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hvm.c
(13.09 KB)
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pv.c
(18.06 KB)
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pvcpu_enum.c
(6.84 KB)
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xen_apic.c
(11.96 KB)
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xen_intr.c
(43.65 KB)
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xen_msi.c
(3.15 KB)
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xen_nexus.c
(4.31 KB)
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xen_pci_bus.c
(2.95 KB)
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xenpv.c
(5.29 KB)
Editing: pv.c
/*- * SPDX-License-Identifier: BSD-2-Clause-NetBSD * * Copyright (c) 2004 Christian Limpach. * Copyright (c) 2004-2006,2008 Kip Macy * Copyright (c) 2008 The NetBSD Foundation, Inc. * Copyright (c) 2013 Roger Pau Monné <roger.pau@citrix.com> * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF * SUCH DAMAGE. */ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); #include "opt_ddb.h" #include "opt_kstack_pages.h" #include <sys/param.h> #include <sys/bus.h> #include <sys/kernel.h> #include <sys/reboot.h> #include <sys/systm.h> #include <sys/malloc.h> #include <sys/linker.h> #include <sys/lock.h> #include <sys/rwlock.h> #include <sys/boot.h> #include <sys/ctype.h> #include <sys/mutex.h> #include <sys/smp.h> #include <vm/vm.h> #include <vm/vm_extern.h> #include <vm/vm_kern.h> #include <vm/vm_page.h> #include <vm/vm_map.h> #include <vm/vm_object.h> #include <vm/vm_pager.h> #include <vm/vm_param.h> #include <machine/_inttypes.h> #include <machine/intr_machdep.h> #include <x86/apicvar.h> #include <x86/init.h> #include <machine/pc/bios.h> #include <machine/smp.h> #include <machine/intr_machdep.h> #include <machine/metadata.h> #include <xen/xen-os.h> #include <xen/hvm.h> #include <xen/hypervisor.h> #include <xen/xenstore/xenstorevar.h> #include <xen/xen_pv.h> #include <xen/xen_msi.h> #include <xen/interface/arch-x86/hvm/start_info.h> #include <xen/interface/vcpu.h> #include <dev/xen/timer/timer.h> #ifdef DDB #include <ddb/ddb.h> #endif /* Native initial function */ extern u_int64_t hammer_time(u_int64_t, u_int64_t); /* Xen initial function */ uint64_t hammer_time_xen_legacy(start_info_t *, uint64_t); uint64_t hammer_time_xen(vm_paddr_t); #define MAX_E820_ENTRIES 128 /*--------------------------- Forward Declarations ---------------------------*/ static caddr_t xen_legacy_pvh_parse_preload_data(uint64_t); static caddr_t xen_pvh_parse_preload_data(uint64_t); static void xen_pvh_parse_memmap(caddr_t, vm_paddr_t *, int *); #ifdef SMP static int xen_pv_start_all_aps(void); #endif /*---------------------------- Extern Declarations ---------------------------*/ #ifdef SMP /* Variables used by amd64 mp_machdep to start APs */ extern char *doublefault_stack; extern char *mce_stack; extern char *nmi_stack; extern char *dbg_stack; #endif /* * Placed by the linker at the end of the bss section, which is the last * section loaded by Xen before loading the symtab and strtab. */ extern uint32_t end; /*-------------------------------- Global Data -------------------------------*/ /* Xen init_ops implementation. */ struct init_ops xen_legacy_init_ops = { .parse_preload_data = xen_legacy_pvh_parse_preload_data, .early_clock_source_init = xen_clock_init, .early_delay = xen_delay, .parse_memmap = xen_pvh_parse_memmap, #ifdef