1 files changed, 258 insertions, 0 deletions

diff --git a/arch/powerpc/kvm/book3s_64_mmu_hv.c b/arch/powerpc/kvm/book3s_64_mmu_hv.c
new file mode 100644
index 000000000000..4a4fbec61a17
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -0,0 +1,258 @@
+/*
+ * This program is free software; you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License, version 2, as
+ * published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
+ *
+ * Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
+ */
+
+#include <linux/types.h>
+#include <linux/string.h>
+#include <linux/kvm.h>
+#include <linux/kvm_host.h>
+#include <linux/highmem.h>
+#include <linux/gfp.h>
+#include <linux/slab.h>
+#include <linux/hugetlb.h>
+
+#include <asm/tlbflush.h>
+#include <asm/kvm_ppc.h>
+#include <asm/kvm_book3s.h>
+#include <asm/mmu-hash64.h>
+#include <asm/hvcall.h>
+#include <asm/synch.h>
+#include <asm/ppc-opcode.h>
+#include <asm/cputable.h>
+
+/* For now use fixed-size 16MB page table */
+#define HPT_ORDER       24
+#define HPT_NPTEG       (1ul << (HPT_ORDER - 7))        /* 128B per pteg */
+#define HPT_HASH_MASK   (HPT_NPTEG - 1)
+
+/* Pages in the VRMA are 16MB pages */
+#define VRMA_PAGE_ORDER 24
+#define VRMA_VSID       0x1ffffffUL     /* 1TB VSID reserved for VRMA */
+
+#define NR_LPIDS        (LPID_RSVD + 1)
+unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
+
+long kvmppc_alloc_hpt(struct kvm *kvm)
+{
+        unsigned long hpt;
+        unsigned long lpid;
+
+        hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
+                               HPT_ORDER - PAGE_SHIFT);
+        if (!hpt) {
+                pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
+                return -ENOMEM;
+        }
+        kvm->arch.hpt_virt = hpt;
+
+        do {
+                lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
+                if (lpid >= NR_LPIDS) {
+                        pr_err("kvm_alloc_hpt: No LPIDs free\n");
+                        free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
+                        return -ENOMEM;
+                }
+        } while (test_and_set_bit(lpid, lpid_inuse));
+
+        kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
+        kvm->arch.lpid = lpid;
+        kvm->arch.host_sdr1 = mfspr(SPRN_SDR1);
+        kvm->arch.host_lpid = mfspr(SPRN_LPID);
+        kvm->arch.host_lpcr = mfspr(SPRN_LPCR);
+
+        pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
+        return 0;
+}
+
+void kvmppc_free_hpt(struct kvm *kvm)
+{
+        unsigned long i;
+        struct kvmppc_pginfo *pginfo;
+
+        clear_bit(kvm->arch.lpid, lpid_inuse);
+        free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
+
+        if (kvm->arch.ram_pginfo) {
+                pginfo = kvm->arch.ram_pginfo;
+                kvm->arch.ram_pginfo = NULL;
+                for (i = 0; i < kvm->arch.ram_npages; ++i)
+                        put_page(pfn_to_page(pginfo[i].pfn));
+                kfree(pginfo);
+        }
+}
+
+static unsigned long user_page_size(unsigned long addr)
+{
+        struct vm_area_struct *vma;
+        unsigned long size = PAGE_SIZE;
+
+        down_read(&current->mm->mmap_sem);
+        vma = find_vma(current->mm, addr);
+        if (vma)
+                size = vma_kernel_pagesize(vma);
+        up_read(&current->mm->mmap_sem);
+        return size;
+}
+
+static pfn_t hva_to_pfn(unsigned long addr)
+{
+        struct page *page[1];
+        int npages;
+
+        might_sleep();
+
+        npages = get_user_pages_fast(addr, 1, 1, page);
+
+        if (unlikely(npages != 1))
+                return 0;
+
+        return page_to_pfn(page[0]);
+}
+
+long kvmppc_prepare_vrma(struct kvm *kvm,
+                         struct kvm_userspace_memory_region *mem)
+{
+        unsigned long psize, porder;
+        unsigned long i, npages;
+        struct kvmppc_pginfo *pginfo;
+        pfn_t pfn;
+        unsigned long hva;
+
+        /* First see what page size we have */
+        psize = user_page_size(mem->userspace_addr);
+        /* For now, only allow 16MB pages */
+        if (psize != 1ul << VRMA_PAGE_ORDER || (mem->memory_size & (psize - 1))) {
