KVM: arm64: Mark the page dirty only if the fault is handled successfully

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We now set the pfn dirty and mark the page dirty before calling fault
handlers in user_mem_abort(), so we might end up having spurious dirty
pages if update of permissions or mapping has failed. Let's move these
two operations after the fault handlers, and they will be done only if
the fault has been handled successfully.

When an -EAGAIN errno is returned from the map handler, we hope to the
vcpu to enter guest directly instead of exiting back to userspace, so
adjust the return value at the end of function.

Signed-off-by: Yanan Wang <wangyanan55@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Link: https://lore.kernel.org/r/20210114121350.123684-4-wangyanan55@huawei.com

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Yanan Wang 2021-01-14 20:13:50 +08:00 • committed by Marc Zyngier

parent 694d071f8d

commit 509552e65a

1 changed files with 8 additions and 5 deletions

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arch/arm64/kvm/mmu.c

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