[14/27] KVM: PPC: Magic Page BookE support

Commit Message

Alexander Graf July 1, 2010, 10:42 a.m. UTC

None

Patch

diff --git a/arch/powerpc/kvm/booke.c b/arch/powerpc/kvm/booke.c
index 0f8ff9d..9609207 100644
--- a/arch/powerpc/kvm/booke.c
+++ b/arch/powerpc/kvm/booke.c
@@ -244,6 +244,31 @@  void kvmppc_core_deliver_interrupts(struct kvm_vcpu *vcpu)
 		vcpu->arch.shared->int_pending = 0;
 }
 
+/* Check if a DTLB miss was on the magic page. Returns !0 if so. */
+int kvmppc_dtlb_magic_page(struct kvm_vcpu *vcpu, ulong eaddr)
+{
+	ulong mp_ea = vcpu->arch.magic_page_ea;
+	ulong gpaddr = vcpu->arch.magic_page_pa;
+	int gtlb_index = 11 | (1 << 16); /* Random number in TLB1 */
+
+	/* Check for existence of magic page */
+	if(likely(!mp_ea))
+		return 0;
+
+	/* Check if we're on the magic page */
+	if(likely((eaddr >> 12) != (mp_ea >> 12)))
+		return 0;
+
+	/* Don't map in user mode */
+	if(vcpu->arch.shared->msr & MSR_PR)
+		return 0;
+
+	kvmppc_mmu_map(vcpu, vcpu->arch.magic_page_ea, gpaddr, gtlb_index);
+	kvmppc_account_exit(vcpu, DTLB_VIRT_MISS_EXITS);
+
+	return 1;
+}
+
 /**
  * kvmppc_handle_exit
  *
@@ -311,6 +336,7 @@  int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 			r = RESUME_HOST;
 			break;
 		case EMULATE_FAIL:
+		case EMULATE_DO_MMIO:
 			/* XXX Deliver Program interrupt to guest. */
 			printk(KERN_CRIT "%s: emulation at %lx failed (%08x)\n",
 			       __func__, vcpu->arch.pc, vcpu->arch.last_inst);
@@ -380,6 +406,9 @@  int kvmppc_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu,
 		gpa_t gpaddr;
 		gfn_t gfn;
 
+		if (kvmppc_dtlb_magic_page(vcpu, eaddr))
+			break;
+
 		/* Check the guest TLB. */
 		gtlb_index = kvmppc_mmu_dtlb_index(vcpu, eaddr);
 		if (gtlb_index < 0) {
diff --git a/arch/powerpc/kvm/e500_tlb.c b/arch/powerpc/kvm/e500_tlb.c
index 66845a5..f5582ca 100644
--- a/arch/powerpc/kvm/e500_tlb.c
+++ b/arch/powerpc/kvm/e500_tlb.c
@@ -295,9 +295,22 @@  static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 	struct page *new_page;
 	struct tlbe *stlbe;
 	hpa_t hpaddr;
+	u32 mas2 = gtlbe->mas2;
+	u32 mas3 = gtlbe->mas3;
 
 	stlbe = &vcpu_e500->shadow_tlb[tlbsel][esel];
 
+	if ((vcpu_e500->vcpu.arch.magic_page_ea) &&
+	    ((vcpu_e500->vcpu.arch.magic_page_pa >> PAGE_SHIFT) == gfn) &&
+	    !(vcpu_e500->vcpu.arch.shared->msr & MSR_PR)) {
+		mas2 = 0;
+		mas3 = E500_TLB_SUPER_PERM_MASK;
+		hpaddr = virt_to_phys(vcpu_e500->vcpu.arch.shared);
+		new_page = pfn_to_page(hpaddr >> PAGE_SHIFT);
+		get_page(new_page);
+		goto mapped;
+	}
+
 	/* Get reference to new page. */
 	new_page = gfn_to_page(vcpu_e500->vcpu.kvm, gfn);
 	if (is_error_page(new_page)) {
@@ -305,6 +318,8 @@  static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 		kvm_release_page_clean(new_page);
 		return;
 	}
+
+mapped:
 	hpaddr = page_to_phys(new_page);
 
 	/* Drop reference to old page. */
@@ -316,10 +331,10 @@  static inline void kvmppc_e500_shadow_map(struct kvmppc_vcpu_e500 *vcpu_e500,
 	stlbe->mas1 = MAS1_TSIZE(BOOK3E_PAGESZ_4K)
 		| MAS1_TID(get_tlb_tid(gtlbe)) | MAS1_TS | MAS1_VALID;
 	stlbe->mas2 = (gvaddr & MAS2_EPN)
-		| e500_shadow_mas2_attrib(gtlbe->mas2,
+		| e500_shadow_mas2_attrib(mas2,
 				vcpu_e500->vcpu.arch.shared->msr & MSR_PR);
 	stlbe->mas3 = (hpaddr & MAS3_RPN)
-		| e500_shadow_mas3_attrib(gtlbe->mas3,
+		| e500_shadow_mas3_attrib(mas3,
 				vcpu_e500->vcpu.arch.shared->msr & MSR_PR);
 	stlbe->mas7 = (hpaddr >> 32) & MAS7_RPN;