From: Brian Woods <brian.woods@amd.com>
Date: Fri, 23 Feb 2018 10:04:48 +0000 (+0100)
Subject: x86/svm: enable pause filtering threshold
X-Git-Tag: archive/raspbian/4.11.1-1+rpi1~1^2~66^2~545
X-Git-Url: https://dgit.raspbian.org/?a=commitdiff_plain;h=28e4db994903e8c10cb9bce3c133b4f3856c981a;p=xen.git

x86/svm: enable pause filtering threshold

If available, enable the pause filtering threshold feature.  See the
previous commit for more information.

Signed-off-by: Brian Woods <brian.woods@amd.com>
Reviewed-by: Babu Moger <babu.moger@amd.com>
Reviewed-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
---

diff --git a/xen/arch/x86/hvm/svm/svm.c b/xen/arch/x86/hvm/svm/svm.c
index 64d2955b22..1bc95da12c 100644
--- a/xen/arch/x86/hvm/svm/svm.c
+++ b/xen/arch/x86/hvm/svm/svm.c
@@ -1700,6 +1700,7 @@ const struct hvm_function_table * __init start_svm(void)
     P(cpu_has_svm_vloadsave, "Virtual VMLOAD/VMSAVE");
     P(cpu_has_svm_vgif, "Virtual GIF");
     P(cpu_has_pause_filter, "Pause-Intercept Filter");
+    P(cpu_has_pause_thresh, "Pause-Intercept Filter Threshold");
     P(cpu_has_tsc_ratio, "TSC Rate MSR");
 #undef P
 
diff --git a/xen/arch/x86/hvm/svm/vmcb.c b/xen/arch/x86/hvm/svm/vmcb.c
index 997e7597e0..ae60d8dc1c 100644
--- a/xen/arch/x86/hvm/svm/vmcb.c
+++ b/xen/arch/x86/hvm/svm/vmcb.c
@@ -210,6 +210,9 @@ static int construct_vmcb(struct vcpu *v)
     {
         vmcb->_pause_filter_count = SVM_PAUSEFILTER_INIT;
         vmcb->_general1_intercepts |= GENERAL1_INTERCEPT_PAUSE;
+
+        if ( cpu_has_pause_thresh )
+            vmcb->_pause_filter_thresh = SVM_PAUSETHRESH_INIT;
     }
 
     vmcb->cleanbits.bytes = 0;