mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-06 10:57:46 +00:00
iommu/vt-d: Report page request faults for guest SVA
A pasid might be bound to a page table from a VM guest via the iommu ops.sva_bind_gpasid. In this case, when a DMA page fault is detected on the physical IOMMU, we need to inject the page fault request into the guest. After the guest completes handling the page fault, a page response need to be sent back via the iommu ops.page_response(). This adds support to report a page request fault. Any external module which is interested in handling this fault should regiester a notifier with iommu_register_device_fault_handler(). Co-developed-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Co-developed-by: Liu Yi L <yi.l.liu@intel.com> Signed-off-by: Jacob Pan <jacob.jun.pan@linux.intel.com> Signed-off-by: Liu Yi L <yi.l.liu@intel.com> Signed-off-by: Lu Baolu <baolu.lu@linux.intel.com> Reviewed-by: Kevin Tian <kevin.tian@intel.com> Link: https://lore.kernel.org/r/20200724014925.15523-11-baolu.lu@linux.intel.com Signed-off-by: Joerg Roedel <jroedel@suse.de>
This commit is contained in:
parent
19abcf70c2
commit
eb8d93ea3c
1 changed files with 85 additions and 18 deletions
|
@ -811,8 +811,63 @@ static void intel_svm_drain_prq(struct device *dev, int pasid)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
static int prq_to_iommu_prot(struct page_req_dsc *req)
|
||||||
|
{
|
||||||
|
int prot = 0;
|
||||||
|
|
||||||
|
if (req->rd_req)
|
||||||
|
prot |= IOMMU_FAULT_PERM_READ;
|
||||||
|
if (req->wr_req)
|
||||||
|
prot |= IOMMU_FAULT_PERM_WRITE;
|
||||||
|
if (req->exe_req)
|
||||||
|
prot |= IOMMU_FAULT_PERM_EXEC;
|
||||||
|
if (req->pm_req)
|
||||||
|
prot |= IOMMU_FAULT_PERM_PRIV;
|
||||||
|
|
||||||
|
return prot;
|
||||||
|
}
|
||||||
|
|
||||||
|
static int
|
||||||
|
intel_svm_prq_report(struct device *dev, struct page_req_dsc *desc)
|
||||||
|
{
|
||||||
|
struct iommu_fault_event event;
|
||||||
|
|
||||||
|
if (!dev || !dev_is_pci(dev))
|
||||||
|
return -ENODEV;
|
||||||
|
|
||||||
|
/* Fill in event data for device specific processing */
|
||||||
|
memset(&event, 0, sizeof(struct iommu_fault_event));
|
||||||
|
event.fault.type = IOMMU_FAULT_PAGE_REQ;
|
||||||
|
event.fault.prm.addr = desc->addr;
|
||||||
|
event.fault.prm.pasid = desc->pasid;
|
||||||
|
event.fault.prm.grpid = desc->prg_index;
|
||||||
|
event.fault.prm.perm = prq_to_iommu_prot(desc);
|
||||||
|
|
||||||
|
if (desc->lpig)
|
||||||
|
event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE;
|
||||||
|
if (desc->pasid_present) {
|
||||||
|
event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PASID_VALID;
|
||||||
|
event.fault.prm.flags |= IOMMU_FAULT_PAGE_RESPONSE_NEEDS_PASID;
|
||||||
|
}
|
||||||
|
if (desc->priv_data_present) {
|
||||||
|
/*
|
||||||
|
* Set last page in group bit if private data is present,
|
||||||
|
* page response is required as it does for LPIG.
|
||||||
|
* iommu_report_device_fault() doesn't understand this vendor
|
||||||
|
* specific requirement thus we set last_page as a workaround.
