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@xxxxxxxxx>
---
include/uapi/linux/kvm.h | 15 +++++++++++++++
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 */
--
2.40.1
Amazon Web Services Development Center Germany GmbH
Krausenstr. 38
10117 Berlin
Geschaeftsfuehrung: Christian Schlaeger, Jonathan Weiss
Eingetragen am Amtsgericht Charlottenburg unter HRB 257764 B
Sitz: Berlin
Ust-ID: DE 365 538 597
