[PULL 29/36] KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8

Alexander Graf
2014-01-29T16:13:27Z

From: Paul Mackerras <paulus@samba.org>

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>
---
arch/powerpc/include/asm/reg.h | 2 ++
arch/powerpc/kvm/book3s_hv.c | 6 ++++++
2 files changed, 8 insertions(+)

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 1248b40..05ecb07 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 1e9f4b45..d7f2ec6 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;

--
1.8.1.4