lguest: the guest code
lguest is a simple hypervisor for Linux on Linux. Unlike kvm it doesn't need VT/SVM hardware. Unlike Xen it's simply "modprobe and go". Unlike both, it's 5000 lines and self-contained. Performance is ok, but not great (-30% on kernel compile). But given its hackability, I expect this to improve, along with the paravirt_ops code which it supplies a complete example for. There's also a 64-bit version being worked on and other craziness. But most of all, lguest is awesome fun! Too much of the kernel is a big ball of hair. lguest is simple enough to dive into and hack, plus has some warts which scream "fork me!". This patch: This is the code and headers required to make an i386 kernel an lguest guest. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Andi Kleen <ak@suse.de> Cc: Jeremy Fitzhardinge <jeremy@goop.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>hifive-unleashed-5.1
Rusty Russell
Linus Torvalds
parent
5992b6dac0
commit
07ad157f6e
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@ -0,0 +1,544 @@
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/*
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* Lguest specific paravirt-ops implementation
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*
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* Copyright (C) 2006, Rusty Russell <rusty@rustcorp.com.au> IBM Corporation.
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*
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* This program is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation; either version 2 of the License, or
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* (at your option) any later version.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
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* NON INFRINGEMENT. See the GNU General Public License for more
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* details.
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*
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* You should have received a copy of the GNU General Public License
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* along with this program; if not, write to the Free Software
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* Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
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*/
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#include <linux/kernel.h>
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#include <linux/start_kernel.h>
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#include <linux/string.h>
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#include <linux/console.h>
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#include <linux/screen_info.h>
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#include <linux/irq.h>
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#include <linux/interrupt.h>
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#include <linux/lguest.h>
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#include <linux/lguest_launcher.h>
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#include <linux/lguest_bus.h>
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#include <asm/paravirt.h>
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#include <asm/param.h>
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#include <asm/page.h>
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#include <asm/pgtable.h>
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#include <asm/desc.h>
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#include <asm/setup.h>
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#include <asm/e820.h>
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#include <asm/mce.h>
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#include <asm/io.h>
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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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struct lguest_data lguest_data = {
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.hcall_status = { [0 ... LHCALL_RING_SIZE-1] = 0xFF },
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.noirq_start = (u32)lguest_noirq_start,
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.noirq_end = (u32)lguest_noirq_end,
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.blocked_interrupts = { 1 }, /* Block timer interrupts */
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};
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struct lguest_device_desc *lguest_devices;
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static __initdata const struct lguest_boot_info *boot = __va(0);
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static enum paravirt_lazy_mode lazy_mode;
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static void lguest_lazy_mode(enum paravirt_lazy_mode mode)
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{
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if (mode == PARAVIRT_LAZY_FLUSH) {
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if (unlikely(lazy_mode != PARAVIRT_LAZY_NONE))
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hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
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} else {
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lazy_mode = mode;
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if (mode == PARAVIRT_LAZY_NONE)
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hcall(LHCALL_FLUSH_ASYNC, 0, 0, 0);
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}
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}
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static void lazy_hcall(unsigned long call,
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unsigned long arg1,
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unsigned long arg2,
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unsigned long arg3)
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{
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if (lazy_mode == PARAVIRT_LAZY_NONE)
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hcall(call, arg1, arg2, arg3);
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else
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async_hcall(call, arg1, arg2, arg3);
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}
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void async_hcall(unsigned long call,
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unsigned long arg1, unsigned long arg2, unsigned long arg3)
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{
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/* Note: This code assumes we're uniprocessor. */
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static unsigned int next_call;
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unsigned long flags;
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local_irq_save(flags);
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if (lguest_data.hcall_status[next_call] != 0xFF) {
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/* Table full, so do normal hcall which will flush table. */
