From d4dbf470096c51cb4785167ea59fdbdea87ccbe4 Mon Sep 17 00:00:00 2001 From: Takuya Yoshikawa Date: Tue, 7 Dec 2010 12:59:07 +0900 Subject: KVM: MMU: Make the way of accessing lpage_info more generic Large page information has two elements but one of them, write_count, alone is accessed by a helper function. This patch replaces this helper function with more generic one which returns newly named kvm_lpage_info structure and use it to access the other element rmap_pde. Signed-off-by: Takuya Yoshikawa Signed-off-by: Avi Kivity --- arch/x86/kvm/mmu.c | 54 +++++++++++++++++++++++++----------------------------- 1 file changed, 25 insertions(+), 29 deletions(-) (limited to 'arch/x86') diff --git a/arch/x86/kvm/mmu.c b/arch/x86/kvm/mmu.c index abda57fac659..475a1225f6ec 100644 --- a/arch/x86/kvm/mmu.c +++ b/arch/x86/kvm/mmu.c @@ -477,46 +477,46 @@ static void kvm_mmu_page_set_gfn(struct kvm_mmu_page *sp, int index, gfn_t gfn) } /* - * Return the pointer to the largepage write count for a given - * gfn, handling slots that are not large page aligned. + * Return the pointer to the large page information for a given gfn, + * handling slots that are not large page aligned. */ -static int *slot_largepage_idx(gfn_t gfn, - struct kvm_memory_slot *slot, - int level) +static struct kvm_lpage_info *lpage_info_slot(gfn_t gfn, + struct kvm_memory_slot *slot, + int level) { unsigned long idx; idx = (gfn >> KVM_HPAGE_GFN_SHIFT(level)) - (slot->base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); - return &slot->lpage_info[level - 2][idx].write_count; + return &slot->lpage_info[level - 2][idx]; } static void account_shadowed(struct kvm *kvm, gfn_t gfn) { struct kvm_memory_slot *slot; - int *write_count; + struct kvm_lpage_info *linfo; int i; slot = gfn_to_memslot(kvm, gfn); for (i = PT_DIRECTORY_LEVEL; i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { - write_count = slot_largepage_idx(gfn, slot, i); - *write_count += 1; + linfo = lpage_info_slot(gfn, slot, i); + linfo->write_count += 1; } } static void unaccount_shadowed(struct kvm *kvm, gfn_t gfn) { struct kvm_memory_slot *slot; - int *write_count; + struct kvm_lpage_info *linfo; int i; slot = gfn_to_memslot(kvm, gfn); for (i = PT_DIRECTORY_LEVEL; i < PT_PAGE_TABLE_LEVEL + KVM_NR_PAGE_SIZES; ++i) { - write_count = slot_largepage_idx(gfn, slot, i); - *write_count -= 1; - WARN_ON(*write_count < 0); + linfo = lpage_info_slot(gfn, slot, i); + linfo->write_count -= 1; + WARN_ON(linfo->write_count < 0); } } @@ -525,12 +525,12 @@ static int has_wrprotected_page(struct kvm *kvm, int level) { struct kvm_memory_slot *slot; - int *largepage_idx; + struct kvm_lpage_info *linfo; slot = gfn_to_memslot(kvm, gfn); if (slot) { - largepage_idx = slot_largepage_idx(gfn, slot, level); - return *largepage_idx; + linfo = lpage_info_slot(gfn, slot, level); + return linfo->write_count; } return 1; @@ -585,16 +585,15 @@ static int mapping_level(struct kvm_vcpu *vcpu, gfn_t large_gfn) static unsigned long *gfn_to_rmap(struct kvm *kvm, gfn_t gfn, int level) { struct kvm_memory_slot *slot; - unsigned long idx; + struct kvm_lpage_info *linfo; slot = gfn_to_memslot(kvm, gfn); if (likely(level == PT_PAGE_TABLE_LEVEL)) return &slot->rmap[gfn - slot->base_gfn]; - idx = (gfn >> KVM_HPAGE_GFN_SHIFT(level)) - - (slot->base_gfn >> KVM_HPAGE_GFN_SHIFT(level)); + linfo = lpage_info_slot(gfn, slot, level); - return &slot->lpage_info[level - 2][idx].rmap_pde; + return &linfo->rmap_pde; } /* @@ -882,19 +881,16 @@ static int kvm_handle_hva(struct kvm *kvm, unsigned long hva, end = start + (memslot->npages << PAGE_SHIFT); if (hva >= start && hva < end) { gfn_t gfn_offset = (hva - start) >> PAGE_SHIFT; + gfn_t gfn = memslot->base_gfn + gfn_offset; ret = handler(kvm, &memslot->rmap[gfn_offset], data); for (j = 0; j < KVM_NR_PAGE_SIZES - 1; ++j) { - unsigned long idx; - int sh; - - sh = KVM_HPAGE_GFN_SHIFT(PT_DIRECTORY_LEVEL+j); - idx = ((memslot->base_gfn+gfn_offset) >> sh) - - (memslot->base_gfn >> sh); - ret |= handler(kvm, - &memslot->lpage_info[j][idx].rmap_pde, - data); + struct kvm_lpage_info *linfo; + + linfo = lpage_info_slot(gfn, memslot, + PT_DIRECTORY_LEVEL + j); + ret |= handler(kvm, &linfo->rmap_pde, data); } trace_kvm_age_page(hva, memslot, ret); retval |= ret; -- cgit v1.2.3