It is used to set disallowed large page on the specified level, can be used in later patch
Signed-off-by: Xiao Guangrong <xiaoguangr...@linux.vnet.ibm.com> --- arch/x86/kvm/x86.c | 53 ++++++++++++++++++++++++++++++++++----------------- 1 files changed, 35 insertions(+), 18 deletions(-) diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 91dd9f4..52b4e97 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -6917,12 +6917,45 @@ void kvm_arch_free_memslot(struct kvm_memory_slot *free, } } +static void memslot_set_lpage_disallowed(struct kvm_memory_slot *slot, + unsigned long npages, + int lpage_size, int lpages) +{ + struct kvm_lpage_info *lpage_info; + unsigned long ugfn; + int level = lpage_size + 1; + + WARN_ON(!lpage_size); + + lpage_info = slot->arch.lpage_info[lpage_size - 1]; + + if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) + lpage_info[0].write_count = 1; + + if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) + lpage_info[lpages - 1].write_count = 1; + + ugfn = slot->userspace_addr >> PAGE_SHIFT; + + /* + * If the gfn and userspace address are not aligned wrt each + * other, or if explicitly asked to, disable large page + * support for this slot + */ + if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || + !kvm_largepages_enabled()) { + unsigned long j; + + for (j = 0; j < lpages; ++j) + lpage_info[j].write_count = 1; + } +} + int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) { int i; for (i = 0; i < KVM_NR_PAGE_SIZES; ++i) { - unsigned long ugfn; int lpages; int level = i + 1; @@ -6941,23 +6974,7 @@ int kvm_arch_create_memslot(struct kvm_memory_slot *slot, unsigned long npages) if (!slot->arch.lpage_info[i - 1]) goto out_free; - if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i - 1][0].write_count = 1; - if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1)) - slot->arch.lpage_info[i - 1][lpages - 1].write_count = 1; - ugfn = slot->userspace_addr >> PAGE_SHIFT; - /* - * If the gfn and userspace address are not aligned wrt each - * other, or if explicitly asked to, disable large page - * support for this slot - */ - if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) || - !kvm_largepages_enabled()) { - unsigned long j; - - for (j = 0; j < lpages; ++j) - slot->arch.lpage_info[i - 1][j].write_count = 1; - } + memslot_set_lpage_disallowed(slot, npages, i, lpages); } return 0; -- 1.7.7.6 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majord...@vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/