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    Subject[PATCH v3 3/7] KVM: VMX: make PLE window per-VCPU
    Date
    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>
    ---
    arch/x86/kvm/vmx.c | 8 +++++++-
    1 file changed, 7 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
    index 2b306f9..18e0e52 100644
    --- a/arch/x86/kvm/vmx.c
    +++ b/arch/x86/kvm/vmx.c
    @@ -484,6 +484,9 @@ struct vcpu_vmx {

    /* Support for a guest hypervisor (nested VMX) */
    struct nested_vmx nested;
    +
    + /* Dynamic PLE window. */
    + int ple_window;
    };

    enum segment_cache_field {
    @@ -4402,7 +4405,7 @@ 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;
    }

    vmcs_write32(PAGE_FAULT_ERROR_CODE_MASK, 0);
    @@ -7387,6 +7390,9 @@ static void __noclone vmx_vcpu_run(struct kvm_vcpu *vcpu)
    if (vmx->emulation_required)
    return;

    + if (ple_gap)
    + vmcs_write32(PLE_WINDOW, vmx->ple_window);
    +
    if (vmx->nested.sync_shadow_vmcs) {
    copy_vmcs12_to_shadow(vmx);
    vmx->nested.sync_shadow_vmcs = false;
    --
    2.1.0
    --
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