x86: vMCE injection

x86: vMCE injection

In our test for win8 guest mce, we find a bug that no matter what
SRAO/SRAR error xen inject to win8 guest, it always reboot.

The root cause is, current Xen vMCE logic inject vMCE# only to vcpu0,
this is not correct for Intel MCE (Under Intel arch, h/w generate MCE#
to all CPUs).

This patch fixes vMCE injection bug, injecting vMCE# to all vcpus on
Intel platforms.

Signed-off-by: Liu, Jinsong <jinsong.liu@intel.com>
- increase flexibility be making new second argument of inject_vmce() a
  VCPU ID rather than just a boolean

Acked-by: Christoph Egger <Christoph.Egger@amd.com> (on just this change)
- fix condition evaluation order in inject_vmce()

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Committed-by: Jan Beulich <jbeulich@suse.com>