[Xen-devel] [PATCH] VT-d: Chop down the DMAR_OPERATION_TIMEOUT to a low number of milliseconds.

[Quan Xu <quan.xu@xxxxxxxxx>]

We confirmed with VT-d hardware team that 1ms is large enough for IOMMU
internal flush. So We can change the DMAR_OPERATION_TIMEOUT from 1000 ms
to 1 ms.

Signed-off-by: Quan Xu <quan.xu@xxxxxxxxx>

CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Andrew Cooper <andrew.cooper3@xxxxxxxxxx>
CC: Feng Wu <feng.wu@xxxxxxxxx>
CC: Kevin Tian <kevin.tian@xxxxxxxxx>
---
 xen/drivers/passthrough/vtd/dmar.h | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/xen/drivers/passthrough/vtd/dmar.h 
b/xen/drivers/passthrough/vtd/dmar.h
index 729b603..4b14368 100644
--- a/xen/drivers/passthrough/vtd/dmar.h
+++ b/xen/drivers/passthrough/vtd/dmar.h
@@ -106,7 +106,7 @@ struct acpi_atsr_unit *acpi_find_matched_atsr_unit(const 
struct pci_dev *);
 #define RMRR_TYPE 2
 #define ATSR_TYPE 3
 
-#define DMAR_OPERATION_TIMEOUT MILLISECS(1000)
+#define DMAR_OPERATION_TIMEOUT MILLISECS(1)
 
 #define IOMMU_WAIT_OP(iommu, offset, op, cond, sts) \
 do {                                                \
-- 
1.9.1


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