[Top][All Lists]
[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index]
Re: [Qemu-devel] [PATCH] don't call reset functions on cpu initializati
From: |
Laurent Desnogues |
Subject: |
Re: [Qemu-devel] [PATCH] don't call reset functions on cpu initialization |
Date: |
Tue, 3 Nov 2009 21:12:41 +0100 |
On Tue, Nov 3, 2009 at 8:50 PM, Glauber Costa <address@hidden> wrote:
> There is absolutely no need to call reset functions when initializing
> devices. Since we are already registering them, calling qemu_system_reset()
> should suffice. Actually, it is what happens when we reboot the machine,
> and using the same process instead of a special case semantics will even
> allow us to find bugs easier.
>
> Furthermore, the fact that we initialize things like the cpu quite early,
> leads to the need to introduce synchronization stuff like qemu_system_cond.
> This patch removes it entirely. All we need to do is call qemu_system_reset()
> only when we're already sure the system is up and running
>
> I tested it with qemu (with and without io-thread) and qemu-kvm, and it
> seems to be doing okay - although qemu-kvm uses a slightly different patch.
>
> Signed-off-by: Glauber Costa <address@hidden>
> ---
> hw/apic.c | 1 -
> hw/e1000.c | 1 -
> hw/hpet.c | 1 -
> hw/i8254.c | 2 --
> hw/ide/piix.c | 1 -
> hw/piix4.c | 1 -
> hw/piix_pci.c | 1 -
> hw/rtl8139.c | 2 +-
> hw/serial.c | 1 -
> hw/usb-ohci.c | 1 -
> hw/usb-uhci.c | 1 -
> hw/vga.c | 1 -
> target-i386/helper.c | 1 -
> vl.c | 15 +--------------
> 14 files changed, 2 insertions(+), 28 deletions(-)
[...]
> diff --git a/target-i386/helper.c b/target-i386/helper.c
> index c961544..957b3fc 100644
> --- a/target-i386/helper.c
> +++ b/target-i386/helper.c
> @@ -1885,7 +1885,6 @@ CPUX86State *cpu_x86_init(const char *cpu_model)
> return NULL;
> }
> mce_init(env);
> - cpu_reset(env);
Who will call cpu_reset for user mode QEMU then?
Laurent