mirror of https://gitee.com/openkylin/linux.git
KVM: Remove memory alias support
As advertised in feature-removal-schedule.txt. Equivalent support is provided by overlapping memory regions. Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
parent
fc34531db3
commit
a1f4d39500
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@ -538,17 +538,6 @@ Who: Jan Kiszka <jan.kiszka@web.de>
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----------------------------
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What: KVM memory aliases support
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When: July 2010
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Why: Memory aliasing support is used for speeding up guest vga access
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through the vga windows.
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Modern userspace no longer uses this feature, so it's just bitrotted
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code and can be removed with no impact.
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Who: Avi Kivity <avi@redhat.com>
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----------------------------
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What: xtime, wall_to_monotonic
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When: 2.6.36+
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Files: kernel/time/timekeeping.c include/linux/time.h
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@ -226,17 +226,7 @@ Type: vm ioctl
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Parameters: struct kvm_memory_alias (in)
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Returns: 0 (success), -1 (error)
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struct kvm_memory_alias {
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__u32 slot; /* this has a different namespace than memory slots */
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__u32 flags;
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__u64 guest_phys_addr;
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__u64 memory_size;
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__u64 target_phys_addr;
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};
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Defines a guest physical address space region as an alias to another
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region. Useful for aliased address, for example the VGA low memory
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window. Should not be used with userspace memory.
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This ioctl is obsolete and has been removed.
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4.9 KVM_RUN
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@ -1946,11 +1946,6 @@ int kvm_cpu_has_pending_timer(struct kvm_vcpu *vcpu)
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return vcpu->arch.timer_fired;
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}
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
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{
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return gfn;
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}
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *vcpu)
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{
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return (vcpu->arch.mp_state == KVM_MP_STATE_RUNNABLE) ||
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@ -36,11 +36,6 @@
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#define CREATE_TRACE_POINTS
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#include "trace.h"
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
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{
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return gfn;
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}
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int kvm_arch_vcpu_runnable(struct kvm_vcpu *v)
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{
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return !(v->arch.msr & MSR_WE) || !!(v->arch.pending_exceptions);
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@ -723,11 +723,6 @@ void kvm_arch_flush_shadow(struct kvm *kvm)
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{
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}
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
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{
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return gfn;
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}
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static int __init kvm_s390_init(void)
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{
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int ret;
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@ -69,8 +69,6 @@
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#define IOPL_SHIFT 12
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#define KVM_ALIAS_SLOTS 4
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#define KVM_PERMILLE_MMU_PAGES 20
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#define KVM_MIN_ALLOC_MMU_PAGES 64
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#define KVM_MMU_HASH_SHIFT 10
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@ -362,24 +360,7 @@ struct kvm_vcpu_arch {
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u64 hv_vapic;
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};
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struct kvm_mem_alias {
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gfn_t base_gfn;
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unsigned long npages;
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gfn_t target_gfn;
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#define KVM_ALIAS_INVALID 1UL
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unsigned long flags;
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};
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#define KVM_ARCH_HAS_UNALIAS_INSTANTIATION
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struct kvm_mem_aliases {
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struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
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int naliases;
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};
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struct kvm_arch {
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struct kvm_mem_aliases *aliases;
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unsigned int n_free_mmu_pages;
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unsigned int n_requested_mmu_pages;
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unsigned int n_alloc_mmu_pages;
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@ -655,8 +636,6 @@ void kvm_disable_tdp(void);
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int complete_pio(struct kvm_vcpu *vcpu);
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bool kvm_check_iopl(struct kvm_vcpu *vcpu);
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struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn);
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static inline struct kvm_mmu_page *page_header(hpa_t shadow_page)
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{
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struct page *page = pfn_to_page(shadow_page >> PAGE_SHIFT);
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@ -434,9 +434,7 @@ static void account_shadowed(struct kvm *kvm, gfn_t gfn)
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int *write_count;
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int i;
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gfn = unalias_gfn(kvm, gfn);
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slot = gfn_to_memslot_unaliased(kvm, gfn);
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slot = gfn_to_memslot(kvm, gfn);
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for (i = PT_DIRECTORY_LEVEL;
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i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
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write_count = slot_largepage_idx(gfn, slot, i);
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@ -450,8 +448,7 @@ static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn)
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int *write_count;
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int i;
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gfn = unalias_gfn(kvm, gfn);
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slot = gfn_to_memslot_unaliased(kvm, gfn);
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slot = gfn_to_memslot(kvm, gfn);
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for (i = PT_DIRECTORY_LEVEL;
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i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) {
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write_count = slot_largepage_idx(gfn, slot, i);
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@ -467,8 +464,7 @@ static int has_wrprotected_page(struct kvm *kvm,
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struct kvm_memory_slot *slot;
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int *largepage_idx;
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gfn = unalias_gfn(kvm, gfn);
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slot = gfn_to_memslot_unaliased(kvm, gfn);
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slot = gfn_to_memslot(kvm, gfn);
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if (slot) {
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largepage_idx = slot_largepage_idx(gfn, slot, level);
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return *largepage_idx;
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@ -521,7 +517,6 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn)
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/*
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* Take gfn and return the reverse mapping to it.
