[ipxe-devel] [PATCH 2/2] [build] Disable TIVOLI_VMM_WORKAROUND in the qemu configuration

[Ján ONDREJ (SAL)]

Hello,

  I have troubles with this FXSAVE/FXRSTOR not only on qemu/kvm,
but with some older hardware too (HP server).

  Maybe this tivoli workaround should be disabled for all and enabled
only for tivoli.

							SAL

On Thu, Oct 27, 2016 at 12:13:51AM +0200, Laszlo Ersek wrote:
> This prevents KVM guests from crashing that run iPXE on host CPUs without
> "unrestricted_guest" support.
> 
> Once KVM gets the FXSAVE / FXRSTOR emulation feature (*), and the feature
> becomes widely available to users, we can back out this change from iPXE.
> 
> (*) Already in progress by Radim:
> 
>     [PATCH 0/2] KVM: x86: emulate fxsave and fxrstor
> 
>     https://www.mail-archive.com/linux-kernel@vger.kernel.org/msg1258895.html
>     https://www.spinics.net/lists/kernel/msg2370327.html
> 
> Cc: Bandan Das <bsd at redhat.com>
> Cc: Gerd Hoffmann <kraxel at redhat.com>
> Cc: Greg <rollenwiese at yahoo.com>
> Cc: Michael Brown <mcb30 at ipxe.org>
> Cc: Michael Prokop <launchpad at michael-prokop.at>
> Cc: Paolo Bonzini <pbonzini at redhat.com>
> Cc: Peter Pickford <arch at netremedies.ca>
> Cc: Radim Krčmář <rkrcmar at redhat.com>
> Ref: https://bugs.archlinux.org/task/50778
> Ref: https://bugs.launchpad.net/qemu/+bug/1623276
> Ref: https://bugzilla.proxmox.com/show_bug.cgi?id=1182
> Ref: https://bugzilla.redhat.com/show_bug.cgi?id=1356762
> Signed-off-by: Laszlo Ersek <lersek at redhat.com>
> ---
>  src/config/qemu/general.h | 5 +++++
>  1 file changed, 5 insertions(+)
> 
> diff --git a/src/config/qemu/general.h b/src/config/qemu/general.h
> index 30f60d3f704a..a084497359fe 100644
> --- a/src/config/qemu/general.h
> +++ b/src/config/qemu/general.h
> @@ -8,3 +8,8 @@
>  
>  /* Work around missing EFI_PXE_BASE_CODE_PROTOCOL */
>  #define EFI_DOWNGRADE_UX
> +
> +/* The Tivoli VMM workaround causes a KVM emulation failure on hosts
> + * without unrestricted_guest support
> + */
> +#undef TIVOLI_VMM_WORKAROUND
> -- 
> 2.9.2
> 
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