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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [Patch v11 3/3] vt-d: fix vt-d Device-TLB flush timeout issue
From: Quan Xu <quan.xu@xxxxxxxxx>
If Device-TLB flush timed out, we hide the target ATS device
immediately and crash the domain owning this ATS device. If
impacted domain is hardware domain, just throw out a warning.
By hiding the device, we make sure it can't be assigned to any
domain any longer (see device_assigned).
v11:
1. Pass down struct pci_dev *, instead of SBDF inside struct
pci_ats_dev.
2. change invalidate_sync() back as I add a specific function
- dev_invalidate_sync() for device IOTLB.
Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>
---
xen/drivers/passthrough/pci.c | 6 +--
xen/drivers/passthrough/vtd/extern.h | 5 +-
xen/drivers/passthrough/vtd/qinval.c | 86 +++++++++++++++++++++++++++++------
xen/drivers/passthrough/vtd/x86/ats.c | 7 +--
xen/include/xen/pci.h | 1 +
5 files changed, 82 insertions(+), 23 deletions(-)
diff --git a/xen/drivers/passthrough/pci.c b/xen/drivers/passthrough/pci.c
index 98936f55c..843dc88 100644
--- a/xen/drivers/passthrough/pci.c
+++ b/xen/drivers/passthrough/pci.c
@@ -419,7 +419,7 @@ static void free_pdev(struct pci_seg *pseg, struct pci_dev
*pdev)
xfree(pdev);
}
-static void _pci_hide_device(struct pci_dev *pdev)
+void pci_hide_existing_device(struct pci_dev *pdev)
{
if ( pdev->domain )
return;
@@ -436,7 +436,7 @@ int __init pci_hide_device(int bus, int devfn)
pdev = alloc_pdev(get_pseg(0), bus, devfn);
if ( pdev )
{
- _pci_hide_device(pdev);
+ pci_hide_existing_device(pdev);
rc = 0;
}
pcidevs_unlock();
@@ -466,7 +466,7 @@ int __init pci_ro_device(int seg, int bus, int devfn)
}
__set_bit(PCI_BDF2(bus, devfn), pseg->ro_map);
- _pci_hide_device(pdev);
+ pci_hide_existing_device(pdev);
return 0;
}
diff --git a/xen/drivers/passthrough/vtd/extern.h
b/xen/drivers/passthrough/vtd/extern.h
index 45357f2..94ca97a 100644
--- a/xen/drivers/passthrough/vtd/extern.h
+++ b/xen/drivers/passthrough/vtd/extern.h
@@ -21,6 +21,7 @@
#define _VTD_EXTERN_H_
#include "dmar.h"
+#include "../ats.h"
#include <xen/keyhandler.h>
#define VTDPREFIX "[VT-D]"
@@ -60,8 +61,8 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
u64 addr, unsigned int size_order, u64 type);
int __must_check qinval_device_iotlb_sync(struct iommu *iommu,
- u32 max_invs_pend,
- u16 sid, u16 size, u64 addr);
+ struct pci_ats_dev *ats_dev,
+ u16 did, u16 size, u64 addr);
unsigned int get_cache_line_size(void);
void cacheline_flush(char *);
diff --git a/xen/drivers/passthrough/vtd/qinval.c
b/xen/drivers/passthrough/vtd/qinval.c
index 9116588..bea3e86 100644
--- a/xen/drivers/passthrough/vtd/qinval.c
+++ b/xen/drivers/passthrough/vtd/qinval.c
@@ -30,8 +30,7 @@
#define IOMMU_QI_TIMEOUT MILLISECS(1)
-static int __must_check invalidate_sync(struct iommu *iommu,
- bool_t flush_dev_iotlb);
