Olaf Hering
2d4e82ad73
OBS-URL: https://build.opensuse.org/package/show/Virtualization/xen?expand=0&rev=137
75 lines
3.0 KiB
Diff
75 lines
3.0 KiB
Diff
# HG changeset patch
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# User Tim Deegan <Tim.Deegan@citrix.com>
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# Date 1313145221 -3600
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# Node ID 84e3706df07a1963e23cd3875d8603917657d462
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# Parent cb22fa57ff252893b6adb1481e09b1287eacd990
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Passthrough: disable bus-mastering on any card that causes an IOMMU fault.
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This stops the card from raising back-to-back faults and live-locking
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the CPU that handles them.
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Signed-off-by: Tim Deegan <tim@xen.org>
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Acked-by: Wei Wang2 <wei.wang2@amd.com>
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Acked-by: Allen M Kay <allen.m.kay@intel.com>
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Index: xen-4.1.1-testing/xen/drivers/passthrough/amd/iommu_init.c
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===================================================================
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--- xen-4.1.1-testing.orig/xen/drivers/passthrough/amd/iommu_init.c
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+++ xen-4.1.1-testing/xen/drivers/passthrough/amd/iommu_init.c
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@@ -462,7 +462,7 @@ static hw_irq_controller iommu_msi_type
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static void parse_event_log_entry(u32 entry[])
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{
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- u16 domain_id, device_id;
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+ u16 domain_id, device_id, bdf, cword;
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u32 code;
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u64 *addr;
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char * event_str[] = {"ILLEGAL_DEV_TABLE_ENTRY",
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@@ -497,6 +497,18 @@ static void parse_event_log_entry(u32 en
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"%s: domain = %d, device id = 0x%04x, "
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"fault address = 0x%"PRIx64"\n",
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event_str[code-1], domain_id, device_id, *addr);
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+
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+ /* Tell the device to stop DMAing; we can't rely on the guest to
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+ * control it for us. */
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+ for ( bdf = 0; bdf < ivrs_bdf_entries; bdf++ )
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+ if ( get_dma_requestor_id(bdf) == device_id )
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+ {
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+ cword = pci_conf_read16(PCI_BUS(bdf), PCI_SLOT(bdf),
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+ PCI_FUNC(bdf), PCI_COMMAND);
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+ pci_conf_write16(PCI_BUS(bdf), PCI_SLOT(bdf),
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+ PCI_FUNC(bdf), PCI_COMMAND,
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+ cword & ~PCI_COMMAND_MASTER);
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+ }
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}
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else
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{
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Index: xen-4.1.1-testing/xen/drivers/passthrough/vtd/iommu.c
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===================================================================
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--- xen-4.1.1-testing.orig/xen/drivers/passthrough/vtd/iommu.c
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+++ xen-4.1.1-testing/xen/drivers/passthrough/vtd/iommu.c
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@@ -887,7 +887,7 @@ static void iommu_page_fault(int irq, vo
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while (1)
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{
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u8 fault_reason;
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- u16 source_id;
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+ u16 source_id, cword;
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u32 data;
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u64 guest_addr;
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int type;
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@@ -920,6 +920,14 @@ static void iommu_page_fault(int irq, vo
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iommu_page_fault_do_one(iommu, type, fault_reason,
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source_id, guest_addr);
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+ /* Tell the device to stop DMAing; we can't rely on the guest to
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+ * control it for us. */
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+ cword = pci_conf_read16(PCI_BUS(source_id), PCI_SLOT(source_id),
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+ PCI_FUNC(source_id), PCI_COMMAND);
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+ pci_conf_write16(PCI_BUS(source_id), PCI_SLOT(source_id),
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+ PCI_FUNC(source_id), PCI_COMMAND,
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+ cword & ~PCI_COMMAND_MASTER);
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+
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fault_index++;
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if ( fault_index > cap_num_fault_regs(iommu->cap) )
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fault_index = 0;
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