RISC-V: KVM: Release unused page after MMU invalidation

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If an MMU invalidation races with a G-stage fault, the fault handler skips
installing the page but leaves ret set to zero. As a result,
kvm_release_faultin_page() treats the page as used and can unnecessarily
mark it dirty.

Track the invalidation retry separately and release the page as unused,
while preserving the existing return value so that the vCPU retries the
fault.

Fixes: 2ed90cb093 ("KVM: RISC-V: Retry fault if vma_lookup() results become invalid")
Cc: stable@vger.kernel.org
Signed-off-by: Xie Bo <xb@ultrarisc.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260810051544.3953925-2-xb@ultrarisc.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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Xie Bo 2026-08-10 13:15:43 +08:00 • committed by Anup Patel

parent 8ae12ccaec

commit ed54fdb460

1 changed files with 6 additions and 2 deletions

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arch/riscv/kvm/mmu.c

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