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| author | Alexey Kardashevskiy <aik@ozlabs.ru> | 2018-12-19 09:52:29 +0100 |
|---|---|---|
| committer | Michael Ellerman <mpe@ellerman.id.au> | 2018-12-21 06:20:46 +0100 |
| commit | 58629c0dc34904d135af944d120eb23165ec3b61 (patch) | |
| tree | c6e96ae78213fc95c6f7181047ee68210d6440d1 /drivers/vfio/pci/vfio_pci.c | |
| parent | powerpc/powernv/npu: Check mmio_atsd array bounds when populating (diff) | |
| download | linux-58629c0dc34904d135af944d120eb23165ec3b61.tar.xz linux-58629c0dc34904d135af944d120eb23165ec3b61.zip | |
powerpc/powernv/npu: Fault user page into the hypervisor's pagetable
When a page fault happens in a GPU, the GPU signals the OS and the GPU
driver calls the fault handler which populated a page table; this allows
the GPU to complete an ATS request.
On the bare metal get_user_pages() is enough as it adds a pte to
the kernel page table but under KVM the partition scope tree does not get
updated so ATS will still fail.
This reads a byte from an effective address which causes HV storage
interrupt and KVM updates the partition scope tree.
Signed-off-by: Alexey Kardashevskiy <aik@ozlabs.ru>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Diffstat (limited to 'drivers/vfio/pci/vfio_pci.c')
0 files changed, 0 insertions, 0 deletions