From 6be8cf56bc8bda2ed9a070bdb04446191f31acc9 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Wed, 17 Feb 2021 21:51:12 -0800 Subject: 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 Signed-off-by: Isaku Yamahata Message-Id: <500f62081626997e46f96377393d3662211763a8.1613615732.git.isaku.yamahata@intel.com> Reviewed-by: Michael S. Tsirkin Signed-off-by: Michael S. Tsirkin --- hw/core/machine.c | 5 ++++- 1 file changed, 4 insertions(+), 1 deletion(-) (limited to 'hw/core/machine.c') diff --git a/hw/core/machine.c b/hw/core/machine.c index 970046f438..4386f57b5c 100644 --- a/hw/core/machine.c +++ b/hw/core/machine.c @@ -36,7 +36,10 @@ #include "hw/virtio/virtio.h" #include "hw/virtio/virtio-pci.h" -GlobalProperty hw_compat_5_2[] = {}; +GlobalProperty hw_compat_5_2[] = { + { "ICH9-LPC", "smm-compat", "on"}, + { "PIIX4_PM", "smm-compat", "on"}, +}; const size_t hw_compat_5_2_len = G_N_ELEMENTS(hw_compat_5_2); GlobalProperty hw_compat_5_1[] = { -- cgit 1.4.1