[9/9] KVM: PPC: Enable native paired singles

Commit Message

Alexander Graf April 20, 2010, 12:49 a.m. UTC

None

Patch

diff --git a/arch/powerpc/include/asm/kvm_asm.h b/arch/powerpc/include/asm/kvm_asm.h
index 7238c04..c5ea4cd 100644
--- a/arch/powerpc/include/asm/kvm_asm.h
+++ b/arch/powerpc/include/asm/kvm_asm.h
@@ -89,6 +89,7 @@ 
 #define BOOK3S_HFLAG_DCBZ32			0x1
 #define BOOK3S_HFLAG_SLB			0x2
 #define BOOK3S_HFLAG_PAIRED_SINGLE		0x4
+#define BOOK3S_HFLAG_NATIVE_PS			0x8
 
 #define RESUME_FLAG_NV          (1<<0)  /* Reload guest nonvolatile state? */
 #define RESUME_FLAG_HOST        (1<<1)  /* Resume host? */
diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index 91dc42d..cfc3051 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -344,6 +344,8 @@  void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 
 void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 {
+	u32 host_pvr;
+
 	vcpu->arch.hflags &= ~BOOK3S_HFLAG_SLB;
 	vcpu->arch.pvr = pvr;
 #ifdef CONFIG_PPC_BOOK3S_64
@@ -375,6 +377,23 @@  void kvmppc_set_pvr(struct kvm_vcpu *vcpu, u32 pvr)
 	/* 32 bit Book3S always has 32 byte dcbz */
 	vcpu->arch.hflags |= BOOK3S_HFLAG_DCBZ32;
 #endif
+
+	/* On some CPUs we can execute paired single operations natively */
+	asm ( "mfpvr %0" : "=r"(host_pvr));
+	switch (host_pvr) {
+	case 0x00080200:	/* lonestar 2.0 */
+	case 0x00088202:	/* lonestar 2.2 */
+	case 0x70000100:	/* gekko 1.0 */
+	case 0x00080100:	/* gekko 2.0 */
+	case 0x00083203:	/* gekko 2.3a */
+	case 0x00083213:	/* gekko 2.3b */
+	case 0x00083204:	/* gekko 2.4 */
+	case 0x00083214:	/* gekko 2.4e (8SE) - retail HW2 */
+	case 0x00087200:	/* broadway */
+		vcpu->arch.hflags |= BOOK3S_HFLAG_NATIVE_PS;
+		/* Enable HID2.PSE - in case we need it later */
+		mtspr(SPRN_HID2_GEKKO, mfspr(SPRN_HID2_GEKKO) | (1 << 29));
+	}
 }
 
 /* Book3s_32 CPUs always have 32 bytes cache line size, which Linux assumes. To
diff --git a/arch/powerpc/kvm/book3s_emulate.c b/arch/powerpc/kvm/book3s_emulate.c
index 3f7afb5..c85f906 100644
--- a/arch/powerpc/kvm/book3s_emulate.c
+++ b/arch/powerpc/kvm/book3s_emulate.c
@@ -365,7 +365,10 @@  int kvmppc_core_emulate_mtspr(struct kvm_vcpu *vcpu, int sprn, int rs)
 		case 0x00083213:	/* gekko 2.3b */
 		case 0x00083204:	/* gekko 2.4 */
 		case 0x00083214:	/* gekko 2.4e (8SE) - retail HW2 */
-			if (spr_val & (1 << 29)) { /* HID2.PSE */
+		case 0x00087200:	/* broadway */
+			if (vcpu->arch.hflags & BOOK3S_HFLAG_NATIVE_PS) {
+				/* Native paired singles */
+			} else if (spr_val & (1 << 29)) { /* HID2.PSE */
 				vcpu->arch.hflags |= BOOK3S_HFLAG_PAIRED_SINGLE;
 				kvmppc_giveup_ext(vcpu, MSR_FP);
 			} else {