On Mon, Feb 15, 2016 at 10:29:54AM +1100, David Gibson wrote:
> On Sat, Feb 13, 2016 at 05:28:24PM +0100, Andrew Jones wrote:
> > +bool hcall_have_broken_sc1(void)
> > +{
> > + register unsigned long r3 asm("r3") = H_SET_DABR;
> > + register unsigned long r4 asm("r4") = 0;
> > +
> > + asm volatile("sc 1"
> > + : "=r" (r3)
> > + : "r" (r3), "r" (r4)
> > + : "r5", "r6", "r7", "r8", "r9", "r10", "r11", "r12");
> > +
> > + return !(r3 == H_SUCCESS || r3 == (unsigned long)H_HARDWARE);
>
> It might be safer to explicitly check for H_PRIVILEGE, which is what
> you'll get in the case of a broken sc 1 under nested virtualization.
> That way you won't get false positives if H_SET_DABR ever gets any new
> error codes it can return.
Will do. Thanks. Should we consider a SLOF patch too? (As I stole this
condition from there, see check_broken_sc1 in lib/libhvcall/brokensc1.c)
Thanks,
drew
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