diff options
| author | Nicolai Stange <nstange@suse.de> | 2018-07-21 22:25:00 +0200 |
|---|---|---|
| committer | Greg Kroah-Hartman <gregkh@linuxfoundation.org> | 2018-08-15 18:14:51 +0200 |
| commit | 936f566260c2ae883e41301edafa1afb2ba11241 (patch) | |
| tree | c4e1f1ae5082fa5cf88bd43c6a09cdabb58c2f5b /arch/x86 | |
| parent | 698ac1bc17c413fd340c243d64fb15cbaadf7178 (diff) | |
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: David Woodhouse <dwmw@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
Diffstat (limited to 'arch/x86')
| -rw-r--r-- | arch/x86/kvm/vmx.c | 10 |
1 files changed, 5 insertions, 5 deletions
diff --git a/arch/x86/kvm/vmx.c b/arch/x86/kvm/vmx.c index 0b2dd1463f0c..796c4eb2cd8f 100644 --- a/arch/x86/kvm/vmx.c +++ b/arch/x86/kvm/vmx.c @@ -190,7 +190,7 @@ 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 */ @@ -264,10 +264,10 @@ 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; } @@ -8666,7 +8666,7 @@ 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 |