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KVM: Separate rmap_pde from kvm_lpage_info->write_count

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This makes it possible to loop over rmap_pde arrays in the same way as
we do over rmap so that we can optimize kvm_handle_hva_range() easily in
the following patch.

Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>
Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Takuya Yoshikawa 2012-07-02 17:57:17 +09:00 committed by Marcelo Tosatti
parent b3ae209697
commit 77d11309b3
3 changed files with 15 additions and 4 deletions
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2
arch/x86/include/asm/kvm_host.h
View File

@ -500,11 +500,11 @@ struct kvm_vcpu_arch {
};
struct kvm_lpage_info {
unsigned long rmap_pde;
int write_count;
};
struct kvm_arch_memory_slot {
unsigned long *rmap_pde[KVM_NR_PAGE_SIZES - 1];
struct kvm_lpage_info *lpage_info[KVM_NR_PAGE_SIZES - 1];
};

6
arch/x86/kvm/mmu.c
View File

@ -960,13 +960,13 @@ static void pte_list_walk(unsigned long *pte_list, pte_list_walk_fn fn)
static unsigned long *__gfn_to_rmap(gfn_t gfn, int level,
struct kvm_memory_slot *slot)
{
struct kvm_lpage_info *linfo;
unsigned long idx;
if (likely(level == PT_PAGE_TABLE_LEVEL))
return &slot->rmap[gfn - slot->base_gfn];
linfo = lpage_info_slot(gfn, slot, level);
return &linfo->rmap_pde;
idx = gfn_to_index(gfn, slot->base_gfn, level);
return &slot->arch.rmap_pde[level - PT_DIRECTORY_LEVEL][idx];
}
/*

11
arch/x86/kvm/x86.c
View File

@ -6314,6 +6314,10 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free,
int i;
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
if (!dont || free->arch.rmap_pde[i] != dont->arch.rmap_pde[i]) {
kvm_kvfree(free->arch.rmap_pde[i]);
free->arch.rmap_pde[i] = NULL;
}
if (!dont || free->arch.lpage_info[i] != dont->arch.lpage_info[i]) {
kvm_kvfree(free->arch.lpage_info[i]);
free->arch.lpage_info[i] = NULL;
@ -6333,6 +6337,11 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
lpages = gfn_to_index(slot->base_gfn + npages - 1,
slot->base_gfn, level) + 1;
slot->arch.rmap_pde[i] =
kvm_kvzalloc(lpages * sizeof(*slot->arch.rmap_pde[i]));
if (!slot->arch.rmap_pde[i])
goto out_free;
slot->arch.lpage_info[i] =
kvm_kvzalloc(lpages * sizeof(*slot->arch.lpage_info[i]));
if (!slot->arch.lpage_info[i])
@ -6361,7 +6370,9 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages)
out_free:
for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
kvm_kvfree(slot->arch.rmap_pde[i]);
kvm_kvfree(slot->arch.lpage_info[i]);
slot->arch.rmap_pde[i] = NULL;
slot->arch.lpage_info[i] = NULL;
}
return -ENOMEM;