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![Paul Mackerras](/assets/img/avatar_default.png)
This relaxes the requirement that the guest memory be provided as 16MB huge pages, allowing it to be provided as normal memory, i.e. in pages of PAGE_SIZE bytes (4k or 64k). To allow this, we index the kvm->arch.slot_phys[] arrays with a small page index, even if huge pages are being used, and use the low-order 5 bits of each entry to store the order of the enclosing page with respect to normal pages, i.e. log_2(enclosing_page_size / PAGE_SIZE). Signed-off-by: Paul Mackerras <paulus@samba.org> Signed-off-by: Alexander Graf <agraf@suse.de> Signed-off-by: Avi Kivity <avi@redhat.com>
398 lines
10 KiB
C
398 lines
10 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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* Copyright 2010-2011 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/hugetlb.h>
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#include <linux/module.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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/*
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* Since this file is built in even if KVM is a module, we need
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* a local copy of this function for the case where kvm_main.c is
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* modular.
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*/
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static struct kvm_memory_slot *builtin_gfn_to_memslot(struct kvm *kvm,
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gfn_t gfn)
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{
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struct kvm_memslots *slots;
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struct kvm_memory_slot *memslot;
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slots = kvm_memslots(kvm);
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kvm_for_each_memslot(memslot, slots)
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if (gfn >= memslot->base_gfn &&
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gfn < memslot->base_gfn + memslot->npages)
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return memslot;
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return NULL;
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}
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/* Translate address of a vmalloc'd thing to a linear map address */
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static void *real_vmalloc_addr(void *x)
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{
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unsigned long addr = (unsigned long) x;
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pte_t *p;
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p = find_linux_pte(swapper_pg_dir, addr);
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if (!p || !pte_present(*p))
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return NULL;
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/* assume we don't have huge pages in vmalloc space... */
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addr = (pte_pfn(*p) << PAGE_SHIFT) | (addr & ~PAGE_MASK);
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return __va(addr);
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}
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long kvmppc_h_enter(struct kvm_vcpu *vcpu, unsigned long flags,
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long pte_index, unsigned long pteh, unsigned long ptel)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long i, pa, gpa, gfn, psize;
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unsigned long slot_fn;
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unsigned long *hpte;
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struct revmap_entry *rev;
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unsigned long g_ptel = ptel;
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struct kvm_memory_slot *memslot;
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unsigned long *physp, pte_size;
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bool realmode = vcpu->arch.vcore->vcore_state == VCORE_RUNNING;
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psize = hpte_page_size(pteh, ptel);
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if (!psize)
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return H_PARAMETER;
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/* Find the memslot (if any) for this address */
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gpa = (ptel & HPTE_R_RPN) & ~(psize - 1);
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gfn = gpa >> PAGE_SHIFT;
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memslot = builtin_gfn_to_memslot(kvm, gfn);
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if (!(memslot && !(memslot->flags & KVM_MEMSLOT_INVALID)))
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return H_PARAMETER;
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/* Check if the requested page fits entirely in the memslot. */
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if (!slot_is_aligned(memslot, psize))
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return H_PARAMETER;
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slot_fn = gfn - memslot->base_gfn;
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physp = kvm->arch.slot_phys[memslot->id];
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if (!physp)
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return H_PARAMETER;
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physp += slot_fn;
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if (realmode)
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physp = real_vmalloc_addr(physp);
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pa = *physp;
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if (!pa)
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return H_TOO_HARD;
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pte_size = PAGE_SIZE << (pa & KVMPPC_PAGE_ORDER_MASK);
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pa &= PAGE_MASK;
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if (pte_size < psize)
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return H_PARAMETER;
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if (pa && pte_size > psize)
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pa |= gpa & (pte_size - 1);
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ptel &= ~(HPTE_R_PP0 - psize);
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ptel |= pa;
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/* Check WIMG */
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if ((ptel & HPTE_R_WIMG) != HPTE_R_M &&
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(ptel & HPTE_R_WIMG) != (HPTE_R_W | HPTE_R_I | HPTE_R_M))
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return H_PARAMETER;
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pteh &= ~0x60UL;
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pteh |= HPTE_V_VALID;
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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if (likely((flags & H_EXACT) == 0)) {
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pte_index &= ~7UL;
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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for (i = 0; i < 8; ++i) {
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if ((*hpte & HPTE_V_VALID) == 0 &&
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try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID))
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break;
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hpte += 2;
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}
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if (i == 8) {
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/*
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* Since try_lock_hpte doesn't retry (not even stdcx.
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* failures), it could be that there is a free slot
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* but we transiently failed to lock it. Try again,
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* actually locking each slot and checking it.
