diff options
| author | Igor Mammedov | 2020-09-23 11:46:42 +0200 |
|---|---|---|
| committer | Michael S. Tsirkin | 2020-09-29 08:15:24 +0200 |
| commit | b48ad7c02ba77c151bb8b10db6418615fa4ff458 (patch) | |
| tree | 5584208ca749f4acef97ac59e89db1e20db3e95b /include/hw/acpi | |
| parent | x86: cpuhp: prevent guest crash on CPU hotplug when broadcast SMI is in use (diff) | |
| download | qemu-b48ad7c02ba77c151bb8b10db6418615fa4ff458.tar.gz qemu-b48ad7c02ba77c151bb8b10db6418615fa4ff458.tar.xz qemu-b48ad7c02ba77c151bb8b10db6418615fa4ff458.zip | |
x86: cpuhp: refuse cpu hot-unplug request earlier if not supported
CPU hot-unplug with SMM requires firmware participation to prevent
guest crash (i.e. CPU can be removed only after OS _and_ firmware
were prepared for the action).
Previous patches introduced ICH9_LPC_SMI_F_CPU_HOT_UNPLUG_BIT
feature bit, which is advertised by firmware when it has support
for CPU hot-unplug. Use it to check if guest is able to handle
unplug and make device_del fail gracefully if hot-unplug feature
hasn't been negotiated.
Signed-off-by: Igor Mammedov <imammedo@redhat.com>
Tested-by: Laszlo Ersek <lersek@redhat.com>
Reviewed-by: Laszlo Ersek <lersek@redhat.com>
Message-Id: <20200923094650.1301166-4-imammedo@redhat.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Diffstat (limited to 'include/hw/acpi')
0 files changed, 0 insertions, 0 deletions