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Commit 6e0b8bc9 authored by Michael Ellerman's avatar Michael Ellerman Committed by Benjamin Herrenschmidt
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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: default avatarMichael Ellerman <michael@ellerman.id.au>
Signed-off-by: default avatarBenjamin Herrenschmidt <benh@kernel.crashing.org>
parent 4df48999

arch/powerpc/include/asm/lppaca.h

+2 −1
Original line number Diff line number Diff line
@@ -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;

arch/powerpc/platforms/pseries/lpar.c

+3 −0
Original line number Diff line number Diff line
@@ -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);