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hcall(call, arg1, arg2, arg3);
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} else {
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lguest_data.hcalls[next_call].eax = call;
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lguest_data.hcalls[next_call].edx = arg1;
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lguest_data.hcalls[next_call].ebx = arg2;
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lguest_data.hcalls[next_call].ecx = arg3;
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/* Make sure host sees arguments before "valid" flag. */
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wmb();
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lguest_data.hcall_status[next_call] = 0;
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if (++next_call == LHCALL_RING_SIZE)
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next_call = 0;
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}
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local_irq_restore(flags);
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}
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void lguest_send_dma(unsigned long key, struct lguest_dma *dma)
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{
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dma->used_len = 0;
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hcall(LHCALL_SEND_DMA, key, __pa(dma), 0);
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}
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int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
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unsigned int num, u8 irq)
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{
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if (!hcall(LHCALL_BIND_DMA, key, __pa(dmas), (num << 8) | irq))
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return -ENOMEM;
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return 0;
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}
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void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas)
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{
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hcall(LHCALL_BIND_DMA, key, __pa(dmas), 0);
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}
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/* For guests, device memory can be used as normal memory, so we cast away the
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* __iomem to quieten sparse. */
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void *lguest_map(unsigned long phys_addr, unsigned long pages)
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{
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return (__force void *)ioremap(phys_addr, PAGE_SIZE*pages);
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}
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void lguest_unmap(void *addr)
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{
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iounmap((__force void __iomem *)addr);
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}
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static unsigned long save_fl(void)
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{
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return lguest_data.irq_enabled;
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}
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static void restore_fl(unsigned long flags)
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{
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/* FIXME: Check if interrupt pending... */
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lguest_data.irq_enabled = flags;
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}
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static void irq_disable(void)
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{
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lguest_data.irq_enabled = 0;
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}
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static void irq_enable(void)
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{
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/* FIXME: Check if interrupt pending... */
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lguest_data.irq_enabled = X86_EFLAGS_IF;
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}
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static void lguest_write_idt_entry(struct desc_struct *dt,
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int entrynum, u32 low, u32 high)
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{
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write_dt_entry(dt, entrynum, low, high);
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hcall(LHCALL_LOAD_IDT_ENTRY, entrynum, low, high);
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}
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static void lguest_load_idt(const struct Xgt_desc_struct *desc)
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{
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unsigned int i;
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struct desc_struct *idt = (void *)desc->address;
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for (i = 0; i < (desc->size+1)/8; i++)
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hcall(LHCALL_LOAD_IDT_ENTRY, i, idt[i].a, idt[i].b);
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}
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static void lguest_load_gdt(const struct Xgt_desc_struct *desc)
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{
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BUG_ON((desc->size+1)/8 != GDT_ENTRIES);
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hcall(LHCALL_LOAD_GDT, __pa(desc->address), GDT_ENTRIES, 0);
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}
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static void lguest_write_gdt_entry(struct desc_struct *dt,
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int entrynum, u32 low, u32 high)
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{
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write_dt_entry(dt, entrynum, low, high);
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hcall(LHCALL_LOAD_GDT, __pa(dt), GDT_ENTRIES, 0);
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}
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static void lguest_load_tls(struct thread_struct *t, unsigned int cpu)
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{
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lazy_hcall(LHCALL_LOAD_TLS, __pa(&t->tls_array), cpu, 0);
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}
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static void lguest_set_ldt(const void *addr, unsigned entries)
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{
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}
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static void lguest_load_tr_desc(void)
