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mx.microsoft.com 1; spf=pass smtp.mailfrom=intel.com; dmarc=pass action=none header.from=intel.com; dkim=pass header.d=intel.com; arc=none Authentication-Results: dkim=none (message not signed) header.d=none;dmarc=none action=none header.from=intel.com; Received: from SJ0PR11MB4798.namprd11.prod.outlook.com (2603:10b6:a03:2d5::12) by SJ5PPF50B3E12BC.namprd11.prod.outlook.com (2603:10b6:a0f:fc02::828) with Microsoft SMTP Server (version=TLS1_2, cipher=TLS_ECDHE_RSA_WITH_AES_256_GCM_SHA384) id 15.20.9203.13; Wed, 15 Oct 2025 12:35:18 +0000 Received: from SJ0PR11MB4798.namprd11.prod.outlook.com ([fe80::d946:6abf:6e7e:fd1e]) by SJ0PR11MB4798.namprd11.prod.outlook.com ([fe80::d946:6abf:6e7e:fd1e%7]) with mapi id 15.20.9228.010; Wed, 15 Oct 2025 12:35:18 +0000 Message-ID: <847a4b9a-2de1-4c97-b5a4-0cfa6827bf63@intel.com> Date: Wed, 15 Oct 2025 20:42:04 +0800 User-Agent: Mozilla Thunderbird Subject: Re: [PATCH 3/3] intel_iommu: Fix DMA failure when guest switches IOMMU domain To: Zhenzhong Duan , CC: , , , References: <20251015102003.279239-1-zhenzhong.duan@intel.com> <20251015102003.279239-4-zhenzhong.duan@intel.com> Content-Language: en-US From: Yi Liu In-Reply-To: <20251015102003.279239-4-zhenzhong.duan@intel.com> Content-Type: text/plain; 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envelope-from=yi.l.liu@intel.com; helo=mgamail.intel.com X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 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, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On 2025/10/15 18:20, Zhenzhong Duan wrote: > Kernel allows user to switch IOMMU domain, e.g., switch between DMA > and identity domain. When this happen in IOMMU scalable mode, a pasid > cache invalidation request is sent, this request is ignored by vIOMMU > which leads to device binding to wrong address space, then DMA fails. > > This issue exists in scalable mode with both first stage and second > stage translations, both emulated and passthrough devices. does it affect emulated device? The domain switching should have IOTLB/PIOTLB invalidation. right? Then the emulated device should not been affected. > > Take network device for example, below sequence trigger issue: > > 1. start a guest with iommu=pt > 2. echo 0000:01:00.0 > /sys/bus/pci/drivers/virtio-pci/unbind > 3. echo DMA > /sys/kernel/iommu_groups/6/type > 4. echo 0000:01:00.0 > /sys/bus/pci/drivers/virtio-pci/bind > 5. Ping test > > Fix it by switching address space in invalidation handler. a good catch. > > Fixes: 4a4f219e8a10 ("intel_iommu: add scalable-mode option to make scalable mode work") > Signed-off-by: Zhenzhong Duan > --- > hw/i386/intel_iommu.c | 6 +++++- > 1 file changed, 5 insertions(+), 1 deletion(-) > > diff --git a/hw/i386/intel_iommu.c b/hw/i386/intel_iommu.c > index d656e9c256..30275a4f23 100644 > --- a/hw/i386/intel_iommu.c > +++ b/hw/i386/intel_iommu.c > @@ -3104,7 +3104,7 @@ static void vtd_pasid_cache_sync_locked(gpointer key, gpointer value, > * reset where the whole guest memory is treated as zeroed. > */ > pc_entry->valid = false; > - return; > + goto switch_as; > } > > /* > @@ -3134,6 +3134,10 @@ static void vtd_pasid_cache_sync_locked(gpointer key, gpointer value, > > pc_entry->pasid_entry = pe; > pc_entry->valid = true; > + > +switch_as: > + vtd_switch_address_space(vtd_as); > + vtd_address_space_sync(vtd_as); > } > > static void vtd_pasid_cache_sync(IntelIOMMUState *s, VTDPASIDCacheInfo *pc_info) The change looks good to me. You might want to adjust a bit per the comment in patch 01. Regards, Yi Liu