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Re: [Qemu-devel] ppc emulation and interrupts
From: |
Blue Swirl |
Subject: |
Re: [Qemu-devel] ppc emulation and interrupts |
Date: |
Wed, 21 Jan 2009 19:01:42 +0200 |
On 1/21/09, Stefano Stabellini <address@hidden> wrote:
> Hi all,
> one of the recent problems, noticed after the displaystate change,
> affects ppc emulation only and is due to the fact that none on ppc
> emulation is issuing any interrupt request of the CPU_INTERRUPT_EXIT
> kind if the gui timer is disabled.
> Hence qemu never leaves the loop in cpu-exec.c:cpu_exec.
> If the gui timer is enabled qemu is able to leave the loop because the
> condition (interrupt_request & CPU_INTERRUPT_EXIT) is true when the
> timer is triggered.
> I think this is a problem with the ppc emulation but if you ppc guys
> need the gui timer to be always on, I can arrange for it to be.
> Regards,
It's not only PPC problem, Sparc64 with -nographic never exits cpu
loop because no timers are running. Serial input does not work,
because IO does not cause exit from cpu loop.
We could add a dummy timer just to exit the cpu loop, but that's a bit ugly.
I think SIGIO was discussed at some point, but rejected.
Would it be very hard to move to the IO thread model?