On 05/22/2017 09:19 AM, Xiao Guangrong wrote:
On 05/20/2017 07:24 PM, Jan H. Schönherr wrote:
Intel SDM says, that at most one LAPIC should be configured with ExtINT
delivery. KVM configures all LAPICs this way. This causes pic_unlock()
to kick the first available vCPU from the internal KVM data structures.
If this vCPU is not the BSP, but some not-yet-booted AP, the BSP may
never realize that there is an interrupt.
Fix that by enabling ExtINT delivery only for the BSP.
This allows booting a Linux guest without a TSC in the above situation.
Otherwise the BSP gets stuck in calibrate_delay_converge().
Patch looks good to me.
BTW, what benefit do you want to get from notsc?
None. I just want my guest to boot in case it does that. :)
Regards
Jan
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