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KVM doesn't fully support Hyper-V reenlightenment notifications on migration. In particular, it doesn't support emulating TSC frequency of the source host by trapping all TSC accesses so unless TSC scaling is supported on the destination host and KVM_SET_TSC_KHZ succeeds, it is unsafe to proceed with migration. KVM_SET_TSC_KHZ is called from two sites: kvm_arch_init_vcpu() and kvm_arch_put_registers(). The later (intentionally) doesn't propagate errors allowing migrations to succeed even when TSC scaling is not supported on the destination. This doesn't suit 're-enlightenment' use-case as we have to guarantee that TSC frequency stays constant. Require 'tsc-frequency=' command line option to be specified for successful migration when re-enlightenment was enabled by the guest. Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com> Message-Id: <20210319123801.1111090-1-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com> |
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| .. | ||
| _templates | ||
| config | ||
| devel | ||
| interop | ||
| specs | ||
| sphinx | ||
| spin | ||
| system | ||
| tools | ||
| user | ||
| amd-memory-encryption.txt | ||
| barrier.txt | ||
| block-replication.txt | ||
| bootindex.txt | ||
| can.txt | ||
| ccid.txt | ||
| COLO-FT.txt | ||
| colo-proxy.txt | ||
| conf.py | ||
| confidential-guest-support.txt | ||
| defs.rst.inc | ||
| hyperv.txt | ||
| igd-assign.txt | ||
| image-fuzzer.txt | ||
| index.rst | ||
| memory-hotplug.txt | ||
| meson.build | ||
| multi-thread-compression.txt | ||
| multiseat.txt | ||
| nvdimm.txt | ||
| papr-pef.txt | ||
| pci_expander_bridge.txt | ||
| pcie.txt | ||
| pcie_pci_bridge.txt | ||
| pvrdma.txt | ||
| qcow2-cache.txt | ||
| qdev-device-use.txt | ||
| qemu-option-trace.rst.inc | ||
| qemu_logo.pdf | ||
| qemupciserial.inf | ||
| rdma.txt | ||
| replay.txt | ||
| spice-port-fqdn.txt | ||
| throttle.txt | ||
| u2f.txt | ||
| usb-storage.txt | ||
| usb2.txt | ||
| virtio-balloon-stats.txt | ||
| xbzrle.txt | ||
| xen-save-devices-state.txt | ||