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| author | Radim Krčmář <rkrcmar@redhat.com> | 2014-08-21 18:08:07 +0200 |
|---|---|---|
| committer | Paolo Bonzini <pbonzini@redhat.com> | 2014-08-21 18:45:22 +0200 |
| commit | a7653ecdf34c68a1af4fc085511afcf7ff011903 (patch) | |
| tree | ad43fa8126a82ebb2ca6e37ddc240dccffa99262 | |
| parent | ae97a3b818324b92b5b9cc885c63c3f4bd46ee9d (diff) | |
| download | blackbird-op-linux-a7653ecdf34c68a1af4fc085511afcf7ff011903.tar.gz blackbird-op-linux-a7653ecdf34c68a1af4fc085511afcf7ff011903.zip | |
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: Radim Krčmář <rkrcmar@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
| -rw-r--r-- | arch/x86/kvm/vmx.c | 12 |
1 files changed, 11 insertions, 1 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 7c26533e149c..70175990536b 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -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; |