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*/
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hpte -= 16;
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for (i = 0; i < 8; ++i) {
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if ((*hpte & HPTE_V_VALID) == 0)
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break;
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*hpte &= ~HPTE_V_HVLOCK;
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hpte += 2;
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}
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if (i == 8)
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return H_PTEG_FULL;
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}
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pte_index += i;
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} else {
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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if (!try_lock_hpte(hpte, HPTE_V_HVLOCK | HPTE_V_VALID)) {
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/* Lock the slot and check again */
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if (*hpte & HPTE_V_VALID) {
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*hpte &= ~HPTE_V_HVLOCK;
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return H_PTEG_FULL;
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}
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}
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}
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/* Save away the guest's idea of the second HPTE dword */
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rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
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if (rev)
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rev->guest_rpte = g_ptel;
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hpte[1] = ptel;
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eieio();
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hpte[0] = pteh;
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asm volatile("ptesync" : : : "memory");
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vcpu->arch.gpr[4] = pte_index;
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return H_SUCCESS;
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}
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EXPORT_SYMBOL_GPL(kvmppc_h_enter);
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#define LOCK_TOKEN (*(u32 *)(&get_paca()->lock_token))
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static inline int try_lock_tlbie(unsigned int *lock)
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{
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unsigned int tmp, old;
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unsigned int token = LOCK_TOKEN;
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asm volatile("1:lwarx %1,0,%2\n"
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" cmpwi cr0,%1,0\n"
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" bne 2f\n"
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" stwcx. %3,0,%2\n"
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" bne- 1b\n"
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" isync\n"
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"2:"
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: "=&r" (tmp), "=&r" (old)
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: "r" (lock), "r" (token)
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: "cc", "memory");
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return old == 0;
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}
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long kvmppc_h_remove(struct kvm_vcpu *vcpu, unsigned long flags,
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unsigned long pte_index, unsigned long avpn,
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unsigned long va)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *hpte;
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unsigned long v, r, rb;
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if ((hpte[0] & HPTE_V_VALID) == 0 ||
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((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn) ||
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((flags & H_ANDCOND) && (hpte[0] & avpn) != 0)) {
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hpte[0] &= ~HPTE_V_HVLOCK;
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return H_NOT_FOUND;
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}
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if (atomic_read(&kvm->online_vcpus) == 1)
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flags |= H_LOCAL;
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vcpu->arch.gpr[4] = v = hpte[0] & ~HPTE_V_HVLOCK;
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vcpu->arch.gpr[5] = r = hpte[1];
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rb = compute_tlbie_rb(v, r, pte_index);
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hpte[0] = 0;
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if (!(flags & H_LOCAL)) {
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while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
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cpu_relax();
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asm volatile("ptesync" : : : "memory");
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asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
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: : "r" (rb), "r" (kvm->arch.lpid));
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asm volatile("ptesync" : : : "memory");
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kvm->arch.tlbie_lock = 0;
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} else {
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asm volatile("ptesync" : : : "memory");
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asm volatile("tlbiel %0" : : "r" (rb));
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asm volatile("ptesync" : : : "memory");
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}
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return H_SUCCESS;
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}
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long kvmppc_h_bulk_remove(struct kvm_vcpu *vcpu)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *args = &vcpu->arch.gpr[4];
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unsigned long *hp, tlbrb[4];
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long int i, found;
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long int n_inval = 0;
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unsigned long flags, req, pte_index;
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long int local = 0;
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long int ret = H_SUCCESS;
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if (atomic_read(&kvm->online_vcpus) == 1)
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local = 1;
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for (i = 0; i < 4; ++i) {
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pte_index = args[i * 2];
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flags = pte_index >> 56;
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pte_index &= ((1ul << 56) - 1);
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req = flags >> 6;
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flags &= 3;
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if (req == 3)
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break;
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if (req != 1 || flags == 3 ||
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pte_index >= HPT_NPTE) {
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/* parameter error */
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args[i * 2] = ((0xa0 | flags) << 56) + pte_index;
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ret = H_PARAMETER;
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break;
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}
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hp = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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while (!try_lock_hpte(hp, HPTE_V_HVLOCK))
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cpu_relax();
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found = 0;
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if (hp[0] & HPTE_V_VALID) {
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switch (flags & 3) {
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case 0: /* absolute */
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found = 1;
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break;
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case 1: /* andcond */
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if (!(hp[0] & args[i * 2 + 1]))
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found = 1;
