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acdd0b6292
This version requires that host and guest have the same PAE status. NX cap is not offered to the guest, yet. Signed-off-by: Matias Zabaljauregui <zabaljauregui@gmail.com> Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
100 lines
2.7 KiB
C
100 lines
2.7 KiB
C
#ifndef _ASM_X86_LGUEST_H
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#define _ASM_X86_LGUEST_H
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#define GDT_ENTRY_LGUEST_CS 10
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#define GDT_ENTRY_LGUEST_DS 11
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#define LGUEST_CS (GDT_ENTRY_LGUEST_CS * 8)
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#define LGUEST_DS (GDT_ENTRY_LGUEST_DS * 8)
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#ifndef __ASSEMBLY__
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#include <asm/desc.h>
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#define GUEST_PL 1
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/* Every guest maps the core switcher code. */
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#define SHARED_SWITCHER_PAGES \
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DIV_ROUND_UP(end_switcher_text - start_switcher_text, PAGE_SIZE)
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/* Pages for switcher itself, then two pages per cpu */
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#define TOTAL_SWITCHER_PAGES (SHARED_SWITCHER_PAGES + 2 * nr_cpu_ids)
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/* We map at -4M (-2M when PAE is activated) for ease of mapping
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* into the guest (one PTE page). */
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#ifdef CONFIG_X86_PAE
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#define SWITCHER_ADDR 0xFFE00000
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#else
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#define SWITCHER_ADDR 0xFFC00000
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#endif
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/* Found in switcher.S */
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extern unsigned long default_idt_entries[];
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/* Declarations for definitions in lguest_guest.S */
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extern char lguest_noirq_start[], lguest_noirq_end[];
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extern const char lgstart_cli[], lgend_cli[];
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extern const char lgstart_sti[], lgend_sti[];
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extern const char lgstart_popf[], lgend_popf[];
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extern const char lgstart_pushf[], lgend_pushf[];
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extern const char lgstart_iret[], lgend_iret[];
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extern void lguest_iret(void);
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extern void lguest_init(void);
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struct lguest_regs {
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/* Manually saved part. */
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unsigned long eax, ebx, ecx, edx;
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unsigned long esi, edi, ebp;
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unsigned long gs;
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unsigned long fs, ds, es;
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unsigned long trapnum, errcode;
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/* Trap pushed part */
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unsigned long eip;
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unsigned long cs;
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unsigned long eflags;
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unsigned long esp;
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unsigned long ss;
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};
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/* This is a guest-specific page (mapped ro) into the guest. */
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struct lguest_ro_state {
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/* Host information we need to restore when we switch back. */
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u32 host_cr3;
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struct desc_ptr host_idt_desc;
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struct desc_ptr host_gdt_desc;
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u32 host_sp;
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/* Fields which are used when guest is running. */
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struct desc_ptr guest_idt_desc;
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struct desc_ptr guest_gdt_desc;
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struct x86_hw_tss guest_tss;
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struct desc_struct guest_idt[IDT_ENTRIES];
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struct desc_struct guest_gdt[GDT_ENTRIES];
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};
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struct lg_cpu_arch {
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/* The GDT entries copied into lguest_ro_state when running. */
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struct desc_struct gdt[GDT_ENTRIES];
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/* The IDT entries: some copied into lguest_ro_state when running. */
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struct desc_struct idt[IDT_ENTRIES];
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/* The address of the last guest-visible pagefault (ie. cr2). */
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unsigned long last_pagefault;
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};
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static inline void lguest_set_ts(void)
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{
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u32 cr0;
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cr0 = read_cr0();
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if (!(cr0 & 8))
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write_cr0(cr0 | 8);
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}
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/* Full 4G segment descriptors, suitable for CS and DS. */
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#define FULL_EXEC_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9b00} } })
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#define FULL_SEGMENT ((struct desc_struct){ { {0x0000ffff, 0x00cf9300} } })
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_X86_LGUEST_H */
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