Patchwork [09/15] KVM: PPC: Book3S HV: Handle new LPCR bits on POWER8

login
register
mail settings
Submitter Paul Mackerras
Date Nov. 9, 2013, 11:04 a.m.
Message ID <1383995103-24732-10-git-send-email-paulus@samba.org>
Download mbox | patch
Permalink /patch/289978/
State New
Headers show

Comments

Paul Mackerras - Nov. 9, 2013, 11:04 a.m.
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>
---
 arch/powerpc/include/asm/reg.h | 2 ++
 arch/powerpc/kvm/book3s_hv.c   | 6 ++++++
 2 files changed, 8 insertions(+)

Patch

diff --git a/arch/powerpc/include/asm/reg.h b/arch/powerpc/include/asm/reg.h
index 8c6b278..e86b008 100644
--- a/arch/powerpc/include/asm/reg.h
+++ b/arch/powerpc/include/asm/reg.h
@@ -300,8 +300,10 @@ 
 #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 7ffa115..09de011 100644
--- a/arch/powerpc/kvm/book3s_hv.c
+++ b/arch/powerpc/kvm/book3s_hv.c
@@ -787,8 +787,11 @@  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);
 }
@@ -2207,6 +2210,9 @@  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;