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powerpc/pseries: Inform the hypervisor we are using EBB regs

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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>
This commit is contained in:
Michael Ellerman 2013-06-28 18:15:18 +10:00 committed by Benjamin Herrenschmidt
parent 4df4899911
commit 6e0b8bc965
2 changed files with 5 additions and 1 deletions
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3
arch/powerpc/include/asm/lppaca.h
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@ -66,7 +66,8 @@ struct lppaca {
u8 reserved6[48];
u8 cede_latency_hint;
u8 reserved7[7];
u8 ebb_regs_in_use;
u8 reserved7[6];
u8 dtl_enable_mask; /* Dispatch Trace Log mask */
u8 donate_dedicated_cpu; /* Donate dedicated CPU cycles */
u8 fpregs_in_use;

3
arch/powerpc/platforms/pseries/lpar.c
View file

@ -71,6 +71,9 @@ void vpa_init(int cpu)
if (cpu_has_feature(CPU_FTR_ALTIVEC))
lppaca_of(cpu).vmxregs_in_use = 1;
if (cpu_has_feature(CPU_FTR_ARCH_207S))
lppaca_of(cpu).ebb_regs_in_use = 1;
addr = __pa(&lppaca_of(cpu));
ret = register_vpa(hwcpu, addr);