07ad157f6e
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>
86 lines
2.4 KiB
C
86 lines
2.4 KiB
C
/* Things the lguest guest needs to know. Note: like all lguest interfaces,
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* this is subject to wild and random change between versions. */
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#ifndef _ASM_LGUEST_H
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#define _ASM_LGUEST_H
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/* These are randomly chosen numbers which indicate we're an lguest at boot */
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#define LGUEST_MAGIC_EBP 0x4C687970
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#define LGUEST_MAGIC_EDI 0x652D4D65
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#define LGUEST_MAGIC_ESI 0xFFFFFFFF
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#ifndef __ASSEMBLY__
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#include <asm/irq.h>
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#define LHCALL_FLUSH_ASYNC 0
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#define LHCALL_LGUEST_INIT 1
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#define LHCALL_CRASH 2
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#define LHCALL_LOAD_GDT 3
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#define LHCALL_NEW_PGTABLE 4
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#define LHCALL_FLUSH_TLB 5
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#define LHCALL_LOAD_IDT_ENTRY 6
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#define LHCALL_SET_STACK 7
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#define LHCALL_TS 8
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#define LHCALL_TIMER_READ 9
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#define LHCALL_HALT 10
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#define LHCALL_GET_WALLCLOCK 11
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#define LHCALL_BIND_DMA 12
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#define LHCALL_SEND_DMA 13
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#define LHCALL_SET_PTE 14
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#define LHCALL_SET_PMD 15
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#define LHCALL_LOAD_TLS 16
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#define LGUEST_TRAP_ENTRY 0x1F
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static inline unsigned long
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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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asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
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: "=a"(call)
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: "a"(call), "d"(arg1), "b"(arg2), "c"(arg3)
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: "memory");
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return call;
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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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/* Can't use our min() macro here: needs to be a constant */
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#define LGUEST_IRQS (NR_IRQS < 32 ? NR_IRQS: 32)
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#define LHCALL_RING_SIZE 64
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struct hcall_ring
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{
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u32 eax, edx, ebx, ecx;
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};
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/* All the good stuff happens here: guest registers it with LGUEST_INIT */
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struct lguest_data
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{
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/* Fields which change during running: */
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/* 512 == enabled (same as eflags) */
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unsigned int irq_enabled;
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/* Interrupts blocked by guest. */
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DECLARE_BITMAP(blocked_interrupts, LGUEST_IRQS);
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/* Virtual address of page fault. */
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unsigned long cr2;
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/* Async hypercall ring. 0xFF == done, 0 == pending. */
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u8 hcall_status[LHCALL_RING_SIZE];
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struct hcall_ring hcalls[LHCALL_RING_SIZE];
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/* Fields initialized by the hypervisor at boot: */
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/* Memory not to try to access */
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unsigned long reserve_mem;
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/* ID of this guest (used by network driver to set ethernet address) */
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u16 guestid;
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/* Fields initialized by the guest at boot: */
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/* Instruction range to suppress interrupts even if enabled */
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unsigned long noirq_start, noirq_end;
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};
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extern struct lguest_data lguest_data;
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#endif /* __ASSEMBLY__ */
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#endif /* _ASM_LGUEST_H */
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