From 3ad82a7e874c5d6c4045090cc01d7794dd9eb21c Mon Sep 17 00:00:00 2001 From: Zhang Xiantao Date: Tue, 20 Nov 2007 13:11:38 +0800 Subject: KVM: Recalculate mmu pages needed for every memory region change 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 Signed-off-by: Avi Kivity --- drivers/kvm/mmu.c | 19 +++++++++++++++++++ 1 file changed, 19 insertions(+) (limited to 'drivers/kvm/mmu.c') diff --git a/drivers/kvm/mmu.c b/drivers/kvm/mmu.c index 4624f3789b9a..101cd5377a89 100644 --- a/drivers/kvm/mmu.c +++ b/drivers/kvm/mmu.c @@ -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; -- cgit v1.2.2