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* Note: gfn must be unaliased before this function get called
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*/
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static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level)
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@ -561,7 +556,6 @@ static int rmap_add(struct kvm_vcpu *vcpu, u64 *spte, gfn_t gfn)
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if (!is_rmap_spte(*spte))
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return count;
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gfn = unalias_gfn(vcpu->kvm, gfn);
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sp = page_header(__pa(spte));
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kvm_mmu_page_set_gfn(sp, spte - sp->spt, gfn);
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rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
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@ -698,7 +692,6 @@ static int rmap_write_protect(struct kvm *kvm, u64 gfn)
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u64 *spte;
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int i, write_protected = 0;
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gfn = unalias_gfn(kvm, gfn);
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rmapp = gfn_to_rmap(kvm, gfn, PT_PAGE_TABLE_LEVEL);
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spte = rmap_next(kvm, rmapp, NULL);
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sp = page_header(__pa(spte));
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gfn = unalias_gfn(vcpu->kvm, gfn);
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rmapp = gfn_to_rmap(vcpu->kvm, gfn, sp->role.level);
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kvm_unmap_rmapp(vcpu->kvm, rmapp, 0);
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@ -3510,8 +3502,7 @@ static void audit_write_protection(struct kvm_vcpu *vcpu)
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if (sp->unsync)
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continue;
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gfn = unalias_gfn(vcpu->kvm, sp->gfn);
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slot = gfn_to_memslot_unaliased(vcpu->kvm, sp->gfn);
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slot = gfn_to_memslot(vcpu->kvm, sp->gfn);
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rmapp = &slot->rmap[gfn - slot->base_gfn];
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spte = rmap_next(vcpu->kvm, rmapp, NULL);
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@ -576,7 +576,6 @@ static void FNAME(prefetch_page)(struct kvm_vcpu *vcpu,
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* Using the cached information from sp->gfns is safe because:
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* - The spte has a reference to the struct page, so the pfn for a given gfn
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* can't change unless all sptes pointing to it are nuked first.
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* - Alias changes zap the entire shadow cache.
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*/
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static int FNAME(sync_page)(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp,
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bool clear_unsync)
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return -EINVAL;
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gfn = gpte_to_gfn(gpte);
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if (unalias_gfn(vcpu->kvm, gfn) != sp->gfns[i] ||
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if (gfn != sp->gfns[i] ||
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!is_present_gpte(gpte) || !(gpte & PT_ACCESSED_MASK)) {
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u64 nonpresent;
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@ -2740,115 +2740,6 @@ static int kvm_vm_ioctl_get_nr_mmu_pages(struct kvm *kvm)
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return kvm->arch.n_alloc_mmu_pages;
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}
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gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn)
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{
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int i;
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struct kvm_mem_alias *alias;
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struct kvm_mem_aliases *aliases;
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aliases = kvm_aliases(kvm);
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for (i = 0; i < aliases->naliases; ++i) {
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alias = &aliases->aliases[i];
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if (alias->flags & KVM_ALIAS_INVALID)
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continue;
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if (gfn >= alias->base_gfn
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&& gfn < alias->base_gfn + alias->npages)
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return alias->target_gfn + gfn - alias->base_gfn;
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}
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return gfn;
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}
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
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{
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int i;
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struct kvm_mem_alias *alias;
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struct kvm_mem_aliases *aliases;
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aliases = kvm_aliases(kvm);
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for (i = 0; i < aliases->naliases; ++i) {
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alias = &aliases->aliases[i];
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if (gfn >= alias->base_gfn
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&& gfn < alias->base_gfn + alias->npages)
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return alias->target_gfn + gfn - alias->base_gfn;
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}
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return gfn;
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}
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/*
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* Set a new alias region. Aliases map a portion of physical memory into
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* another portion. This is useful for memory windows, for example the PC
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* VGA region.
