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Thu, 2 Jul 2020 03:00:09 +0000 (UTC) Subject: Re: [RFC v2 1/1] memory: Delete assertion in memory_region_unregister_iommu_notifier To: Peter Xu References: <54d2cdfd-97b8-9e1d-a607-d7a5e96be3a1@redhat.com> <20200629133403.GA266532@xz-x1> <2589d0e9-cc5b-a4df-8790-189b49f1a40e@redhat.com> <1b4eaaaf-c2ab-0da8-afb4-1b7b4221e6cf@redhat.com> <20200630052148-mutt-send-email-mst@kernel.org> <49f547e1-dd87-7abe-1075-9dcece75b641@redhat.com> <20200630152050.GC3138@xz-x1> <20200701121626.GD40675@xz-x1> <20200701124111.GF40675@xz-x1> From: Jason Wang Message-ID: <5407442b-f4a8-b41b-f386-e0c68ae58058@redhat.com> Date: Thu, 2 Jul 2020 11:00:08 +0800 User-Agent: Mozilla/5.0 (X11; Linux x86_64; rv:68.0) Gecko/20100101 Thunderbird/68.8.0 MIME-Version: 1.0 In-Reply-To: <20200701124111.GF40675@xz-x1> Content-Language: en-US X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Authentication-Results: relay.mimecast.com; auth=pass smtp.auth=CUSA124A263 smtp.mailfrom=jasowang@redhat.com X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Content-Type: text/plain; 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Tsirkin" , Juan Quintela , qemu-devel@nongnu.org, =?UTF-8?Q?Eugenio_P=c3=a9rez?= , Eric Auger , Paolo Bonzini Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" On 2020/7/1 下午8:41, Peter Xu wrote: > On Wed, Jul 01, 2020 at 08:30:07PM +0800, Jason Wang wrote: >>> I overlooked myself that the IR region will be there even if ir=off. >> >> Yes, but the point stands still but the issue is still if ir=off. >> >> >>> So I >>> think the assert should stand. >> >> Do you mean vhost can't trigger the assert()? If yes, I don't get how it >> can't. > Yes. vhost can only trigger the translate() via memory API. No matter whether > ir is on/off, the memory region is always enabled, so any access to 0xfeexxxxx > from memory API should still land at s->mr_ir, afaict, rather than the dmar region. Right. Thanks >