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Wed, 2 Sep 2020 14:24:52 +0000 (UTC) Subject: Re: [RFC v8 5/5] memory: Skip bad range assertion if notifier is DEVIOTLB type To: =?UTF-8?Q?Eugenio_P=c3=a9rez?= , Peter Xu , qemu-devel@nongnu.org References: <20200901142608.24481-1-eperezma@redhat.com> <20200901142608.24481-6-eperezma@redhat.com> From: Auger Eric Message-ID: <44d9e8a5-79fa-11c8-9ec1-4c3d76929408@redhat.com> Date: Wed, 2 Sep 2020 16:24:50 +0200 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.5.0 MIME-Version: 1.0 In-Reply-To: <20200901142608.24481-6-eperezma@redhat.com> X-Scanned-By: MIMEDefang 2.84 on 10.5.11.23 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=eric.auger@redhat.com X-Mimecast-Spam-Score: 0.002 X-Mimecast-Originator: redhat.com Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 8bit Content-Language: en-US Received-SPF: pass client-ip=205.139.110.120; envelope-from=eric.auger@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/09/02 02:26:30 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -23 X-Spam_score: -2.4 X-Spam_bar: -- X-Spam_report: (-2.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, NICE_REPLY_A=-0.324, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=unavailable autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Peter Maydell , Aleksandar Rikalo , Yan Zhao , Eduardo Habkost , "Michael S. Tsirkin" , qemu-ppc@nongnu.org, Jason Wang , Juan Quintela , qemu-arm@nongnu.org, =?UTF-8?Q?Herv=c3=a9_Poussineau?= , Avi Kivity , Paolo Bonzini , Richard Henderson , David Gibson Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" Hi Eugenio, On 9/1/20 4:26 PM, Eugenio Pérez wrote: > Signed-off-by: Eugenio Pérez Please could you explain in the commit message why you need to remove the assert()? I know you described the assert() in the cover letter but the commit msg is the one that remains. > --- > softmmu/memory.c | 13 +++++++++++-- > 1 file changed, 11 insertions(+), 2 deletions(-) > > diff --git a/softmmu/memory.c b/softmmu/memory.c > index 09b3443eac..3ee99b4dc0 100644 > --- a/softmmu/memory.c > +++ b/softmmu/memory.c > @@ -1895,6 +1895,7 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier, > { > IOMMUTLBEntry *entry = &event->entry; > hwaddr entry_end = entry->iova + entry->addr_mask; > + IOMMUTLBEntry tmp = *entry; > > /* > * Skip the notification if the notification does not overlap > @@ -1904,10 +1905,18 @@ void memory_region_notify_iommu_one(IOMMUNotifier *notifier, > return; > } > > - assert(entry->iova >= notifier->start && entry_end <= notifier->end); > + if (notifier->notifier_flags & IOMMU_NOTIFIER_DEVIOTLB) { > + /* Crop (iova, addr_mask) to range */ > + tmp.iova = MAX(tmp.iova, notifier->start); > + tmp.addr_mask = MIN(entry_end, notifier->end) - tmp.iova; > + /* Confirm no underflow */ > + assert(MIN(entry_end, notifier->end) >= tmp.iova); > + } else { > + assert(entry->iova >= notifier->start && entry_end <= notifier->end); > + } > > if (event->type & notifier->notifier_flags) { > - notifier->notify(notifier, entry); > + notifier->notify(notifier, &tmp); > } > } > > Thanks Eric