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cd95ea81f2
Now that Linux never sets CR0.TS, lguest doesn't need to support it. Signed-off-by: Andy Lutomirski <luto@kernel.org> Cc: Borislav Petkov <bp@alien8.de> Cc: Brian Gerst <brgerst@gmail.com> Cc: Dave Hansen <dave.hansen@linux.intel.com> Cc: Denys Vlasenko <dvlasenk@redhat.com> Cc: Fenghua Yu <fenghua.yu@intel.com> Cc: H. Peter Anvin <hpa@zytor.com> Cc: Josh Poimboeuf <jpoimboe@redhat.com> Cc: Linus Torvalds <torvalds@linux-foundation.org> Cc: Oleg Nesterov <oleg@redhat.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: Peter Zijlstra <peterz@infradead.org> Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com> Cc: Rik van Riel <riel@redhat.com> Cc: Rusty Russell <rusty@rustcorp.com.au> Cc: Thomas Gleixner <tglx@linutronix.de> Cc: kvm list <kvm@vger.kernel.org> Link: http://lkml.kernel.org/r/8a7bf2c11231c082258fd67705d0f275639b8475.1477951965.git.luto@kernel.org Signed-off-by: Ingo Molnar <mingo@kernel.org>
75 lines
2.5 KiB
C
75 lines
2.5 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_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_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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/*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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* Our hypercall mechanism uses the highest unused trap code (traps 32 and
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* above are used by real hardware interrupts). Seventeen hypercalls are
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* available: the hypercall number is put in the %eax register, and the
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* arguments (when required) are placed in %ebx, %ecx, %edx and %esi.
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* 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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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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unsigned long arg4)
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{
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/* "int" is the Intel instruction to trigger a trap. */
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asm volatile("int $" __stringify(LGUEST_TRAP_ENTRY)
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/* The call in %eax (aka "a") might be overwritten */
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: "=a"(call)
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/* The arguments are in %eax, %ebx, %ecx, %edx & %esi */
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: "a"(call), "b"(arg1), "c"(arg2), "d"(arg3), "S"(arg4)
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/* "memory" means this might write somewhere in memory.
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* This isn't true for all calls, but it's safe to tell
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* gcc that it might happen so it doesn't get clever. */
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: "memory");
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return call;
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}
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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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