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authorLongpeng(Mike) <longpeng2@huawei.com>2017-08-08 12:05:32 +0800
committerPaolo Bonzini <pbonzini@redhat.com>2017-08-08 10:57:43 +0200
commit199b5763d329b43c88f6ad539db8a6c6b42f8edb (patch)
tree224f4ebeb9e58c43ea1916e63e813452f81dd45a /arch/x86/kvm/hyperv.c
parentKVM: x86: use general helpers for some cpuid manipulation (diff)
downloadlinux-dev-199b5763d329b43c88f6ad539db8a6c6b42f8edb.tar.xz
linux-dev-199b5763d329b43c88f6ad539db8a6c6b42f8edb.zip
KVM: add spinlock optimization framework
If a vcpu exits due to request a user mode spinlock, then the spinlock-holder may be preempted in user mode or kernel mode. (Note that not all architectures trap spin loops in user mode, only AMD x86 and ARM/ARM64 currently do). But if a vcpu exits in kernel mode, then the holder must be preempted in kernel mode, so we should choose a vcpu in kernel mode as a more likely candidate for the lock holder. This introduces kvm_arch_vcpu_in_kernel() to decide whether the vcpu is in kernel-mode when it's preempted. kvm_vcpu_on_spin's new argument says the same of the spinning VCPU. Signed-off-by: Longpeng(Mike) <longpeng2@huawei.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to '')
-rw-r--r--arch/x86/kvm/hyperv.c2
1 files changed, 1 insertions, 1 deletions
diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index bf9992300efa..5243d54f73ab 100644
--- a/arch/x86/kvm/hyperv.c
+++ b/arch/x86/kvm/hyperv.c
@@ -1274,7 +1274,7 @@ int kvm_hv_hypercall(struct kvm_vcpu *vcpu)
switch (code) {
case HVCALL_NOTIFY_LONG_SPIN_WAIT:
- kvm_vcpu_on_spin(vcpu);
+ kvm_vcpu_on_spin(vcpu, false);
break;
case HVCALL_POST_MESSAGE:
case HVCALL_SIGNAL_EVENT: