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| author | Wanpeng Li <wanpengli@tencent.com> | 2018-02-13 09:05:40 +0800 |
|---|---|---|
| committer | Radim Krčmář <rkrcmar@redhat.com> | 2018-03-06 18:40:44 +0100 |
| commit | a4429e53c9b3082b05e51224c3d58dbdd39306c5 (patch) | |
| tree | d0fbeff12679477198902c365cb23ad6b645747c /include | |
| parent | d4c67a7a54f12cb8d267284212f1072c95917e5a (diff) | |
| download | linux-a4429e53c9b3082b05e51224c3d58dbdd39306c5.tar.gz linux-a4429e53c9b3082b05e51224c3d58dbdd39306c5.tar.bz2 linux-a4429e53c9b3082b05e51224c3d58dbdd39306c5.zip | |
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>
Diffstat (limited to 'include')
| -rw-r--r-- | include/asm-generic/kvm_para.h | 5 | ||||
| -rw-r--r-- | include/linux/kvm_para.h | 5 |
2 files changed, 10 insertions, 0 deletions
diff --git a/include/asm-generic/kvm_para.h b/include/asm-generic/kvm_para.h index 18c6abe81fbd..728e5c5706c4 100644 --- a/include/asm-generic/kvm_para.h +++ b/include/asm-generic/kvm_para.h @@ -19,6 +19,11 @@ static inline unsigned int kvm_arch_para_features(void) return 0; } +static inline unsigned int kvm_arch_para_hints(void) +{ + return 0; +} + static inline bool kvm_para_available(void) { return false; diff --git a/include/linux/kvm_para.h b/include/linux/kvm_para.h index 51f6ef2c2ff4..f23b90b02898 100644 --- a/include/linux/kvm_para.h +++ b/include/linux/kvm_para.h @@ -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 */ |