x86/KVM/VMX: Replace 'vmx_l1d_flush_always' with 'vmx_l1d_flush_cond'

commit 427362a142441f08051369db6fbe7f61c73b3dca upstream

The vmx_l1d_flush_always static key is only ever evaluated if
vmx_l1d_should_flush is enabled. In that case however, there are only two
L1d flushing modes possible: "always" and "conditional".

The "conditional" mode's implementation tends to require more sophisticated
logic than the "always" mode.

Avoid inverted logic by replacing the 'vmx_l1d_flush_always' static key
with a 'vmx_l1d_flush_cond' one.

There is no change in functionality.

Signed-off-by: Nicolai Stange <nstange@suse.de>
Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index c11b7e1..785d816 100644 (file)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -192,7 +192,7 @@ module_param(ple_window_max, int, S_IRUGO);
 extern const ulong vmx_return;
 
 static DEFINE_STATIC_KEY_FALSE(vmx_l1d_should_flush);
-static DEFINE_STATIC_KEY_FALSE(vmx_l1d_flush_always);
+static DEFINE_STATIC_KEY_FALSE(vmx_l1d_flush_cond);
 static DEFINE_MUTEX(vmx_l1d_flush_mutex);
 
 /* Storage for pre module init parameter parsing */
@@ -266,10 +266,10 @@ static int vmx_setup_l1d_flush(enum vmx_l1d_flush_state l1tf)
        else
                static_branch_disable(&vmx_l1d_should_flush);
 
-       if (l1tf == VMENTER_L1D_FLUSH_ALWAYS)
-               static_branch_enable(&vmx_l1d_flush_always);
+       if (l1tf == VMENTER_L1D_FLUSH_COND)
+               static_branch_enable(&vmx_l1d_flush_cond);
        else
-               static_branch_disable(&vmx_l1d_flush_always);
+               static_branch_disable(&vmx_l1d_flush_cond);
        return 0;
 }
 
@@ -9167,7 +9167,7 @@ static void vmx_l1d_flush(struct kvm_vcpu *vcpu)
         * This code is only executed when the the flush mode is 'cond' or
         * 'always'
         */
-       if (!static_branch_unlikely(&vmx_l1d_flush_always)) {
+       if (static_branch_likely(&vmx_l1d_flush_cond)) {
                /*
                 * Clear the flush bit, it gets set again either from
                 * vcpu_run() or from one of the unsafe VMEXIT