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__ */