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authorLai Jiangshan <laijs@linux.alibaba.com>2021-08-14 11:51:29 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2021-09-06 06:32:35 -0400
commita40b2fd064bb7c0425c7cbdca2120cf0609a90a2 (patch)
tree61c680a35109089ed05a60335f7e4290e7291bd4 /arch
parent3cc4e148b96263313e3dce926eae569c942bb74e (diff)
x86/kvm: Don't enable IRQ when IRQ enabled in kvm_wait
Commit f4e61f0c9add3 ("x86/kvm: Fix broken irq restoration in kvm_wait") replaced "local_irq_restore() when IRQ enabled" with "local_irq_enable() when IRQ enabled" to suppress a warnning. Although there is no similar debugging warnning for doing local_irq_enable() when IRQ enabled as doing local_irq_restore() in the same IRQ situation. But doing local_irq_enable() when IRQ enabled is no less broken as doing local_irq_restore() and we'd better avoid it. Cc: Mark Rutland <mark.rutland@arm.com> Cc: Peter Zijlstra (Intel) <peterz@infradead.org> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> Message-Id: <20210814035129.154242-1-jiangshanlai@gmail.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch')
-rw-r--r--arch/x86/kernel/kvm.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
index a26643dc6bd6..b656456c3a94 100644
--- a/arch/x86/kernel/kvm.c
+++ b/arch/x86/kernel/kvm.c
@@ -884,10 +884,11 @@ static void kvm_wait(u8 *ptr, u8 val)
} else {
local_irq_disable();
+ /* safe_halt() will enable IRQ */
if (READ_ONCE(*ptr) == val)
safe_halt();
-
- local_irq_enable();
+ else
+ local_irq_enable();
}
}