|
||||||
|
*/
|
||||||
|
event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_LAST_PAGE;
|
||||||
|
event.fault.prm.flags |= IOMMU_FAULT_PAGE_REQUEST_PRIV_DATA;
|
||||||
|
memcpy(event.fault.prm.private_data, desc->priv_data,
|
||||||
|
sizeof(desc->priv_data));
|
||||||
|
}
|
||||||
|
|
||||||
|
return iommu_report_device_fault(dev, &event);
|
||||||
|
}
|
||||||
|
|
||||||
static irqreturn_t prq_event_thread(int irq, void *d)
|
static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
{
|
{
|
||||||
|
struct intel_svm_dev *sdev = NULL;
|
||||||
struct intel_iommu *iommu = d;
|
struct intel_iommu *iommu = d;
|
||||||
struct intel_svm *svm = NULL;
|
struct intel_svm *svm = NULL;
|
||||||
int head, tail, handled = 0;
|
int head, tail, handled = 0;
|
||||||
|
@ -824,7 +879,6 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
tail = dmar_readq(iommu->reg + DMAR_PQT_REG) & PRQ_RING_MASK;
|
tail = dmar_readq(iommu->reg + DMAR_PQT_REG) & PRQ_RING_MASK;
|
||||||
head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK;
|
head = dmar_readq(iommu->reg + DMAR_PQH_REG) & PRQ_RING_MASK;
|
||||||
while (head != tail) {
|
while (head != tail) {
|
||||||
struct intel_svm_dev *sdev;
|
|
||||||
struct vm_area_struct *vma;
|
struct vm_area_struct *vma;
|
||||||
struct page_req_dsc *req;
|
struct page_req_dsc *req;
|
||||||
struct qi_desc resp;
|
struct qi_desc resp;
|
||||||
|
@ -860,6 +914,20 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
}
|
}
|
||||||
}
|
}
|
||||||
|
|
||||||
|
if (!sdev || sdev->sid != req->rid) {
|
||||||
|
struct intel_svm_dev *t;
|
||||||
|
|
||||||
|
sdev = NULL;
|
||||||
|
rcu_read_lock();
|
||||||
|
list_for_each_entry_rcu(t, &svm->devs, list) {
|
||||||
|
if (t->sid == req->rid) {
|
||||||
|
sdev = t;
|
||||||
|
break;
|
||||||
|
}
|
||||||
|
}
|
||||||
|
rcu_read_unlock();
|
||||||
|
}
|
||||||
|
|
||||||
result = QI_RESP_INVALID;
|
result = QI_RESP_INVALID;
|
||||||
/* Since we're using init_mm.pgd directly, we should never take
|
/* Since we're using init_mm.pgd directly, we should never take
|
||||||
* any faults on kernel addresses. */
|
* any faults on kernel addresses. */
|
||||||
|
@ -870,6 +938,17 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
if (!is_canonical_address(address))
|
if (!is_canonical_address(address))
|
||||||
goto bad_req;
|
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 (svm->flags & SVM_FLAG_GUEST_MODE) {
|
||||||
|
if (sdev && !intel_svm_prq_report(sdev->dev, req))
|
||||||
|
goto prq_advance;
|
||||||
|
else
|
||||||
|
goto bad_req;
|
||||||
|
}
|
||||||
|
|
||||||
/* If the mm is already defunct, don't handle faults. */
|
/* If the mm is already defunct, don't handle faults. */
|
||||||
if (!mmget_not_zero(svm->mm))
|
if (!mmget_not_zero(svm->mm))
|
||||||
goto bad_req;
|
goto bad_req;
|
||||||
|
@ -888,24 +967,11 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
goto invalid;
|
goto invalid;
|
||||||
|
|
||||||
result = QI_RESP_SUCCESS;
|
result = QI_RESP_SUCCESS;
|
||||||
invalid:
|
invalid:
|
||||||
mmap_read_unlock(svm->mm);
|
mmap_read_unlock(svm->mm);
|
||||||
mmput(svm->mm);
|
mmput(svm->mm);
|
||||||
bad_req:
|
bad_req:
|
||||||
/* Accounting for major/minor faults? */
|
WARN_ON(!sdev);
|
||||||
rcu_read_lock();
|
|
||||||
list_for_each_entry_rcu(sdev, &svm->devs, list) {
|
|
||||||
if (sdev->sid == req->rid)
|
|
||||||
break;
|
|
||||||
}
|
|
||||||
/* Other devices can go away, but the drivers are not permitted
|
|
||||||
* to unbind while any page faults might be in flight. So it's
|
|
||||||
* OK to drop the 'lock' here now we have it. */
|
|
||||||
rcu_read_unlock();
|
|
||||||
|
|
||||||
if (WARN_ON(&sdev->list == &svm->devs))
|
|
||||||
sdev = NULL;
|
|
||||||
|
|
||||||
if (sdev && sdev->ops && sdev->ops->fault_cb) {
|
if (sdev && sdev->ops && sdev->ops->fault_cb) {
|
||||||
int rwxp = (req->rd_req << 3) | (req->wr_req << 2) |
|
int rwxp = (req->rd_req << 3) | (req->wr_req << 2) |
|
||||||
(req->exe_req << 1) | (req->pm_req);
|
(req->exe_req << 1) | (req->pm_req);
|
||||||
|
@ -916,7 +982,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
and these can be NULL. Do not use them below this point! */
|
and these can be NULL. Do not use them below this point! */
|
||||||
sdev = NULL;
|
sdev = NULL;
|
||||||
svm = NULL;
|
svm = NULL;
|
||||||
no_pasid:
|
no_pasid:
|
||||||
if (req->lpig || req->priv_data_present) {
|
if (req->lpig || req->priv_data_present) {
|
||||||
/*
|
/*
|
||||||
* Per VT-d spec. v3.0 ch7.7, system software must
|
* Per VT-d spec. v3.0 ch7.7, system software must
|
||||||
|
@ -941,6 +1007,7 @@ static irqreturn_t prq_event_thread(int irq, void *d)
|
||||||
resp.qw3 = 0;
|
resp.qw3 = 0;
|
||||||
qi_submit_sync(iommu, &resp, 1, 0);
|
qi_submit_sync(iommu, &resp, 1, 0);
|
||||||
}
|
}
|
||||||
|
prq_advance:
|
||||||
head = (head + sizeof(*req)) & PRQ_RING_MASK;
|
head = (head + sizeof(*req)) & PRQ_RING_MASK;
|
||||||
}
|
}
|
||||||
|
|
||||||
|
|
Loading…
Reference in a new issue