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Diffstat (limited to 'arch/powerpc/kvm/e500_mmu_host.c')
-rw-r--r--arch/powerpc/kvm/e500_mmu_host.c102
1 files changed, 102 insertions, 0 deletions
diff --git a/arch/powerpc/kvm/e500_mmu_host.c b/arch/powerpc/kvm/e500_mmu_host.c
index 86903d3f5a03..08f14bb57897 100644
--- a/arch/powerpc/kvm/e500_mmu_host.c
+++ b/arch/powerpc/kvm/e500_mmu_host.c
@@ -107,11 +107,15 @@ static u32 get_host_mas0(unsigned long eaddr)
{
unsigned long flags;
u32 mas0;
+ u32 mas4;
local_irq_save(flags);
mtspr(SPRN_MAS6, 0);
+ mas4 = mfspr(SPRN_MAS4);
+ mtspr(SPRN_MAS4, mas4 & ~MAS4_TLBSEL_MASK);
asm volatile("tlbsx 0, %0" : : "b" (eaddr & ~CONFIG_PAGE_OFFSET));
mas0 = mfspr(SPRN_MAS0);
+ mtspr(SPRN_MAS4, mas4);
local_irq_restore(flags);
return mas0;
@@ -607,6 +611,104 @@ void kvmppc_mmu_map(struct kvm_vcpu *vcpu, u64 eaddr, gpa_t gpaddr,
}
}
+#ifdef CONFIG_KVM_BOOKE_HV
+int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,
+ u32 *instr)
+{
+ gva_t geaddr;
+ hpa_t addr;
+ hfn_t pfn;
+ hva_t eaddr;
+ u32 mas1, mas2, mas3;
+ u64 mas7_mas3;
+ struct page *page;
+ unsigned int addr_space, psize_shift;
+ bool pr;
+ unsigned long flags;
+
+ /* Search TLB for guest pc to get the real address */
+ geaddr = kvmppc_get_pc(vcpu);
+
+ addr_space = (vcpu->arch.shared->msr & MSR_IS) >> MSR_IR_LG;
+
+ local_irq_save(flags);
+ mtspr(SPRN_MAS6, (vcpu->arch.pid << MAS6_SPID_SHIFT) | addr_space);
+ mtspr(SPRN_MAS5, MAS5_SGS | vcpu->kvm->arch.lpid);
+ asm volatile("tlbsx 0, %[geaddr]\n" : :
+ [geaddr] "r" (geaddr));
+ mtspr(SPRN_MAS5, 0);
+ mtspr(SPRN_MAS8, 0);
+ mas1 = mfspr(SPRN_MAS1);
+ mas2 = mfspr(SPRN_MAS2);
+ mas3 = mfspr(SPRN_MAS3);
+#ifdef CONFIG_64BIT
+ mas7_mas3 = mfspr(SPRN_MAS7_MAS3);
+#else
+ mas7_mas3 = ((u64)mfspr(SPRN_MAS7) << 32) | mas3;
+#endif
+ local_irq_restore(flags);
+
+ /*
+ * If the TLB entry for guest pc was evicted, return to the guest.
+ * There are high chances to find a valid TLB entry next time.
+ */
+ if (!(mas1 & MAS1_VALID))
+ return EMULATE_AGAIN;
+
+ /*
+ * Another thread may rewrite the TLB entry in parallel, don't
+ * execute from the address if the execute permission is not set
+ */
+ pr = vcpu->arch.shared->msr & MSR_PR;
+ if (unlikely((pr && !(mas3 & MAS3_UX)) ||
+ (!pr && !(mas3 & MAS3_SX)))) {
+ pr_err_ratelimited(
+ "%s: Instuction emulation from guest addres %08lx without execute permission\n",
+ __func__, geaddr);
+ return EMULATE_AGAIN;
+ }
+
+ /*
+ * The real address will be mapped by a cacheable, memory coherent,
+ * write-back page. Check for mismatches when LRAT is used.
+ */
+ if (has_feature(vcpu, VCPU_FTR_MMU_V2) &&
+ unlikely((mas2 & MAS2_I) || (mas2 & MAS2_W) || !(mas2 & MAS2_M))) {
+ pr_err_ratelimited(
+ "%s: Instuction emulation from guest addres %08lx mismatches storage attributes\n",
+ __func__, geaddr);
+ return EMULATE_AGAIN;
+ }
+
+ /* Get pfn */
+ psize_shift = MAS1_GET_TSIZE(mas1) + 10;
+ addr = (mas7_mas3 & (~0ULL << psize_shift)) |
+ (geaddr & ((1ULL << psize_shift) - 1ULL));
+ pfn = addr >> PAGE_SHIFT;
+
+ /* Guard against emulation from devices area */
+ if (unlikely(!page_is_ram(pfn))) {
+ pr_err_ratelimited("%s: Instruction emulation from non-RAM host addres %08llx is not supported\n",
+ __func__, addr);
+ return EMULATE_AGAIN;
+ }
+
+ /* Map a page and get guest's instruction */
+ page = pfn_to_page(pfn);
+ eaddr = (unsigned long)kmap_atomic(page);
+ *instr = *(u32 *)(eaddr | (unsigned long)(addr & ~PAGE_MASK));
+ kunmap_atomic((u32 *)eaddr);
+
+ return EMULATE_DONE;
+}
+#else
+int kvmppc_load_last_inst(struct kvm_vcpu *vcpu, enum instruction_type type,
+ u32 *instr)
+{
+ return EMULATE_AGAIN;
+}
+#endif
+
/************* MMU Notifiers *************/
int kvm_unmap_hva(struct kvm *kvm, unsigned long hva)