#include <linux/init.h> #include <asm/x86_init.h> #include <asm/apic.h> #include <asm/xen/hypercall.h> #include <xen/xen.h> #include <xen/interface/physdev.h> #include "xen-ops.h" #include "smp.h" static unsigned int xen_io_apic_read(unsigned apic, unsigned reg) { struct physdev_apic apic_op; int ret; apic_op.apic_physbase = mpc_ioapic_addr(apic); apic_op.reg = reg; ret = HYPERVISOR_physdev_op(PHYSDEVOP_apic_read, &apic_op); if (!ret) return apic_op.value; /* fallback to return an emulated IO_APIC values */ if (reg == 0x1) return 0x00170020; else if (reg == 0x0) return apic << 24; return 0xfd; } static unsigned long xen_set_apic_id(unsigned int x) { WARN_ON(1); return x; } static unsigned int xen_get_apic_id(unsigned long x) { return ((x)>>24) & 0xFFu; } static u32 xen_apic_read(u32 reg) { struct xen_platform_op op = { .cmd = XENPF_get_cpuinfo, .interface_version = XENPF_INTERFACE_VERSION, .u.pcpu_info.xen_cpuid = 0, }; int ret = 0; /* Shouldn't need this as APIC is turned off for PV, and we only * get called on the bootup processor. But just in case. */ if (!xen_initial_domain() || smp_processor_id()) return 0; if (reg == APIC_LVR) return 0x10; #ifdef CONFIG_X86_32 if (reg == APIC_LDR) return SET_APIC_LOGICAL_ID(1UL << smp_processor_id()); #endif if (reg != APIC_ID) return 0; ret = HYPERVISOR_dom0_op(&op); if (ret) return 0; return op.u.pcpu_info.apic_id << 24; } static void xen_apic_write(u32 reg, u32 val) { /* Warn to see if there's any stray references */ WARN(1,"register: %x, value: %x\n", reg, val); } static u64 xen_apic_icr_read(void) { return 0; } static void xen_apic_icr_write(u32 low, u32 id) { /* Warn to see if there's any stray references */ WARN_ON(1); } static u32 xen_safe_apic_wait_icr_idle(void) { return 0; } static int xen_apic_probe_pv(void) { if (xen_pv_domain()) return 1; return 0; } static int xen_madt_oem_check(char *oem_id, char *oem_table_id) { return xen_pv_domain(); } static int xen_id_always_valid(int apicid) { return 1; } static int xen_id_always_registered(void) { return 1; } static int xen_phys_pkg_id(int initial_apic_id, int index_msb) { return initial_apic_id >> index_msb; } #ifdef CONFIG_X86_32 static int xen_x86_32_early_logical_apicid(int cpu) { /* Match with APIC_LDR read. Otherwise setup_local_APIC complains. */ return 1 << cpu; } #endif static void xen_noop(void) { } static void xen_silent_inquire(int apicid) { } static struct apic xen_pv_apic = { .name = "Xen PV", .probe = xen_apic_probe_pv, .acpi_madt_oem_check = xen_madt_oem_check, .apic_id_valid = xen_id_always_valid, .apic_id_registered = xen_id_always_registered, /* .irq_delivery_mode - used in native_compose_msi_msg only */ /* .irq_dest_mode - used in native_compose_msi_msg only */ .target_cpus = default_target_cpus, .disable_esr = 0, /* .dest_logical - default_send_IPI_ use it but we use our own. */ .check_apicid_used = default_check_apicid_used, /* Used on 32-bit */ .vector_allocation_domain = flat_vector_allocation_domain, .init_apic_ldr = xen_noop, /* setup_local_APIC calls it */ .ioapic_phys_id_map = default_ioapic_phys_id_map, /* Used on 32-bit */ .setup_apic_routing = NULL, .cpu_present_to_apicid = default_cpu_present_to_apicid, .apicid_to_cpu_present = physid_set_mask_of_physid, /* Used on 32-bit */ .check_phys_apicid_present = default_check_phys_apicid_present, /* smp_sanity_check needs it */ .phys_pkg_id = xen_phys_pkg_id, /* detect_ht */ .get_apic_id = xen_get_apic_id, .set_apic_id = xen_set_apic_id, /* Can be NULL on 32-bit. */ .apic_id_mask = 0xFF << 24, /* Used by verify_local_APIC. Match with what xen_get_apic_id does. */ .cpu_mask_to_apicid_and = flat_cpu_mask_to_apicid_and, #ifdef CONFIG_SMP .send_IPI_mask = xen_send_IPI_mask, .send_IPI_mask_allbutself = xen_send_IPI_mask_allbutself, .send_IPI_allbutself = xen_send_IPI_allbutself, .send_IPI_all = xen_send_IPI_all, .send_IPI_self = xen_send_IPI_self, #endif /* .wait_for_init_deassert- used by AP bootup - smp_callin which we don't use */ .inquire_remote_apic = xen_silent_inquire, .read = xen_apic_read, .write = xen_apic_write, .eoi_write = xen_apic_write, .icr_read = xen_apic_icr_read, .icr_write = xen_apic_icr_write, .wait_icr_idle = xen_noop, .safe_wait_icr_idle = xen_safe_apic_wait_icr_idle, #ifdef CONFIG_X86_32 /* generic_processor_info and setup_local_APIC. */ .x86_32_early_logical_apicid = xen_x86_32_early_logical_apicid, #endif }; static void __init xen_apic_check(void) { if (apic == &xen_pv_apic) return; pr_info("Switched APIC routing from %s to %s.\n", apic->name, xen_pv_apic.name); apic = &xen_pv_apic; } void __init xen_init_apic(void) { x86_io_apic_ops.read = xen_io_apic_read; /* On PV guests the APIC CPUID bit is disabled so none of the * routines end up executing. */ if (!xen_initial_domain()) apic = &xen_pv_apic; x86_platform.apic_post_init = xen_apic_check; } apic_driver(xen_pv_apic);