KVM Xen change for 6.8: To workaround Xen guests that don't expect Xen PV clocks to be marked as being based on a stable TSC, add a Xen config knob to allow userspace to opt out of KVM setting the "TSC stable" bit in Xen PV clocks. Note, the "TSC stable" bit was added to the PVCLOCK ABI by KVM without an ack from Xen, i.e. KVM isn't entirely blameless for the buggy guest behavior.
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| @@ -1245,6 +1245,7 @@ struct kvm_x86_mce { · 1244 unmodified lines | |||
| 1245 | #define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4) | 1245 | #define KVM_XEN_HVM_CONFIG_EVTCHN_2LEVEL (1 << 4) |
| 1246 | #define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5) | 1246 | #define KVM_XEN_HVM_CONFIG_EVTCHN_SEND (1 << 5) |
| 1247 | #define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6) | 1247 | #define KVM_XEN_HVM_CONFIG_RUNSTATE_UPDATE_FLAG (1 << 6) |
| 1248 | #define KVM_XEN_HVM_CONFIG_PVCLOCK_TSC_UNSTABLE (1 << 7) | ||
| 1248 | 1249 | ||
| 1249 | struct kvm_xen_hvm_config { | 1250 | struct kvm_xen_hvm_config { |
| 1250 | __u32 flags; | 1251 | __u32 flags; |