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smtp.subspace.kernel.org; dkim=pass header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=gcZYmCrb; 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 66299606A337; Fri, 13 Nov 2026 19:00:10 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=gcZYmCrb Received: by smtp.kernel.org (Postfix) with ESMTPSA id CB51F1F000C4; Fri, 13 Nov 2026 19:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794596410; bh=+2lqXoxbcTGbpqi5YkiRhwq1uO/E+YCynWayZ3OE3fk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=gcZYmCrb/XakcrNd58e3ddXkD36SjuOB0rbEEBXmvH785qkb9J2/KK9BHMjqhPOdD 7sQkDObyATbGUuhcqKqGrEXCUiXVpdyfzVyO9YQLKKG/6aTVob2pgTNO1IuNaj6/dG APTwnMbRMSLtHHT7Y4dXM8O0DsNemxBY2KlH3MRjlmE8oQzAEkzRLGJMWHIIkVtuWZ uYUZPIsbhVuPx6iD5A4ScPvtRe3uQlffpuhazLJ3BF7hTUDanfv7K1hsChy+q6Vdo7 dSv4aGisHzzgaPOOwGrgGIt7wf0it+6ZKnZlcXBv5vbzxzUPz4LxcfeF9nN+6E4uS/ 6x5mu1VMCiK/Q== Message-ID: <2ff19317-8da9-4014-be04-27fc218b8eea@kernel.org> Date: Fri, 13 Nov 2026 20:00:02 +0100 X-Mailing-List: linux-s390@vger.kernel.org List-Id: List-Post: List-Help: List-Subscribe: List-Unsubscribe: List-Owner: Precedence: list MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/9] KVM: don't zap secondary MMU on permission upgrade To: =?UTF-8?Q?Carlos_L=C3=B3pez?= , kvm@vger.kernel.org, linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org, seanjc@google.com, pbonzini@redhat.com, akpm@linux-foundation.org, peterx@redhat.com, ljs@kernel.org, imbrenda@linux.ibm.com, borntraeger@linux.ibm.com, frankja@linux.ibm.com, Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti References: <20261112142039.907090-2-clopez@suse.de> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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charset=UTF-8 Content-Transfer-Encoding: 8bit On 11/12/26 15:20, Carlos López wrote: > Stop KVM from zapping its mappings on permission upgrades on x86 and > s390, as these keep the PFNs unchanged and revoke no access. KVM faults > in the new permissions on demand, so dropping mappings early gains > nothing. > > To do so, add an MMU notifier flag that marks an > MMU_NOTIFY_PROTECTION_VMA invalidation as a strict permission upgrade. > For the flag to be accurate, change_protection() keeps writable entries > writable on such changes. A few cases where it needlessly makes or > leaves entries read-only are fixed along the way. > > Background > ========== > > change_protection() pairs every protection change with an > MMU_NOTIFY_PROTECTION_VMA invalidation, and KVM zaps its SPTEs in > response, as it cannot tell whether permissions widened or narrowed. > This is costly, e.g. during a QEMU background snapshot, which uses > uffd-wp to write-protect guest RAM and unprotects each page once it is > saved. Every unprotect then makes the guest refault memory it could > already access. > > Secondary MMUs that share the CPU page tables (e.g. ARM SMMU, > IOMMU/ATS) can keep read-only entries in their TLBs that a fault does > not flush, so they are already notified of permission upgrades on the > CPU TLB flush path [1]. KVM keeps its own page tables and faults in > permissions on demand, so it needs no notification, as Sean noted when > that signalling was first proposed [2]. > > Series overview > =============== > > Patches 1-4 fix cases where change_protection() needlessly makes or > leaves entries read-only, so that the next write to them faults. They > only affect performance and can be picked up independently. We generally don't add performance improvements without clear motivation and data to back it up. MM is currently busy with more important stuff, so best to keep your changes to a bare minimum. -- Cheers, David From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from bombadil.infradead.org (bombadil.infradead.org [198.137.202.133]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature ECDSA (prime256v1) server-digest SHA256) (No client certificate requested) by smtp.subspace.kernel.org (Postfix) with ESMTPS id 11710606B35E for ; Fri, 13 Nov 2026 19:00:42 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; dkim=pass (2048-bit key) header.d=lists.infradead.org header.i=@lists.infradead.org header.a=rsa-sha256 header.s=bombadil.20210309 header.b=wHr4xtHT; dkim=fail reason="signature verification failed" (2048-bit key) header.d=kernel.org header.i=@kernel.org header.a=rsa-sha256 header.s=k20260515 header.b=gcZYmCrb DKIM-Signature: v=1; a=rsa-sha256; q=dns/txt; c=relaxed/relaxed; d=lists.infradead.org; s=bombadil.20210309; h=Sender: Content-Transfer-Encoding:Content-Type:List-Subscribe:List-Help:List-Post: List-Archive:List-Unsubscribe:List-Id:In-Reply-To:From:References:Cc:To: Subject:MIME-Version:Date:Message-ID:Reply-To:Content-ID:Content-Description: Resent-Date:Resent-From:Resent-Sender:Resent-To:Resent-Cc:Resent-Message-ID: List-Unsubscribe-Post:List-Owner; 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Fri, 13 Nov 2026 19:00:04 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=kernel.org; s=k20260515; t=1794596410; bh=+2lqXoxbcTGbpqi5YkiRhwq1uO/E+YCynWayZ3OE3fk=; h=Date:Subject:To:Cc:References:From:In-Reply-To; b=gcZYmCrb/XakcrNd58e3ddXkD36SjuOB0rbEEBXmvH785qkb9J2/KK9BHMjqhPOdD 7sQkDObyATbGUuhcqKqGrEXCUiXVpdyfzVyO9YQLKKG/6aTVob2pgTNO1IuNaj6/dG APTwnMbRMSLtHHT7Y4dXM8O0DsNemxBY2KlH3MRjlmE8oQzAEkzRLGJMWHIIkVtuWZ uYUZPIsbhVuPx6iD5A4ScPvtRe3uQlffpuhazLJ3BF7hTUDanfv7K1hsChy+q6Vdo7 dSv4aGisHzzgaPOOwGrgGIt7wf0it+6ZKnZlcXBv5vbzxzUPz4LxcfeF9nN+6E4uS/ 6x5mu1VMCiK/Q== Message-ID: <2ff19317-8da9-4014-be04-27fc218b8eea@kernel.org> Date: Fri, 13 Nov 2026 20:00:02 +0100 X-Archived-By: MIME-Version: 1.0 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH v3 0/9] KVM: don't zap secondary MMU on permission upgrade To: =?UTF-8?Q?Carlos_L=C3=B3pez?= , kvm@vger.kernel.org, linux-mm@kvack.org Cc: linux-kernel@vger.kernel.org, linux-s390@vger.kernel.org, linux-riscv@lists.infradead.org, seanjc@google.com, pbonzini@redhat.com, akpm@linux-foundation.org, peterx@redhat.com, ljs@kernel.org, imbrenda@linux.ibm.com, borntraeger@linux.ibm.com, frankja@linux.ibm.com, Paul Walmsley , Palmer Dabbelt , Albert Ou , Alexandre Ghiti References: <20261112142039.907090-2-clopez@suse.de> From: "David Hildenbrand (Arm)" Content-Language: en-US Autocrypt: addr=david@kernel.org; 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