From e971f19e4c821906db17b4f67747bbce62bf7bf9 Mon Sep 17 00:00:00 2001 From: Zongmin Zhou Date: Thu, 16 Jul 2026 15:37:56 +0800 Subject: [PATCH] KVM: riscv: Fix infinite loop in NACL hfence entry allocation 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: d466c19cead5 ("RISC-V: KVM: Add common nested acceleration support") Signed-off-by: Zongmin Zhou Reviewed-by: Anup Patel Link: https://lore.kernel.org/r/20260716073756.44153-1-min_halo@163.com Signed-off-by: Anup Patel --- arch/riscv/kvm/nacl.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/arch/riscv/kvm/nacl.c b/arch/riscv/kvm/nacl.c index 6f9f8963e9dd..9aff03c4f667 100644 --- a/arch/riscv/kvm/nacl.c +++ b/arch/riscv/kvm/nacl.c @@ -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 {