f1e5250094
When running as a Xen PV guest there is no need for setting up the
realmode trampoline, as realmode isn't supported in this environment.
Trying to setup the trampoline has been proven to be problematic in
some cases, especially when trying to debug early boot problems with
Xen requiring to keep the EFI boot-services memory mapped (some
firmware variants seem to claim basically all memory below 1Mb for boot
services).
Introduce new x86_platform_ops operations for that purpose, which can
be set to a NOP by the Xen PV specific kernel boot code.
[ bp: s/call_init_real_mode/do_init_real_mode/ ]
Fixes: 084ee1c641a0 ("x86, realmode: Relocator for realmode code")
Suggested-by: H. Peter Anvin <hpa@zytor.com>
Signed-off-by: Juergen Gross <jgross@suse.com>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20221123114523.3467-1-jgross@suse.com
167 lines
4.7 KiB
C
167 lines
4.7 KiB
C
/*
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* Copyright (C) 2009 Thomas Gleixner <tglx@linutronix.de>
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*
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* For licencing details see kernel-base/COPYING
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*/
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#include <linux/init.h>
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#include <linux/ioport.h>
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#include <linux/export.h>
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#include <linux/pci.h>
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#include <asm/acpi.h>
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#include <asm/bios_ebda.h>
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#include <asm/paravirt.h>
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#include <asm/pci_x86.h>
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#include <asm/mpspec.h>
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#include <asm/setup.h>
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#include <asm/apic.h>
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#include <asm/e820/api.h>
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#include <asm/time.h>
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#include <asm/irq.h>
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#include <asm/io_apic.h>
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#include <asm/hpet.h>
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#include <asm/memtype.h>
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#include <asm/tsc.h>
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#include <asm/iommu.h>
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#include <asm/mach_traps.h>
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#include <asm/irqdomain.h>
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#include <asm/realmode.h>
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void x86_init_noop(void) { }
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void __init x86_init_uint_noop(unsigned int unused) { }
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static int __init iommu_init_noop(void) { return 0; }
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static void iommu_shutdown_noop(void) { }
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bool __init bool_x86_init_noop(void) { return false; }
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void x86_op_int_noop(int cpu) { }
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static __init int set_rtc_noop(const struct timespec64 *now) { return -EINVAL; }
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static __init void get_rtc_noop(struct timespec64 *now) { }
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static __initconst const struct of_device_id of_cmos_match[] = {
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{ .compatible = "motorola,mc146818" },
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{}
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};
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/*
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* Allow devicetree configured systems to disable the RTC by setting the
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* corresponding DT node's status property to disabled. Code is optimized
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* out for CONFIG_OF=n builds.
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*/
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static __init void x86_wallclock_init(void)
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{
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struct device_node *node = of_find_matching_node(NULL, of_cmos_match);
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if (node && !of_device_is_available(node)) {
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x86_platform.get_wallclock = get_rtc_noop;
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x86_platform.set_wallclock = set_rtc_noop;
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}
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}
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/*
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* The platform setup functions are preset with the default functions
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* for standard PC hardware.
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*/
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struct x86_init_ops x86_init __initdata = {
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.resources = {
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.probe_roms = probe_roms,
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.reserve_resources = reserve_standard_io_resources,
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.memory_setup = e820__memory_setup_default,
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},
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.mpparse = {
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.setup_ioapic_ids = x86_init_noop,
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.find_smp_config = default_find_smp_config,
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.get_smp_config = default_get_smp_config,
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},
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.irqs = {
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.pre_vector_init = init_ISA_irqs,
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.intr_init = native_init_IRQ,
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.intr_mode_select = apic_intr_mode_select,
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.intr_mode_init = apic_intr_mode_init,
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.create_pci_msi_domain = native_create_pci_msi_domain,
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},
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.oem = {
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.arch_setup = x86_init_noop,
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.banner = default_banner,
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},
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.paging = {
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.pagetable_init = native_pagetable_init,
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},
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.timers = {
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.setup_percpu_clockev = setup_boot_APIC_clock,
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.timer_init = hpet_time_init,
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.wallclock_init = x86_wallclock_init,
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},
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.iommu = {
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.iommu_init = iommu_init_noop,
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},
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.pci = {
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.init = x86_default_pci_init,
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.init_irq = x86_default_pci_init_irq,
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.fixup_irqs = x86_default_pci_fixup_irqs,
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},
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.hyper = {
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.init_platform = x86_init_noop,
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.guest_late_init = x86_init_noop,
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.x2apic_available = bool_x86_init_noop,
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.msi_ext_dest_id = bool_x86_init_noop,
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.init_mem_mapping = x86_init_noop,
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.init_after_bootmem = x86_init_noop,
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},
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.acpi = {
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.set_root_pointer = x86_default_set_root_pointer,
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.get_root_pointer = x86_default_get_root_pointer,
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.reduced_hw_early_init = acpi_generic_reduced_hw_init,
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},
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};
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struct x86_cpuinit_ops x86_cpuinit = {
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.early_percpu_clock_init = x86_init_noop,
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.setup_percpu_clockev = setup_secondary_APIC_clock,
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};
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static void default_nmi_init(void) { };
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static void enc_status_change_prepare_noop(unsigned long vaddr, int npages, bool enc) { }
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static bool enc_status_change_finish_noop(unsigned long vaddr, int npages, bool enc) { return false; }
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static bool enc_tlb_flush_required_noop(bool enc) { return false; }
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static bool enc_cache_flush_required_noop(void) { return false; }
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struct x86_platform_ops x86_platform __ro_after_init = {
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.calibrate_cpu = native_calibrate_cpu_early,
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.calibrate_tsc = native_calibrate_tsc,
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.get_wallclock = mach_get_cmos_time,
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.set_wallclock = mach_set_cmos_time,
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.iommu_shutdown = iommu_shutdown_noop,
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.is_untracked_pat_range = is_ISA_range,
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.nmi_init = default_nmi_init,
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.get_nmi_reason = default_get_nmi_reason,
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.save_sched_clock_state = tsc_save_sched_clock_state,
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.restore_sched_clock_state = tsc_restore_sched_clock_state,
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.realmode_reserve = reserve_real_mode,
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.realmode_init = init_real_mode,
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.hyper.pin_vcpu = x86_op_int_noop,
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.guest = {
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.enc_status_change_prepare = enc_status_change_prepare_noop,
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.enc_status_change_finish = enc_status_change_finish_noop,
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.enc_tlb_flush_required = enc_tlb_flush_required_noop,
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.enc_cache_flush_required = enc_cache_flush_required_noop,
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},
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};
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EXPORT_SYMBOL_GPL(x86_platform);
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struct x86_apic_ops x86_apic_ops __ro_after_init = {
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.io_apic_read = native_io_apic_read,
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.restore = native_restore_boot_irq_mode,
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};
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