/****************************************************************************** * arch-x86/cpuid.h * * CPUID interface to Xen. * * Permission is hereby granted, free of charge, to any person obtaining a copy * of this software and associated documentation files (the "Software"), to * deal in the Software without restriction, including without limitation the * rights to use, copy, modify, merge, publish, distribute, sublicense, and/or * sell copies of the Software, and to permit persons to whom the Software is * furnished to do so, subject to the following conditions: * * The above copyright notice and this permission notice shall be included in * all copies or substantial portions of the Software. * * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING * FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER * DEALINGS IN THE SOFTWARE. * * Copyright (c) 2007 Citrix Systems, Inc. * * Authors: * Keir Fraser <keir@xen.org> */ #ifndef __XEN_PUBLIC_ARCH_X86_CPUID_H__ #define __XEN_PUBLIC_ARCH_X86_CPUID_H__ /* * For compatibility with other hypervisor interfaces, the Xen cpuid leaves * can be found at the first otherwise unused 0x100 aligned boundary starting * from 0x40000000. * * e.g If viridian extensions are enabled for an HVM domain, the Xen cpuid * leaves will start at 0x40000100 */ #define XEN_CPUID_FIRST_LEAF 0x40000000 #define XEN_CPUID_LEAF(i) (XEN_CPUID_FIRST_LEAF + (i)) /* * Leaf 1 (0x40000x00) * EAX: Largest Xen-information leaf. All leaves up to an including @EAX * are supported by the Xen host. * EBX-EDX: "XenVMMXenVMM" signature, allowing positive identification * of a Xen host. */ #define XEN_CPUID_SIGNATURE_EBX 0x566e6558 /* "XenV" */ #define XEN_CPUID_SIGNATURE_ECX 0x65584d4d /* "MMXe" */ #define XEN_CPUID_SIGNATURE_EDX 0x4d4d566e /* "nVMM" */ /* * Leaf 2 (0x40000x01) * EAX[31:16]: Xen major version. * EAX[15: 0]: Xen minor version. * EBX-EDX: Reserved (currently all zeroes). */ /* * Leaf 3 (0x40000x02) * EAX: Number of hypercall transfer pages. This register is always guaranteed * to specify one hypercall page. * EBX: Base address of Xen-specific MSRs. * ECX: Features 1. Unused bits are set to zero. * EDX: Features 2. Unused bits are set to zero. */ /* Does the host support MMU_PT_UPDATE_PRESERVE_AD for this guest? */ #define _XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD 0 #define XEN_CPUID_FEAT1_MMU_PT_UPDATE_PRESERVE_AD (1u<<0) /* * Leaf 5 (0x40000x04) * HVM-specific features */ /* EAX Features */ /* Virtualized APIC registers */ #define XEN_HVM_CPUID_APIC_ACCESS_VIRT (1u << 0) /* Virtualized x2APIC accesses */ #define XEN_HVM_CPUID_X2APIC_VIRT (1u << 1) /* Memory mapped from other domains has valid IOMMU entries */ #define XEN_HVM_CPUID_IOMMU_MAPPINGS (1u << 2) #define XEN_CPUID_MAX_NUM_LEAVES 4 #endif /* __XEN_PUBLIC_ARCH_X86_CPUID_H__ */