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authorWanpeng Li <wanpengli@tencent.com>2018-02-13 09:05:40 +0800
committerRadim Krčmář <rkrcmar@redhat.com>2018-03-06 18:40:44 +0100
commita4429e53c9b3082b05e51224c3d58dbdd39306c5 (patch)
treed0fbeff12679477198902c365cb23ad6b645747c /arch/s390/include/asm/kvm_para.h
parentd4c67a7a54f12cb8d267284212f1072c95917e5a (diff)
downloadlinux-a4429e53c9b3082b05e51224c3d58dbdd39306c5.tar.bz2
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 'arch/s390/include/asm/kvm_para.h')
-rw-r--r--arch/s390/include/asm/kvm_para.h5
1 files changed, 5 insertions, 0 deletions
diff --git a/arch/s390/include/asm/kvm_para.h b/arch/s390/include/asm/kvm_para.h
index 74eeec9c0a80..cbc7c3a68e4d 100644
--- a/arch/s390/include/asm/kvm_para.h
+++ b/arch/s390/include/asm/kvm_para.h
@@ -193,6 +193,11 @@ 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_check_and_clear_guest_paused(void)
{
return false;