KVM: arm64: Ignore EAGAIN for walks outside of a fault

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The page table walkers are invoked outside fault handling paths, such as
write protecting a range of memory. EAGAIN is generally used by the
walkers to retry execution due to races on a particular PTE, like taking
an access fault on a PTE being invalidated from another thread.

This early return behavior is undesirable for walkers that operate
outside a fault handler. Suppress EAGAIN and continue the walk if
operating outside a fault handler.

Link: https://lore.kernel.org/r/20221202185156.696189-3-oliver.upton@linux.dev
Signed-off-by: Oliver Upton <oliver.upton@linux.dev>

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This commit is contained in:

Oliver Upton 2022-12-02 18:51:52 +00:00

parent 9a7ad19ac8

commit ddcadb297c

3 changed files with 33 additions and 4 deletions

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3

arch/arm64/include/asm/kvm_pgtable.h

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30

arch/arm64/kvm/hyp/pgtable.c

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4

arch/arm64/kvm/mmu.c

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