d9b8ca8474
This patch is similiar to Gleb Natapov's patch for KVM, which enable the hypervisor to emulate x2apic feature for the guest. By this way, the emulation of lapic would be simpler with x2apic interface(MSR), and faster. [v2: Re-organized 'xen_hvm_need_lapic' per Ian Campbell suggestion] Acked-by: Jeremy Fitzhardinge <jeremy.fitzhardinge@citrix.com> Signed-off-by: Sheng Yang <sheng@linux.intel.com> Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
76 lines
2.4 KiB
C
76 lines
2.4 KiB
C
/******************************************************************************
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* hypervisor.h
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*
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* Linux-specific hypervisor handling.
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*
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* Copyright (c) 2002-2004, K A Fraser
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*
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* This program is free software; you can redistribute it and/or
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* modify it under the terms of the GNU General Public License version 2
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* as published by the Free Software Foundation; or, when distributed
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* separately from the Linux kernel or incorporated into other
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* software packages, subject to the following license:
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy
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* of this source file (the "Software"), to deal in the Software without
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* restriction, including without limitation the rights to use, copy, modify,
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* merge, publish, distribute, sublicense, and/or sell copies of the Software,
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* and to permit persons to whom the Software is furnished to do so, subject to
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* the following conditions:
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*
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* The above copyright notice and this permission notice shall be included in
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* all copies or substantial portions of the Software.
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*
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* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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* IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
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* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
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* IN THE SOFTWARE.
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*/
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#ifndef _ASM_X86_XEN_HYPERVISOR_H
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#define _ASM_X86_XEN_HYPERVISOR_H
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/* arch/i386/kernel/setup.c */
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extern struct shared_info *HYPERVISOR_shared_info;
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extern struct start_info *xen_start_info;
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#include <asm/processor.h>
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static inline uint32_t xen_cpuid_base(void)
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{
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uint32_t base, eax, ebx, ecx, edx;
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char signature[13];
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for (base = 0x40000000; base < 0x40010000; base += 0x100) {
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cpuid(base, &eax, &ebx, &ecx, &edx);
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*(uint32_t *)(signature + 0) = ebx;
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*(uint32_t *)(signature + 4) = ecx;
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*(uint32_t *)(signature + 8) = edx;
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signature[12] = 0;
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if (!strcmp("XenVMMXenVMM", signature) && ((eax - base) >= 2))
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return base;
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}
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return 0;
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}
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#ifdef CONFIG_XEN
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extern bool xen_hvm_need_lapic(void);
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static inline bool xen_x2apic_para_available(void)
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{
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return xen_hvm_need_lapic();
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}
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#else
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static inline bool xen_x2apic_para_available(void)
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{
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return (xen_cpuid_base() != 0);
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}
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#endif
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#endif /* _ASM_X86_XEN_HYPERVISOR_H */
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