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authorTakuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp>2012-02-08 13:00:13 +0900
committerAvi Kivity <avi@redhat.com>2012-03-08 14:10:20 +0200
commita64f273a08d16bc66ccc5546bd28b1bba554ec81 (patch)
treeaf305dee1d5c6c2fed1e6c913a18c4f43e16940a /virt
parentfb03cb6f44236f4bef62a0dda8e025ff5ca51417 (diff)
downloadlinux-a64f273a08d16bc66ccc5546bd28b1bba554ec81.tar.gz
KVM: Split lpage_info creation out from __kvm_set_memory_region()
This makes it easy to make lpage_info architecture specific. Signed-off-by: Takuya Yoshikawa <yoshikawa.takuya@oss.ntt.co.jp> Signed-off-by: Marcelo Tosatti <mtosatti@redhat.com> Signed-off-by: Avi Kivity <avi@redhat.com>
Diffstat (limited to 'virt')
-rw-r--r--virt/kvm/kvm_main.c83
1 files changed, 52 insertions, 31 deletions
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index 415fe816fc1..7adaa206341 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -685,6 +685,56 @@ void update_memslots(struct kvm_memslots *slots, struct kvm_memory_slot *new)
slots->generation++;
}
+#ifndef CONFIG_S390
+static int create_lpage_info(struct kvm_memory_slot *slot, unsigned long npages)
+{
+ int i;
+
+ for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+ unsigned long ugfn;
+ int lpages;
+ int level = i + 2;
+
+ if (slot->lpage_info[i])
+ continue;
+
+ lpages = gfn_to_index(slot->base_gfn + npages - 1,
+ slot->base_gfn, level) + 1;
+
+ slot->lpage_info[i] = vzalloc(lpages * sizeof(*slot->lpage_info[i]));
+ if (!slot->lpage_info[i])
+ goto out_free;
+
+ if (slot->base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
+ slot->lpage_info[i][0].write_count = 1;
+ if ((slot->base_gfn + npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
+ slot->lpage_info[i][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) ||
+ !largepages_enabled) {
+ unsigned long j;
+
+ for (j = 0; j < lpages; ++j)
+ slot->lpage_info[i][j].write_count = 1;
+ }
+ }
+
+ return 0;
+
+out_free:
+ for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
+ vfree(slot->lpage_info[i]);
+ slot->lpage_info[i] = NULL;
+ }
+ return -ENOMEM;
+}
+#endif /* not defined CONFIG_S390 */
+
/*
* Allocate some memory and give it an address in the guest physical address
* space.
@@ -778,37 +828,8 @@ int __kvm_set_memory_region(struct kvm *kvm,
if (!npages)
goto skip_lpage;
- for (i = 0; i < KVM_NR_PAGE_SIZES - 1; ++i) {
- unsigned long ugfn;
- unsigned long j;
- int lpages;
- int level = i + 2;
-
- if (new.lpage_info[i])
- continue;
-
- lpages = gfn_to_index(base_gfn + npages - 1, base_gfn, level) + 1;
-
- new.lpage_info[i] = vzalloc(lpages * sizeof(*new.lpage_info[i]));
-
- if (!new.lpage_info[i])
- goto out_free;
-
- if (base_gfn & (KVM_PAGES_PER_HPAGE(level) - 1))
- new.lpage_info[i][0].write_count = 1;
- if ((base_gfn+npages) & (KVM_PAGES_PER_HPAGE(level) - 1))
- new.lpage_info[i][lpages - 1].write_count = 1;
- ugfn = new.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 ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
- !largepages_enabled)
- for (j = 0; j < lpages; ++j)
- new.lpage_info[i][j].write_count = 1;
- }
+ if (create_lpage_info(&new, npages))
+ goto out_free;
skip_lpage: