[linux-block.git] / arch / x86 / xen / enlighten_pvh.c

// SPDX-License-Identifier: GPL-2.0
#include <linux/acpi.h>
#include <linux/cpufreq.h>
#include <linux/cpuidle.h>
#include <linux/export.h>
#include <linux/mm.h>

#include <xen/hvc-console.h>
#include <xen/acpi.h>

#include <asm/bootparam.h>
#include <asm/io_apic.h>
#include <asm/hypervisor.h>
#include <asm/e820/api.h>
#include <asm/setup.h>

#include <xen/xen.h>
#include <asm/xen/interface.h>
#include <asm/xen/hypercall.h>

#include <xen/interface/memory.h>

#include "xen-ops.h"

/*
 * PVH variables.
 *
 * The variable xen_pvh needs to live in a data segment since it is used
 * after startup_{32|64} is invoked, which will clear the .bss segment.
 */
bool __ro_after_init xen_pvh;
EXPORT_SYMBOL_GPL(xen_pvh);

#ifdef CONFIG_XEN_DOM0
int xen_pvh_setup_gsi(int gsi, int trigger, int polarity)
{
	int ret;
	struct physdev_setup_gsi setup_gsi;

	setup_gsi.gsi = gsi;
	setup_gsi.triggering = (trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);

	ret = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	if (ret == -EEXIST) {
		xen_raw_printk("Already setup the GSI :%d\n", gsi);
		ret = 0;
	} else if (ret)
		xen_raw_printk("Fail to setup GSI (%d)!\n", gsi);

	return ret;
}
EXPORT_SYMBOL_GPL(xen_pvh_setup_gsi);
#endif

/*
 * Reserve e820 UNUSABLE regions to inflate the memory balloon.
 *
 * On PVH dom0 the host memory map is used, RAM regions available to dom0 are
 * located as the same place as in the native memory map, but since dom0 gets
 * less memory than the total amount of host RAM the ranges that can't be
 * populated are converted from RAM -> UNUSABLE.  Use such regions (up to the
 * ratio signaled in EXTRA_MEM_RATIO) in order to inflate the balloon driver at
 * boot.  Doing so prevents the guest (even if just temporary) from using holes
 * in the memory map in order to map grants or foreign addresses, and
 * hopefully limits the risk of a clash with a device MMIO region.  Ideally the
 * hypervisor should notify us which memory ranges are suitable for creating
 * foreign mappings, but that's not yet implemented.
 */
static void __init pvh_reserve_extra_memory(void)
{
	struct boot_params *bootp = &boot_params;
	unsigned int i, ram_pages = 0, extra_pages;

	for (i = 0; i < bootp->e820_entries; i++) {
		struct boot_e820_entry *e = &bootp->e820_table[i];

		if (e->type != E820_TYPE_RAM)
			continue;
		ram_pages += PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr);
	}

	/* Max amount of extra memory. */
	extra_pages = EXTRA_MEM_RATIO * ram_pages;

	/*
	 * Convert UNUSABLE ranges to RAM and reserve them for foreign mapping
	 * purposes.
	 */
	for (i = 0; i < bootp->e820_entries && extra_pages; i++) {
		struct boot_e820_entry *e = &bootp->e820_table[i];
		unsigned long pages;

		if (e->type != E820_TYPE_UNUSABLE)
			continue;

		pages = min(extra_pages,
			PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr));

		if (pages != (PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr))) {
			struct boot_e820_entry *next;

			if (bootp->e820_entries ==
			    ARRAY_SIZE(bootp->e820_table))
				/* No space left to split - skip region. */
				continue;

			/* Split entry. */
			next = e + 1;
			memmove(next, e,
				(bootp->e820_entries - i) * sizeof(*e));
			bootp->e820_entries++;
			next->addr = PAGE_ALIGN(e->addr) + PFN_PHYS(pages);
			e->size = next->addr - e->addr;
			next->size -= e->size;
		}
		e->type = E820_TYPE_RAM;
		extra_pages -= pages;

		xen_add_extra_mem(PFN_UP(e->addr), pages);
	}
}

static void __init pvh_arch_setup(void)
{
	pvh_reserve_extra_memory();

	if (xen_initial_domain()) {
		xen_add_preferred_consoles();

