RISC-V: KVM: Report snapshot write failure to the guest

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If kvm_vcpu_write_guest() fails while updating the PMU snapshot area
on counter stop, the guest may receive SBI_SUCCESS without the
snapshot being updated, leaving stale data in shared memory.

Return SBI_ERR_FAILURE when the snapshot write fails.

Fixes: c2f41ddbcd ("RISC-V: KVM: Implement SBI PMU Snapshot feature")
Signed-off-by: SeungJu Cheon <suunj1331@gmail.com>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260825083719.643970-3-suunj1331@gmail.com
Signed-off-by: Anup Patel <anup@brainfault.org>

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SeungJu Cheon 2026-08-25 17:37:18 +09:00 • committed by Anup Patel

parent 8b3fd1a8b3

commit 057dd2639c

1 changed files with 4 additions and 3 deletions

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arch/riscv/kvm/vcpu_pmu.c

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