ppc: Better figure out if processor has HV mode
We use an env. flag which is set to the initial value of MSR_HVB in the msr_mask. We also adjust the POWER8 mask to set SHV. Also use this to adjust ctx.hv so that it is *set* when the processor doesn't have an HV mode (970 with Apple mode for example), thus enabling hypervisor instructions/SPRs. Signed-off-by: NBenjamin Herrenschmidt <benh@kernel.crashing.org> Reviewed-by: NDavid Gibson <david@gibson.dropbear.id.au> [clg: ctx.hv used to be defined only for the hypervisor kernel (HV=1|PR=0). It is now defined also when PR=1 and conditions are fixed accordingly. stripped unwanted tabs.] Signed-off-by: NCédric Le Goater <clg@kaod.org> Signed-off-by: NDavid Gibson <david@gibson.dropbear.id.au>
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