diff --git a/sys/dev/hyperv/vmbus/aarch64/hyperv_aarch64.c b/sys/dev/hyperv/vmbus/aarch64/hyperv_aarch64.c index eb915131fb6f..47390ad35c0f 100644 --- a/sys/dev/hyperv/vmbus/aarch64/hyperv_aarch64.c +++ b/sys/dev/hyperv/vmbus/aarch64/hyperv_aarch64.c @@ -1,96 +1,136 @@ /*- SPDX-License-Identifier: BSD-2-Clause-FreeBSD * Copyright (c) 2009-2012,2016-2017, 2022 Microsoft Corp. * Copyright (c) 2012 NetApp Inc. * Copyright (c) 2012 Citrix Inc. * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * 1. Redistributions of source code must retain the above copyright * notice unmodified, this list of conditions, and the following * disclaimer. * 2. Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** * Implements low-level interactions with Hyper-V/Azure */ #include __FBSDID("$FreeBSD$"); #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include +#include void hyperv_init_tc(void); int hypercall_page_setup(vm_paddr_t); void hypercall_disable(void); bool hyperv_identify_features(void); +static bool is_hyperv(void); + u_int hyperv_ver_major; u_int hyperv_features; u_int hyperv_recommends; hyperv_tc64_t hyperv_tc64; void hyperv_init_tc(void) { hyperv_tc64 = NULL; } int hypercall_page_setup(vm_paddr_t hc) { return (0); } void hypercall_disable(void) { return; } +/* + * This function verifies if the platform is Hyper-V or not. + * To do that we are using ACPI FADT and for that, acpi + * fadt is mapped first. + */ +static bool +is_hyperv(void) +{ + ACPI_TABLE_FADT *fadt; + vm_paddr_t physaddr; + uint64_t hypervid; + bool ret; + + physaddr = acpi_find_table(ACPI_SIG_FADT); + if (physaddr == 0) + return (false); + + fadt = acpi_map_table(physaddr, ACPI_SIG_FADT); + if (fadt == NULL) { + printf("hyperv: Unable to map the FADT\n"); + return (false); + } + + hypervid = fadt->HypervisorId; + acpi_unmap_table(fadt); + ret = strncmp((char *)&hypervid, "MsHyperV", 8) == 0 ? true : false; + return (ret); +} + bool hyperv_identify_features(void) { struct hv_get_vp_registers_output result; - vm_guest = VM_GUEST_HV; + if (resource_disabled("acpi", 0)) + return (false); + if (!is_hyperv()) + return (false); + + vm_guest = VM_GUEST_HV; + /* use MSRs to get the hyperv specific + * attributes. + */ hv_get_vpreg_128(CPUID_LEAF_HV_FEATURES, &result); hyperv_features = result.as32.a; hv_get_vpreg_128(CPUID_LEAF_HV_IDENTITY, &result); hyperv_ver_major = result.as32.b >> 16; hv_get_vpreg_128(CPUID_LEAF_HV_RECOMMENDS, &result); hyperv_recommends = result.as32.a; return (true); }