		/*
		 * Disable usage of CPU idle and frequency drivers: when
		 * running as hardware domain the exposed native ACPI tables
		 * causes idle and/or frequency drivers to attach and
		 * malfunction.  It's Xen the entity that controls the idle and
		 * frequency states.
		 *
		 * For unprivileged domains the exposed ACPI tables are
		 * fabricated and don't contain such data.
		 */
		disable_cpuidle();
		disable_cpufreq();
		WARN_ON(xen_set_default_idle());
	}
}

void __init xen_pvh_init(struct boot_params *boot_params)
{
	xen_pvh = 1;
	xen_domain_type = XEN_HVM_DOMAIN;
	xen_start_flags = pvh_start_info.flags;

	x86_init.oem.arch_setup = pvh_arch_setup;
	x86_init.oem.banner = xen_banner;

	xen_efi_init(boot_params);

	if (xen_initial_domain()) {
		struct xen_platform_op op = {
			.cmd = XENPF_get_dom0_console,
		};
		int ret = HYPERVISOR_platform_op(&op);

		if (ret > 0)
			xen_init_vga(&op.u.dom0_console,
				     min(ret * sizeof(char),
					 sizeof(op.u.dom0_console)),
				     &boot_params->screen_info);
	}
}

void __init mem_map_via_hcall(struct boot_params *boot_params_p)
{
	struct xen_memory_map memmap;
	int rc;

	memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
	set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
	rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
	if (rc) {
		xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
		BUG();
	}
	boot_params_p->e820_entries = memmap.nr_entries;
}
Commit	Line	Data
	1	// SPDX-License-Identifier: GPL-2.0
	2	#include <linux/acpi.h>
	3	#include <linux/cpufreq.h>
	4	#include <linux/cpuidle.h>
	5	#include <linux/export.h>
	6	#include <linux/mm.h>
	7
	8	#include <xen/hvc-console.h>
	9	#include <xen/acpi.h>
	10
	11	#include <asm/bootparam.h>
	12	#include <asm/io_apic.h>
	13	#include <asm/hypervisor.h>
	14	#include <asm/e820/api.h>
	15	#include <asm/setup.h>
	16
	17	#include <xen/xen.h>
	18	#include <asm/xen/interface.h>
	19	#include <asm/xen/hypercall.h>
	20
	21	#include <xen/interface/memory.h>
	22
	23	#include "xen-ops.h"
	24
	25	/*
	26	* PVH variables.
	27	*
	28	* The variable xen_pvh needs to live in a data segment since it is used
	29	* after startup_{32\|64} is invoked, which will clear the .bss segment.
	30	*/
	31	bool __ro_after_init xen_pvh;
	32	EXPORT_SYMBOL_GPL(xen_pvh);
	33
	34	#ifdef CONFIG_XEN_DOM0
	35	int xen_pvh_setup_gsi(int gsi, int trigger, int polarity)
	36	{
	37	int ret;
	38	struct physdev_setup_gsi setup_gsi;
	39
	40	setup_gsi.gsi = gsi;
	41	setup_gsi.triggering = (trigger == ACPI_EDGE_SENSITIVE ? 0 : 1);
	42	setup_gsi.polarity = (polarity == ACPI_ACTIVE_HIGH ? 0 : 1);
	43
	44	ret = HYPERVISOR_physdev_op(PHYSDEVOP_setup_gsi, &setup_gsi);
	45	if (ret == -EEXIST) {
	46	xen_raw_printk("Already setup the GSI :%d\n", gsi);
	47	ret = 0;
	48	} else if (ret)
	49	xen_raw_printk("Fail to setup GSI (%d)!\n", gsi);
	50
	51	return ret;
	52	}
	53	EXPORT_SYMBOL_GPL(xen_pvh_setup_gsi);
	54	#endif
	55
	56	/*
	57	* Reserve e820 UNUSABLE regions to inflate the memory balloon.
	58	*
	59	* On PVH dom0 the host memory map is used, RAM regions available to dom0 are
	60	* located as the same place as in the native memory map, but since dom0 gets
	61	* less memory than the total amount of host RAM the ranges that can't be
	62	* populated are converted from RAM -> UNUSABLE. Use such regions (up to the
	63	* ratio signaled in EXTRA_MEM_RATIO) in order to inflate the balloon driver at
	64	* boot. Doing so prevents the guest (even if just temporary) from using holes
	65	* in the memory map in order to map grants or foreign addresses, and
	66	* hopefully limits the risk of a clash with a device MMIO region. Ideally the
	67	* hypervisor should notify us which memory ranges are suitable for creating
	68	* foreign mappings, but that's not yet implemented.
	69	*/
	70	static void __init pvh_reserve_extra_memory(void)
	71	{
	72	struct boot_params *bootp = &boot_params;
	73	unsigned int i, ram_pages = 0, extra_pages;
	74
	75	for (i = 0; i < bootp->e820_entries; i++) {
	76	struct boot_e820_entry *e = &bootp->e820_table[i];
	77
	78	if (e->type != E820_TYPE_RAM)
	79	continue;
	80	ram_pages += PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr);
	81	}
	82
	83	/* Max amount of extra memory. */
	84	extra_pages = EXTRA_MEM_RATIO * ram_pages;
	85
	86	/*
	87	* Convert UNUSABLE ranges to RAM and reserve them for foreign mapping
	88	* purposes.
	89	*/
	90	for (i = 0; i < bootp->e820_entries && extra_pages; i++) {
	91	struct boot_e820_entry *e = &bootp->e820_table[i];
	92	unsigned long pages;
	93
	94	if (e->type != E820_TYPE_UNUSABLE)
	95	continue;
	96
	97	pages = min(extra_pages,
	98	PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr));
	99
	100	if (pages != (PFN_DOWN(e->addr + e->size) - PFN_UP(e->addr))) {
	101	struct boot_e820_entry *next;
	102
	103	if (bootp->e820_entries ==
	104	ARRAY_SIZE(bootp->e820_table))
	105	/* No space left to split - skip region. */
	106	continue;
	107
	108	/* Split entry. */
	109	next = e + 1;
	110	memmove(next, e,
	111	(bootp->e820_entries - i) * sizeof(*e));
	112	bootp->e820_entries++;
	113	next->addr = PAGE_ALIGN(e->addr) + PFN_PHYS(pages);
	114	e->size = next->addr - e->addr;
	115	next->size -= e->size;
	116	}
	117	e->type = E820_TYPE_RAM;
	118	extra_pages -= pages;
	119
	120	xen_add_extra_mem(PFN_UP(e->addr), pages);
	121	}
	122	}
	123
	124	static void __init pvh_arch_setup(void)
	125	{
	126	pvh_reserve_extra_memory();
	127
	128	if (xen_initial_domain()) {
	129	xen_add_preferred_consoles();
	130
	131	/*
	132	* Disable usage of CPU idle and frequency drivers: when
	133	* running as hardware domain the exposed native ACPI tables
	134	* causes idle and/or frequency drivers to attach and
	135	* malfunction. It's Xen the entity that controls the idle and
	136	* frequency states.
	137	*
	138	* For unprivileged domains the exposed ACPI tables are
	139	* fabricated and don't contain such data.
	140	*/
	141	disable_cpuidle();
	142	disable_cpufreq();
	143	WARN_ON(xen_set_default_idle());
	144	}
	145	}
	146
	147	void __init xen_pvh_init(struct boot_params *boot_params)
	148	{
	149	xen_pvh = 1;
	150	xen_domain_type = XEN_HVM_DOMAIN;
	151	xen_start_flags = pvh_start_info.flags;
	152
	153	x86_init.oem.arch_setup = pvh_arch_setup;
	154	x86_init.oem.banner = xen_banner;
	155
	156	xen_efi_init(boot_params);
	157
	158	if (xen_initial_domain()) {
	159	struct xen_platform_op op = {
	160	.cmd = XENPF_get_dom0_console,
	161	};
	162	int ret = HYPERVISOR_platform_op(&op);
	163
	164	if (ret > 0)
	165	xen_init_vga(&op.u.dom0_console,
	166	min(ret * sizeof(char),
	167	sizeof(op.u.dom0_console)),
	168	&boot_params->screen_info);
	169	}
	170	}
	171
	172	void __init mem_map_via_hcall(struct boot_params *boot_params_p)
	173	{
	174	struct xen_memory_map memmap;
	175	int rc;
	176
	177	memmap.nr_entries = ARRAY_SIZE(boot_params_p->e820_table);
	178	set_xen_guest_handle(memmap.buffer, boot_params_p->e820_table);
	179	rc = HYPERVISOR_memory_op(XENMEM_memory_map, &memmap);
	180	if (rc) {
	181	xen_raw_printk("XENMEM_memory_map failed (%d)\n", rc);
	182	BUG();
	183	}
	184	boot_params_p->e820_entries = memmap.nr_entries;
	185	}