[Xen-devel] [PATCH v4 0/3] VT-d Device-TLB flush issue

[Quan Xu <quan.xu@xxxxxxxxx>]

This patches are based on Kevin Tian's previous discussion 'Revisit VT-d 
asynchronous flush issue'.
Fix current timeout concern and also allow limited ATS support in a light way:

1. Check VT-d Device-TLB flush error.
   This patch checks all kinds of error and all the way up the call trees of 
VT-d Device-TLB flush.

2. Reduce spin timeout to 1ms, which can be boot-time changed with 
'iommu_qi_timeout_ms'.
   For example:
           multiboot /boot/xen.gz ats=1 iommu_qi_timeout_ms=100

3. Fix vt-d Device-TLB flush timeout issue.
    Now if IOTLB/Context/IETC flush is timeout, panic hypervisor. The coming 
patch
    set will fix it.

    If Device-TLB flush is timeout, we'll hide the target ATS
    device and crash the domain owning this ATS device.

    If impacted domain is hardware domain, just throw out a warning.

    The hided Device will be disallowed to be further assigned to
    any domain.

--

 * DMAR_OPERATION_TIMEOUT should be also chopped down to a low number of 
milliseconds.
   As Kevin Tian mentioned in 'Revisit VT-d asynchronous flush issue', We also 
confirmed with hardware team
   that 1ms is large enough for IOMMU internal flush. So I can change 
DMAR_OPERATION_TIMEOUT from 1000 ms to 1 ms.

   IOMMU_WAIT_OP() is only for VT-d registers read/write, and there is also a 
panic. We need a further discussion
   whether or how to remove this panic in next patch set.

 * if IOTLB/Context/IETC flush is timeout, panic hypervisor. The coming patch 
set will fix it.


Quan Xu (3):
  VT-d: Check VT-d Device-TLB flush error.
  VT-d: Reduce spin timeout to 1ms, which can be boot-time changed.
  VT-d: Fix vt-d Device-TLB flush timeout issue.

 xen/arch/x86/acpi/power.c                     |   8 +-
 xen/arch/x86/crash.c                          |   3 +-
 xen/arch/x86/domain_build.c                   |   5 +-
 xen/arch/x86/mm.c                             |  15 ++-
 xen/arch/x86/mm/p2m-ept.c                     |  14 ++-
 xen/arch/x86/mm/p2m-pt.c                      |  14 ++-
 xen/arch/x86/mm/p2m.c                         |  19 +++-
 xen/arch/x86/x86_64/mm.c                      |   7 +-
 xen/common/domain.c                           |   3 +-
 xen/common/grant_table.c                      |   5 +-
 xen/common/memory.c                           |  13 ++-
 xen/drivers/passthrough/amd/iommu_init.c      |   4 +-
 xen/drivers/passthrough/amd/pci_amd_iommu.c   |   4 +-
 xen/drivers/passthrough/arm/smmu.c            |  13 ++-
 xen/drivers/passthrough/iommu.c               |  47 +++++---
 xen/drivers/passthrough/pci.c                 |   2 +-
 xen/drivers/passthrough/vtd/extern.h          |   6 +-
 xen/drivers/passthrough/vtd/iommu.c           | 157 ++++++++++++++++++++------
 xen/drivers/passthrough/vtd/qinval.c          |  93 ++++++++++++++-
 xen/drivers/passthrough/vtd/quirks.c          |  26 +++--
 xen/drivers/passthrough/vtd/x86/ats.c         |  13 +++
 xen/drivers/passthrough/vtd/x86/vtd.c         |  13 ++-
 xen/drivers/passthrough/x86/iommu.c           |   6 +-
 xen/include/asm-x86/hvm/svm/amd-iommu-proto.h |   4 +-
 xen/include/asm-x86/iommu.h                   |   2 +-
 xen/include/xen/iommu.h                       |  20 ++--
 26 files changed, 403 insertions(+), 113 deletions(-)

-- 
1.9.1


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