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Commit a7653ecd authored by Radim Krčmář's avatar Radim Krčmář Committed by Paolo Bonzini
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KVM: VMX: make PLE window per-VCPU 



Change PLE window into per-VCPU variable, seeded from module parameter,
to allow greater flexibility.

Brings in a small overhead on every vmentry.

Signed-off-by: default avatarRadim Krčmář <rkrcmar@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent ae97a3b8

arch/x86/kvm/vmx.c

+11 −1
Original line number Diff line number Diff line
@@ -484,6 +484,10 @@ struct vcpu_vmx { 


	/* Support for a guest hypervisor (nested VMX) */

	struct nested_vmx nested;



	/* Dynamic PLE window. */

	int ple_window;

	bool ple_window_dirty;

};



enum segment_cache_field {
@@ -4402,7 +4406,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx) 


	if (ple_gap) {

		vmcs_write32(PLE_GAP, ple_gap);

		vmcs_write32(PLE_WINDOW, ple_window);

		vmx->ple_window = ple_window;

		vmx->ple_window_dirty = true;

	}



	vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
@@ -7389,6 +7394,11 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu) 
	if (vmx->emulation_required)

		return;



	if (vmx->ple_window_dirty) {

		vmx->ple_window_dirty = false;

		vmcs_write32(PLE_WINDOW, vmx->ple_window);

	}



	if (vmx->nested.sync_shadow_vmcs) {

		copy_vmcs12_to_shadow(vmx);

		vmx->nested.sync_shadow_vmcs = false;