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{
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}
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static void lguest_cpuid(unsigned int *eax, unsigned int *ebx,
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unsigned int *ecx, unsigned int *edx)
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{
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int function = *eax;
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native_cpuid(eax, ebx, ecx, edx);
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switch (function) {
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case 1: /* Basic feature request. */
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/* We only allow kernel to see SSE3, CMPXCHG16B and SSSE3 */
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*ecx &= 0x00002201;
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/* Similarly: SSE, SSE2, FXSR, MMX, CMOV, CMPXCHG8B, FPU. */
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*edx &= 0x07808101;
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/* Host wants to know when we flush kernel pages: set PGE. */
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*edx |= 0x00002000;
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break;
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case 0x80000000:
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/* Futureproof this a little: if they ask how much extended
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* processor information, limit it to known fields. */
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if (*eax > 0x80000008)
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*eax = 0x80000008;
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break;
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}
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}
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static unsigned long current_cr0, current_cr3;
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static void lguest_write_cr0(unsigned long val)
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{
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lazy_hcall(LHCALL_TS, val & 8, 0, 0);
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current_cr0 = val;
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}
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static unsigned long lguest_read_cr0(void)
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{
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return current_cr0;
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}
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static void lguest_clts(void)
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{
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lazy_hcall(LHCALL_TS, 0, 0, 0);
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current_cr0 &= ~8U;
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}
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static unsigned long lguest_read_cr2(void)
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{
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return lguest_data.cr2;
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}
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static void lguest_write_cr3(unsigned long cr3)
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{
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lazy_hcall(LHCALL_NEW_PGTABLE, cr3, 0, 0);
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current_cr3 = cr3;
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}
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static unsigned long lguest_read_cr3(void)
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{
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return current_cr3;
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}
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/* Used to enable/disable PGE, but we don't care. */
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static unsigned long lguest_read_cr4(void)
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{
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return 0;
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}
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static void lguest_write_cr4(unsigned long val)
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{
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}
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static void lguest_set_pte_at(struct mm_struct *mm, unsigned long addr,
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pte_t *ptep, pte_t pteval)
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{
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*ptep = pteval;
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lazy_hcall(LHCALL_SET_PTE, __pa(mm->pgd), addr, pteval.pte_low);
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}
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/* We only support two-level pagetables at the moment. */
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static void lguest_set_pmd(pmd_t *pmdp, pmd_t pmdval)
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{
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*pmdp = pmdval;
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lazy_hcall(LHCALL_SET_PMD, __pa(pmdp)&PAGE_MASK,
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(__pa(pmdp)&(PAGE_SIZE-1))/4, 0);
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}
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/* FIXME: Eliminate all callers of this. */
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static void lguest_set_pte(pte_t *ptep, pte_t pteval)
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{
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*ptep = pteval;
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/* Don't bother with hypercall before initial setup. */
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if (current_cr3)
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lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0);
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}
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static void lguest_flush_tlb_single(unsigned long addr)
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{
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/* Simply set it to zero, and it will fault back in. */
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lazy_hcall(LHCALL_SET_PTE, current_cr3, addr, 0);
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}
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static void lguest_flush_tlb_user(void)
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{
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lazy_hcall(LHCALL_FLUSH_TLB, 0, 0, 0);
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}
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static void lguest_flush_tlb_kernel(void)
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{
