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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> |
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appldata | ||
boot | ||
configs | ||
crypto | ||
hypfs | ||
include | ||
kernel | ||
kvm | ||
lib | ||
mm | ||
net | ||
numa | ||
oprofile | ||
pci | ||
tools | ||
defconfig | ||
Kbuild | ||
Kconfig | ||
Kconfig.debug | ||
Makefile |