linux-stable/include/linux/kvm_para.h
Wanpeng Li a4429e53c9 KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED
This patch introduces kvm_para_has_hint() to query for hints about
the configuration of the guests.  The first hint KVM_HINTS_DEDICATED,
is set if the guest has dedicated physical CPUs for each vCPU (i.e.
pinning and no over-commitment).  This allows optimizing spinlocks
and tells the guest to avoid PV TLB flush.

Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Radim Krčmář <rkrcmar@redhat.com>
Cc: Eduardo Habkost <ehabkost@redhat.com>
Signed-off-by: Wanpeng Li <wanpengli@tencent.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>
2018-03-06 18:40:44 +01:00

17 lines
402 B
C

/* SPDX-License-Identifier: GPL-2.0 */
#ifndef __LINUX_KVM_PARA_H
#define __LINUX_KVM_PARA_H
#include <uapi/linux/kvm_para.h>
static inline bool kvm_para_has_feature(unsigned int feature)
{
return !!(kvm_arch_para_features() & (1UL << feature));
}
static inline bool kvm_para_has_hint(unsigned int feature)
{
return !!(kvm_arch_para_hints() & (1UL << feature));
}
#endif /* __LINUX_KVM_PARA_H */