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lazy_hcall(LHCALL_FLUSH_TLB, 1, 0, 0);
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}
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static void disable_lguest_irq(unsigned int irq)
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{
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set_bit(irq, lguest_data.blocked_interrupts);
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}
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static void enable_lguest_irq(unsigned int irq)
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{
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clear_bit(irq, lguest_data.blocked_interrupts);
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/* FIXME: If it's pending? */
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}
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static struct irq_chip lguest_irq_controller = {
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.name = "lguest",
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.mask = disable_lguest_irq,
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.mask_ack = disable_lguest_irq,
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.unmask = enable_lguest_irq,
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};
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static void __init lguest_init_IRQ(void)
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{
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unsigned int i;
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for (i = 0; i < LGUEST_IRQS; i++) {
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int vector = FIRST_EXTERNAL_VECTOR + i;
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if (vector != SYSCALL_VECTOR) {
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set_intr_gate(vector, interrupt[i]);
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set_irq_chip_and_handler(i, &lguest_irq_controller,
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handle_level_irq);
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}
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}
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irq_ctx_init(smp_processor_id());
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}
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static unsigned long lguest_get_wallclock(void)
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{
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return hcall(LHCALL_GET_WALLCLOCK, 0, 0, 0);
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}
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static void lguest_time_irq(unsigned int irq, struct irq_desc *desc)
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{
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do_timer(hcall(LHCALL_TIMER_READ, 0, 0, 0));
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update_process_times(user_mode_vm(get_irq_regs()));
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}
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static u64 sched_clock_base;
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static void lguest_time_init(void)
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{
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set_irq_handler(0, lguest_time_irq);
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hcall(LHCALL_TIMER_READ, 0, 0, 0);
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sched_clock_base = jiffies_64;
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enable_lguest_irq(0);
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}
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static unsigned long long lguest_sched_clock(void)
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{
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return (jiffies_64 - sched_clock_base) * (1000000000 / HZ);
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}
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static void lguest_load_esp0(struct tss_struct *tss,
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struct thread_struct *thread)
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{
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lazy_hcall(LHCALL_SET_STACK, __KERNEL_DS|0x1, thread->esp0,
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THREAD_SIZE/PAGE_SIZE);
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}
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static void lguest_set_debugreg(int regno, unsigned long value)
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{
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/* FIXME: Implement */
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}
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static void lguest_wbinvd(void)
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{
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}
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#ifdef CONFIG_X86_LOCAL_APIC
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static void lguest_apic_write(unsigned long reg, unsigned long v)
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{
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}
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static unsigned long lguest_apic_read(unsigned long reg)
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{
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return 0;
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}
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#endif
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static void lguest_safe_halt(void)
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{
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hcall(LHCALL_HALT, 0, 0, 0);
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}
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static void lguest_power_off(void)
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{
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hcall(LHCALL_CRASH, __pa("Power down"), 0, 0);
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}
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static int lguest_panic(struct notifier_block *nb, unsigned long l, void *p)
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{
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hcall(LHCALL_CRASH, __pa(p), 0, 0);
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return NOTIFY_DONE;
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}
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static struct notifier_block paniced = {
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.notifier_call = lguest_panic
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};
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static __init char *lguest_memory_setup(void)
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{
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/* We do this here because lockcheck barfs if before start_kernel */
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atomic_notifier_chain_register(&panic_notifier_list, &paniced);
