHHaHEodBcuL/HUS n8gn5/BBs2ksndyfLNMzT7rFvWEzD6ZV3gd5dnllMtFLqbTcMEo/lymf4Hkk21XLSmDx4 dHjvMnXjLTDkaTj9LtDAKCtGsm+Cg6NKqjJBS/l4xtYCZZkkKKm76hK2T57qlvvUFQg== ARC-Message-Signature: i=1; d=subspace.kernel.org; s=arc20261015; a=rsa-sha256; c=relaxed/relaxed; t=1792774644; h=Received:DKIM-Signature:From:To:Cc:Subject:Date:Message-ID:X-Mailer: In-Reply-To:References:User-Agent:X-stable:X-Patchwork-Hint: MIME-Version:Content-Transfer-Encoding; bh=2ddEKx4FghHZinrwnxb2jvPyey7LUowZFkzpDRa38ak=; b=17YcvlVf5U1kgaxfGh2Tk/yxOdf8kxETdck8q15SyTA9CNqgi5KijUxjYXDe5hGW1+P7 6lzQmNT68B9hQqlvAWZs95eRTtq0iDnpXFMyxS7D8v5qfsHyGoGjAGJNr+D+uT/nogSVy iznpaqt6uxlke61B6NFyxwQ5P6FpTmiSicvCJ25pl3cfaDLJfeqixASF+wf3RhtKKvPnE OpUeW9hPoZd1CXEkYEEBh6ThLv9pz3IoyJfbHV1OeOIqUMUQgf+CQrVPS7UoSLJyIxBBq 7sRBfI4Z5Xflz3YwFLQKhCRZLqIQycglC36Uzh7el8B2FGyyFCtpfd/XJKxHScWEqWA== ARC-Authentication-Results: i=1; smtp.subspace.kernel.org; dkim=pass header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=0cYQ2KzU; arc=none smtp.remote-ip=100.103.45.18 Received: from smtp.kernel.org (quasi.space.kernel.org [100.103.45.18]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1)) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 74F0A606A31B; Fri, 23 Oct 2026 16:57:24 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key, unprotected) header.d=linuxfoundation.org header.i=@linuxfoundation.org header.a=rsa-sha256 header.s=korg header.b=0cYQ2KzU Received: by smtp.kernel.org (Postfix) with ESMTPSA id B94DF1F01825; Fri, 23 Oct 2026 16:57:23 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linuxfoundation.org; s=korg; t=1792774644; bh=2ddEKx4FghHZinrwnxb2jvPyey7LUowZFkzpDRa38ak=; h=From:To:Cc:Subject:Date:In-Reply-To:References; b=0cYQ2KzU4t/TRKbWUloqEndc1zuFMT+HWEOK179zt/ZDgJP4LFDkp7pvdQnE1wagK Jnt6EMsr0HQMEKyUaiZUcUIWPs3Bg5dcDvJpUpy/G05mluCl912AIOf4aK1YFRnr3Y hYpHu8flEfVxslgxemcQsi06c3H5B/YAgfhqxCFw= From: Greg Kroah-Hartman To: stable@vger.kernel.org Cc: Greg Kroah-Hartman , patches@lists.linux.dev, Jann Horn , Sean Christopherson Subject: [PATCH 7.2 110/242] KVM: SEV: Fix page dirtying in sev_gmem_post_populate() Date: Fri, 23 Oct 2026 18:39:12 +0200 Message-ID: <20261023163716.382198168@linuxfoundation.org> X-Mailer: git-send-email 2.56.0 In-Reply-To: <20261023163713.816071858@linuxfoundation.org> References: <20261023163713.816071858@linuxfoundation.org> User-Agent: quilt/0.69 X-stable: review X-Patchwork-Hint: ignore X-Mailing-List: patches@lists.linux.dev List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 Content-Transfer-Encoding: 8bit 7.2-stable review patch. If anyone has any objections, please let me know. ------------------ From: Jann Horn commit 97818b2fa7082e940ddd36dab12a68615300e798 upstream. set_page_dirty() requires that the caller holds some kind of lock to ensure that the page's mapping does not concurrently go away. That is not the case for a random page we got from get_user_pages_fast(), so use set_page_dirty_lock(). Fixes: 97cd21d57e9b ("KVM: SEV: Mark source page dirty when writing back CPUID data on failure") Cc: stable@vger.kernel.org Signed-off-by: Jann Horn Link: https://patch.msgid.link/20260810-x86-kvm-setpagedirty-v1-1-85f180892d4f@google.com [sean: tag for stable] Signed-off-by: Sean Christopherson Signed-off-by: Greg Kroah-Hartman --- arch/x86/kvm/svm/sev.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) --- a/arch/x86/kvm/svm/sev.c +++ b/arch/x86/kvm/svm/sev.c @@ -2431,7 +2431,7 @@ static int sev_gmem_post_populate(struct void *dst_vaddr = kmap_local_pfn(pfn); memcpy(src_vaddr, dst_vaddr, PAGE_SIZE); - set_page_dirty(src_page); + set_page_dirty_lock(src_page); kunmap_local(dst_vaddr); kunmap_local(src_vaddr);