SMP .start_all_aps = xen_pv_start_all_aps, #endif .msi_init = xen_msi_init, }; struct init_ops xen_pvh_init_ops = { .parse_preload_data = xen_pvh_parse_preload_data, .early_clock_source_init = xen_clock_init, .early_delay = xen_delay, .parse_memmap = xen_pvh_parse_memmap, #ifdef SMP .mp_bootaddress = mp_bootaddress, .start_all_aps = native_start_all_aps, #endif .msi_init = msi_init, }; static struct bios_smap xen_smap[MAX_E820_ENTRIES]; static start_info_t *legacy_start_info; static struct hvm_start_info *start_info; /*----------------------- Legacy PVH start_info accessors --------------------*/ static vm_paddr_t legacy_get_xenstore_mfn(void) { return (legacy_start_info->store_mfn); } static evtchn_port_t legacy_get_xenstore_evtchn(void) { return (legacy_start_info->store_evtchn); } static vm_paddr_t legacy_get_console_mfn(void) { return (legacy_start_info->console.domU.mfn); } static evtchn_port_t legacy_get_console_evtchn(void) { return (legacy_start_info->console.domU.evtchn); } static uint32_t legacy_get_start_flags(void) { return (legacy_start_info->flags); } struct hypervisor_info legacy_info = { .get_xenstore_mfn = legacy_get_xenstore_mfn, .get_xenstore_evtchn = legacy_get_xenstore_evtchn, .get_console_mfn = legacy_get_console_mfn, .get_console_evtchn = legacy_get_console_evtchn, .get_start_flags = legacy_get_start_flags, }; /*-------------------------------- Xen PV init -------------------------------*/ /* * First function called by the Xen legacy PVH boot sequence. * * Set some Xen global variables and prepare the environment so it is * as similar as possible to what native FreeBSD init function expects. */ uint64_t hammer_time_xen_legacy(start_info_t *si, uint64_t xenstack) { uint64_t physfree; uint64_t *PT4 = (u_int64_t *)xenstack; uint64_t *PT3 = (u_int64_t *)(xenstack + PAGE_SIZE); uint64_t *PT2 = (u_int64_t *)(xenstack + 2 * PAGE_SIZE); int i; char *kenv; xen_domain_type = XEN_PV_DOMAIN; vm_guest = VM_GUEST_XEN; if ((si == NULL) || (xenstack == 0)) { xc_printf("ERROR: invalid start_info or xen stack, halting\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } xc_printf("FreeBSD PVH running on %s\n", si->magic); /* We use 3 pages of xen stack for the boot pagetables */ physfree = xenstack + 3 * PAGE_SIZE - KERNBASE; /* Setup Xen global variables */ legacy_start_info = si; HYPERVISOR_shared_info = (shared_info_t *)(si->shared_info + KERNBASE); /* * Use the stack Xen gives us to build the page tables * as native FreeBSD expects to find them (created * by the boot trampoline). */ for (i = 0; i < (PAGE_SIZE / sizeof(uint64_t)); i++) { /* * Each slot of the level 4 pages points * to the same level 3 page */ PT4[i] = ((uint64_t)&PT3[0]) - KERNBASE; PT4[i] |= PG_V | PG_RW | PG_U; /* * Each slot of the level 3 pages points * to the same level 2 page */ PT3[i] = ((uint64_t)&PT2[0]) - KERNBASE; PT3[i] |= PG_V | PG_RW | PG_U; /* * The level 2 page slots are mapped with * 2MB pages for 1GB. */ PT2[i] = i * (2 * 1024 * 1024); PT2[i] |= PG_V | PG_RW | PG_PS | PG_U; } load_cr3(((uint64_t)&PT4[0]) - KERNBASE); /* * Init an empty static kenv using a free page. The contents will be * filled from the parse_preload_data hook. */ kenv = (void *)(physfree + KERNBASE); physfree += PAGE_SIZE; bzero_early(kenv, PAGE_SIZE); init_static_kenv(kenv, PAGE_SIZE); /* Set the hooks for early functions that diverge from bare metal */ init_ops = xen_legacy_init_ops; apic_ops = xen_apic_ops; hypervisor_info = legacy_info; /* Now we can jump into the native init function */ return (hammer_time(0, physfree)); } uint64_t hammer_time_xen(vm_paddr_t start_info_paddr) { struct hvm_modlist_entry *mod; struct xen_add_to_physmap xatp; uint64_t physfree; char *kenv; int rc; xen_domain_type = XEN_HVM_DOMAIN; vm_guest = VM_GUEST_XEN; rc = xen_hvm_init_hypercall_stubs(XEN_HVM_INIT_EARLY); if (rc) { xc_printf("ERROR: failed to initialize hypercall page: %d\n", rc); HYPERVISOR_shutdown(SHUTDOWN_crash); } start_info = (struct hvm_start_info *)(start_info_paddr + KERNBASE); if (start_info->magic != XEN_HVM_START_MAGIC_VALUE) { xc_printf("Unknown magic value in start_info struct: %#x\n", start_info->magic); HYPERVISOR_shutdown(SHUTDOWN_crash); } /* * The hvm_start_into structure is always appended after loading * the kernel and modules. */ physfree = roundup2(start_info_paddr + PAGE_SIZE, PAGE_SIZE); xatp.domid = DOMID_SELF; xatp.idx = 0; xatp.space = XENMAPSPACE_shared_info; xatp.gpfn = atop(physfree); if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp)) { xc_printf("ERROR: failed to setup shared_info page\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } HYPERVISOR_shared_info = (shared_info_t *)(physfree + KERNBASE); physfree += PAGE_SIZE; /* * Init a static kenv using a free page. The contents will be filled * from the parse_preload_data hook. */ kenv = (void *)(physfree + KERNBASE); physfree += PAGE_SIZE; bzero_early(kenv, PAGE_SIZE); init_static_kenv(kenv, PAGE_SIZE); if (start_info->modlist_paddr != 0) { if (start_info->modlist_paddr >= physfree) { xc_printf( "ERROR: unexpected module list memory address\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } if (start_info->nr_modules == 0) { xc_printf( "ERROR: modlist_paddr != 0 but nr_modules == 0\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } mod = (struct hvm_modlist_entry *) (vm_paddr_t)start_info->modlist_paddr + KERNBASE; if (mod[0].paddr >= physfree) { xc_printf("ERROR: unexpected module memory address\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } } /* Set the hooks for early functions that diverge from bare metal */ init_ops = xen_pvh_init_ops; hvm_start_flags = start_info->flags; /* Now we can jump into the native init function */ return (hammer_time(0, physfree)); } /*-------------------------------- PV specific -------------------------------*/ #ifdef SMP static bool start_xen_ap(int cpu) { struct vcpu_guest_context *ctxt; int ms, cpus = mp_naps; const size_t stacksize = kstack_pages * PAGE_SIZE; /* allocate and set up an idle stack data page */ bootstacks[cpu] = (void *)kmem_malloc(stacksize, M_WAITOK | M_ZERO); doublefault_stack = (char *)kmem_malloc(PAGE_SIZE, M_WAITOK | M_ZERO); mce_stack = (char *)kmem_malloc(PAGE_SIZE, M_WAITOK | M_ZERO); nmi_stack = (char *)kmem_malloc(PAGE_SIZE, M_WAITOK | M_ZERO); dbg_stack = (void *)kmem_malloc(PAGE_SIZE, M_WAITOK | M_ZERO); dpcpu = (void *)kmem_malloc(DPCPU_SIZE, M_WAITOK | M_ZERO); bootSTK = (char *)bootstacks[cpu] + kstack_pages * PAGE_SIZE - 8; bootAP = cpu; ctxt = malloc(sizeof(*ctxt), M_TEMP, M_WAITOK | M_ZERO); ctxt->flags = VGCF_IN_KERNEL; ctxt->user_regs.rip = (unsigned long) init_secondary; ctxt->user_regs.rsp = (unsigned long) bootSTK; /* Set the AP to use the same page tables */ ctxt->ctrlreg[3] = KPML4phys; if (HYPERVISOR_vcpu_op(VCPUOP_initialise, cpu, ctxt)) panic("unable