On Mon, Oct 03, 2016 at 05:42:36PM +0100, Daniel P. Berrange wrote:
> On Tue, Sep 27, 2016 at 05:12:24PM -0300, Eduardo Habkost wrote:
> > This will reuse the existing check/enforce logic in
> > x86_cpu_filter_features() to check the xsave component bits
> > against GET_SUPPORTED_CPUID.
> >
> > Reviewed-by: Richard Henderson <[email protected]>
> > Signed-off-by: Eduardo Habkost <[email protected]>
> > ---
> > target-i386/cpu.c | 42 ++++++++++++++++++++++++++++--------------
> > target-i386/cpu.h | 3 ++-
> > 2 files changed, 30 insertions(+), 15 deletions(-)
>
> git bisect tells me that this change is responsible for breaking booting
> of a guest of mine which uses -cpu host
>
> GRUB works, but the guest kernel hangs immediately after printing
>
> "Probing EDD (edd=off to disable)... ok"
>
> Removing '-cpu host' lets it work again.
[...]
> In case its relevant, QEMU prints this to stderr:
>
> warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 0]
> warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 1]
> warning: host doesn't support requested feature: CPUID.0DH:EAX [bit 2]
This was reported by Wanpeng Li last week. The fix ("target-i386:
Report known CPUID[EAX=0xD,ECX=0]:EAX bits as migratable") is in
the pull request I sent today.
You can also work around it by using "-cpu host,migratable=off".
--
Eduardo
