4.9-stable review patch. If anyone has any objections, please let me know.
------------------
From: Nicolai Stange <nsta...@suse.de>
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 <nsta...@suse.de>
Signed-off-by: Thomas Gleixner <t...@linutronix.de>
Signed-off-by: David Woodhouse <d...@amazon.co.uk>
Signed-off-by: Greg Kroah-Hartman <gre...@linuxfoundation.org>
---
arch/x86/kvm/vmx.c | 10 +++++-----
1 file changed, 5 insertions(+), 5 deletions(-)
--- a/arch/x86/kvm/vmx.c
+++ b/arch/x86/kvm/vmx.c
@@ -190,7 +190,7 @@ module_param(ple_window_max, int, S_IRUG
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_
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_vcp
* 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
