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authorNicolai Stange <nstange@suse.de>2018-07-21 22:25:00 +0200
committerGreg Kroah-Hartman <gregkh@linuxfoundation.org>2018-08-15 17:37:32 +0200
commit7f29a7c2505ef69ed3f29c616e8384b06a98c01a (patch)
tree413eef7752f0c90d66feb1facb4637c3bcfbcbe4
parentd3cc70af8e59ebacaf030f3e0d0293211f170494 (diff)
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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>
-rw-r--r--arch/x86/kvm/vmx.c10
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c
index b5dbd45b5733..6d4a0c917777 100644
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -189,7 +189,7 @@ module_param(ple_window_max, uint, 0444);
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 */
@@ -263,10 +263,10 @@ 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;
}
@@ -9728,7 +9728,7 @@ 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