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e820.nr_map = 0;
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add_memory_region(0, PFN_PHYS(boot->max_pfn), E820_RAM);
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return "LGUEST";
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}
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static const struct lguest_insns
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{
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const char *start, *end;
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} lguest_insns[] = {
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[PARAVIRT_PATCH(irq_disable)] = { lgstart_cli, lgend_cli },
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[PARAVIRT_PATCH(irq_enable)] = { lgstart_sti, lgend_sti },
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[PARAVIRT_PATCH(restore_fl)] = { lgstart_popf, lgend_popf },
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[PARAVIRT_PATCH(save_fl)] = { lgstart_pushf, lgend_pushf },
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};
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static unsigned lguest_patch(u8 type, u16 clobber, void *insns, unsigned len)
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{
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unsigned int insn_len;
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/* Don't touch it if we don't have a replacement */
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if (type >= ARRAY_SIZE(lguest_insns) || !lguest_insns[type].start)
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return paravirt_patch_default(type, clobber, insns, len);
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insn_len = lguest_insns[type].end - lguest_insns[type].start;
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/* Similarly if we can't fit replacement. */
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if (len < insn_len)
|
||||
return paravirt_patch_default(type, clobber, insns, len);
|
||||
|
||||
memcpy(insns, lguest_insns[type].start, insn_len);
|
||||
return insn_len;
|
||||
}
|
||||
|
||||
__init void lguest_init(void)
|
||||
{
|
||||
paravirt_ops.name = "lguest";
|
||||
paravirt_ops.paravirt_enabled = 1;
|
||||
paravirt_ops.kernel_rpl = 1;
|
||||
|
||||
paravirt_ops.save_fl = save_fl;
|
||||
paravirt_ops.restore_fl = restore_fl;
|
||||
paravirt_ops.irq_disable = irq_disable;
|
||||
paravirt_ops.irq_enable = irq_enable;
|
||||
paravirt_ops.load_gdt = lguest_load_gdt;
|
||||
paravirt_ops.memory_setup = lguest_memory_setup;
|
||||
paravirt_ops.cpuid = lguest_cpuid;
|
||||
paravirt_ops.write_cr3 = lguest_write_cr3;
|
||||
paravirt_ops.flush_tlb_user = lguest_flush_tlb_user;
|
||||
paravirt_ops.flush_tlb_single = lguest_flush_tlb_single;
|
||||
paravirt_ops.flush_tlb_kernel = lguest_flush_tlb_kernel;
|
||||
paravirt_ops.set_pte = lguest_set_pte;
|
||||
paravirt_ops.set_pte_at = lguest_set_pte_at;
|
||||
paravirt_ops.set_pmd = lguest_set_pmd;
|
||||
#ifdef CONFIG_X86_LOCAL_APIC
|
||||
paravirt_ops.apic_write = lguest_apic_write;
|
||||
paravirt_ops.apic_write_atomic = lguest_apic_write;
|
||||
paravirt_ops.apic_read = lguest_apic_read;
|
||||
#endif
|
||||
paravirt_ops.load_idt = lguest_load_idt;
|
||||
paravirt_ops.iret = lguest_iret;
|
||||
paravirt_ops.load_esp0 = lguest_load_esp0;
|
||||
paravirt_ops.load_tr_desc = lguest_load_tr_desc;
|
||||
paravirt_ops.set_ldt = lguest_set_ldt;
|
||||
paravirt_ops.load_tls = lguest_load_tls;
|
||||
paravirt_ops.set_debugreg = lguest_set_debugreg;
|
||||
paravirt_ops.clts = lguest_clts;
|
||||
paravirt_ops.read_cr0 = lguest_read_cr0;
|
||||
paravirt_ops.write_cr0 = lguest_write_cr0;
|
||||
paravirt_ops.init_IRQ = lguest_init_IRQ;
|
||||
paravirt_ops.read_cr2 = lguest_read_cr2;
|
||||
paravirt_ops.read_cr3 = lguest_read_cr3;
|
||||
paravirt_ops.read_cr4 = lguest_read_cr4;
|
||||
paravirt_ops.write_cr4 = lguest_write_cr4;
|
||||
paravirt_ops.write_gdt_entry = lguest_write_gdt_entry;
|
||||
paravirt_ops.write_idt_entry = lguest_write_idt_entry;
|
||||
paravirt_ops.patch = lguest_patch;
|
||||
paravirt_ops.safe_halt = lguest_safe_halt;
|
||||
paravirt_ops.get_wallclock = lguest_get_wallclock;
|
||||
paravirt_ops.time_init = lguest_time_init;
|
||||
paravirt_ops.set_lazy_mode = lguest_lazy_mode;
|
||||
paravirt_ops.wbinvd = lguest_wbinvd;
|
||||
paravirt_ops.sched_clock = lguest_sched_clock;
|
||||
|
||||
hcall(LHCALL_LGUEST_INIT, __pa(&lguest_data), 0, 0);
|
||||
strncpy(boot_command_line, boot->cmdline, COMMAND_LINE_SIZE);
|
||||
|
||||
/* We use top of mem for initial pagetables. */
|
||||
init_pg_tables_end = __pa(pg0);
|
||||
|
||||
asm volatile ("mov %0, %%fs" : : "r" (__KERNEL_DS) : "memory");
|
||||
|
||||
reserve_top_address(lguest_data.reserve_mem);
|
||||
|
||||
lockdep_init();
|
||||
|
||||
paravirt_disable_iospace();
|
||||
|
||||
cpu_detect(&new_cpu_data);
|
||||
/* head.S usually sets up the first capability word, so do it here. */
|
||||
new_cpu_data.x86_capability[0] = cpuid_edx(1);
|
||||
|
||||
/* Math is always hard! */
|
||||
new_cpu_data.hard_math = 1;
|
||||
|
||||
#ifdef CONFIG_X86_MCE
|
||||
mce_disabled = 1;
|
||||
#endif
|
||||
|
||||
#ifdef CONFIG_ACPI
|
||||
acpi_disabled = 1;
|
||||
acpi_ht = 0;
|
||||
#endif
|
||||
|
||||
add_preferred_console("hvc", 0, NULL);
|
||||
|
||||
if (boot->initrd_size) {
|
||||
/* We stash this at top of memory. */
|
||||
INITRD_START = boot->max_pfn*PAGE_SIZE - boot->initrd_size;
|
||||
INITRD_SIZE = boot->initrd_size;
|
||||
LOADER_TYPE = 0xFF;
|
||||
}
|
||||
|
||||
pm_power_off = lguest_power_off;
|
||||
start_kernel();
|
||||
}
|
||||
|
|
@ -0,0 +1,53 @@
|
|||
#include <linux/linkage.h>
|
||||
#include <linux/lguest.h>
|
||||
#include <asm/asm-offsets.h>
|
||||
#include <asm/thread_info.h>
|
||||
|
||||
/* FIXME: Once asm/processor-flags.h goes in, include that */
|
||||
#define X86_EFLAGS_IF 0x00000200
|
||||
|
||||
/*
|
||||
* This is where we begin: we have a magic signature which the launcher looks
|
||||
* for. The plan is that the Linux boot protocol will be extended with a
|
||||
* "platform type" field which will guide us here from the normal entry point,
|
||||
* but for the moment this suffices.
|
||||
*
|
||||
* We put it in .init.text will be discarded after boot.
|
||||
*/
|
||||
.section .init.text, "ax", @progbits
|
||||
.ascii "GenuineLguest"
|
||||
/* Set up initial stack. */
|
||||
movl $(init_thread_union+THREAD_SIZE),%esp
|
||||
jmp lguest_init
|
||||
|
||||
/* The templates for inline patching. */
|
||||
#define LGUEST_PATCH(name, insns...) \
|
||||
lgstart_##name: insns; lgend_##name:; \
|
||||
.globl lgstart_##name; .globl lgend_##name
|
||||
|
||||
LGUEST_PATCH(cli, movl $0, lguest_data+LGUEST_DATA_irq_enabled)
|
||||
LGUEST_PATCH(sti, movl $X86_EFLAGS_IF, lguest_data+LGUEST_DATA_irq_enabled)
|
||||
LGUEST_PATCH(popf, movl %eax, lguest_data+LGUEST_DATA_irq_enabled)
|
||||
LGUEST_PATCH(pushf, movl lguest_data+LGUEST_DATA_irq_enabled, %eax)
|
||||
|
||||
.text
|
||||
/* These demark the EIP range where host should never deliver interrupts. */
|
||||
.global lguest_noirq_start
|
||||
.global lguest_noirq_end
|
||||
|
||||
/*
|
||||
* We move eflags word to lguest_data.irq_enabled to restore interrupt state.
