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 <mtosatti@xxxxxxxxxx>
Index: kvm/arch/x86/kvm/vmx.c
===================================================================
--- kvm.orig/arch/x86/kvm/vmx.c
+++ kvm/arch/x86/kvm/vmx.c
@@ -1369,6 +1369,9 @@ 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
@@ -203,6 +203,7 @@ 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)
@@ -1184,6 +1186,10 @@ int __kvm_set_memory_region(struct kvm *
if ((base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE - 1))
for (i = 0; i < largepages; ++i)
new.lpage_info[i].write_count = 1;
+
+ if (largepages_disabled)
+ for (i = 0; i < largepages; ++i)
+ new.lpage_info[i].write_count = 1;
}
/* Allocate page dirty bitmap if needed */
@@ -1294,6 +1300,12 @@ 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;
--
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