In case phys bits are functional and can be used by the guest (aka host-phys-bits=on) add a fw_cfg file carrying the value. This can be used by the guest firmware for address space configuration. The value in the etc/phys-bits fw_cfg file should be identical to the phys bits value published via cpuid leaf 0x80000008. This is only enabled for 7.2+ machine types for live migration compatibility reasons. Signed-off-by: Gerd Hoffmann <kraxel@xxxxxxxxxx> Reviewed-by: Michael S. Tsirkin <mst@xxxxxxxxxx> --- hw/i386/fw_cfg.h | 1 + include/hw/i386/pc.h | 1 + hw/i386/fw_cfg.c | 12 ++++++++++++ hw/i386/pc.c | 5 +++++ hw/i386/pc_piix.c | 2 ++ hw/i386/pc_q35.c | 2 ++ 6 files changed, 23 insertions(+) diff --git a/hw/i386/fw_cfg.h b/hw/i386/fw_cfg.h index 275f15c1c5e8..6ff198a6cb85 100644 --- a/hw/i386/fw_cfg.h +++ b/hw/i386/fw_cfg.h @@ -26,5 +26,6 @@ FWCfgState *fw_cfg_arch_create(MachineState *ms, void fw_cfg_build_smbios(MachineState *ms, FWCfgState *fw_cfg); void fw_cfg_build_feature_control(MachineState *ms, FWCfgState *fw_cfg); void fw_cfg_add_acpi_dsdt(Aml *scope, FWCfgState *fw_cfg); +void fw_cfg_phys_bits(FWCfgState *fw_cfg); #endif diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h index c95333514ed3..bedef1ee13c1 100644 --- a/include/hw/i386/pc.h +++ b/include/hw/i386/pc.h @@ -119,6 +119,7 @@ struct PCMachineClass { bool enforce_aligned_dimm; bool broken_reserved_end; bool enforce_amd_1tb_hole; + bool phys_bits_in_fw_cfg; /* generate legacy CPU hotplug AML */ bool legacy_cpu_hotplug; diff --git a/hw/i386/fw_cfg.c b/hw/i386/fw_cfg.c index a283785a8de4..6a1f18925725 100644 --- a/hw/i386/fw_cfg.c +++ b/hw/i386/fw_cfg.c @@ -219,3 +219,15 @@ void fw_cfg_add_acpi_dsdt(Aml *scope, FWCfgState *fw_cfg) aml_append(dev, aml_name_decl("_CRS", crs)); aml_append(scope, dev); } + +void fw_cfg_phys_bits(FWCfgState *fw_cfg) +{ + X86CPU *cpu = X86_CPU(first_cpu); + uint64_t phys_bits = cpu->phys_bits; + + if (cpu->host_phys_bits) { + fw_cfg_add_file(fw_cfg, "etc/phys-bits", + g_memdup2(&phys_bits, sizeof(phys_bits)), + sizeof(phys_bits)); + } +} diff --git a/hw/i386/pc.c b/hw/i386/pc.c index 566accf7e60a..17ecc7fe4331 100644 --- a/hw/i386/pc.c +++ b/hw/i386/pc.c @@ -744,6 +744,7 @@ void pc_machine_done(Notifier *notifier, void *data) { PCMachineState *pcms = container_of(notifier, PCMachineState, machine_done); + PCMachineClass *pcmc = PC_MACHINE_GET_CLASS(pcms); X86MachineState *x86ms = X86_MACHINE(pcms); cxl_hook_up_pxb_registers(pcms->bus, &pcms->cxl_devices_state, @@ -764,6 +765,9 @@ void pc_machine_done(Notifier *notifier, void *data) fw_cfg_build_feature_control(MACHINE(pcms), x86ms->fw_cfg); /* update FW_CFG_NB_CPUS to account for -device added CPUs */ fw_cfg_modify_i16(x86ms->fw_cfg, FW_CFG_NB_CPUS, x86ms->boot_cpus); + if (pcmc->phys_bits_in_fw_cfg) { + fw_cfg_phys_bits(x86ms->fw_cfg); + } } } @@ -1907,6 +1911,7 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) pcmc->kvmclock_enabled = true; pcmc->enforce_aligned_dimm = true; pcmc->enforce_amd_1tb_hole = true; + pcmc->phys_bits_in_fw_cfg = true; /* BIOS ACPI tables: 128K. Other BIOS datastructures: less than 4K reported * to be used at the moment, 32K should be enough for a while. */ pcmc->acpi_data_size = 0x20000 + 0x8000; diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c index 8043a250adf3..c6a4dbd5c0b0 100644 --- a/hw/i386/pc_piix.c +++ b/hw/i386/pc_piix.c @@ -447,9 +447,11 @@ DEFINE_I440FX_MACHINE(v7_2, "pc-i440fx-7.2", NULL, static void pc_i440fx_7_1_machine_options(MachineClass *m) { + PCMachineClass *pcmc = PC_MACHINE_CLASS(m); pc_i440fx_7_2_machine_options(m); m->alias = NULL; m->is_default = false; + pcmc->phys_bits_in_fw_cfg = false; compat_props_add(m->compat_props, hw_compat_7_1, hw_compat_7_1_len); compat_props_add(m->compat_props, pc_compat_7_1, pc_compat_7_1_len); } diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c index 53eda50e818c..c2b56daa1550 100644 --- a/hw/i386/pc_q35.c +++ b/hw/i386/pc_q35.c @@ -384,8 +384,10 @@ DEFINE_Q35_MACHINE(v7_2, "pc-q35-7.2", NULL, static void pc_q35_7_1_machine_options(MachineClass *m) { + PCMachineClass *pcmc = PC_MACHINE_CLASS(m); pc_q35_7_2_machine_options(m); m->alias = NULL; + pcmc->phys_bits_in_fw_cfg = false; compat_props_add(m->compat_props, hw_compat_7_1, hw_compat_7_1_len); compat_props_add(m->compat_props, pc_compat_7_1, pc_compat_7_1_len); } -- 2.37.3