to initialize AP#%d", cpu); free(ctxt, M_TEMP); /* Launch the vCPU */ if (HYPERVISOR_vcpu_op(VCPUOP_up, cpu, NULL)) panic("unable to start AP#%d", cpu); /* Wait up to 5 seconds for it to start. */ for (ms = 0; ms < 5000; ms++) { if (mp_naps > cpus) return (true); DELAY(1000); } return (false); } static int xen_pv_start_all_aps(void) { int cpu; mtx_init(&ap_boot_mtx, "ap boot", NULL, MTX_SPIN); for (cpu = 1; cpu < mp_ncpus; cpu++) { /* attempt to start the Application Processor */ if (!start_xen_ap(cpu)) panic("AP #%d failed to start!", cpu); CPU_SET(cpu, &all_cpus); /* record AP in CPU map */ } return (mp_naps); } #endif /* SMP */ /* * When booted as a PVH guest FreeBSD needs to avoid using the RSDP address * hint provided by the loader because it points to the native set of ACPI * tables instead of the ones crafted by Xen. The acpi.rsdp env variable is * removed from kenv if present, and a new acpi.rsdp is added to kenv that * points to the address of the Xen crafted RSDP. */ static bool reject_option(const char *option) { static const char *reject[] = { "acpi.rsdp", }; unsigned int i; for (i = 0; i < nitems(reject); i++) if (strncmp(option, reject[i], strlen(reject[i])) == 0) return (true); return (false); } static void xen_pvh_set_env(char *env, bool (*filter)(const char *)) { char *option; if (env == NULL) return; option = env; while (*option != 0) { char *value; if (filter != NULL && filter(option)) { option += strlen(option) + 1; continue; } value = option; option = strsep(&value, "="); if (kern_setenv(option, value) != 0) xc_printf("unable to add kenv %s=%s\n", option, value); option = value + strlen(value) + 1; } } #ifdef DDB /* * The way Xen loads the symtab is different from the native boot loader, * because it's tailored for NetBSD. So we have to adapt and use the same * method as NetBSD. Portions of the code below have been picked from NetBSD: * sys/kern/kern_ksyms.c CVS Revision 1.71. */ static void xen_pvh_parse_symtab(void) { Elf_Ehdr *ehdr; Elf_Shdr *shdr; uint32_t size; int i, j; size = end; ehdr = (Elf_Ehdr *)(&end + 1); if (memcmp(ehdr->e_ident, ELFMAG, SELFMAG) || ehdr->e_ident[EI_CLASS] != ELF_TARG_CLASS || ehdr->e_version > 1) { xc_printf("Unable to load ELF symtab: invalid symbol table\n"); return; } shdr = (Elf_Shdr *)((uint8_t *)ehdr + ehdr->e_shoff); /* Find the symbol table and the corresponding string table. */ for (i = 1; i < ehdr->e_shnum; i++) { if (shdr[i].sh_type != SHT_SYMTAB) continue; if (shdr[i].sh_offset == 0) continue; ksymtab = (uintptr_t)((uint8_t *)ehdr + shdr[i].sh_offset); ksymtab_size = shdr[i].sh_size; j = shdr[i].sh_link; if (shdr[j].sh_offset == 0) continue; /* Can this happen? */ kstrtab = (uintptr_t)((uint8_t *)ehdr + shdr[j].sh_offset); break; } if (ksymtab == 0 || kstrtab == 0) xc_printf( "Unable to load ELF symtab: could not find symtab or strtab\n"); } #endif static caddr_t xen_legacy_pvh_parse_preload_data(uint64_t modulep) { caddr_t kmdp; vm_ooffset_t off; vm_paddr_t metadata; char *envp; if (legacy_start_info->mod_start != 0) { preload_metadata = (caddr_t)legacy_start_info->mod_start; kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); KASSERT(kmdp != NULL, ("unable to find kernel")); /* * Xen has relocated the metadata and the modules, * so we need to recalculate it's position. This is * done by saving the original modulep address and * then calculating the offset with