From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AG47ELtoTHIxloFUnk4IdsZa0w2JXBCWVojo32oHJve82T57MQewW6sVepNr41XRcnnJk4ddP15d ARC-Seal: i=1; a=rsa-sha256; t=1521774610; cv=none; d=google.com; s=arc-20160816; b=xOBDTyaJyasKjn6Hae+sjNd+qrClgUPU5OdGSr7ZaqB32kaX5EHzWnyXmbNBuauMFC v8tUXRaA9HxOFwgLAg22dkHFcrphRDmQXPthuCUeFdWr2XGonnDlZvhIIS/n43j+Q31x ix6/ZiUkVAJ5q0h7RFlNfVIImpPznJcXvAivdmjJ12pmcUZY9JNtHfWK/Su2DVRbt2gB GgjduIjSILZi0blRpo+CGPRqj0BuqGZ9Y0Wmuaapu1EtLS7G8LQcf48XnoBHCtlkzlZV h+q+ObzRTGmojkgbIVFUTwtN9bVr0SbGsYGoLo81wTGBAzzCCohnEhapBynnSCNJYWJi LEmA== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=references:in-reply-to:message-id:date:subject:cc:to:from :arc-authentication-results; bh=qQfQd2vw6vP2TnZCHYUNFSJ+0JiOJeri/1Ac0iXKiQ4=; b=vysiAmZDIRWlnSnH62hO9hJ/4oCksH5yRLqtNbSFsCdlkwjbF+S14WHbEsfb1/3v74 EXIbEa07pfV4z71hHr6R4stj7wgn5t0dUTAH+3G7coGV5sqF6zfJlIf32bgOxDs+stzY OfAv8KQQ97/JkiaVZn0zYEMnwSkNuqiJtHnSoWAxLYFz8zjACGGt6Gb4Mw75pQSYg33p 1IJAHqtw03Pc5tXekg4d83SEHl3uRFsgewPU5fV9IXgnIWwE9wZCdDoCiS54PTNKbCm2 uS5sNWDhUzAqksJL1JFD0Os3Q8LQ/wi/LZipR8Bdr2Vl14kpoMqqtSeXUAmiUG9nt0f7 D86A== ARC-Authentication-Results: i=1; mx.google.com; spf=pass (google.com: best guess record for domain of jacob.jun.pan@linux.intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=jacob.jun.pan@linux.intel.com Authentication-Results: mx.google.com; spf=pass (google.com: best guess record for domain of jacob.jun.pan@linux.intel.com designates 134.134.136.65 as permitted sender) smtp.mailfrom=jacob.jun.pan@linux.intel.com X-Amp-Result: SKIPPED(no attachment in message) X-Amp-File-Uploaded: False X-ExtLoop1: 1 X-IronPort-AV: E=Sophos;i="5.48,348,1517904000"; d="scan'208";a="26316035" From: Jacob Pan To: iommu@lists.linux-foundation.org, LKML , Joerg Roedel , David Woodhouse , Jean-Philippe Brucker , Greg Kroah-Hartman , Rafael Wysocki Cc: "Liu, Yi L" , Lan Tianyu , "Tian, Kevin" , Raj Ashok , Alex Williamson , Jean Delvare , "Christoph Hellwig" , Jacob Pan Subject: [PATCH v4 17/22] iommu/intel-svm: report device page request Date: Thu, 22 Mar 2018 20:12:09 -0700 Message-Id: <1521774734-48433-18-git-send-email-jacob.jun.pan@linux.intel.com> X-Mailer: git-send-email 2.7.4 In-Reply-To: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> References: <1521774734-48433-1-git-send-email-jacob.jun.pan@linux.intel.com> X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-THRID: =?utf-8?q?1595696334534344100?= X-GMAIL-MSGID: =?utf-8?q?1595696334534344100?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: If the source device of a page request has its PASID table pointer bound to a guest, the first level page tables are owned by the guest. In this case, we shall let guest OS to manage page fault. This patch uses the IOMMU fault reporting API to send fault events, possibly via VFIO, to the guest OS. Once guest pages are fault in, guest will issue page response which will be passed down via the invalidation passdown APIs. Recoverable faults, such as page request reporting is not limitted to guest use. In kernel driver can also request a chance to receive fault notifications. Signed-off-by: Jacob Pan Signed-off-by: Ashok Raj --- drivers/iommu/intel-svm.c | 71 ++++++++++++++++++++++++++++++++++++++++------- include/linux/iommu.h | 1 + 2 files changed, 62 insertions(+), 10 deletions(-) diff --git a/drivers/iommu/intel-svm.c b/drivers/iommu/intel-svm.c index 