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break;
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case 2: /* AVPN */
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if ((hp[0] & ~0x7fUL) == args[i * 2 + 1])
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found = 1;
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break;
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}
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}
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if (!found) {
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hp[0] &= ~HPTE_V_HVLOCK;
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args[i * 2] = ((0x90 | flags) << 56) + pte_index;
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continue;
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}
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/* insert R and C bits from PTE */
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flags |= (hp[1] >> 5) & 0x0c;
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args[i * 2] = ((0x80 | flags) << 56) + pte_index;
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tlbrb[n_inval++] = compute_tlbie_rb(hp[0], hp[1], pte_index);
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hp[0] = 0;
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}
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if (n_inval == 0)
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return ret;
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if (!local) {
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while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
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cpu_relax();
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asm volatile("ptesync" : : : "memory");
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for (i = 0; i < n_inval; ++i)
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asm volatile(PPC_TLBIE(%1,%0)
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: : "r" (tlbrb[i]), "r" (kvm->arch.lpid));
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asm volatile("eieio; tlbsync; ptesync" : : : "memory");
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kvm->arch.tlbie_lock = 0;
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} else {
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asm volatile("ptesync" : : : "memory");
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for (i = 0; i < n_inval; ++i)
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asm volatile("tlbiel %0" : : "r" (tlbrb[i]));
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asm volatile("ptesync" : : : "memory");
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}
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return ret;
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}
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long kvmppc_h_protect(struct kvm_vcpu *vcpu, unsigned long flags,
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unsigned long pte_index, unsigned long avpn,
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unsigned long va)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *hpte;
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struct revmap_entry *rev;
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unsigned long v, r, rb, mask, bits;
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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while (!try_lock_hpte(hpte, HPTE_V_HVLOCK))
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cpu_relax();
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if ((hpte[0] & HPTE_V_VALID) == 0 ||
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((flags & H_AVPN) && (hpte[0] & ~0x7fUL) != avpn)) {
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hpte[0] &= ~HPTE_V_HVLOCK;
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return H_NOT_FOUND;
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}
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if (atomic_read(&kvm->online_vcpus) == 1)
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flags |= H_LOCAL;
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v = hpte[0];
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bits = (flags << 55) & HPTE_R_PP0;
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bits |= (flags << 48) & HPTE_R_KEY_HI;
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bits |= flags & (HPTE_R_PP | HPTE_R_N | HPTE_R_KEY_LO);
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/* Update guest view of 2nd HPTE dword */
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mask = HPTE_R_PP0 | HPTE_R_PP | HPTE_R_N |
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HPTE_R_KEY_HI | HPTE_R_KEY_LO;
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rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
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if (rev) {
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r = (rev->guest_rpte & ~mask) | bits;
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rev->guest_rpte = r;
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}
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r = (hpte[1] & ~mask) | bits;
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/* Update HPTE */
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rb = compute_tlbie_rb(v, r, pte_index);
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hpte[0] = v & ~HPTE_V_VALID;
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if (!(flags & H_LOCAL)) {
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while(!try_lock_tlbie(&kvm->arch.tlbie_lock))
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cpu_relax();
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asm volatile("ptesync" : : : "memory");
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asm volatile(PPC_TLBIE(%1,%0)"; eieio; tlbsync"
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: : "r" (rb), "r" (kvm->arch.lpid));
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asm volatile("ptesync" : : : "memory");
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kvm->arch.tlbie_lock = 0;
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} else {
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asm volatile("ptesync" : : : "memory");
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asm volatile("tlbiel %0" : : "r" (rb));
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asm volatile("ptesync" : : : "memory");
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}
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hpte[1] = r;
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eieio();
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hpte[0] = v & ~HPTE_V_HVLOCK;
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asm volatile("ptesync" : : : "memory");
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return H_SUCCESS;
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}
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long kvmppc_h_read(struct kvm_vcpu *vcpu, unsigned long flags,
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unsigned long pte_index)
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{
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struct kvm *kvm = vcpu->kvm;
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unsigned long *hpte, r;
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int i, n = 1;
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struct revmap_entry *rev = NULL;
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if (pte_index >= HPT_NPTE)
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return H_PARAMETER;
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if (flags & H_READ_4) {
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pte_index &= ~3;
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n = 4;
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}
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if (flags & H_R_XLATE)
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rev = real_vmalloc_addr(&kvm->arch.revmap[pte_index]);
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for (i = 0; i < n; ++i, ++pte_index) {
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hpte = (unsigned long *)(kvm->arch.hpt_virt + (pte_index << 4));
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r = hpte[1];
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if (hpte[0] & HPTE_V_VALID) {
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if (rev)
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r = rev[i].guest_rpte;
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else
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r = hpte[1] | HPTE_R_RPN;
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}
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vcpu->arch.gpr[4 + i * 2] = hpte[0];
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vcpu->arch.gpr[5 + i * 2] = r;
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}
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return H_SUCCESS;
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}
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