On Fri, Nov 04, 2016 at 03:19:11AM -0600, Jan Beulich wrote:
> >>> On 29.10.16 at 10:59, <roger....@citrix.com> wrote:
> > --- a/xen/arch/x86/domain.c
> > +++ b/xen/arch/x86/domain.c
> > @@ -509,6 +509,27 @@ void vcpu_destroy(struct vcpu *v)
> > xfree(v->arch.pv_vcpu.trap_ctxt);
> > }
> >
> > +static bool emulation_flags_ok(const struct domain *d, uint32_t emflags)
> > +{
> > +
> > + if ( is_hvm_domain(d) )
> > + {
> > + if ( is_hardware_domain(d) &&
> > + emflags !=
> > (XEN_X86_EMU_PIT|XEN_X86_EMU_LAPIC|XEN_X86_EMU_IOAPIC) )
> > + return false;
>
> Why are hardware domains required to get all three?
The PIT is always enabled for hardware domains, although we might consider
disabling it for PVHv2 Dom0? TBH, I don't have a strong opinion here.
The local APIC and IO APIC are required in order to deliver interrupts from
physical devices (this is only for PVHv2 hardware domains).
Roger.
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