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[80.230.24.117]) by smtp.gmail.com with ESMTPSA id 5b1f17b1804b1-495499d1d4asm17178085e9.2.2026.07.16.22.48.04 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 16 Jul 2026 22:48:05 -0700 (PDT) Date: Fri, 17 Jul 2026 01:48:01 -0400 From: "Michael S. Tsirkin" To: "David Hildenbrand (Arm)" Cc: Greg Kroah-Hartman , Hari Mishal , Jason Wang , Xuan Zhuo , Eugenio =?iso-8859-1?Q?P=E9rez?= , virtualization@lists.linux.dev, linux-kernel@vger.kernel.org, elena.reshetova@intel.com, carlos.bilbao.osdev@gmail.com Subject: Re: [PATCH v2 1/4] virtio-mem: validate device-reported block size Message-ID: <20260717014134-mutt-send-email-mst@kernel.org> References: <20260715142337.22811-2-harimishal1@gmail.com> <20260715164139.40957-1-harimishal1@gmail.com> <2026071635-relive-flogging-2a81@gregkh> <4dda47ba-534a-4297-a25e-0d63d9167033@kernel.org> Precedence: bulk X-Mailing-List: linux-kernel@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii Content-Disposition: inline In-Reply-To: <4dda47ba-534a-4297-a25e-0d63d9167033@kernel.org> On Thu, Jul 16, 2026 at 05:59:05PM +0200, David Hildenbrand (Arm) wrote: > > Or do we just always trust virtio mem devices explicitly? > > It's hard for me to understand where we draw the line, really. > > But maybe MST can clarify what we care about in virtio world where the > hypervisor is fully in charge of the device, Generally: - The guest is expected to whitelist drivers (most drivers have not been audited). - Denial of service by the hypervisor is not considered a threat (this is how cloud vendors charge their clients, by denying service to whoever did not pay). -- MST