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*/
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static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
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struct kvm_memory_alias *alias)
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{
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int r, n;
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struct kvm_mem_alias *p;
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struct kvm_mem_aliases *aliases, *old_aliases;
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r = -EINVAL;
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/* General sanity checks */
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if (alias->memory_size & (PAGE_SIZE - 1))
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goto out;
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if (alias->guest_phys_addr & (PAGE_SIZE - 1))
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goto out;
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if (alias->slot >= KVM_ALIAS_SLOTS)
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goto out;
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if (alias->guest_phys_addr + alias->memory_size
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< alias->guest_phys_addr)
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goto out;
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if (alias->target_phys_addr + alias->memory_size
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< alias->target_phys_addr)
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goto out;
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r = -ENOMEM;
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aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
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if (!aliases)
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goto out;
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mutex_lock(&kvm->slots_lock);
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/* invalidate any gfn reference in case of deletion/shrinking */
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memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases));
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aliases->aliases[alias->slot].flags |= KVM_ALIAS_INVALID;
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old_aliases = kvm->arch.aliases;
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rcu_assign_pointer(kvm->arch.aliases, aliases);
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synchronize_srcu_expedited(&kvm->srcu);
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kvm_mmu_zap_all(kvm);
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kfree(old_aliases);
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r = -ENOMEM;
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aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
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if (!aliases)
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goto out_unlock;
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memcpy(aliases, kvm->arch.aliases, sizeof(struct kvm_mem_aliases));
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p = &aliases->aliases[alias->slot];
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p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
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p->npages = alias->memory_size >> PAGE_SHIFT;
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p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
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p->flags &= ~(KVM_ALIAS_INVALID);
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for (n = KVM_ALIAS_SLOTS; n > 0; --n)
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if (aliases->aliases[n - 1].npages)
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break;
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aliases->naliases = n;
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old_aliases = kvm->arch.aliases;
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rcu_assign_pointer(kvm->arch.aliases, aliases);
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synchronize_srcu_expedited(&kvm->srcu);
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kfree(old_aliases);
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r = 0;
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out_unlock:
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mutex_unlock(&kvm->slots_lock);
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out:
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return r;
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}
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static int kvm_vm_ioctl_get_irqchip(struct kvm *kvm, struct kvm_irqchip *chip)
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{
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int r;
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@ -3056,7 +2947,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
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union {
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struct kvm_pit_state ps;
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struct kvm_pit_state2 ps2;
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struct kvm_memory_alias alias;
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struct kvm_pit_config pit_config;
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} u;
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@ -3101,14 +2991,6 @@ long kvm_arch_vm_ioctl(struct file *filp,
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case KVM_GET_NR_MMU_PAGES:
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r = kvm_vm_ioctl_get_nr_mmu_pages(kvm);
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break;
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case KVM_SET_MEMORY_ALIAS:
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r = -EFAULT;
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if (copy_from_user(&u.alias, argp, sizeof(struct kvm_memory_alias)))
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goto out;
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r = kvm_vm_ioctl_set_memory_alias(kvm, &u.alias);
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if (r)
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goto out;
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break;
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case KVM_CREATE_IRQCHIP: {
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struct kvm_pic *vpic;
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@ -5559,12 +5441,6 @@ struct kvm *kvm_arch_create_vm(void)
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if (!kvm)
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return ERR_PTR(-ENOMEM);
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kvm->arch.aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
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if (!kvm->arch.aliases) {
