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KVM: Recalculate mmu pages needed for every memory region change

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Instead of incrementally changing the mmu cache size for every memory slot
operation, recalculate it from scratch.  This is simpler and safer.

Signed-off-by: Zhang Xiantao <xiantao.zhang@intel.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Zhang Xiantao 2007-11-20 13:11:38 +08:00 committed by Avi Kivity
parent 6226686954
commit 3ad82a7e87
3 changed files with 25 additions and 18 deletions
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23
drivers/kvm/kvm_main.c
View File

@ -333,26 +333,13 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (mem->slot >= kvm->nmemslots)
kvm->nmemslots = mem->slot + 1;
if (!kvm->n_requested_mmu_pages) {
unsigned int n_pages;
if (npages) {
n_pages = npages * KVM_PERMILLE_MMU_PAGES / 1000;
kvm_mmu_change_mmu_pages(kvm, kvm->n_alloc_mmu_pages +
n_pages);
} else {
unsigned int nr_mmu_pages;
n_pages = old.npages * KVM_PERMILLE_MMU_PAGES / 1000;
nr_mmu_pages = kvm->n_alloc_mmu_pages - n_pages;
nr_mmu_pages = max(nr_mmu_pages,
(unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
}
}
*memslot = new;
if (!kvm->n_requested_mmu_pages) {
unsigned int nr_mmu_pages = kvm_mmu_calculate_mmu_pages(kvm);
kvm_mmu_change_mmu_pages(kvm, nr_mmu_pages);
}
kvm_mmu_slot_remove_write_access(kvm, mem->slot);
kvm_flush_remote_tlbs(kvm);

19
drivers/kvm/mmu.c
View File

@ -1535,6 +1535,25 @@ nomem:
return -ENOMEM;
}
/*
* Caculate mmu pages needed for kvm.
*/
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm)
{
int i;
unsigned int nr_mmu_pages;
unsigned int nr_pages = 0;
for (i = 0; i < kvm->nmemslots; i++)
nr_pages += kvm->memslots[i].npages;
nr_mmu_pages = nr_pages * KVM_PERMILLE_MMU_PAGES / 1000;
nr_mmu_pages = max(nr_mmu_pages,
(unsigned int) KVM_MIN_ALLOC_MMU_PAGES);
return nr_mmu_pages;
}
#ifdef AUDIT
static const char *audit_msg;

1
drivers/kvm/x86.h
View File

@ -236,6 +236,7 @@ void kvm_mmu_set_nonpresent_ptes(u64 trap_pte, u64 notrap_pte);
int kvm_mmu_reset_context(struct kvm_vcpu *vcpu);
void kvm_mmu_slot_remove_write_access(struct kvm *kvm, int slot);
void kvm_mmu_zap_all(struct kvm *kvm);
unsigned int kvm_mmu_calculate_mmu_pages(struct kvm *kvm);
void kvm_mmu_change_mmu_pages(struct kvm *kvm, unsigned int kvm_nr_mmu_pages);
enum emulation_result {