[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
[Qemu-ppc] [PATCH qemu v2] vfio/spapr: Allow fallback to SPAPR TCE IOMMU
From: |
Alexey Kardashevskiy |
Subject: |
[Qemu-ppc] [PATCH qemu v2] vfio/spapr: Allow fallback to SPAPR TCE IOMMU v1 |
Date: |
Tue, 12 Dec 2017 16:16:19 +1100 |
The vfio_iommu_spapr_tce driver advertises kernel's support for
v1 and v2 IOMMU support, however it is not always possible to use
the requested IOMMU type. For example, a pseries host platform does not
support dynamic DMA windows so v2 cannot initialize and QEMU fails to
start.
This adds a fallback to the v1 IOMMU if v2 cannot be used.
Fixes: 318f67ce1371 "vfio: spapr: Add DMA memory preregistering (SPAPR IOMMU
v2)"
Signed-off-by: Alexey Kardashevskiy <address@hidden>
---
Changes:
v2:
* updated commit log
---
hw/vfio/common.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/hw/vfio/common.c b/hw/vfio/common.c
index 7b2924c..cd81cc9 100644
--- a/hw/vfio/common.c
+++ b/hw/vfio/common.c
@@ -1040,6 +1040,11 @@ static int vfio_connect_container(VFIOGroup *group,
AddressSpace *as,
v2 ? VFIO_SPAPR_TCE_v2_IOMMU : VFIO_SPAPR_TCE_IOMMU;
ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type);
if (ret) {
+ container->iommu_type = VFIO_SPAPR_TCE_IOMMU;
+ v2 = false;
+ ret = ioctl(fd, VFIO_SET_IOMMU, container->iommu_type);
+ }
+ if (ret) {
error_setg_errno(errp, errno, "failed to set iommu for container");
ret = -errno;
goto free_container_exit;
--
2.11.0
- [Qemu-ppc] [PATCH qemu v2] vfio/spapr: Allow fallback to SPAPR TCE IOMMU v1,
Alexey Kardashevskiy <=