* Ryan Harper <[EMAIL PROTECTED]> [2008-04-26 00:27]:
> There is a race between when the vcpu thread issues a create ioctl and when
> apic_reset() gets called resulting in getting a badfd error.
>
> main thread vcpu thread
guilt refresh clipped my text short.
main thread vcpu thread
----------- -----------
qemu/hw/pc.c:pc_new_cpu()
cpu_init()
cpu_x86_init()
kvm_init_new_ap() ap_main_loop()
*blocks*
usleep()
apic_init()
kvm_set_lapic()
kvm_ioctl with unitilized context
badfd
To fix this, ensure we create the vcpu in the vcpu thread before returning from
kvm_init_new_ap. Synchronize on a new mutux, vcpu_mutex, and wait for the
vcpuup condition before signaling to ensure the main thread is waiting before we
send the signal.
With this patch, I can launch 64 kvm guests, 1 second apart and not see any Bad
File descriptor errors.
Signed-off-by: Ryan Harper <[EMAIL PROTECTED]>
--
Ryan Harper
Software Engineer; Linux Technology Center
IBM Corp., Austin, Tx
(512) 838-9253 T/L: 678-9253
[EMAIL PROTECTED]
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