+static int __must_check invalidate_sync(struct iommu *iommu);
static void print_qi_regs(struct iommu *iommu)
{
@@ -103,7 +102,7 @@ static int __must_check
queue_invalidate_context_sync(struct iommu *iommu,
unmap_vtd_domain_page(qinval_entries);
- return invalidate_sync(iommu, 0);
+ return invalidate_sync(iommu);
}
static int __must_check queue_invalidate_iotlb_sync(struct iommu *iommu,
@@ -140,7 +139,7 @@ static int __must_check queue_invalidate_iotlb_sync(struct
iommu *iommu,
qinval_update_qtail(iommu, index);
spin_unlock_irqrestore(&iommu->register_lock, flags);
- return invalidate_sync(iommu, 0);
+ return invalidate_sync(iommu);
}
static int __must_check queue_invalidate_wait(struct iommu *iommu,
@@ -200,20 +199,81 @@ static int __must_check queue_invalidate_wait(struct
iommu *iommu,
return -EOPNOTSUPP;
}
-static int __must_check invalidate_sync(struct iommu *iommu,
- bool_t flush_dev_iotlb)
+static int __must_check invalidate_sync(struct iommu *iommu)
{
struct qi_ctrl *qi_ctrl = iommu_qi_ctrl(iommu);
if ( qi_ctrl->qinval_maddr )
- return queue_invalidate_wait(iommu, 0, 1, 1, flush_dev_iotlb);
+ return queue_invalidate_wait(iommu, 0, 1, 1, 0);
return 0;
}
+static void dev_invalidate_iotlb_timeout(struct iommu *iommu, u16 did,
+ struct pci_ats_dev *ats_dev)
+{
+ struct domain *d = NULL;
+ struct pci_dev *pdev;
+
+ if ( test_bit(did, iommu->domid_bitmap) )
+ d = rcu_lock_domain_by_id(iommu->domid_map[did]);
+
+ /*
+ * In case the domain has been freed or the IOMMU domid bitmap is
+ * not valid, the device no longer belongs to this domain.
+ */
+ if ( d == NULL )
+ return;
+
+ pcidevs_lock();
+
+ for_each_pdev(d, pdev)
+ {
+ if ( (pdev->seg == ats_dev->seg) &&
+ (pdev->bus == ats_dev->bus) &&
+ (pdev->devfn == ats_dev->devfn) )
+ {
+ ASSERT(pdev->domain);
+ list_del(&pdev->domain_list);
+ pdev->domain = NULL;
+ pci_hide_existing_device(pdev);
+ break;
+ }
+ }
+
+ pcidevs_unlock();
+
+ if ( !is_hardware_domain(d) )
+ domain_crash(d);
+ else
+ printk(XENLOG_WARNING VTDPREFIX
+ " dom%d: ATS device %04x:%02x:%02x.%u flush failed\n",
+ d->domain_id, ats_dev->seg, ats_dev->bus,
+ PCI_SLOT(ats_dev->devfn), PCI_FUNC(ats_dev->devfn));
+
+ rcu_unlock_domain(d);
+}
+
+static int __must_check dev_invalidate_sync(struct iommu *iommu, u16 did,
+ struct pci_ats_dev *ats_dev)
+{
+ struct qi_ctrl *qi_ctrl = iommu_qi_ctrl(iommu);
+ int rc = 0;
+
+ if ( qi_ctrl->qinval_maddr )
+ {
+ rc = queue_invalidate_wait(iommu, 0, 1, 1, 1);
+
+ if ( rc == -ETIMEDOUT )
+ dev_invalidate_iotlb_timeout(iommu, did, ats_dev);
+ }
+
+ return rc;
+}
+
int qinval_device_iotlb_sync(struct iommu *iommu,
- u32 max_invs_pend,
- u16 sid, u16 size, u64 addr)
+ struct pci_ats_dev *ats_dev,
+ u16 did, u16 size, u64 addr)
{
unsigned long flags;
unsigned int index;
@@ -229,9 +289,9 @@ int qinval_device_iotlb_sync(struct iommu *iommu,
qinval_entry->q.dev_iotlb_inv_dsc.lo.type = TYPE_INVAL_DEVICE_IOTLB;
