a91d74a3c4
Every so often, after code shuffles, I need to go through and unbitrot the Lguest Journey (see drivers/lguest/README). Since we now use RCU in a simple form in one place I took the opportunity to expand that explanation. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au> Cc: Ingo Molnar <mingo@redhat.com> Cc: Paul McKenney <paulmck@linux.vnet.ibm.com>
59 lines
1.9 KiB
C
59 lines
1.9 KiB
C
/* Architecture specific portion of the lguest hypercalls */
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#ifndef _ASM_X86_LGUEST_HCALL_H
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#define _ASM_X86_LGUEST_HCALL_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_SHUTDOWN 2
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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_SET_CLOCKEVENT 9
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#define LHCALL_HALT 10
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#define LHCALL_SET_PMD 13
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#define LHCALL_SET_PTE 14
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#define LHCALL_SET_PGD 15
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#define LHCALL_LOAD_TLS 16
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#define LHCALL_NOTIFY 17
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#define LHCALL_LOAD_GDT_ENTRY 18
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#define LHCALL_SEND_INTERRUPTS 19
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#define LGUEST_TRAP_ENTRY 0x1F
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/* Argument number 3 to LHCALL_LGUEST_SHUTDOWN */
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#define LGUEST_SHUTDOWN_POWEROFF 1
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#define LGUEST_SHUTDOWN_RESTART 2
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#ifndef __ASSEMBLY__
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#include <asm/hw_irq.h>
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#include <asm/kvm_para.h>
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/*G:030
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* But first, how does our Guest contact the Host to ask for privileged
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* operations? There are two ways: the direct way is to make a "hypercall",
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* to make requests of the Host Itself.
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*
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* We use the KVM hypercall mechanism, though completely different hypercall
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* numbers. Seventeen hypercalls are available: the hypercall number is put in
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* the %eax register, and the arguments (when required) are placed in %ebx,
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* %ecx, %edx and %esi. If a return value makes sense, it's returned in %eax.
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*
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* Grossly invalid calls result in Sudden Death at the hands of the vengeful
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* Host, rather than returning failure. This reflects Winston Churchill's
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* definition of a gentleman: "someone who is only rude intentionally".
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:*/
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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_args {
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/* These map directly onto eax/ebx/ecx/edx/esi in struct lguest_regs */
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unsigned long arg0, arg1, arg2, arg3, arg4;
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};
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#endif /* !__ASSEMBLY__ */
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#endif /* _ASM_X86_LGUEST_HCALL_H */
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