qemu/hw/isa
Isaku Yamahata 6be8cf56bc acpi/core: always set SCI_EN when SMM isn't supported
If SMM is not supported, ACPI fixed hardware doesn't support
legacy-mode. ACPI-only platform. Where SCI_EN in PM1_CNT register is
always set.
The bit tells OS legacy mode(SCI_EN cleared) or ACPI mode(SCI_EN set).

With the next patch (setting fadt.smi_cmd = 0 when smm isn't enabled),
guest Linux tries to switch to ACPI mode, finds smi_cmd = 0, and then
fails to initialize acpi subsystem. This patch proactively fixes it.

This patch changes guest ABI. To keep compatibility, use
"smm-compat" introduced by earlier patch. If the property is true,
disable new behavior.

ACPI spec 4.8.10.1 PM1 Event Grouping
PM1 Eanble Registers
> For ACPI-only platforms (where SCI_EN is always set)

Reviewed-by: Igor Mammedov <imammedo@redhat.com>
Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Message-Id: <500f62081626997e46f96377393d3662211763a8.1613615732.git.isaku.yamahata@intel.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
2021-02-23 10:58:42 -05:00
..
apm.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
i82378.c prep: Fix Lesser GPL version number 2020-11-15 16:39:29 +01:00
isa-bus.c nomaintainer: Fix Lesser GPL version number 2020-11-15 17:04:40 +01:00
isa-superio.c hw/isa/isa-superio: Fix IDE controller realization 2020-09-01 09:02:37 +02:00
Kconfig hw/input: Do not enable CONFIG_PCKBD by default 2020-02-04 09:01:31 +01:00
lpc_ich9.c ich9, piix4: add property, smm-compat, to keep compatibility of SMM 2021-02-23 10:58:42 -05:00
meson.build meson: convert hw/isa 2020-08-21 06:30:29 -04:00
pc87312.c pc87312: Rename TYPE_PC87312_SUPERIO to TYPE_PC87312 2020-09-09 13:20:22 -04:00
piix3.c hw: Use the PCI_SLOT() macro from 'hw/pci/pci.h' 2021-01-04 23:24:44 +01:00
piix4.c Use OBJECT_DECLARE_SIMPLE_TYPE when possible 2020-09-18 14:12:32 -04:00
smc37c669-superio.c hw/isa/superio: Correct the license text 2020-04-01 19:00:16 +02:00
trace-events vt82c686: Make vt82c686-pm an I/O tracing region 2021-02-21 19:42:34 +01:00
trace.h trace: switch position of headers to what Meson requires 2020-08-21 06:18:24 -04:00
vt82c686.c acpi/core: always set SCI_EN when SMM isn't supported 2021-02-23 10:58:42 -05:00