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authorAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
committerAnton Arapov <anton@redhat.com>2012-04-16 10:05:28 +0200
commitb4b6116a13633898cf868f2f103c96a90c4c20f8 (patch)
tree93d1b7e2cfcdf473d8d4ff3ad141fa864f8491f6 /arch/powerpc/kvm/book3s_64_mmu_hv.c
parentedd4be777c953e5faafc80d091d3084b4343f5d3 (diff)
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fedora kernel: d9aad82f3319f3cfd1aebc01234254ef0c37ad84v3.3.2-1
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/powerpc/kvm/book3s_64_mmu_hv.c')
-rw-r--r--arch/powerpc/kvm/book3s_64_mmu_hv.c180
1 files changed, 180 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 00000000000..bc3a2ea9421
--- /dev/null
+++ b/arch/powerpc/kvm/book3s_64_mmu_hv.c
@@ -0,0 +1,180 @@
+/*
+ * 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 */
+
+/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
+#define MAX_LPID_970 63
+#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;
+
+ pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
+ return 0;
+}
+
+void kvmppc_free_hpt(struct kvm *kvm)
+{
+ clear_bit(kvm->arch.lpid, lpid_inuse);
+ free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
+}
+
+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;
+ if (!pfn)
+ break;
+ /* 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)
+{
+ unsigned long host_lpid, rsvd_lpid;
+
+ if (!cpu_has_feature(CPU_FTR_HVMODE))
+ return -EINVAL;
+
+ memset(lpid_inuse, 0, sizeof(lpid_inuse));
+
+ if (cpu_has_feature(CPU_FTR_ARCH_206)) {
+ host_lpid = mfspr(SPRN_LPID); /* POWER7 */
+ rsvd_lpid = LPID_RSVD;
+ } else {
+ host_lpid = 0; /* PPC970 */
+ rsvd_lpid = MAX_LPID_970;
+ }
+
+ set_bit(host_lpid, lpid_inuse);
+ /* rsvd_lpid is reserved for use in partition switching */
+ set_bit(rsvd_lpid, 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;
+
+ if (cpu_has_feature(CPU_FTR_ARCH_206))
+ vcpu->arch.slb_nr = 32; /* POWER7 */
+ else
+ vcpu->arch.slb_nr = 64;
+
+ mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
+ mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
+
+ vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
+}