qemu/accel/kvm
William Roche 06152b89db migration: prevent migration when VM has poisoned memory
A memory page poisoned from the hypervisor level is no longer readable.
The migration of a VM will crash Qemu when it tries to read the
memory address space and stumbles on the poisoned page with a similar
stack trace:

Program terminated with signal SIGBUS, Bus error.
#0  _mm256_loadu_si256
#1  buffer_zero_avx2
#2  select_accel_fn
#3  buffer_is_zero
#4  save_zero_page
#5  ram_save_target_page_legacy
#6  ram_save_host_page
#7  ram_find_and_save_block
#8  ram_save_iterate
#9  qemu_savevm_state_iterate
#10 migration_iteration_run
#11 migration_thread
#12 qemu_thread_start

To avoid this VM crash during the migration, prevent the migration
when a known hardware poison exists on the VM.

Signed-off-by: William Roche <william.roche@oracle.com>
Link: https://lore.kernel.org/r/20240130190640.139364-2-william.roche@oracle.com
Signed-off-by: Peter Xu <peterx@redhat.com>
2024-02-05 14:41:58 +08:00
..
kvm-accel-ops.c accel: Do not set CPUState::can_do_io in non-TCG accels 2024-01-19 12:28:59 +01:00
kvm-all.c migration: prevent migration when VM has poisoned memory 2024-02-05 14:41:58 +08:00
kvm-cpus.h gdbstub: Use vaddr type for generic insert/remove_breakpoint() API 2023-02-27 22:29:01 +01:00
meson.build target/i386/kvm: Restrict SEV stubs to x86 architecture 2021-10-13 10:47:49 +02:00
trace-events accel/kvm: Turn DPRINTF macro use into tracepoints 2023-12-23 19:39:35 +03:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00