c2d2a81b41
The first cpu unplug wasn't ever supported and corresponding
monitor/qmp commands refuse to unplug it. However guest is able
to issue eject request either using following command:
# echo 1 >/sys/devices/system/cpu/cpu0/firmware_node/eject
or directly writing to cpu hotplug registers, which makes
qemu crash with SIGSEGV following back trace:
kvm_flush_coalesced_mmio_buffer ()
while (ring->first != ring->last)
...
qemu_flush_coalesced_mmio_buffer
prepare_mmio_access
flatview_read_continue
flatview_read
address_space_read_full
address_space_rw
kvm_cpu_exec(cpu!0)
qemu_kvm_cpu_thread_fn
the reason for which is that ring == KVMState::coalesced_mmio_ring
happens to be a part of 1st CPU that was uplugged by guest.
Fix it by forbidding 1st cpu unplug from guest side and in addition
remove CPU0._EJ0 ACPI method to make clear that unplug of the first
CPU is not supported.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
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|---|---|---|
| .. | ||
| acpi-stub.c | ||
| acpi_interface.c | ||
| aml-build.c | ||
| bios-linker-loader.c | ||
| core.c | ||
| cpu.c | ||
| cpu_hotplug.c | ||
| ich9.c | ||
| ipmi-stub.c | ||
| ipmi.c | ||
| Makefile.objs | ||
| memory_hotplug.c | ||
| nvdimm.c | ||
| pcihp.c | ||
| piix4.c | ||
| tco.c | ||
| trace-events | ||
| vmgenid.c | ||