14df7363eSMaran Wilson // SPDX-License-Identifier: GPL-2.0
28cee3974SMaran Wilson #include <linux/acpi.h>
39c11112cSJan Beulich #include <linux/export.h>
438620fc4SRoger Pau Monne #include <linux/mm.h>
58cee3974SMaran Wilson
6a43fb7daSMaran Wilson #include <xen/hvc-console.h>
7a43fb7daSMaran Wilson
8103bf75fSThomas Zimmermann #include <asm/bootparam.h>
98cee3974SMaran Wilson #include <asm/io_apic.h>
108cee3974SMaran Wilson #include <asm/hypervisor.h>
11a43fb7daSMaran Wilson #include <asm/e820/api.h>
12*4c006734SRoger Pau Monne #include <asm/setup.h>
138cee3974SMaran Wilson
148cee3974SMaran Wilson #include <xen/xen.h>
158cee3974SMaran Wilson #include <asm/xen/interface.h>
168cee3974SMaran Wilson #include <asm/xen/hypercall.h>
174df7363eSMaran Wilson
18a43fb7daSMaran Wilson #include <xen/interface/memory.h>
19a43fb7daSMaran Wilson
2072813bfbSRoger Pau Monne #include "xen-ops.h"
2172813bfbSRoger Pau Monne
224df7363eSMaran Wilson /*
234df7363eSMaran Wilson * PVH variables.
244df7363eSMaran Wilson *
259c11112cSJan Beulich * The variable xen_pvh needs to live in a data segment since it is used
264df7363eSMaran Wilson * after startup_{32|64} is invoked, which will clear the .bss segment.
274df7363eSMaran Wilson */
289c11112cSJan Beulich bool __ro_after_init xen_pvh;
299c11112cSJan Beulich EXPORT_SYMBOL_GPL(xen_pvh);
308cee3974SMaran Wilson
3138620fc4SRoger Pau Monne /*
3238620fc4SRoger Pau Monne * Reserve e820 UNUSABLE regions to inflate the memory balloon.
3338620fc4SRoger Pau Monne *
3438620fc4SRoger Pau Monne * On PVH dom0 the host memory map is used, RAM regions available to dom0 are
3538620fc4SRoger Pau Monne * located as the same place as in the native memory map, but since dom0 gets
3638620fc4SRoger Pau Monne * less memory than the total amount of host RAM the ranges that can't be
3738620fc4SRoger Pau Monne * populated are converted from RAM -> UNUSABLE. Use such regions (up to the
3838620fc4SRoger Pau Monne * ratio signaled in EXTRA_MEM_RATIO) in order to inflate the balloon driver at
3938620fc4SRoger Pau Monne * boot. Doing so prevents the guest (even if just temporary) from using holes
4038620fc4SRoger Pau Monne * in the memory map in order to map grants or foreign addresses, and
4138620fc4SRoger Pau Monne * hopefully limits the risk of a clash with a device MMIO region. Ideally the
4238620fc4SRoger Pau Monne * hypervisor should notify us which memory ranges are suitable for creating
4338620fc4SRoger Pau Monne * foreign mappings, but that's not yet implemented.
4438620fc4SRoger Pau Monne */
pvh_reserve_extra_memory(void)45*4c006734SRoger Pau Monne static void __init pvh_reserve_extra_memory(void)
4638620fc4SRoger Pau Monne {
47*4c006734SRoger Pau Monne struct boot_params *bootp = &boot_params;
4838620fc4SRoger Pau Monne unsigned int i, ram_pages = 0, extra_pages;
4938620fc4SRoger Pau Monne
5038620fc4SRoger Pau Monne for (i = 0; i < bootp->e820_entries; i++) {
5138620fc4SRoger Pau Monne struct boot_e820_entry *e = &bootp->e820_table[i];
5238620fc4SRoger Pau Monne
5338620fc4SRoger Pau Monne if (e->type != E820_TYPE_RAM)
5438620fc4SRoger Pau Monne continue;
5538620fc4SRoger Pau Monne ram_pages += PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr);
5638620fc4SRoger Pau Monne }
5738620fc4SRoger Pau Monne
5838620fc4SRoger Pau Monne /* Max amount of extra memory. */
5938620fc4SRoger Pau Monne extra_pages = EXTRA_MEM_RATIO * ram_pages;
6038620fc4SRoger Pau Monne
6138620fc4SRoger Pau Monne /*
6238620fc4SRoger Pau Monne * Convert UNUSABLE ranges to RAM and reserve them for foreign mapping
6338620fc4SRoger Pau Monne * purposes.
