181 lines
4.7 KiB
C
181 lines
4.7 KiB
C
/*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License, version 2, as
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* published by the Free Software Foundation.
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*
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* This program is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
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*
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* Copyright 2010 Paul Mackerras, IBM Corp. <paulus@au1.ibm.com>
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*/
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#include <linux/types.h>
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#include <linux/string.h>
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#include <linux/kvm.h>
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#include <linux/kvm_host.h>
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#include <linux/highmem.h>
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#include <linux/gfp.h>
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#include <linux/slab.h>
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#include <linux/hugetlb.h>
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#include <asm/tlbflush.h>
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#include <asm/kvm_ppc.h>
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#include <asm/kvm_book3s.h>
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#include <asm/mmu-hash64.h>
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#include <asm/hvcall.h>
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#include <asm/synch.h>
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#include <asm/ppc-opcode.h>
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#include <asm/cputable.h>
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/* For now use fixed-size 16MB page table */
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#define HPT_ORDER 24
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#define HPT_NPTEG (1ul << (HPT_ORDER - 7)) /* 128B per pteg */
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#define HPT_HASH_MASK (HPT_NPTEG - 1)
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/* Pages in the VRMA are 16MB pages */
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#define VRMA_PAGE_ORDER 24
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#define VRMA_VSID 0x1ffffffUL /* 1TB VSID reserved for VRMA */
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/* POWER7 has 10-bit LPIDs, PPC970 has 6-bit LPIDs */
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#define MAX_LPID_970 63
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#define NR_LPIDS (LPID_RSVD + 1)
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unsigned long lpid_inuse[BITS_TO_LONGS(NR_LPIDS)];
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long kvmppc_alloc_hpt(struct kvm *kvm)
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{
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unsigned long hpt;
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unsigned long lpid;
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hpt = __get_free_pages(GFP_KERNEL|__GFP_ZERO|__GFP_REPEAT|__GFP_NOWARN,
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HPT_ORDER - PAGE_SHIFT);
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if (!hpt) {
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pr_err("kvm_alloc_hpt: Couldn't alloc HPT\n");
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return -ENOMEM;
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}
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kvm->arch.hpt_virt = hpt;
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do {
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lpid = find_first_zero_bit(lpid_inuse, NR_LPIDS);
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if (lpid >= NR_LPIDS) {
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pr_err("kvm_alloc_hpt: No LPIDs free\n");
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free_pages(hpt, HPT_ORDER - PAGE_SHIFT);
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return -ENOMEM;
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}
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} while (test_and_set_bit(lpid, lpid_inuse));
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kvm->arch.sdr1 = __pa(hpt) | (HPT_ORDER - 18);
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kvm->arch.lpid = lpid;
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pr_info("KVM guest htab at %lx, LPID %lx\n", hpt, lpid);
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return 0;
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}
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void kvmppc_free_hpt(struct kvm *kvm)
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{
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clear_bit(kvm->arch.lpid, lpid_inuse);
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free_pages(kvm->arch.hpt_virt, HPT_ORDER - PAGE_SHIFT);
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}
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void kvmppc_map_vrma(struct kvm *kvm, struct kvm_userspace_memory_region *mem)
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{
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unsigned long i;
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unsigned long npages = kvm->arch.ram_npages;
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unsigned long pfn;
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unsigned long *hpte;
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unsigned long hash;
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struct kvmppc_pginfo *pginfo = kvm->arch.ram_pginfo;
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if (!pginfo)
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return;
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/* VRMA can't be > 1TB */
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if (npages > 1ul << (40 - kvm->arch.ram_porder))
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npages = 1ul << (40 - kvm->arch.ram_porder);
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/* Can't use more than 1 HPTE per HPTEG */
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if (npages > HPT_NPTEG)
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npages = HPT_NPTEG;
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for (i = 0; i < npages; ++i) {
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pfn = pginfo[i].pfn;
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if (!pfn)
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break;
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/* can't use hpt_hash since va > 64 bits */
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hash = (i ^ (VRMA_VSID ^ (VRMA_VSID << 25))) & HPT_HASH_MASK;
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/*
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* We assume that the hash table is empty and no
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* vcpus are using it at this stage. Since we create
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* at most one HPTE per HPTEG, we just assume entry 7
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* is available and use it.
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*/
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hpte = (unsigned long *) (kvm->arch.hpt_virt + (hash << 7));
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hpte += 7 * 2;
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/* HPTE low word - RPN, protection, etc. */
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hpte[1] = (pfn << PAGE_SHIFT) | HPTE_R_R | HPTE_R_C |
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HPTE_R_M | PP_RWXX;
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wmb();
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hpte[0] = HPTE_V_1TB_SEG | (VRMA_VSID << (40 - 16)) |
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(i << (VRMA_PAGE_ORDER - 16)) | HPTE_V_BOLTED |
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HPTE_V_LARGE | HPTE_V_VALID;
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}
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}
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int kvmppc_mmu_hv_init(void)
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{
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unsigned long host_lpid, rsvd_lpid;
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if (!cpu_has_feature(CPU_FTR_HVMODE))
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return -EINVAL;
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memset(lpid_inuse, 0, sizeof(lpid_inuse));
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if (cpu_has_feature(CPU_FTR_ARCH_206)) {
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host_lpid = mfspr(SPRN_LPID); /* POWER7 */
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rsvd_lpid = LPID_RSVD;
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} else {
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host_lpid = 0; /* PPC970 */
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rsvd_lpid = MAX_LPID_970;
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}
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set_bit(host_lpid, lpid_inuse);
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/* rsvd_lpid is reserved for use in partition switching */
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set_bit(rsvd_lpid, lpid_inuse);
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return 0;
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}
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void kvmppc_mmu_destroy(struct kvm_vcpu *vcpu)
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{
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}
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static void kvmppc_mmu_book3s_64_hv_reset_msr(struct kvm_vcpu *vcpu)
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{
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kvmppc_set_msr(vcpu, MSR_SF | MSR_ME);
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}
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static int kvmppc_mmu_book3s_64_hv_xlate(struct kvm_vcpu *vcpu, gva_t eaddr,
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struct kvmppc_pte *gpte, bool data)
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{
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return -ENOENT;
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}
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void kvmppc_mmu_book3s_hv_init(struct kvm_vcpu *vcpu)
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{
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struct kvmppc_mmu *mmu = &vcpu->arch.mmu;
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if (cpu_has_feature(CPU_FTR_ARCH_206))
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vcpu->arch.slb_nr = 32; /* POWER7 */
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else
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vcpu->arch.slb_nr = 64;
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mmu->xlate = kvmppc_mmu_book3s_64_hv_xlate;
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mmu->reset_msr = kvmppc_mmu_book3s_64_hv_reset_msr;
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vcpu->arch.hflags |= BOOK3S_HFLAG_SLB;
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}
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