[PATCH v2 61/66] KVM: x86: Don't propagate MMU lpage support to memslot.disallow_lpage

Sean Christopherson
2020-03-02T23:59:33Z

Stop propagating MMU large page support into a memslot's disallow_lpage
now that the MMU's max_page_level handles the scenario where VMX's EPT is
enabled and EPT doesn't support 2M pages.

No functional change intended.

Reviewed-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 3 ---
arch/x86/kvm/x86.c | 6 ++----
2 files changed, 2 insertions(+), 7 deletions(-)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f8eb081b63fe..1fbe54dc3263 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7698,9 +7698,6 @@ 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();
-
#if IS_ENABLED(CONFIG_HYPERV)
if (ms_hyperv.nested_features & HV_X64_NESTED_GUEST_MAPPING_FLUSH
&& enable_ept) {
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 4fdf5b04f148..cc9b543d210b 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -9863,11 +9863,9 @@ static int kvm_alloc_memslot_metadata(struct kvm_memory_slot *slot,
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
+ * other, disable large page support for this slot.
*/
- if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1) ||
- !kvm_largepages_enabled()) {
+ if ((slot->base_gfn ^ ugfn) & (KVM_PAGES_PER_HPAGE(level) - 1)) {
unsigned long j;

for (j = 0; j < lpages; ++j)
--
2.24.1