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KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED

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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>
This commit is contained in:
Wanpeng Li
2018-02-13 09:05:40 +08:00
committed by Radim Krčmář
parent d4c67a7a54
commit a4429e53c9
9 changed files with 55 additions and 4 deletions
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5
include/linux/kvm_para.h
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@@ -9,4 +9,9 @@ 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 */