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KVM: VMX: make PLE window per-VCPU

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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: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Radim Krčmář 2014-08-21 18:08:07 +02:00 committed by Paolo Bonzini
parent ae97a3b818
commit a7653ecdf3
1 changed files with 11 additions and 1 deletions
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12
arch/x86/kvm/vmx.c
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@ -484,6 +484,10 @@ struct vcpu_vmx {
/* Support for a guest hypervisor (nested VMX) */ /* Support for a guest hypervisor (nested VMX) */
struct nested_vmx nested; struct nested_vmx nested;
/* Dynamic PLE window. */
int ple_window;
bool ple_window_dirty;
}; };
enum segment_cache_field { enum segment_cache_field {
@ -4402,7 +4406,8 @@ static int vmx_vcpu_setup(struct vcpu_vmx *vmx)
if (ple_gap) { if (ple_gap) {
vmcs_write32(PLE_GAP, 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); 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) if (vmx->emulation_required)
return; return;
if (vmx->ple_window_dirty) {
vmx->ple_window_dirty = false;
vmcs_write32(PLE_WINDOW, vmx->ple_window);
}
if (vmx->nested.sync_shadow_vmcs) { if (vmx->nested.sync_shadow_vmcs) {
copy_vmcs12_to_shadow(vmx); copy_vmcs12_to_shadow(vmx);
vmx->nested.sync_shadow_vmcs = false; vmx->nested.sync_shadow_vmcs = false;