|
||||
* For page faults, gpfs and virtual interrupts, the hypervisor has saved
|
||||
* eflags manually, otherwise it was delivered directly and so eflags reflects
|
||||
* the real machine IF state, ie. interrupts on. Since the kernel always dies
|
||||
* if it takes such a trap with interrupts disabled anyway, turning interrupts
|
||||
* back on unconditionally here is OK.
|
||||
*/
|
||||
ENTRY(lguest_iret)
|
||||
pushl %eax
|
||||
movl 12(%esp), %eax
|
||||
lguest_noirq_start:
|
||||
movl %eax,%ss:lguest_data+LGUEST_DATA_irq_enabled
|
||||
popl %eax
|
||||
iret
|
||||
lguest_noirq_end:
|
||||
|
|
@ -0,0 +1,148 @@
|
|||
#include <linux/init.h>
|
||||
#include <linux/bootmem.h>
|
||||
#include <linux/lguest_bus.h>
|
||||
#include <asm/io.h>
|
||||
|
||||
static ssize_t type_show(struct device *_dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
return sprintf(buf, "%hu", lguest_devices[dev->index].type);
|
||||
}
|
||||
static ssize_t features_show(struct device *_dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
return sprintf(buf, "%hx", lguest_devices[dev->index].features);
|
||||
}
|
||||
static ssize_t pfn_show(struct device *_dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
return sprintf(buf, "%u", lguest_devices[dev->index].pfn);
|
||||
}
|
||||
static ssize_t status_show(struct device *_dev,
|
||||
struct device_attribute *attr, char *buf)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
return sprintf(buf, "%hx", lguest_devices[dev->index].status);
|
||||
}
|
||||
static ssize_t status_store(struct device *_dev, struct device_attribute *attr,
|
||||
const char *buf, size_t count)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
if (sscanf(buf, "%hi", &lguest_devices[dev->index].status) != 1)
|
||||
return -EINVAL;
|
||||
return count;
|
||||
}
|
||||
static struct device_attribute lguest_dev_attrs[] = {
|
||||
__ATTR_RO(type),
|
||||
__ATTR_RO(features),
|
||||
__ATTR_RO(pfn),
|
||||
__ATTR(status, 0644, status_show, status_store),
|
||||
__ATTR_NULL
|
||||
};
|
||||
|
||||
static int lguest_dev_match(struct device *_dev, struct device_driver *_drv)
|
||||
{
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
struct lguest_driver *drv = container_of(_drv,struct lguest_driver,drv);
|
||||
|
||||
return (drv->device_type == lguest_devices[dev->index].type);
|
||||
}
|
||||
|
||||
struct lguest_bus {
|
||||
struct bus_type bus;
|
||||
struct device dev;
|
||||
};
|
||||
|
||||
static struct lguest_bus lguest_bus = {
|
||||
.bus = {
|
||||
.name = "lguest",
|
||||
.match = lguest_dev_match,
|
||||
.dev_attrs = lguest_dev_attrs,
|
||||
},
|
||||
.dev = {
|
||||
.parent = NULL,
|
||||
.bus_id = "lguest",
|
||||
}
|
||||
};
|
||||
|
||||
static int lguest_dev_probe(struct device *_dev)
|
||||
{
|
||||
int ret;
|
||||
struct lguest_device *dev = container_of(_dev,struct lguest_device,dev);
|
||||
struct lguest_driver *drv = container_of(dev->dev.driver,
|
||||
struct lguest_driver, drv);
|
||||
|
||||
lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER;
|
||||
ret = drv->probe(dev);
|
||||
if (ret == 0)
|
||||
lguest_devices[dev->index].status |= LGUEST_DEVICE_S_DRIVER_OK;
|
||||
return ret;
|
||||
}
|
||||
|
||||
int register_lguest_driver(struct lguest_driver *drv)
|
||||
{
|
||||
if (!lguest_devices)
|
||||
return 0;
|
||||
