mm: fix exec activate_mm vs TLB shootdown and lazy tlb switching race
[linux/fpc-iii.git] / arch / x86 / xen / enlighten_pvh.c
blobd6d7b29b3be0e31090e000bfae7c37baf76fcce8
1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/acpi.h>
4 #include <xen/hvc-console.h>
6 #include <asm/io_apic.h>
7 #include <asm/hypervisor.h>
8 #include <asm/e820/api.h>
10 #include <asm/xen/interface.h>
11 #include <asm/xen/hypercall.h>
13 #include <xen/interface/memory.h>
14 #include <xen/interface/hvm/start_info.h>
17 * PVH variables.
19 * xen_pvh and pvh_bootparams need to live in data segment since they
20 * are used after startup_{32|64}, which clear .bss, are invoked.
22 bool xen_pvh __attribute__((section(".data"))) = 0;
23 struct boot_params pvh_bootparams __attribute__((section(".data")));
25 struct hvm_start_info pvh_start_info;
26 unsigned int pvh_start_info_sz = sizeof(pvh_start_info);
28 static void xen_pvh_arch_setup(void)
30 /* Make sure we don't fall back to (default) ACPI_IRQ_MODEL_PIC. */
31 if (nr_ioapics == 0)
32 acpi_irq_model = ACPI_IRQ_MODEL_PLATFORM;
35 static void __init init_pvh_bootparams(void)
37 struct xen_memory_map memmap;
38 int rc;
40 memset(&pvh_bootparams, 0, sizeof(pvh_bootparams));
42 memmap.nr_entries = ARRAY_SIZE(pvh_bootparams.e820_table);
43 set_xen_guest_handle(memmap.buffer, pvh_bootparams.e820_table);
44 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
45 if (rc) {
46 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
47 BUG();
49 pvh_bootparams.e820_entries = memmap.nr_entries;
51 if (pvh_bootparams.e820_entries < E820_MAX_ENTRIES_ZEROPAGE - 1) {
52 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].addr =
53 ISA_START_ADDRESS;
54 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].size =
55 ISA_END_ADDRESS - ISA_START_ADDRESS;
56 pvh_bootparams.e820_table[pvh_bootparams.e820_entries].type =
57 E820_TYPE_RESERVED;
58 pvh_bootparams.e820_entries++;
59 } else
60 xen_raw_printk("Warning: Can fit ISA range into e820\n");
62 pvh_bootparams.hdr.cmd_line_ptr =
63 pvh_start_info.cmdline_paddr;
65 /* The first module is always ramdisk. */
66 if (pvh_start_info.nr_modules) {
67 struct hvm_modlist_entry *modaddr =
68 __va(pvh_start_info.modlist_paddr);
69 pvh_bootparams.hdr.ramdisk_image = modaddr->paddr;
70 pvh_bootparams.hdr.ramdisk_size = modaddr->size;
74 * See Documentation/x86/boot.txt.
76 * Version 2.12 supports Xen entry point but we will use default x86/PC
77 * environment (i.e. hardware_subarch 0).
79 pvh_bootparams.hdr.version = (2 << 8) | 12;
80 pvh_bootparams.hdr.type_of_loader = (9 << 4) | 0; /* Xen loader */
84 * This routine (and those that it might call) should not use
85 * anything that lives in .bss since that segment will be cleared later.
87 void __init xen_prepare_pvh(void)
89 u32 msr;
90 u64 pfn;
92 if (pvh_start_info.magic != XEN_HVM_START_MAGIC_VALUE) {
93 xen_raw_printk("Error: Unexpected magic value (0x%08x)\n",
94 pvh_start_info.magic);
95 BUG();
98 xen_pvh = 1;
100 msr = cpuid_ebx(xen_cpuid_base() + 2);
101 pfn = __pa(hypercall_page);
102 wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
104 init_pvh_bootparams();
106 x86_init.oem.arch_setup = xen_pvh_arch_setup;