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kfree(kvm);
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return ERR_PTR(-ENOMEM);
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}
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INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
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INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
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@ -5622,7 +5498,6 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
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if (kvm->arch.ept_identity_pagetable)
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put_page(kvm->arch.ept_identity_pagetable);
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cleanup_srcu_struct(&kvm->srcu);
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kfree(kvm->arch.aliases);
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kfree(kvm);
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}
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@ -65,13 +65,6 @@ static inline int is_paging(struct kvm_vcpu *vcpu)
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return kvm_read_cr0_bits(vcpu, X86_CR0_PG);
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}
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static inline struct kvm_mem_aliases *kvm_aliases(struct kvm *kvm)
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{
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return rcu_dereference_check(kvm->arch.aliases,
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srcu_read_lock_held(&kvm->srcu)
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|| lockdep_is_held(&kvm->slots_lock));
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}
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void kvm_before_handle_nmi(struct kvm_vcpu *vcpu);
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void kvm_after_handle_nmi(struct kvm_vcpu *vcpu);
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@ -619,6 +619,7 @@ struct kvm_clock_data {
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*/
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#define KVM_CREATE_VCPU _IO(KVMIO, 0x41)
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#define KVM_GET_DIRTY_LOG _IOW(KVMIO, 0x42, struct kvm_dirty_log)
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/* KVM_SET_MEMORY_ALIAS is obsolete: */
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#define KVM_SET_MEMORY_ALIAS _IOW(KVMIO, 0x43, struct kvm_memory_alias)
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#define KVM_SET_NR_MMU_PAGES _IO(KVMIO, 0x44)
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#define KVM_GET_NR_MMU_PAGES _IO(KVMIO, 0x45)
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@ -286,8 +286,6 @@ void kvm_arch_commit_memory_region(struct kvm *kvm,
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int user_alloc);
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void kvm_disable_largepages(void);
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void kvm_arch_flush_shadow(struct kvm *kvm);
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gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
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gfn_t unalias_gfn_instantiation(struct kvm *kvm, gfn_t gfn);
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struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
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unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn);
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@ -564,10 +562,6 @@ static inline int mmu_notifier_retry(struct kvm_vcpu *vcpu, unsigned long mmu_se
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}
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#endif
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#ifndef KVM_ARCH_HAS_UNALIAS_INSTANTIATION
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#define unalias_gfn_instantiation unalias_gfn
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#endif
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#ifdef CONFIG_HAVE_KVM_IRQCHIP
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#define KVM_MAX_IRQ_ROUTES 1024
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|
|
@ -841,7 +841,7 @@ int kvm_is_error_hva(unsigned long addr)
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}
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EXPORT_SYMBOL_GPL(kvm_is_error_hva);
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||||
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||||
struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
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||||
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
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||||
{
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||||
int i;
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||||
struct kvm_memslots *slots = kvm_memslots(kvm);
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||||
|
@ -855,20 +855,13 @@ struct kvm_memory_slot *gfn_to_memslot_unaliased(struct kvm *kvm, gfn_t gfn)
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|||
}
|
||||
return NULL;
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(gfn_to_memslot_unaliased);
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||||
|
||||
struct kvm_memory_slot *gfn_to_memslot(struct kvm *kvm, gfn_t gfn)
|
||||
{
|
||||
gfn = unalias_gfn(kvm, gfn);
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||||
return gfn_to_memslot_unaliased(kvm, gfn);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(gfn_to_memslot);
|
||||
|
||||
int kvm_is_visible_gfn(struct kvm *kvm, gfn_t gfn)
|
||||
{
|
||||
int i;
|
||||
struct kvm_memslots *slots = kvm_memslots(kvm);
|
||||
|
||||
gfn = unalias_gfn_instantiation(kvm, gfn);
|
||||
for (i = 0; i < KVM_MEMORY_SLOTS; ++i) {
|
||||
struct kvm_memory_slot *memslot = &slots->memslots[i];
|
||||
|
||||
|
@ -913,7 +906,6 @@ int memslot_id(struct kvm *kvm, gfn_t gfn)
|
|||
struct kvm_memslots *slots = kvm_memslots(kvm);
|
||||
struct kvm_memory_slot *memslot = NULL;
|
||||
|
||||
gfn = unalias_gfn(kvm, gfn);
|
||||
for (i = 0; i < slots->nmemslots; ++i) {
|
||||
memslot = &slots->memslots[i];
|
||||
|
||||
|
@ -934,8 +926,7 @@ unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn)
|
|||
{
|
||||
struct kvm_memory_slot *slot;
|
||||
|
||||
gfn = unalias_gfn_instantiation(kvm, gfn);
|
||||
slot = gfn_to_memslot_unaliased(kvm, gfn);
|
||||
slot = gfn_to_memslot(kvm, gfn);
|
||||
if (!slot || slot->flags & KVM_MEMSLOT_INVALID)
|
||||
return bad_hva();
|
||||
return gfn_to_hva_memslot(slot, gfn);
|
||||
|
@ -1202,8 +1193,7 @@ void mark_page_dirty(struct kvm *kvm, gfn_t gfn)
|
|||
{
|
||||
struct kvm_memory_slot *memslot;
|
||||
|
||||
gfn = unalias_gfn(kvm, gfn);
|
||||
memslot = gfn_to_memslot_unaliased(kvm, gfn);
|
||||
memslot = gfn_to_memslot(kvm, gfn);
|
||||
if (memslot && memslot->dirty_bitmap) {
|
||||
unsigned long rel_gfn = gfn - memslot->base_gfn;
|
||||
|
||||
|
|
Loading…
Reference in New Issue