|
||||
drv->drv.bus = &lguest_bus.bus;
|
||||
drv->drv.name = drv->name;
|
||||
drv->drv.owner = drv->owner;
|
||||
drv->drv.probe = lguest_dev_probe;
|
||||
|
||||
return driver_register(&drv->drv);
|
||||
}
|
||||
EXPORT_SYMBOL_GPL(register_lguest_driver);
|
||||
|
||||
static void add_lguest_device(unsigned int index)
|
||||
{
|
||||
struct lguest_device *new;
|
||||
|
||||
lguest_devices[index].status |= LGUEST_DEVICE_S_ACKNOWLEDGE;
|
||||
new = kmalloc(sizeof(struct lguest_device), GFP_KERNEL);
|
||||
if (!new) {
|
||||
printk(KERN_EMERG "Cannot allocate lguest device %u\n", index);
|
||||
lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED;
|
||||
return;
|
||||
}
|
||||
|
||||
new->index = index;
|
||||
new->private = NULL;
|
||||
memset(&new->dev, 0, sizeof(new->dev));
|
||||
new->dev.parent = &lguest_bus.dev;
|
||||
new->dev.bus = &lguest_bus.bus;
|
||||
sprintf(new->dev.bus_id, "%u", index);
|
||||
if (device_register(&new->dev) != 0) {
|
||||
printk(KERN_EMERG "Cannot register lguest device %u\n", index);
|
||||
lguest_devices[index].status |= LGUEST_DEVICE_S_FAILED;
|
||||
kfree(new);
|
||||
}
|
||||
}
|
||||
|
||||
static void scan_devices(void)
|
||||
{
|
||||
unsigned int i;
|
||||
|
||||
for (i = 0; i < LGUEST_MAX_DEVICES; i++)
|
||||
if (lguest_devices[i].type)
|
||||
add_lguest_device(i);
|
||||
}
|
||||
|
||||
static int __init lguest_bus_init(void)
|
||||
{
|
||||
if (strcmp(paravirt_ops.name, "lguest") != 0)
|
||||
return 0;
|
||||
|
||||
/* Devices are in page above top of "normal" mem. */
|
||||
lguest_devices = lguest_map(max_pfn<<PAGE_SHIFT, 1);
|
||||
|
||||
if (bus_register(&lguest_bus.bus) != 0
|
||||
|| device_register(&lguest_bus.dev) != 0)
|
||||
panic("lguest bus registration failed");
|
||||
|
||||
scan_devices();
|
||||
return 0;
|
||||
}
|
||||
postcore_initcall(lguest_bus_init);
|
||||
|
|
@ -0,0 +1,85 @@
|
|||
/* Things the lguest guest needs to know. Note: like all lguest interfaces,
|
||||
* this is subject to wild and random change between versions. */
|
||||
#ifndef _ASM_LGUEST_H
|
||||
#define _ASM_LGUEST_H
|
||||
|
||||
/* These are randomly chosen numbers which indicate we're an lguest at boot */
|
||||
#define LGUEST_MAGIC_EBP 0x4C687970
|
||||
#define LGUEST_MAGIC_EDI 0x652D4D65
|
||||
#define LGUEST_MAGIC_ESI 0xFFFFFFFF
|
||||
|
||||
#ifndef __ASSEMBLY__
|
||||
#include <asm/irq.h>
|
||||
|
||||
#define LHCALL_FLUSH_ASYNC 0
|
||||
#define LHCALL_LGUEST_INIT 1
|
||||
#define LHCALL_CRASH 2
|
||||
#define LHCALL_LOAD_GDT 3
|
||||
#define LHCALL_NEW_PGTABLE 4
|
||||
#define LHCALL_FLUSH_TLB 5
|
||||
#define LHCALL_LOAD_IDT_ENTRY 6
|
||||
#define LHCALL_SET_STACK 7
|
||||
#define LHCALL_TS 8
|
||||
#define LHCALL_TIMER_READ 9
|
||||
#define LHCALL_HALT 10
|
||||
#define LHCALL_GET_WALLCLOCK 11
|
||||
#define LHCALL_BIND_DMA 12
|
||||
#define LHCALL_SEND_DMA 13
|
||||
#define LHCALL_SET_PTE 14
|
||||
#define LHCALL_SET_PMD 15
|
||||
#define LHCALL_LOAD_TLS 16
|
||||
|
||||
#define LGUEST_TRAP_ENTRY 0x1F
|
||||
|
||||
static inline unsigned long
|
||||
hcall(unsigned long call,
|
||||
unsigned long arg1, unsigned long arg2, unsigned long arg3)
|
||||
{
|
||||
asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
|
||||
: "=a"(call)
|
||||
: "a"(call), "d"(arg1), "b"(arg2), "c"(arg3)
|
||||
: "memory");
|
||||
