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Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF
From: |
David Woodhouse |
Subject: |
Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM |
Date: |
Tue, 19 Feb 2013 18:35:03 +0000 |
On Tue, 2013-02-19 at 20:13 +0200, Gleb Natapov wrote:
>
> > I take it you mean copy 0xfffe0000 to 0xe0000? That would not be
> fun.
> > SeaBIOS would need to detect that it's in the state (it's definitely
> > not correct to do that on real-hardware or on "working" kvm
> > instances), then setup a trampoline somewhere outside of
> > 0xe0000-0xfffff to do the memcpy, jump to that trampoline, copy the
> > memory, restore segment registers, and then jump to 0xfffffff0.
> > That's a lot of kvm specific code to add to seabios as a workaround
> > and it seems fragile anyway.
> >
> Isn't this exactly what qemu_prep_reset() is doing now?
No. It doesn't do the trampoline thing because it doesn't *have* to;
it's copying an identical copy of the code back over itself.
--
dwmw2
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- Re: [Qemu-devel] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, (continued)
- Re: [Qemu-devel] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Laszlo Ersek, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Kevin O'Connor, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Laszlo Ersek, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Kevin O'Connor, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Kevin O'Connor, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM,
David Woodhouse <=
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Gleb Natapov, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/19
- Re: [Qemu-devel] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Paolo Bonzini, 2013/02/19
- Re: [Qemu-devel] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Laszlo Ersek, 2013/02/19
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, Kevin O'Connor, 2013/02/18
- Re: [Qemu-devel] [SeaBIOS] [edk2] (PAM stuff) reset doesn't work on OVMF + SeaBIOS CSM, David Woodhouse, 2013/02/18