6438620fc4SRoger Pau Monne */
6538620fc4SRoger Pau Monne for (i = 0; i < bootp->e820_entries && extra_pages; i++) {
6638620fc4SRoger Pau Monne struct boot_e820_entry *e = &bootp->e820_table[i];
6738620fc4SRoger Pau Monne unsigned long pages;
6838620fc4SRoger Pau Monne
6938620fc4SRoger Pau Monne if (e->type != E820_TYPE_UNUSABLE)
7038620fc4SRoger Pau Monne continue;
7138620fc4SRoger Pau Monne
7238620fc4SRoger Pau Monne pages = min(extra_pages,
7338620fc4SRoger Pau Monne PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr));
7438620fc4SRoger Pau Monne
7538620fc4SRoger Pau Monne if (pages != (PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr))) {
7638620fc4SRoger Pau Monne struct boot_e820_entry *next;
7738620fc4SRoger Pau Monne
7838620fc4SRoger Pau Monne if (bootp->e820_entries ==
7938620fc4SRoger Pau Monne ARRAY_SIZE(bootp->e820_table))
8038620fc4SRoger Pau Monne /* No space left to split - skip region. */
8138620fc4SRoger Pau Monne continue;
8238620fc4SRoger Pau Monne
8338620fc4SRoger Pau Monne /* Split entry. */
8438620fc4SRoger Pau Monne next = e + 1;
8538620fc4SRoger Pau Monne memmove(next, e,
8638620fc4SRoger Pau Monne (bootp->e820_entries - i) * sizeof(*e));
8738620fc4SRoger Pau Monne bootp->e820_entries++;
8838620fc4SRoger Pau Monne next->addr = PAGE_ALIGN(e->addr) + PFN_PHYS(pages);
8938620fc4SRoger Pau Monne e->size = next->addr - e->addr;
9038620fc4SRoger Pau Monne next->size -= e->size;
9138620fc4SRoger Pau Monne }
9238620fc4SRoger Pau Monne e->type = E820_TYPE_RAM;
9338620fc4SRoger Pau Monne extra_pages -= pages;
9438620fc4SRoger Pau Monne
9538620fc4SRoger Pau Monne xen_add_extra_mem(PFN_UP(e->addr), pages);
9638620fc4SRoger Pau Monne }
9738620fc4SRoger Pau Monne }
98fc05ea89SRoger Pau Monne
pvh_arch_setup(void)99*4c006734SRoger Pau Monne static void __init pvh_arch_setup(void)
100*4c006734SRoger Pau Monne {
101*4c006734SRoger Pau Monne pvh_reserve_extra_memory();
102*4c006734SRoger Pau Monne
103*4c006734SRoger Pau Monne if (xen_initial_domain())
104*4c006734SRoger Pau Monne xen_add_preferred_consoles();
105*4c006734SRoger Pau Monne }
106*4c006734SRoger Pau Monne
xen_pvh_init(struct boot_params * boot_params)107fc05ea89SRoger Pau Monne void __init xen_pvh_init(struct boot_params *boot_params)
108fc05ea89SRoger Pau Monne {
109fc05ea89SRoger Pau Monne u32 msr;
110fc05ea89SRoger Pau Monne u64 pfn;
111fc05ea89SRoger Pau Monne
112fc05ea89SRoger Pau Monne xen_pvh = 1;
113fc05ea89SRoger Pau Monne xen_domain_type = XEN_HVM_DOMAIN;
114fc05ea89SRoger Pau Monne xen_start_flags = pvh_start_info.flags;
115fc05ea89SRoger Pau Monne
116fc05ea89SRoger Pau Monne msr = cpuid_ebx(xen_cpuid_base() + 2);
117fc05ea89SRoger Pau Monne pfn = __pa(hypercall_page);
118fc05ea89SRoger Pau Monne wrmsr_safe(msr, (u32)pfn, (u32)(pfn >> 32));
119fc05ea89SRoger Pau Monne
120*4c006734SRoger Pau Monne x86_init.oem.arch_setup = pvh_arch_setup;
121fc05ea89SRoger Pau Monne x86_init.oem.banner = xen_banner;
122fc05ea89SRoger Pau Monne
123fc05ea89SRoger Pau Monne xen_efi_init(boot_params);
124fc05ea89SRoger Pau Monne
125fc05ea89SRoger Pau Monne if (xen_initial_domain()) {
126fc05ea89SRoger Pau Monne struct xen_platform_op op = {
127fc05ea89SRoger Pau Monne .cmd = XENPF_get_dom0_console,
128fc05ea89SRoger Pau Monne };
129fc05ea89SRoger Pau Monne int ret = HYPERVISOR_platform_op(&op);
130fc05ea89SRoger Pau Monne
131fc05ea89SRoger Pau Monne if (ret > 0)
132fc05ea89SRoger Pau Monne xen_init_vga(&op.u.dom0_console,
133fc05ea89SRoger Pau Monne min(ret * sizeof(char),
134fc05ea89SRoger Pau Monne sizeof(op.u.dom0_console)),
135fc05ea89SRoger Pau Monne &boot_params->screen_info);
136fc05ea89SRoger Pau Monne }
137fc05ea89SRoger Pau Monne }
138fc05ea89SRoger Pau Monne
mem_map_via_hcall(struct boot_params * boot_params_p)139fc05ea89SRoger Pau Monne void __init mem_map_via_hcall(struct boot_params *boot_params_p)
140fc05ea89SRoger Pau Monne {
141fc05ea89SRoger Pau Monne struct xen_memory_map memmap;
142fc05ea89SRoger Pau Monne int rc;
143fc05ea89SRoger Pau Monne
144fc05ea89SRoger Pau Monne memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
145fc05ea89SRoger Pau Monne set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
146fc05ea89SRoger Pau Monne rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
147fc05ea89SRoger Pau Monne if (rc) {
148fc05ea89SRoger Pau Monne xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
149fc05ea89SRoger Pau Monne BUG();
150fc05ea89SRoger Pau Monne }
151fc05ea89SRoger Pau Monne boot_params_p->e820_entries = memmap.nr_entries;
152fc05ea89SRoger Pau Monne }
153