From: Wanpeng Li <wanpeng.li@hotmail.com>
Date: Fri, 29 Sep 2017 01:06:24 +0000 (-0700)
Subject: KVM: VMX: Don't expose PLE enable if there is no hardware support
X-Git-Tag: v4.15-rc1~79^2~44
X-Git-Url: https://asedeno.scripts.mit.edu/gitweb/?a=commitdiff_plain;h=0f107682cb0398265d80237c353a6fa93161d219;p=linux.git

KVM: VMX: Don't expose PLE enable if there is no hardware support

KVM doesn't expose the PLE capability to the L1 hypervisor, however,
ple_window still shows the default value on L1 hypervisor. This patch
fixes it by clearing all the PLE related module parameter if there is
no PLE capability.

Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Wanpeng Li <wanpeng.li@hotmail.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
---

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index 95a01609d7ee..941185e0606b 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -6779,8 +6779,13 @@ static __init int hardware_setup(void)
 	if (enable_ept && !cpu_has_vmx_ept_2m_page())
 		kvm_disable_largepages();
 
-	if (!cpu_has_vmx_ple())
+	if (!cpu_has_vmx_ple()) {
 		ple_gap = 0;
+		ple_window = 0;
+		ple_window_grow = 0;
+		ple_window_max = 0;
+		ple_window_shrink = 0;
+	}
 
 	if (!cpu_has_vmx_apicv()) {
 		enable_apicv = 0;