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Subject[PATCH 27/40] KVM: modify alias layout in x86s struct kvm_arch
Date
From: Marcelo Tosatti <mtosatti@redhat.com>

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

Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com>
---
arch/x86/include/asm/kvm_host.h | 8 ++++++--
arch/x86/kvm/x86.c | 21 ++++++++++++++++-----
2 files changed, 22 insertions(+), 7 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index fe4df46..7cdcb3d 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -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;
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index f8e2712..6a3593f 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -2228,9 +2228,10 @@ 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;
@@ -2248,6 +2249,7 @@ 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 */
@@ -2267,15 +2269,17 @@ 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);
@@ -5159,6 +5163,12 @@ 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);

@@ -5215,6 +5225,7 @@ 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);
}

--
1.6.5.3


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