From a4429e53c9b3082b05e51224c3d58dbdd39306c5 Mon Sep 17 00:00:00 2001 From: Wanpeng Li Date: Tue, 13 Feb 2018 09:05:40 +0800 Subject: KVM: Introduce paravirtualization hints and KVM_HINTS_DEDICATED MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit 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 Cc: Radim Krčmář Cc: Eduardo Habkost Signed-off-by: Wanpeng Li Signed-off-by: Paolo Bonzini Signed-off-by: Radim Krčmář --- include/linux/kvm_para.h | 5 +++++ 1 file changed, 5 insertions(+) (limited to 'include/linux') 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 */ -- cgit v1.2.3 From 5a485803221777013944cbd1a7cd5c62efba3ffa Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Tue, 20 Mar 2018 15:02:05 +0100 Subject: x86/hyper-v: move hyperv.h out of uapi MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit hyperv.h is not part of uapi, there are no (known) users outside of kernel. We are making changes to this file to match current Hyper-V Hypervisor Top-Level Functional Specification (TLFS, see: https://docs.microsoft.com/en-us/virtualization/hyper-v-on-windows/reference/tlfs) and we don't want to maintain backwards compatibility. Move the file renaming to hyperv-tlfs.h to avoid confusing it with mshyperv.h. In future, all definitions from TLFS should go to it and all kernel objects should go to mshyperv.h or include/linux/hyperv.h. Signed-off-by: Vitaly Kuznetsov Acked-by: Thomas Gleixner Signed-off-by: Radim Krčmář --- include/linux/hyperv.h | 1 - 1 file changed, 1 deletion(-) (limited to 'include/linux') diff --git a/include/linux/hyperv.h b/include/linux/hyperv.h index 93bd6fcd6e62..eed8b33b0173 100644 --- a/include/linux/hyperv.h +++ b/include/linux/hyperv.h @@ -26,7 +26,6 @@ #define _HYPERV_H #include -#include #include #include -- cgit v1.2.3