1 // SPDX-License-Identifier: GPL-2.0
2 #include <linux/acpi.h>
3 #include <linux/export.h>
4 #include <linux/mm.h>
5
6 #include <xen/hvc-console.h>
7 #include <xen/acpi.h>
8
9 #include <asm/bootparam.h>
10 #include <asm/io_apic.h>
11 #include <asm/hypervisor.h>
12 #include <asm/e820/api.h>
13 #include <asm/setup.h>
14
15 #include <xen/xen.h>
16 #include <asm/xen/interface.h>
17 #include <asm/xen/hypercall.h>
18
19 #include <xen/interface/memory.h>
20
21 #include "xen-ops.h"
22
23 /*
24 * PVH variables.
25 *
26 * The variable xen_pvh needs to live in a data segment since it is used
27 * after startup_{32|64} is invoked, which will clear the .bss segment.
28 */
29 bool __ro_after_init xen_pvh;
30 EXPORT_SYMBOL_GPL(xen_pvh);
31
32 #ifdef CONFIG_XEN_DOM0
xen_pvh_setup_gsi(int gsi,int trigger,int polarity)33 int xen_pvh_setup_gsi(int gsi, int trigger, int polarity)
34 {
35 int ret;
36 struct physdev_setup_gsi setup_gsi;
37
38 setup_gsi.gsi = gsi;
39 setup_gsi.triggering = (trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
40 setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
41
42 ret = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
43 if (ret == -EEXIST) {
44 xen_raw_printk("Already setup the GSI :%d\n", gsi);
45 ret = 0;
46 } else if (ret)
47 xen_raw_printk("Fail to setup GSI (%d)!\n", gsi);
48
49 return ret;
50 }
51 EXPORT_SYMBOL_GPL(xen_pvh_setup_gsi);
52 #endif
53
54 /*
55 * Reserve e820 UNUSABLE regions to inflate the memory balloon.
56 *
57 * On PVH dom0 the host memory map is used, RAM regions available to dom0 are
58 * located as the same place as in the native memory map, but since dom0 gets
59 * less memory than the total amount of host RAM the ranges that can't be
60 * populated are converted from RAM -> UNUSABLE. Use such regions (up to the
61 * ratio signaled in EXTRA_MEM_RATIO) in order to inflate the balloon driver at
62 * boot. Doing so prevents the guest (even if just temporary) from using holes
63 * in the memory map in order to map grants or foreign addresses, and
64 * hopefully limits the risk of a clash with a device MMIO region. Ideally the
65 * hypervisor should notify us which memory ranges are suitable for creating
66 * foreign mappings, but that's not yet implemented.
67 */
pvh_reserve_extra_memory(void)68 static void __init pvh_reserve_extra_memory(void)
69 {
70 struct boot_params *bootp = &boot_params;
71 unsigned int i, ram_pages = 0, extra_pages;
72
73 for (i = 0; i < bootp->e820_entries; i++) {
74 struct boot_e820_entry *e = &bootp->e820_table[i];
75
76 if (e->type != E820_TYPE_RAM)
77 continue;
78 ram_pages += PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr);
79 }
80
81 /* Max amount of extra memory. */
82 extra_pages = EXTRA_MEM_RATIO * ram_pages;
83
84 /*
85 * Convert UNUSABLE ranges to RAM and reserve them for foreign mapping
86 * purposes.
87 */
88 for (i = 0; i < bootp->e820_entries && extra_pages; i++) {
89 struct boot_e820_entry *e = &bootp->e820_table[i];
90 unsigned long pages;
91
92 if (e->type != E820_TYPE_UNUSABLE)
93 continue;
94
95 pages = min(extra_pages,
96 PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr));
97
98 if (pages != (PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr))) {
99 struct boot_e820_entry *next;
100
101 if (bootp->e820_entries ==
102 ARRAY_SIZE(bootp->e820_table))
103 /* No space left to split - skip region. */
104 continue;
105
106 /* Split entry. */
107 next = e + 1;
108 memmove(next, e,
109 (bootp->e820_entries - i) * sizeof(*e));
110 bootp->e820_entries++;
111 next->addr = PAGE_ALIGN(e->addr) + PFN_PHYS(pages);
112 e->size = next->addr - e->addr;
113 next->size -= e->size;
114 }
115 e->type = E820_TYPE_RAM;
116 extra_pages -= pages;
117
118 xen_add_extra_mem(PFN_UP(e->addr), pages);
119 }
120 }
121
pvh_arch_setup(void)122 static void __init pvh_arch_setup(void)
123 {
124 pvh_reserve_extra_memory();
125
126 if (xen_initial_domain())
127 xen_add_preferred_consoles();
128 }
129
xen_pvh_init(struct boot_params * boot_params)130 void __init xen_pvh_init(struct boot_params *boot_params)
131 {
132 xen_pvh = 1;
133 xen_domain_type = XEN_HVM_DOMAIN;
134 xen_start_flags = pvh_start_info.flags;
135
136 x86_init.oem.arch_setup = pvh_arch_setup;
137 x86_init.oem.banner = xen_banner;
138
139 xen_efi_init(boot_params);
140
141 if (xen_initial_domain()) {
142 struct xen_platform_op op = {
143 .cmd = XENPF_get_dom0_console,
144 };
145 int ret = HYPERVISOR_platform_op(&op);
146
147 if (ret > 0)
148 xen_init_vga(&op.u.dom0_console,
149 min(ret * sizeof(char),
150 sizeof(op.u.dom0_console)),
151 &boot_params->screen_info);
152 }
153 }
154
mem_map_via_hcall(struct boot_params * boot_params_p)155 void __init mem_map_via_hcall(struct boot_params *boot_params_p)
156 {
157 struct xen_memory_map memmap;
158 int rc;
159
160 memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
161 set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
162 rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
163 if (rc) {
164 xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
165 BUG();
166 }
167 boot_params_p->e820_entries = memmap.nr_entries;
168 }
169