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>

diff --git a/arch/powerpc/include/asm/lppaca.h b/arch/powerpc/include/asm/lppaca.h
index b1e7f2af1016c82e6584731a0d0112b80a5eb277..9b12f88d4adb4f0977c46bedf2f555b055f71955 100644 (file)
--- a/arch/powerpc/include/asm/lppaca.h
+++ b/arch/powerpc/include/asm/lppaca.h
@@ -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;

diff --git a/arch/powerpc/platforms/pseries/lpar.c b/arch/powerpc/platforms/pseries/lpar.c
index fd0f2f2a9b900d22c2db7dab8ea648140b0fe2d3..02d6e21619bb6c677771c0dc6ecaabb5e1d417d5 100644 (file)
--- a/arch/powerpc/platforms/pseries/lpar.c
+++ b/arch/powerpc/platforms/pseries/lpar.c
@@ -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);