| Message ID | 20241004140810.34231-5-nikwip@amazon.de (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | KVM: x86: Introduce new ioctl KVM_HYPERV_SET_TLB_FLUSH_INHIBIT | expand |
Nikolas Wipper <nikwip@amazon.de> writes: > Introduce a new ioctl to control whether remote flushing via Hyper-V > hyper-calls should be allowed on a vCPU. When the tlb_flush_inhibit bit is > set, vCPUs attempting to flush the TLB of the inhibitied vCPU will be > suspended until the bit is clearded. > > Signed-off-by: Nikolas Wipper <nikwip@amazon.de> > --- > include/uapi/linux/kvm.h | 15 +++++++++++++++ I guess we can merge this patch with documentation (PATCH1) or even implementation (PATCH5) as I don't see why separation helps here. > 1 file changed, 15 insertions(+) > > diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h > index 637efc055145..3bc43fdcab88 100644 > --- a/include/uapi/linux/kvm.h > +++ b/include/uapi/linux/kvm.h > @@ -933,6 +933,7 @@ struct kvm_enable_cap { > #define KVM_CAP_PRE_FAULT_MEMORY 236 > #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237 > #define KVM_CAP_X86_GUEST_MODE 238 > +#define KVM_CAP_HYPERV_TLB_FLUSH_INHIBIT 239 > > struct kvm_irq_routing_irqchip { > __u32 irqchip; > @@ -1573,4 +1574,18 @@ struct kvm_pre_fault_memory { > __u64 padding[5]; > }; > > +/* Available with KVM_CAP_HYPERV_TLBFLUSH */ > +#define KVM_HYPERV_SET_TLB_FLUSH_INHIBIT \ > + _IOW(KVMIO, 0xd6, struct kvm_hyperv_tlb_flush_inhibit) > + > +/* for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT */ > +struct kvm_hyperv_tlb_flush_inhibit { > + /* in */ > + __u16 flags; > +#define KVM_HYPERV_UNINHIBIT_TLB_FLUSH 0 > +#define KVM_HYPERV_INHIBIT_TLB_FLUSH 1 > + __u8 inhibit; > + __u8 reserved[5]; > +}; > + > #endif /* __LINUX_KVM_H */
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h index 637efc055145..3bc43fdcab88 100644 --- a/include/uapi/linux/kvm.h +++ b/include/uapi/linux/kvm.h @@ -933,6 +933,7 @@ struct kvm_enable_cap { #define KVM_CAP_PRE_FAULT_MEMORY 236 #define KVM_CAP_X86_APIC_BUS_CYCLES_NS 237 #define KVM_CAP_X86_GUEST_MODE 238 +#define KVM_CAP_HYPERV_TLB_FLUSH_INHIBIT 239 struct kvm_irq_routing_irqchip { __u32 irqchip; @@ -1573,4 +1574,18 @@ struct kvm_pre_fault_memory { __u64 padding[5]; }; +/* Available with KVM_CAP_HYPERV_TLBFLUSH */ +#define KVM_HYPERV_SET_TLB_FLUSH_INHIBIT \ + _IOW(KVMIO, 0xd6, struct kvm_hyperv_tlb_flush_inhibit) + +/* for KVM_HYPERV_SET_TLB_FLUSH_INHIBIT */ +struct kvm_hyperv_tlb_flush_inhibit { + /* in */ + __u16 flags; +#define KVM_HYPERV_UNINHIBIT_TLB_FLUSH 0 +#define KVM_HYPERV_INHIBIT_TLB_FLUSH 1 + __u8 inhibit; + __u8 reserved[5]; +}; + #endif /* __LINUX_KVM_H */
Introduce a new ioctl to control whether remote flushing via Hyper-V hyper-calls should be allowed on a vCPU. When the tlb_flush_inhibit bit is set, vCPUs attempting to flush the TLB of the inhibitied vCPU will be suspended until the bit is clearded. Signed-off-by: Nikolas Wipper <nikwip@amazon.de> --- include/uapi/linux/kvm.h | 15 +++++++++++++++ 1 file changed, 15 insertions(+)