Preserve the negative return value from __vmx_handle_exit() when a bus lock is detected, instead of always overwriting it with 0. The purpose of bus_lock_detected handling is to force a userspace exit to inform userspace that a bus lock happened. The negative return value can achieve this purpose, and changing the negative value to 0 fails to return an error to userspace. So, preserve the negative return value. Fixes: fe6b6bc802b4 ("KVM: VMX: Enable bus lock VM exit") Cc: stable@vger.kernel.org Reported-by: sashiko-bot@kernel.org Closes: https://lore.kernel.org/all/20260805034602.5B2BB1F000E9@smtp.kernel.org/ Signed-off-by: Xiaoyao Li --- I'm not sure on the Closes: link, since Sashiko didn't find the VMX issue directly. Changes in v4 - grabbed from https://lore.kernel.org/all/20260806111923.1990562-2-xiaoyao.li@intel.com/ --- arch/x86/kvm/vmx/vmx.c | 5 +++-- 1 file changed, 3 insertions(+), 2 deletions(-) diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c index 35ac9ddffaf4..d302d0ce47f1 100644 --- a/arch/x86/kvm/vmx/vmx.c +++ b/arch/x86/kvm/vmx/vmx.c @@ -6860,11 +6860,12 @@ int vmx_handle_exit(struct kvm_vcpu *vcpu, fastpath_t exit_fastpath) * a bus lock in guest. */ if (vmx_get_exit_reason(vcpu).bus_lock_detected) { - if (ret > 0) + if (ret > 0) { vcpu->run->exit_reason = KVM_EXIT_X86_BUS_LOCK; + ret = 0; + } vcpu->run->flags |= KVM_RUN_X86_BUS_LOCK; - return 0; } return ret; } -- 2.43.0