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KVM: modify alias layout in x86s struct kvm_arch 

Have a pointer to an allocated region inside x86's kvm_arch.

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
This commit is contained in:
Marcelo Tosatti 2009-12-23 14:35:17 -02:00
parent 46a26bf557
commit fef9cce0eb
2 changed files with 22 additions and 7 deletions
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8
arch/x86/include/asm/kvm_host.h
View File

@ -370,9 +370,13 @@ struct kvm_mem_alias {
gfn_t target_gfn;
};
struct kvm_arch{
int naliases;
struct kvm_mem_aliases {
struct kvm_mem_alias aliases[KVM_ALIAS_SLOTS];
int naliases;
};
struct kvm_arch {
struct kvm_mem_aliases *aliases;
unsigned int n_free_mmu_pages;
unsigned int n_requested_mmu_pages;

21
arch/x86/kvm/x86.c
View File

@ -2227,9 +2227,10 @@ gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn)
{
int i;
struct kvm_mem_alias *alias;
struct kvm_mem_aliases *aliases = kvm->arch.aliases;
for (i = 0; i < kvm->arch.naliases; ++i) {
alias = &kvm->arch.aliases[i];
for (i = 0; i < aliases->naliases; ++i) {
alias = &aliases->aliases[i];
if (gfn >= alias->base_gfn
&& gfn < alias->base_gfn + alias->npages)
return alias->target_gfn + gfn - alias->base_gfn;
@ -2247,6 +2248,7 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
{
int r, n;
struct kvm_mem_alias *p;
struct kvm_mem_aliases *aliases;
r = -EINVAL;
/* General sanity checks */
@ -2266,15 +2268,17 @@ static int kvm_vm_ioctl_set_memory_alias(struct kvm *kvm,
down_write(&kvm->slots_lock);
spin_lock(&kvm->mmu_lock);
p = &kvm->arch.aliases[alias->slot];
aliases = kvm->arch.aliases;
p = &aliases->aliases[alias->slot];
p->base_gfn = alias->guest_phys_addr >> PAGE_SHIFT;
p->npages = alias->memory_size >> PAGE_SHIFT;
p->target_gfn = alias->target_phys_addr >> PAGE_SHIFT;
for (n = KVM_ALIAS_SLOTS; n > 0; --n)
if (kvm->arch.aliases[n - 1].npages)
if (aliases->aliases[n - 1].npages)
break;
kvm->arch.naliases = n;
aliases->naliases = n;
spin_unlock(&kvm->mmu_lock);
kvm_mmu_zap_all(kvm);
@ -5158,6 +5162,12 @@ struct kvm *kvm_arch_create_vm(void)
if (!kvm)
return ERR_PTR(-ENOMEM);
kvm->arch.aliases = kzalloc(sizeof(struct kvm_mem_aliases), GFP_KERNEL);
if (!kvm->arch.aliases) {
kfree(kvm);
return ERR_PTR(-ENOMEM);
}
INIT_LIST_HEAD(&kvm->arch.active_mmu_pages);
INIT_LIST_HEAD(&kvm->arch.assigned_dev_head);
@ -5214,6 +5224,7 @@ void kvm_arch_destroy_vm(struct kvm *kvm)
put_page(kvm->arch.apic_access_page);
if (kvm->arch.ept_identity_pagetable)
put_page(kvm->arch.ept_identity_pagetable);
kfree(kvm->arch.aliases);
kfree(kvm);
}