mod_start, * which contains the relocated modulep address. */ metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t); off = legacy_start_info->mod_start - metadata; preload_bootstrap_relocate(off); boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); if (envp != NULL) envp += off; xen_pvh_set_env(envp, NULL); } else { /* Parse the extra boot information given by Xen */ boot_parse_cmdline_delim(legacy_start_info->cmd_line, ","); kmdp = NULL; } boothowto |= boot_env_to_howto(); #ifdef DDB xen_pvh_parse_symtab(); #endif return (kmdp); } static caddr_t xen_pvh_parse_preload_data(uint64_t modulep) { caddr_t kmdp; vm_ooffset_t off; vm_paddr_t metadata; char *envp; char acpi_rsdp[19]; if (start_info->modlist_paddr != 0) { struct hvm_modlist_entry *mod; const char *cmdline; mod = (struct hvm_modlist_entry *) (start_info->modlist_paddr + KERNBASE); cmdline = mod[0].cmdline_paddr ? (const char *)(mod[0].cmdline_paddr + KERNBASE) : NULL; if (strcmp(cmdline, "header") == 0) { struct xen_header *header; header = (struct xen_header *)(mod[0].paddr + KERNBASE); if ((header->flags & XENHEADER_HAS_MODULEP_OFFSET) != XENHEADER_HAS_MODULEP_OFFSET) { xc_printf("Unable to load module metadata\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } preload_metadata = (caddr_t)(mod[0].paddr + header->modulep_offset + KERNBASE); kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); if (kmdp == NULL) { xc_printf("Unable to find kernel\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } /* * Xen has relocated the metadata and the modules, so * we need to recalculate it's position. This is done * by saving the original modulep address and then * calculating the offset from the real modulep * position. */ metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t); off = mod[0].paddr + header->modulep_offset - metadata + KERNBASE; } else { preload_metadata = (caddr_t)(mod[0].paddr + KERNBASE); kmdp = preload_search_by_type("elf kernel"); if (kmdp == NULL) kmdp = preload_search_by_type("elf64 kernel"); if (kmdp == NULL) { xc_printf("Unable to find kernel\n"); HYPERVISOR_shutdown(SHUTDOWN_crash); } metadata = MD_FETCH(kmdp, MODINFOMD_MODULEP, vm_paddr_t); off = mod[0].paddr + KERNBASE - metadata; } preload_bootstrap_relocate(off); boothowto = MD_FETCH(kmdp, MODINFOMD_HOWTO, int); envp = MD_FETCH(kmdp, MODINFOMD_ENVP, char *); if (envp != NULL) envp += off; xen_pvh_set_env(envp, reject_option); } else { /* Parse the extra boot information given by Xen */ if (start_info->cmdline_paddr != 0) boot_parse_cmdline_delim( (char *)(start_info->cmdline_paddr + KERNBASE), ","); kmdp = NULL; } boothowto |= boot_env_to_howto(); snprintf(acpi_rsdp, sizeof(acpi_rsdp), "%#" PRIx64, start_info->rsdp_paddr); kern_setenv("acpi.rsdp", acpi_rsdp); #ifdef DDB xen_pvh_parse_symtab(); #endif return (kmdp); } static void xen_pvh_parse_memmap(caddr_t kmdp, vm_paddr_t *physmap, int *physmap_idx) { struct xen_memory_map memmap; u_int32_t size; int rc; /* Fetch the E820 map from Xen */ memmap.nr_entries = MAX_E820_ENTRIES; set_xen_guest_handle(memmap.buffer, xen_smap); rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap); if (rc) { xc_printf("ERROR: unable to fetch Xen E820 memory map: %d\n", rc); HYPERVISOR_shutdown(SHUTDOWN_crash); } size = memmap.nr_entries * sizeof(xen_smap[0]); bios_add_smap_entries(xen_smap, size, physmap, physmap_idx); }
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