Hi,
This patch series addresses two aspects in vfio_spapr_create_window() that
includes the enhancement in error handling in this function and also fixes an
issue with KVM guests (L2) inside a pSeries logical partition (LPAR) with larger
memory configurations and PCI device passthrough.
The structure of the patch series is as below:
1. The first patch introduces structured error reporting in
`vfio_spapr_create_window()` by adding an `Error **` parameter. This allows
better propagation of failure details to the caller.
2. The second patch fixes a crash observed when booting an L2 KVM guest inside a
pSeries LPAR with memory more than 128 GB and PCI device passthrough. The
crash occurs due a check in KVM preventing multi-level TCEs because of not
being supported by PowerVM hypervisor. This patch ensures that such
configurations are avoided by first checking the supported number of levels
returned by the `VFIO_IOMMU_SPAPR_TCE_GET_INFO` ioctl.
The fix has been tested with KVM guests on PowerVM and bare-metal enviroments
with memory sizes up to 390 GB and 450 GB respectively.
Thanks,
Amit
Changes in v3:
* Change vfio_spapr_create_window() to return bool
* Replace error_setg() with error_setg_errono() in vfio_spapr_create_window()
* Pass errp instead of local Error object in vfio_spapr_create_window()
while calling from vfio_spapr_add_section_window()
* Modified patch #2 subject
Changes in v2:
* Link:
https://lore.kernel.org/all/20250407143119.1304513-1-amach...@linux.ibm.com/
* Added Error ** parameter in vfio_spapr_create_window() for enhanced error
handling with error_setg() and friends
v1: https://lore.kernel.org/all/20250404091721.2653539-1-amach...@linux.ibm.com/
Amit Machhiwal (2):
vfio/spapr: Enhance error handling in vfio_spapr_create_window()
vfio/spapr: Fix L2 crash with PCI device passthrough and memory > 128G
hw/vfio/spapr.c | 69 ++++++++++++++++++++++++++++++-------------------
1 file changed, 43 insertions(+), 26 deletions(-)
base-commit: dfaecc04c46d298e9ee81bd0ca96d8754f1c27ed
--
2.49.0
