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git://git.kernel.org/pub/scm/linux/kernel/git/torvalds/linux.git
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67730e6c53
Use the kernel's canonical $(ARCH) paths instead of the raw target triple for KVM selftests directories. KVM selftests are quite nearly the only place in the entire kernel that using the target triple for directories, tools/testing/selftests/drivers/s390x being the lone holdout. Using the kernel's preferred nomenclature eliminates the minor, but annoying, friction of having to translate to KVM's selftests directories, e.g. for pattern matching, opening files, running selftests, etc. Opportunsitically delete file comments that reference the full path of the file, as they are obviously prone to becoming stale, and serve no known purpose. Reviewed-by: Muhammad Usama Anjum <usama.anjum@collabora.com> Acked-by: Claudio Imbrenda <imbrenda@linux.ibm.com> Acked-by: Andrew Jones <ajones@ventanamicro.com> Link: https://lore.kernel.org/r/20241128005547.4077116-16-seanjc@google.com Signed-off-by: Sean Christopherson <seanjc@google.com>
113 lines
3.1 KiB
C
113 lines
3.1 KiB
C
// SPDX-License-Identifier: GPL-2.0-only
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/*
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* Hyper-V specific functions.
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*
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* Copyright (C) 2021, Red Hat Inc.
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*/
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#include <stdint.h>
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#include "processor.h"
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#include "hyperv.h"
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const struct kvm_cpuid2 *kvm_get_supported_hv_cpuid(void)
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{
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static struct kvm_cpuid2 *cpuid;
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int kvm_fd;
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if (cpuid)
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return cpuid;
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cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
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kvm_fd = open_kvm_dev_path_or_exit();
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kvm_ioctl(kvm_fd, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
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close(kvm_fd);
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return cpuid;
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}
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void vcpu_set_hv_cpuid(struct kvm_vcpu *vcpu)
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{
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static struct kvm_cpuid2 *cpuid_full;
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const struct kvm_cpuid2 *cpuid_sys, *cpuid_hv;
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int i, nent = 0;
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if (!cpuid_full) {
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cpuid_sys = kvm_get_supported_cpuid();
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cpuid_hv = kvm_get_supported_hv_cpuid();
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cpuid_full = allocate_kvm_cpuid2(cpuid_sys->nent + cpuid_hv->nent);
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if (!cpuid_full) {
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perror("malloc");
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abort();
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}
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/* Need to skip KVM CPUID leaves 0x400000xx */
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for (i = 0; i < cpuid_sys->nent; i++) {
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if (cpuid_sys->entries[i].function >= 0x40000000 &&
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cpuid_sys->entries[i].function < 0x40000100)
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continue;
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cpuid_full->entries[nent] = cpuid_sys->entries[i];
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nent++;
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}
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memcpy(&cpuid_full->entries[nent], cpuid_hv->entries,
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cpuid_hv->nent * sizeof(struct kvm_cpuid_entry2));
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cpuid_full->nent = nent + cpuid_hv->nent;
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}
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vcpu_init_cpuid(vcpu, cpuid_full);
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}
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const struct kvm_cpuid2 *vcpu_get_supported_hv_cpuid(struct kvm_vcpu *vcpu)
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{
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struct kvm_cpuid2 *cpuid = allocate_kvm_cpuid2(MAX_NR_CPUID_ENTRIES);
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vcpu_ioctl(vcpu, KVM_GET_SUPPORTED_HV_CPUID, cpuid);
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return cpuid;
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}
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bool kvm_hv_cpu_has(struct kvm_x86_cpu_feature feature)
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{
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if (!kvm_has_cap(KVM_CAP_SYS_HYPERV_CPUID))
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return false;
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return kvm_cpuid_has(kvm_get_supported_hv_cpuid(), feature);
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}
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struct hyperv_test_pages *vcpu_alloc_hyperv_test_pages(struct kvm_vm *vm,
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vm_vaddr_t *p_hv_pages_gva)
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{
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vm_vaddr_t hv_pages_gva = vm_vaddr_alloc_page(vm);
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struct hyperv_test_pages *hv = addr_gva2hva(vm, hv_pages_gva);
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/* Setup of a region of guest memory for the VP Assist page. */
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hv->vp_assist = (void *)vm_vaddr_alloc_page(vm);
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hv->vp_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->vp_assist);
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hv->vp_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->vp_assist);
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/* Setup of a region of guest memory for the partition assist page. */
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hv->partition_assist = (void *)vm_vaddr_alloc_page(vm);
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hv->partition_assist_hva = addr_gva2hva(vm, (uintptr_t)hv->partition_assist);
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hv->partition_assist_gpa = addr_gva2gpa(vm, (uintptr_t)hv->partition_assist);
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/* Setup of a region of guest memory for the enlightened VMCS. */
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hv->enlightened_vmcs = (void *)vm_vaddr_alloc_page(vm);
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hv->enlightened_vmcs_hva = addr_gva2hva(vm, (uintptr_t)hv->enlightened_vmcs);
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hv->enlightened_vmcs_gpa = addr_gva2gpa(vm, (uintptr_t)hv->enlightened_vmcs);
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*p_hv_pages_gva = hv_pages_gva;
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return hv;
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}
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int enable_vp_assist(uint64_t vp_assist_pa, void *vp_assist)
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{
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uint64_t val = (vp_assist_pa & HV_X64_MSR_VP_ASSIST_PAGE_ADDRESS_MASK) |
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HV_X64_MSR_VP_ASSIST_PAGE_ENABLE;
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wrmsr(HV_X64_MSR_VP_ASSIST_PAGE, val);
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current_vp_assist = vp_assist;
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return 0;
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}
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