return call;
|
||||
}
|
||||
|
||||
void async_hcall(unsigned long call,
|
||||
unsigned long arg1, unsigned long arg2, unsigned long arg3);
|
||||
|
||||
/* Can't use our min() macro here: needs to be a constant */
|
||||
#define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
|
||||
|
||||
#define LHCALL_RING_SIZE 64
|
||||
struct hcall_ring
|
||||
{
|
||||
u32 eax, edx, ebx, ecx;
|
||||
};
|
||||
|
||||
/* All the good stuff happens here: guest registers it with LGUEST_INIT */
|
||||
struct lguest_data
|
||||
{
|
||||
/* Fields which change during running: */
|
||||
/* 512 == enabled (same as eflags) */
|
||||
unsigned int irq_enabled;
|
||||
/* Interrupts blocked by guest. */
|
||||
DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
|
||||
|
||||
/* Virtual address of page fault. */
|
||||
unsigned long cr2;
|
||||
|
||||
/* Async hypercall ring. 0xFF == done, 0 == pending. */
|
||||
u8 hcall_status[LHCALL_RING_SIZE];
|
||||
struct hcall_ring hcalls[LHCALL_RING_SIZE];
|
||||
|
||||
/* Fields initialized by the hypervisor at boot: */
|
||||
/* Memory not to try to access */
|
||||
unsigned long reserve_mem;
|
||||
/* ID of this guest (used by network driver to set ethernet address) */
|
||||
u16 guestid;
|
||||
|
||||
/* Fields initialized by the guest at boot: */
|
||||
/* Instruction range to suppress interrupts even if enabled */
|
||||
unsigned long noirq_start, noirq_end;
|
||||
};
|
||||
extern struct lguest_data lguest_data;
|
||||
#endif /* __ASSEMBLY__ */
|
||||
#endif /* _ASM_LGUEST_H */
|
||||
|
|
@ -0,0 +1,48 @@
|
|||
#ifndef _ASM_LGUEST_DEVICE_H
|
||||
#define _ASM_LGUEST_DEVICE_H
|
||||
/* Everything you need to know about lguest devices. */
|
||||
#include <linux/device.h>
|
||||
#include <linux/lguest.h>
|
||||
#include <linux/lguest_launcher.h>
|
||||
|
||||
struct lguest_device {
|
||||
/* Unique busid, and index into lguest_page->devices[] */
|
||||
unsigned int index;
|
||||
|
||||
struct device dev;
|
||||
|
||||
/* Driver can hang data off here. */
|
||||
void *private;
|
||||
};
|
||||
|
||||
/* By convention, each device can use irq index+1 if it wants to. */
|
||||
static inline int lgdev_irq(const struct lguest_device *dev)
|
||||
{
|
||||
return dev->index + 1;
|
||||
}
|
||||
|
||||
/* dma args must not be vmalloced! */
|
||||
void lguest_send_dma(unsigned long key, struct lguest_dma *dma);
|
||||
int lguest_bind_dma(unsigned long key, struct lguest_dma *dmas,
|
||||
unsigned int num, u8 irq);
|
||||
void lguest_unbind_dma(unsigned long key, struct lguest_dma *dmas);
|
||||
|
||||
/* Map the virtual device space */
|
||||
void *lguest_map(unsigned long phys_addr, unsigned long pages);
|
||||
void lguest_unmap(void *);
|
||||
|
||||
struct lguest_driver {
|
||||
const char *name;
|
||||
struct module *owner;
|
||||
u16 device_type;
|
||||
int (*probe)(struct lguest_device *dev);
|
||||
void (*remove)(struct lguest_device *dev);
|
||||
|
||||
struct device_driver drv;
|
||||
};
|
||||
|
||||
extern int register_lguest_driver(struct lguest_driver *drv);
|
||||
extern void unregister_lguest_driver(struct lguest_driver *drv);
|
||||
|
||||
extern struct lguest_device_desc *lguest_devices; /* Just past max_pfn */
|
||||
#endif /* _ASM_LGUEST_DEVICE_H */
|
||||
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Reference in New Issue