arch/x86/include/asm/xen/cpuid.h

   1 /******************************************************************************
   2  * arch-x86/cpuid.h
   3  *
   4  * CPUID interface to Xen.
   5  *
   6  * Permission is hereby granted, free of charge, to any person obtaining a copy
   7  * of this software and associated documentation files (the "Software"), to
   8  * deal in the Software without restriction, including without limitation the
   9  * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or
  10  * sell copies of the Software, and to permit persons to whom the Software is
  11  * furnished to do so, subject to the following conditions:
  12  *
  13  * The above copyright notice and this permission notice shall be included in
  14  * all copies or substantial portions of the Software.
  15  *
  16  * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
  17  * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
  18  * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
  19  * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
  20  * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
  21  * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER
  22  * DEALINGS IN THE SOFTWARE.
  23  *
  24  * Copyright (c) 2007 Citrix Systems, Inc.
  25  *
  26  * Authors:
  27  *    Keir Fraser <keir@xen.org>
  28  */
  29
  30 #ifndef __XEN_PUBLIC_ARCH_X86_CPUID_H__
  31 #define __XEN_PUBLIC_ARCH_X86_CPUID_H__
  32
  33 /*
  34  * For compatibility with other hypervisor interfaces, the Xen cpuid leaves
  35  * can be found at the first otherwise unused 0x100 aligned boundary starting
  36  * from 0x40000000.
  37  *
  38  * e.g If viridian extensions are enabled for an HVM domain, the Xen cpuid
  39  * leaves will start at 0x40000100
  40  */
  41
  42 #define XEN_CPUID_FIRST_LEAF 0x40000000
  43 #define XEN_CPUID_LEAF(i)    (XEN_CPUID_FIRST_LEAF + (i))
  44
  45 /*
  46  * Leaf 1 (0x40000x00)
  47  * EAX: Largest Xen-information leaf. All leaves up to an including @EAX
  48  *      are supported by the Xen host.
  49  * EBX-EDX: "XenVMMXenVMM" signature, allowing positive identification
  50  *      of a Xen host.
  51  */
  52 #define XEN_CPUID_SIGNATURE_EBX 0x566e6558 /* "XenV" */
  53 #define XEN_CPUID_SIGNATURE_ECX 0x65584d4d /* "MMXe" */
  54 #define XEN_CPUID_SIGNATURE_EDX 0x4d4d566e /* "nVMM" */
  55
  56 /*
  57  * Leaf 2 (0x40000x01)
  58  * EAX[31:16]: Xen major version.
  59  * EAX[15: 0]: Xen minor version.
  60  * EBX-EDX: Reserved (currently all zeroes).
  61  */
  62
  63 /*
  64  * Leaf 3 (0x40000x02)
  65  * EAX: Number of hypercall transfer pages. This register is always guaranteed
  66  *      to specify one hypercall page.
  67  * EBX: Base address of Xen-specific MSRs.
  68  * ECX: Features 1. Unused bits are set to zero.
  69  * EDX: Features 2. Unused bits are set to zero.
  70  */
  71
  72 /* Does the host support MMU_PT_UPDATE_PRESERVE_AD for this guest? */
  73 #define _XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD 0
  74 #define XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD  (1u<<0)
  75
  76 /*
  77  * Leaf 4 (0x40000x03)
  78  * Sub-leaf 0: EAX: bit 0: emulated tsc
  79  *                  bit 1: host tsc is known to be reliable
  80  *                  bit 2: RDTSCP instruction available
  81  *             EBX: tsc_mode: 0=default (emulate if necessary), 1=emulate,
  82  *                            2=no emulation, 3=no emulation + TSC_AUX support
  83  *             ECX: guest tsc frequency in kHz
  84  *             EDX: guest tsc incarnation (migration count)
  85  * Sub-leaf 1: EAX: tsc offset low part
  86  *             EBX: tsc offset high part
  87  *             ECX: multiplicator for tsc->ns conversion
  88  *             EDX: shift amount for tsc->ns conversion
  89  * Sub-leaf 2: EAX: host tsc frequency in kHz
  90  */
  91
  92 /*
  93  * Leaf 5 (0x40000x04)
  94  * HVM-specific features
  95  * Sub-leaf 0: EAX: Features
  96  * Sub-leaf 0: EBX: vcpu id (iff EAX has XEN_HVM_CPUID_VCPU_ID_PRESENT flag)
  97  */
  98 #define XEN_HVM_CPUID_APIC_ACCESS_VIRT (1u << 0) /* Virtualized APIC registers */
  99 #define XEN_HVM_CPUID_X2APIC_VIRT      (1u << 1) /* Virtualized x2APIC accesses */
 100 /* Memory mapped from other domains has valid IOMMU entries */
 101 #define XEN_HVM_CPUID_IOMMU_MAPPINGS   (1u << 2)
 102 #define XEN_HVM_CPUID_VCPU_ID_PRESENT  (1u << 3) /* vcpu id is present in EBX */
 103
 104 /*
 105  * Leaf 6 (0x40000x05)
 106  * PV-specific parameters
 107  * Sub-leaf 0: EAX: max available sub-leaf
 108  * Sub-leaf 0: EBX: bits 0-7: max machine address width
 109  */
 110
 111 /* Max. address width in bits taking memory hotplug into account. */
 112 #define XEN_CPUID_MACHINE_ADDRESS_WIDTH_MASK (0xffu << 0)
 113
 114 #define XEN_CPUID_MAX_NUM_LEAVES 5
 115
 116 #endif /* __XEN_PUBLIC_ARCH_X86_CPUID_H__ */