powerpc/pseries: Inform the hypervisor we are using EBB regs
On LPAR systems we need to inform the hypervisor that we are using the EBB registers. We do this by setting a bit in the Virtual Processor Area (VPA) - formerly known as the lppaca. For now we do this always, ie. we do not dynamically enable/disable. Signed-off-by: Michael Ellerman <michael@ellerman.id.au> Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
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@ -66,7 +66,8 @@ struct lppaca {
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u8 reserved6[48];
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u8 cede_latency_hint;
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u8 reserved7[7];
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u8 ebb_regs_in_use;
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u8 reserved7[6];
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u8 dtl_enable_mask; /* Dispatch Trace Log mask */
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u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
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u8 fpregs_in_use;
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@ -71,6 +71,9 @@ void vpa_init(int cpu)
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if (cpu_has_feature(CPU_FTR_ALTIVEC))
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lppaca_of(cpu).vmxregs_in_use = 1;
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if (cpu_has_feature(CPU_FTR_ARCH_207S))
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lppaca_of(cpu).ebb_regs_in_use = 1;
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addr = __pa(&lppaca_of(cpu));
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ret = register_vpa(hwcpu, addr);
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