+                pr_err("bad psize=%lx memory_size=%llx @ %llx\n",
+                       psize, mem->memory_size, mem->userspace_addr);
+                return -EINVAL;
+        }
+        porder = __ilog2(psize);
+
+        npages = mem->memory_size >> porder;
+        pginfo = kzalloc(npages * sizeof(struct kvmppc_pginfo), GFP_KERNEL);
+        if (!pginfo) {
+                pr_err("kvmppc_prepare_vrma: couldn't alloc %lu bytes\n",
+                       npages * sizeof(struct kvmppc_pginfo));
+                return -ENOMEM;
+        }
+
+        for (i = 0; i < npages; ++i) {
+                hva = mem->userspace_addr + (i << porder);
+                if (user_page_size(hva) != psize)
+                        goto err;
+                pfn = hva_to_pfn(hva);
+                if (pfn == 0) {
+                        pr_err("oops, no pfn for hva %lx\n", hva);
+                        goto err;
+                }
+                if (pfn & ((1ul << (porder - PAGE_SHIFT)) - 1)) {
+                        pr_err("oops, unaligned pfn %llx\n", pfn);
+                        put_page(pfn_to_page(pfn));
+                        goto err;
+                }
+                pginfo[i].pfn = pfn;
+        }
+
+        kvm->arch.ram_npages = npages;
+        kvm->arch.ram_psize = psize;
+        kvm->arch.ram_porder = porder;
+        kvm->arch.ram_pginfo = pginfo;
+
+        return 0;
+
+ err:
+        kfree(pginfo);
+        return -EINVAL;
+}
+
+void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
+{
+        unsigned long i;
+        unsigned long npages = kvm->arch.ram_npages;
+        unsigned long pfn;
+        unsigned long *hpte;
+        unsigned long hash;
+        struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo;
+
+        if (!pginfo)
+                return;
+
+        /* VRMA can't be > 1TB */
+        if (npages > 1ul << (40 - kvm->arch.ram_porder))
+                npages = 1ul << (40 - kvm->arch.ram_porder);
+        /* Can't use more than 1 HPTE per HPTEG */
+        if (npages > HPT_NPTEG)
+                npages = HPT_NPTEG;
+
+        for (i = 0; i < npages; ++i) {
+                pfn = pginfo[i].pfn;
+                /* can't use hpt_hash since va > 64 bits */
+                hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
+                /*
+                 * We assume that the hash table is empty and no
+                 * vcpus are using it at this stage.  Since we create
+                 * at most one HPTE per HPTEG, we just assume entry 7
+                 * is available and use it.
+                 */
+                hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7));
+                hpte += 7 * 2;
+                /* HPTE low word - RPN, protection, etc. */
+                hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C |
+                        HPTE_R_M | PP_RWXX;
+                wmb();
+                hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
+                        (i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
+                        HPTE_V_LARGE | HPTE_V_VALID;
+        }
+}
+
+int kvmppc_mmu_hv_init(void)
+{
+        if (!cpu_has_feature(CPU_FTR_HVMODE_206))
+                return -EINVAL;
+        memset(lpid_inuse, 0, sizeof(lpid_inuse));
+        set_bit(mfspr(SPRN_LPID), lpid_inuse);
+        set_bit(LPID_RSVD, lpid_inuse);
+
+        return 0;
+}
+
+void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
+{
+}
+
+static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
+{
+        kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
+}
+
+static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
+                                struct kvmppc_pte *gpte, bool data)
+{
+        return -ENOENT;
+}
+
+void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
+{
+        struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
+
+        vcpu->arch.slb_nr = 32;         /* Assume POWER7 for now */
+
+        mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
+        mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
+
+        vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
+}