KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8

POWER8 has a bit in the LPCR to enable or disable the PURR and SPURR
registers to count when in the guest.  Set this bit.

POWER8 has a field in the LPCR called AIL (Alternate Interrupt Location)
which is used to enable relocation-on interrupts.  Allow userspace to
set this field.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

2 files changed, 8 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1248b40107ea..05ecb072540c 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -305,8 +305,10 @@
 #define   LPCR_RMLS    0x1C000000      /* impl dependent rmo limit sel */
 #define   LPCR_RMLS_SH  (63-37)
 #define   LPCR_ILE     0x02000000      /* !HV irqs set MSR:LE */
+#define   LPCR_AIL      0x01800000      /* Alternate interrupt location */
 #define   LPCR_AIL_0    0x00000000      /* MMU off exception offset 0x0 */
 #define   LPCR_AIL_3    0x01800000      /* MMU on exception offset 0xc00...4xxx */
+#define   LPCR_ONL      0x00040000      /* online - PURR/SPURR count */
 #define   LPCR_PECE     0x0001f000      /* powersave exit cause enable */
 #define     LPCR_PECEDP 0x00010000      /* directed priv dbells cause exit */
 #define     LPCR_PECEDH 0x00008000      /* directed hyp dbells cause exit */
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c
index 1e9f4b45432b..d7f2ec6f1419 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -789,8 +789,11 @@ static void kvmppc_set_lpcr(struct kvm_vcpu *vcpu, u64 new_lpcr)
         /*
          * Userspace can only modify DPFD (default prefetch depth),
          * ILE (interrupt little-endian) and TC (translation control).
+         * On POWER8 userspace can also modify AIL (alt. interrupt loc.)
          */
         mask = LPCR_DPFD | LPCR_ILE | LPCR_TC;
+        if (cpu_has_feature(CPU_FTR_ARCH_207S))
+                mask |= LPCR_AIL;
         vc->lpcr = (vc->lpcr & ~mask) | (new_lpcr & mask);
         spin_unlock(&vc->lock);
 }
@@ -2166,6 +2169,9 @@ static int kvmppc_core_init_vm_hv(struct kvm *kvm)
                         LPCR_VPM0 | LPCR_VPM1;
                 kvm->arch.vrma_slb_v = SLB_VSID_B_1T |
                         (VRMA_VSID << SLB_VSID_SHIFT_1T);
+                /* On POWER8 turn on online bit to enable PURR/SPURR */
+                if (cpu_has_feature(CPU_FTR_ARCH_207S))
+                        lpcr |= LPCR_ONL;
         }
         kvm->arch.lpcr = lpcr;