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[34.83.46.153]) by smtp.gmail.com with ESMTPSA id d9443c01a7336-2bf23a10165sm24198555ad.31.2026.05.29.10.03.32 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Fri, 29 May 2026 10:03:32 -0700 (PDT) Date: Fri, 29 May 2026 17:03:28 +0000 From: Samiullah Khawaja To: Ankit Soni Cc: David Woodhouse , Lu Baolu , Joerg Roedel , Will Deacon , Jason Gunthorpe , Robin Murphy , Kevin Tian , Alex Williamson , Shuah Khan , iommu@lists.linux.dev, linux-kernel@vger.kernel.org, kvm@vger.kernel.org, Saeed Mahameed , Adithya Jayachandran , Parav Pandit , Leon Romanovsky , William Tu , Pratyush Yadav , Pasha Tatashin , David Matlack , Andrew Morton , Chris Li , Pranjal Shrivastava , Vipin Sharma , YiFei Zhu Subject: Re: [PATCH v2 10/16] iommu: Restore and reattach preserved domains to devices Message-ID: References: <20260427175633.1978233-1-skhawaja@google.com> <20260427175633.1978233-11-skhawaja@google.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Type: text/plain; charset=us-ascii; format=flowed Content-Disposition: inline In-Reply-To: On Fri, May 29, 2026 at 04:43:42PM +0000, Ankit Soni wrote: >On Mon, Apr 27, 2026 at 05:56:27PM +0000, Samiullah Khawaja wrote: >> Restore the preserved domains by restoring the page tables using restore >> IOMMU domain op. Reattach the preserved domain to the device during >> default domain setup. While attaching, reuse the domain ID that was used >> in the previous kernel. The context entry setup is not needed as that is >> preserved during liveupdate. >> >> Signed-off-by: Samiullah Khawaja >> --- >> drivers/iommu/intel/iommu.c | 49 ++++++++++++++------ >> drivers/iommu/intel/iommu.h | 3 +- >> drivers/iommu/intel/nested.c | 2 +- >> drivers/iommu/iommu.c | 61 ++++++++++++++++++++++++- >> drivers/iommu/liveupdate.c | 78 ++++++++++++++++++++++++++++++++ >> include/linux/iommu-liveupdate.h | 50 ++++++++++++++++++++ >> 6 files changed, 224 insertions(+), 19 deletions(-) >> >> diff --git a/drivers/iommu/intel/iommu.c b/drivers/iommu/intel/iommu.c >> index 4118a0861f38..b90757164cd8 100644 >> --- a/drivers/iommu/intel/iommu.c >> +++ b/drivers/iommu/intel/iommu.c >> @@ -1031,7 +1031,8 @@ static bool first_level_by_default(struct intel_iommu *iommu) >> return true; >> } >> >> -int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu) >> +int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu, >> + int restore_did) >> { >> struct iommu_domain_info *info, *curr; >> int num, ret = -ENOSPC; >> @@ -1051,8 +1052,11 @@ int domain_attach_iommu(struct dmar_domain *domain, struct intel_iommu *iommu) >> return 0; >> } >> >> - num = ida_alloc_range(&iommu->domain_ida, IDA_START_DID, >> - cap_ndoms(iommu->cap) - 1, GFP_KERNEL); >> + if (restore_did >= IDA_START_DID) >> + num = restore_did; >> + else >> + num = ida_alloc_range(&iommu->domain_ida, IDA_START_DID, >> + cap_ndoms(iommu->cap) - 1, GFP_KERNEL); >> if (num < 0) { >> pr_err("%s: No free domain ids\n", iommu->name); >> goto err_unlock; >> @@ -1320,10 +1324,14 @@ static int dmar_domain_attach_device(struct dmar_domain *domain, >> { >> struct device_domain_info *info = dev_iommu_priv_get(dev); >> struct intel_iommu *iommu = info->iommu; >> + struct device_ser *device_ser = NULL; > >Typo here? iommu_device_ser. >compiles because dev_iommu_restored_state() returns void * and the >variable is only null-checked, never dereferenced. Agreed. Will update this. > >Ankit > >> unsigned long flags; >> int ret; >> >> - ret = domain_attach_iommu(domain, iommu); >> + device_ser = dev_iommu_restored_state(dev); >> + >> + ret = domain_attach_iommu(domain, iommu, >> + dev_iommu_restore_did(dev, &domain->domain)); >> if (ret) >> return ret; >> [snip] >> static inline struct iommu_hw_ser *iommu_get_preserved_data(u64 token, enum iommu_type_ser type) >> { >> return NULL; >> -- >> 2.54.0.545.g6539524ca2-goog >> Thanks, Sami