[PATCH v4 2/6] KVM: MMU: introduce gfn_to_page_many_atomic() function
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From: Xiao Guangrong on 1 Jul 2010 10:00 This function not only return the gfn's page but also the page number after @gfn in the slot Signed-off-by: Xiao Guangrong <xiaoguangrong(a)cn.fujitsu.com> --- include/linux/kvm_host.h | 2 ++ virt/kvm/kvm_main.c | 29 ++++++++++++++++++++++++++++- 2 files changed, 30 insertions(+), 1 deletions(-) diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h index e0fb543..53f663c 100644 --- a/include/linux/kvm_host.h +++ b/include/linux/kvm_host.h @@ -288,6 +288,8 @@ void kvm_arch_commit_memory_region(struct kvm *kvm, void kvm_disable_largepages(void); void kvm_arch_flush_shadow(struct kvm *kvm); +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, + struct page **pages, int nr_pages, bool *enough); struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn); unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn); void kvm_release_page_clean(struct page *page); diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c index 3f976b0..cc360d7 100644 --- a/virt/kvm/kvm_main.c +++ b/virt/kvm/kvm_main.c @@ -923,15 +923,25 @@ static unsigned long gfn_to_hva_memslot(struct kvm_memory_slot *slot, gfn_t gfn) return slot->userspace_addr + (gfn - slot->base_gfn) * PAGE_SIZE; } -unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +static unsigned long gfn_to_hva_many(struct kvm *kvm, gfn_t gfn, int *entry) { struct kvm_memory_slot *slot; slot = gfn_to_memslot(kvm, gfn); + if (!slot || slot->flags & KVM_MEMSLOT_INVALID) return bad_hva(); + + if (entry) + *entry = slot->npages - (gfn - slot->base_gfn); + return gfn_to_hva_memslot(slot, gfn); } + +unsigned long gfn_to_hva(struct kvm *kvm, gfn_t gfn) +{ + return gfn_to_hva_many(kvm, gfn, NULL); +} EXPORT_SYMBOL_GPL(gfn_to_hva); static pfn_t hva_to_pfn(struct kvm *kvm, unsigned long addr, bool atomic) @@ -1011,6 +1021,23 @@ pfn_t gfn_to_pfn_memslot(struct kvm *kvm, return hva_to_pfn(kvm, addr, false); } +int gfn_to_page_many_atomic(struct kvm *kvm, gfn_t gfn, + struct page **pages, int nr_pages, bool *enough) +{ + unsigned long addr; + int entry, ret; + + addr = gfn_to_hva_many(kvm, gfn, &entry); + if (kvm_is_error_hva(addr)) + return -1; + + entry = min(entry, nr_pages); + *enough = (entry == nr_pages) ? true : false; + ret = __get_user_pages_fast(addr, entry, 1, pages); + return ret; +} +EXPORT_SYMBOL_GPL(gfn_to_page_many_atomic); + struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn) { pfn_t pfn; -- 1.6.1.2 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo(a)vger.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/ |