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KVM: Allow dynamic allocation of the mmu shadow cache size

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The user is now able to set how many mmu pages will be allocated to the guest.

Signed-off-by: Izik Eidus <izike@qumranet.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Izik Eidus
2007-10-02 18:52:55 +02:00
committed by Avi Kivity
parent 195aefde9c
commit 82ce2c9683
4 changed files with 94 additions and 3 deletions
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drivers/kvm/mmu.c
+38 -2
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@@ -747,6 +747,40 @@ static void kvm_mmu_zap_page(struct kvm *kvm,
kvm_mmu_reset_last_pte_updated(kvm);
}
/*
* Changing the number of mmu pages allocated to the vm
* Note: if kvm_nr_mmu_pages is too small, you will get dead lock
*/
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages)
{
/*
* If we set the number of mmu pages to be smaller be than the
* number of actived pages , we must to free some mmu pages before we
* change the value
*/
if ((kvm->n_alloc_mmu_pages - kvm->n_free_mmu_pages) >
kvm_nr_mmu_pages) {
int n_used_mmu_pages = kvm->n_alloc_mmu_pages
- kvm->n_free_mmu_pages;
while (n_used_mmu_pages > kvm_nr_mmu_pages) {
struct kvm_mmu_page *page;
page = container_of(kvm->active_mmu_pages.prev,
struct kvm_mmu_page, link);
kvm_mmu_zap_page(kvm, page);
n_used_mmu_pages--;
}
kvm->n_free_mmu_pages = 0;
}
else
kvm->n_free_mmu_pages += kvm_nr_mmu_pages
- kvm->n_alloc_mmu_pages;
kvm->n_alloc_mmu_pages = kvm_nr_mmu_pages;
}
static int kvm_mmu_unprotect_page(struct kvm_vcpu *vcpu, gfn_t gfn)
{
unsigned index;
@@ -1297,8 +1331,10 @@ static int alloc_mmu_pages(struct kvm_vcpu *vcpu)
ASSERT(vcpu);
vcpu->kvm->n_free_mmu_pages = KVM_NUM_MMU_PAGES;
if (vcpu->kvm->n_requested_mmu_pages)
vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_requested_mmu_pages;
else
vcpu->kvm->n_free_mmu_pages = vcpu->kvm->n_alloc_mmu_pages;
/*
* When emulating 32-bit mode, cr3 is only 32 bits even on x86_64.
* Therefore we need to allocate shadow page tables in the first