99bc9bd..bdc702c 100644 --- a/drivers/iommu/intel-svm.c +++ b/drivers/iommu/intel-svm.c @@ -580,6 +580,56 @@ static bool is_canonical_address(u64 addr) return (((saddr << shift) >> shift) == saddr); } +static int prq_to_iommu_prot(struct page_req_dsc *req) +{ + int prot = 0; + + if (req->rd_req) + prot |= IOMMU_FAULT_READ; + if (req->wr_req) + prot |= IOMMU_FAULT_WRITE; + if (req->exe_req) + prot |= IOMMU_FAULT_EXEC; + if (req->priv_req) + prot |= IOMMU_FAULT_PRIV; + + return prot; +} + +static int intel_svm_prq_report(struct page_req_dsc *desc) +{ + int ret = 0; + struct iommu_fault_event event; + struct pci_dev *pdev; + + memset(&event, 0, sizeof(struct iommu_fault_event)); + pdev = pci_get_bus_and_slot(desc->bus, desc->devfn); + if (!pdev) { + pr_err("No PCI device found for PRQ [%02x:%02x.%d]\n", + desc->bus, PCI_SLOT(desc->devfn), + PCI_FUNC(desc->devfn)); + return -ENODEV; + } + + /* Fill in event data for device specific processing */ + event.type = IOMMU_FAULT_PAGE_REQ; + event.addr = (u64)desc->addr << VTD_PAGE_SHIFT; + event.pasid = desc->pasid; + event.page_req_group_id = desc->prg_index; + event.prot = prq_to_iommu_prot(desc); + event.last_req = desc->lpig; + event.pasid_valid = 1; + /* keep track of PRQ so that when the response comes back, we know + * whether we do group response or stream response. SRR[0] and + * private[54:32] bits in the descriptor are stored. + */ + event.iommu_private = *(u64 *)desc; + ret = iommu_report_device_fault(&pdev->dev, &event); + pci_dev_put(pdev); + + return ret; +} + static irqreturn_t prq_event_thread(int irq, void *d) { struct intel_iommu *iommu = d; @@ -628,6 +678,16 @@ static irqreturn_t prq_event_thread(int irq, void *d) goto no_pasid; } } + /* If address is not canonical, return invalid response */ + if (!is_canonical_address(address)) + goto bad_req; + + /* + * If prq is to be handled outside iommu driver via receiver of + * the fault notifiers, we skip the page response here. + */ + if (!intel_svm_prq_report(req)) + goto prq_advance; result = QI_RESP_INVALID; /* Since we're using init_mm.pgd directly, we should never take @@ -638,9 +698,6 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (!mmget_not_zero(svm->mm)) goto bad_req; - /* If address is not canonical, return invalid response */ - if (!is_canonical_address(address)) - goto bad_req; down_read(&svm->mm->mmap_sem); vma = find_extend_vma(svm->mm, address); @@ -673,12 +730,6 @@ static irqreturn_t prq_event_thread(int irq, void *d) if (WARN_ON(&sdev->list == &svm->devs)) sdev = NULL; - - if (sdev && sdev->ops && sdev->ops->fault_cb) { - int rwxp = (req->rd_req << 3) | (req->wr_req << 2) | - (req->exe_req << 1) | (req->priv_req); - sdev->ops->fault_cb(sdev->dev, req->pasid, req->addr, req->private, rwxp, result); - } /* We get here in the error case where the PASID lookup failed, and these can be NULL. Do not use them below this point! */ sdev = NULL; @@ -704,7 +755,7 @@ static irqreturn_t prq_event_thread(int irq, void *d) qi_submit_sync(&resp, iommu); } - + prq_advance: head = (head + sizeof(*req)) & PRQ_RING_MASK; } diff --git a/include/linux/iommu.h b/include/linux/iommu.h index 94cfda8..dbe2866 100644 --- a/include/linux/iommu.h +++ b/include/linux/iommu.h @@ -42,6 +42,7 @@ * if the IOMMU page table format is equivalent. */ #define IOMMU_PRIV (1 << 5) +#define IOMMU_EXEC (1 << 6) struct iommu_ops; struct iommu_group; -- 2.7.4