qinval_entry->q.dev_iotlb_inv_dsc.lo.res_1 = 0;
- qinval_entry->q.dev_iotlb_inv_dsc.lo.max_invs_pend = max_invs_pend;
+ qinval_entry->q.dev_iotlb_inv_dsc.lo.max_invs_pend =
ats_dev->ats_queue_depth;
qinval_entry->q.dev_iotlb_inv_dsc.lo.res_2 = 0;
- qinval_entry->q.dev_iotlb_inv_dsc.lo.sid = sid;
+ qinval_entry->q.dev_iotlb_inv_dsc.lo.sid = PCI_BDF2(ats_dev->bus,
ats_dev->devfn);
qinval_entry->q.dev_iotlb_inv_dsc.lo.res_3 = 0;
qinval_entry->q.dev_iotlb_inv_dsc.hi.size = size;
@@ -242,7 +302,7 @@ int qinval_device_iotlb_sync(struct iommu *iommu,
qinval_update_qtail(iommu, index);
spin_unlock_irqrestore(&iommu->register_lock, flags);
- return invalidate_sync(iommu, 1);
+ return dev_invalidate_sync(iommu, did, ats_dev);
}
static int __must_check queue_invalidate_iec_sync(struct iommu *iommu,
@@ -273,7 +333,7 @@ static int __must_check queue_invalidate_iec_sync(struct
iommu *iommu,
qinval_update_qtail(iommu, index);
spin_unlock_irqrestore(&iommu->register_lock, flags);
- ret = invalidate_sync(iommu, 0);
+ ret = invalidate_sync(iommu);
/*
* reading vt-d architecture register will ensure
diff --git a/xen/drivers/passthrough/vtd/x86/ats.c
b/xen/drivers/passthrough/vtd/x86/ats.c
index dfa4d30..ecae94c 100644
--- a/xen/drivers/passthrough/vtd/x86/ats.c
+++ b/xen/drivers/passthrough/vtd/x86/ats.c
@@ -116,7 +116,6 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
list_for_each_entry( pdev, &ats_devices, list )
{
- u16 sid = PCI_BDF2(pdev->bus, pdev->devfn);
bool_t sbit;
int rc = 0;
@@ -134,8 +133,7 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
/* invalidate all translations: sbit=1,bit_63=0,bit[62:12]=1 */
sbit = 1;
addr = (~0UL << PAGE_SHIFT_4K) & 0x7FFFFFFFFFFFFFFF;
- rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth,
- sid, sbit, addr);
+ rc = qinval_device_iotlb_sync(iommu, pdev, did, sbit, addr);
break;
case DMA_TLB_PSI_FLUSH:
if ( !device_in_domain(iommu, pdev, did) )
@@ -154,8 +152,7 @@ int dev_invalidate_iotlb(struct iommu *iommu, u16 did,
addr |= (((u64)1 << (size_order - 1)) - 1) << PAGE_SHIFT_4K;
}
- rc = qinval_device_iotlb_sync(iommu, pdev->ats_queue_depth,
- sid, sbit, addr);
+ rc = qinval_device_iotlb_sync(iommu, pdev, did, sbit, addr);
break;
default:
dprintk(XENLOG_WARNING VTDPREFIX, "invalid vt-d flush type\n");
diff --git a/xen/include/xen/pci.h b/xen/include/xen/pci.h
index 6ed29dd..e4940cd 100644
--- a/xen/include/xen/pci.h
+++ b/xen/include/xen/pci.h
@@ -118,6 +118,7 @@ int pci_add_device(u16 seg, u8 bus, u8 devfn,
int pci_remove_device(u16 seg, u8 bus, u8 devfn);
int pci_ro_device(int seg, int bus, int devfn);
int pci_hide_device(int bus, int devfn);
+void pci_hide_existing_device(struct pci_dev *pdev);
struct pci_dev *pci_get_pdev(int seg, int bus, int devfn);
struct pci_dev *pci_get_real_pdev(int seg, int bus, int devfn);
struct pci_dev *pci_get_pdev_by_domain(
--
1.9.1
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