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https://github.com/AuxXxilium/linux_dsm_epyc7002.git
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e2a81baf66
64-bit Xen supports sysenter for 32-bit guests, so support its use. (sysenter is faster than int $0x80 in 32-on-64.) sysexit is still not supported, so we fake it up using iret. Signed-off-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Ingo Molnar <mingo@elte.hu> Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
133 lines
3.2 KiB
C
133 lines
3.2 KiB
C
/*
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* Machine specific setup for xen
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*
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* Jeremy Fitzhardinge <jeremy@xensource.com>, XenSource Inc, 2007
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*/
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#include <linux/module.h>
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#include <linux/sched.h>
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#include <linux/mm.h>
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#include <linux/pm.h>
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#include <asm/elf.h>
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#include <asm/vdso.h>
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#include <asm/e820.h>
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#include <asm/setup.h>
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#include <asm/xen/hypervisor.h>
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#include <asm/xen/hypercall.h>
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#include <xen/interface/callback.h>
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#include <xen/interface/physdev.h>
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#include <xen/features.h>
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#include "xen-ops.h"
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#include "vdso.h"
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/* These are code, but not functions. Defined in entry.S */
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extern const char xen_hypervisor_callback[];
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extern const char xen_failsafe_callback[];
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unsigned long *phys_to_machine_mapping;
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EXPORT_SYMBOL(phys_to_machine_mapping);
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/**
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* machine_specific_memory_setup - Hook for machine specific memory setup.
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**/
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char * __init xen_memory_setup(void)
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{
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unsigned long max_pfn = xen_start_info->nr_pages;
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e820.nr_map = 0;
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add_memory_region(0, LOWMEMSIZE(), E820_RAM);
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add_memory_region(HIGH_MEMORY, PFN_PHYS(max_pfn)-HIGH_MEMORY, E820_RAM);
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return "Xen";
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}
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static void xen_idle(void)
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{
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local_irq_disable();
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if (need_resched())
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local_irq_enable();
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else {
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current_thread_info()->status &= ~TS_POLLING;
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smp_mb__after_clear_bit();
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safe_halt();
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current_thread_info()->status |= TS_POLLING;
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}
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}
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/*
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* Set the bit indicating "nosegneg" library variants should be used.
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*/
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static void __init fiddle_vdso(void)
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{
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extern const char vdso32_default_start;
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u32 *mask = VDSO32_SYMBOL(&vdso32_default_start, NOTE_MASK);
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*mask |= 1 << VDSO_NOTE_NONEGSEG_BIT;
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}
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void xen_enable_sysenter(void)
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{
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int cpu = smp_processor_id();
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extern void xen_sysenter_target(void);
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/* Mask events on entry, even though they get enabled immediately */
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static struct callback_register sysenter = {
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.type = CALLBACKTYPE_sysenter,
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.address = { __KERNEL_CS, (unsigned long)xen_sysenter_target },
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.flags = CALLBACKF_mask_events,
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};
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if (!boot_cpu_has(X86_FEATURE_SEP) ||
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HYPERVISOR_callback_op(CALLBACKOP_register, &sysenter) != 0) {
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clear_cpu_cap(&cpu_data(cpu), X86_FEATURE_SEP);
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clear_cpu_cap(&boot_cpu_data, X86_FEATURE_SEP);
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}
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}
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void __init xen_arch_setup(void)
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{
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struct physdev_set_iopl set_iopl;
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int rc;
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HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_4gb_segments);
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HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_writable_pagetables);
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if (!xen_feature(XENFEAT_auto_translated_physmap))
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HYPERVISOR_vm_assist(VMASST_CMD_enable, VMASST_TYPE_pae_extended_cr3);
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HYPERVISOR_set_callbacks(__KERNEL_CS, (unsigned long)xen_hypervisor_callback,
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__KERNEL_CS, (unsigned long)xen_failsafe_callback);
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xen_enable_sysenter();
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set_iopl.iopl = 1;
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rc = HYPERVISOR_physdev_op(PHYSDEVOP_set_iopl, &set_iopl);
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if (rc != 0)
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printk(KERN_INFO "physdev_op failed %d\n", rc);
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#ifdef CONFIG_ACPI
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if (!(xen_start_info->flags & SIF_INITDOMAIN)) {
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printk(KERN_INFO "ACPI in unprivileged domain disabled\n");
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disable_acpi();
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}
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#endif
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memcpy(boot_command_line, xen_start_info->cmd_line,
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MAX_GUEST_CMDLINE > COMMAND_LINE_SIZE ?
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COMMAND_LINE_SIZE : MAX_GUEST_CMDLINE);
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pm_idle = xen_idle;
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#ifdef CONFIG_SMP
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/* fill cpus_possible with all available cpus */
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xen_fill_possible_map();
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#endif
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paravirt_disable_iospace();
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fiddle_vdso();
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}
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