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KVM: riscv: Fix infinite loop in NACL hfence entry allocation

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try_count is initialized to 5 but never decremented in the retry path,
making the `if (try_count)` check always true. If all NACL shared memory
hfence entries remain in the pending state after sync, the function loops
forever, causing a soft lockup. Decrement try_count on each retry so the
fallback warning and return become reachable.

Fixes: d466c19cea ("RISC-V: KVM: Add common nested acceleration support")
Signed-off-by: Zongmin Zhou <zhouzongmin@kylinos.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20260716073756.44153-1-min_halo@163.com
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Zongmin Zhou 2026-07-16 15:37:56 +08:00 committed by Anup Patel
parent b7a4bd0c80
commit e971f19e4c
1 changed files with 1 additions and 1 deletions
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2
arch/riscv/kvm/nacl.c
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@ -33,7 +33,7 @@ void __kvm_riscv_nacl_hfence(void *shmem,
}
if (ent < 0) {
if (try_count) {
if (try_count--) {
nacl_sync_hfence(-1UL);
goto again;
} else {