On Mon, Dec 21, 2015 at 09:41:32AM +0000, Gonglei (Arei) wrote:
> When the gurb of OS is booting, then the softirq and C function send_disk_op()
> may use extra stack of SeaBIOS. If we inject a NMI, romlayout.S:
> irqentry_extrastack
> is invoked, and the extra stack will be used again. And the stack of first
> calling
> will be broken, so that the SeaBIOS stuck.
>
> You can easily reproduce the problem.
>
> 1. start on guest
> 2. reset the guest
> 3. inject a NMI when the guest show the grub surface
> 4. then the guest stuck
Does the SeaBIOS patch below help? I'm not familiar with how to
"inject a NMI" - can you describe the process in more detail?
-Kevin
--- a/src/romlayout.S
+++ b/src/romlayout.S
@@ -548,7 +548,9 @@ entry_post:
ENTRY_INTO32 _cfunc32flat_handle_post // Normal entry point
ORG 0xe2c3
- IRQ_ENTRY 02
+ .global entry_02
+entry_02:
+ ENTRY handle_02 // NMI handler does not switch onto extra stack
ORG 0xe3fe
.global entry_13_official
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