[5/5] KVM: VMX: conditionally disable 2M pages

Commit Message

Marcelo Tosatti June 11, 2009, 2:02 p.m. UTC

Disable usage of 2M pages if VMX_EPT_2MB_PAGE_BIT (bit 16) is clear
in MSR_IA32_VMX_EPT_VPID_CAP and EPT is enabled.

Signed-off-by: Marcelo Tosatti <[e-mail]>

Patch

Index: kvm/arch/x86/kvm/vmx.c
===================================================================
--- kvm.orig/arch/x86/kvm/vmx.c
+++ kvm/arch/x86/kvm/vmx.c
@@ -1393,6 +1393,9 @@  static __init int hardware_setup(void)
 	if (!cpu_has_vmx_tpr_shadow())
 		kvm_x86_ops->update_cr8_intercept = NULL;
 
+	if (enable_ept && !cpu_has_vmx_ept_2m_page())
+		kvm_disable_largepages();
+
 	return alloc_kvm_area();
 }
 
Index: kvm/include/linux/kvm_host.h
===================================================================
--- kvm.orig/include/linux/kvm_host.h
+++ kvm/include/linux/kvm_host.h
@@ -219,6 +219,7 @@  int kvm_arch_set_memory_region(struct kv
 				struct kvm_userspace_memory_region *mem,
 				struct kvm_memory_slot old,
 				int user_alloc);
+void kvm_disable_largepages(void);
 void kvm_arch_flush_shadow(struct kvm *kvm);
 gfn_t unalias_gfn(struct kvm *kvm, gfn_t gfn);
 struct page *gfn_to_page(struct kvm *kvm, gfn_t gfn);
Index: kvm/virt/kvm/kvm_main.c
===================================================================
--- kvm.orig/virt/kvm/kvm_main.c
+++ kvm/virt/kvm/kvm_main.c
@@ -85,6 +85,8 @@  static long kvm_vcpu_ioctl(struct file *
 
 static bool kvm_rebooting;
 
+static bool largepages_disabled = false;
+
 #ifdef KVM_CAP_DEVICE_ASSIGNMENT
 static struct kvm_assigned_dev_kernel *kvm_find_assigned_dev(struct list_head *head,
 						      int assigned_dev_id)
@@ -1171,9 +1173,11 @@  int __kvm_set_memory_region(struct kvm *
 		ugfn = new.userspace_addr >> PAGE_SHIFT;
 		/*
 		 * If the gfn and userspace address are not aligned wrt each
-		 * other, disable large page support for this slot
+		 * other, or if explicitly asked to, disable large page
+		 * support for this slot
 		 */
-		if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1))
+		if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1) ||
+		    largepages_disabled)
 			for (i = 0; i < largepages; ++i)
 				new.lpage_info[i].write_count = 1;
 	}
@@ -1286,6 +1290,12 @@  out:
 	return r;
 }
 
+void kvm_disable_largepages(void)
+{
+	largepages_disabled = true;
+}
+EXPORT_SYMBOL_GPL(kvm_disable_largepages);
+
 int is_error_page(struct page *page)
 {
 	return page == bad_page;