From 6be8cf56bc8bda2ed9a070bdb04446191f31acc9 Mon Sep 17 00:00:00 2001 From: Isaku Yamahata Date: Wed, 17 Feb 2021 21:51:12 -0800 Subject: [PATCH] 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/acpi/core.c | 11 ++++++++++- hw/acpi/ich9.c | 2 +- hw/acpi/piix4.c | 3 ++- hw/core/machine.c | 5 ++++- hw/isa/vt82c686.c | 2 +- include/hw/acpi/acpi.h | 4 +++- 6 files changed, 21 insertions(+), 6 deletions(-) diff --git a/hw/acpi/core.c b/hw/acpi/core.c index 7170bff6572..1e004d0078d 100644 --- a/hw/acpi/core.c +++ b/hw/acpi/core.c @@ -579,6 +579,10 @@ void acpi_pm1_cnt_update(ACPIREGS *ar, bool sci_enable, bool sci_disable) { /* ACPI specs 3.0, 4.7.2.5 */ + if (ar->pm1.cnt.acpi_only) { + return; + } + if (sci_enable) { ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE; } else if (sci_disable) { @@ -608,11 +612,13 @@ static const MemoryRegionOps acpi_pm_cnt_ops = { }; void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent, - bool disable_s3, bool disable_s4, uint8_t s4_val) + bool disable_s3, bool disable_s4, uint8_t s4_val, + bool acpi_only) { FWCfgState *fw_cfg; ar->pm1.cnt.s4_val = s4_val; + ar->pm1.cnt.acpi_only = acpi_only; ar->wakeup.notify = acpi_notify_wakeup; qemu_register_wakeup_notifier(&ar->wakeup); @@ -638,6 +644,9 @@ void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent, void acpi_pm1_cnt_reset(ACPIREGS *ar) { ar->pm1.cnt.cnt = 0; + if (ar->pm1.cnt.acpi_only) { + ar->pm1.cnt.cnt |= ACPI_BITMASK_SCI_ENABLE; + } } /* ACPI GPE */ diff --git a/hw/acpi/ich9.c b/hw/acpi/ich9.c index 5ff4e01c369..853447cf9d2 100644 --- a/hw/acpi/ich9.c +++ b/hw/acpi/ich9.c @@ -282,7 +282,7 @@ void ich9_pm_init(PCIDevice *lpc_pci, ICH9LPCPMRegs *pm, acpi_pm_tmr_init(&pm->acpi_regs, ich9_pm_update_sci_fn, &pm->io); acpi_pm1_evt_init(&pm->acpi_regs, ich9_pm_update_sci_fn, &pm->io); acpi_pm1_cnt_init(&pm->acpi_regs, &pm->io, pm->disable_s3, pm->disable_s4, - pm->s4_val); + pm->s4_val, !pm->smm_compat && !smm_enabled); acpi_gpe_init(&pm->acpi_regs, ICH9_PMIO_GPE0_LEN); memory_region_init_io(&pm->io_gpe, OBJECT(lpc_pci), &ich9_gpe_ops, pm, diff --git a/hw/acpi/piix4.c b/hw/acpi/piix4.c index 30dd9b23095..1efc0ded9f6 100644 --- a/hw/acpi/piix4.c +++ b/hw/acpi/piix4.c @@ -497,7 +497,8 @@ static void piix4_pm_realize(PCIDevice *dev, Error **errp) acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io); acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io); - acpi_pm1_cnt_init(&s->ar, &s->io, s->disable_s3, s->disable_s4, s->s4_val); + acpi_pm1_cnt_init(&s->ar, &s->io, s->disable_s3, s->disable_s4, s->s4_val, + !s->smm_compat && !s->smm_enabled); acpi_gpe_init(&s->ar, GPE_LEN); s->powerdown_notifier.notify = piix4_pm_powerdown_req; diff --git a/hw/core/machine.c b/hw/core/machine.c index 970046f4388..4386f57b5cd 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[] = { diff --git a/hw/isa/vt82c686.c b/hw/isa/vt82c686.c index 5db9b1706c8..05d084f6982 100644 --- a/hw/isa/vt82c686.c +++ b/hw/isa/vt82c686.c @@ -190,7 +190,7 @@ static void via_pm_realize(PCIDevice *dev, Error **errp) acpi_pm_tmr_init(&s->ar, pm_tmr_timer, &s->io); acpi_pm1_evt_init(&s->ar, pm_tmr_timer, &s->io); - acpi_pm1_cnt_init(&s->ar, &s->io, false, false, 2); + acpi_pm1_cnt_init(&s->ar, &s->io, false, false, 2, false); } typedef struct via_pm_init_info { diff --git a/include/hw/acpi/acpi.h b/include/hw/acpi/acpi.h index 22b0b65bb2b..9e8a76f2e2a 100644 --- a/include/hw/acpi/acpi.h +++ b/include/hw/acpi/acpi.h @@ -128,6 +128,7 @@ struct ACPIPM1CNT { MemoryRegion io; uint16_t cnt; uint8_t s4_val; + bool acpi_only; }; struct ACPIGPE { @@ -163,7 +164,8 @@ void acpi_pm1_evt_init(ACPIREGS *ar, acpi_update_sci_fn update_sci, /* PM1a_CNT: piix and ich9 don't implement PM1b CNT. */ void acpi_pm1_cnt_init(ACPIREGS *ar, MemoryRegion *parent, - bool disable_s3, bool disable_s4, uint8_t s4_val); + bool disable_s3, bool disable_s4, uint8_t s4_val, + bool acpi_only); void acpi_pm1_cnt_update(ACPIREGS *ar, bool sci_enable, bool sci_disable); void acpi_pm1_cnt_reset(ACPIREGS *ar); -- 2.39.2