1 // SPDX-License-Identifier: GPL-2.0-only
50 		return reg - HV_X64_MSR_SINT0 + HV_X64_MSR_NESTED_SINT0;  in hv_get_nested_msr()
143  * Routines to do per-architecture handling of stimer0
232  * Hyper-V clock counter resets during hibernation. Save and restore clock
234  * before suspend. This is to make sure that sched_clock using hv tsc page
246 	 * Adjust the offsets used by hv tsc clocksource to  in restore_hv_clock_tsc_state()
249 	 *                - reference counter (time) now.  in restore_hv_clock_tsc_state()
251 	hv_adj_sched_clock_offset(hv_ref_counter_at_suspend - hv_read_reference_counter());  in restore_hv_clock_tsc_state()
256  * functions of x86_platform. The Hyper-V clock counter is reset during
257  * suspend-resume and the offset used to measure time needs to be
297 	    memcmp("Microsoft Hv", hyp_signature, 12))  in ms_hyperv_platform()
316  * Prior to WS2016 Debug-VM sends NMIs to all CPUs which makes
322 	static atomic_t nmi_cpu = ATOMIC_INIT(-1);  in hv_nmi_unknown()
328 	old_cpu = -1;  in hv_nmi_unknown()
365 	 *  Override wakeup_secondary_cpu_64 callback for SEV-SNP  in hv_smp_prepare_cpus()
369 		apic->wakeup_secondary_cpu_64 = hv_snp_boot_ap;  in hv_smp_prepare_cpus()
392  * When a fully enlightened TDX VM runs on Hyper-V, the firmware sets the
394  * interrupts can't work because request_irq() -> ... -> irq_to_desc() returns
397  * later setup_IO_APIC_irqs() -> find_irq_entry() fails to find the legacy irqs
402  * 'default_legacy_pic'. This way, mp_config_acpi_legacy_irqs() sees a non-zero
417 		pr_err("%s: Could not detect Hyper-V version\n", __func__);  in hv_get_hypervisor_version()
418 		return -ENODEV;  in hv_get_hypervisor_version()
421 	cpuid(HYPERV_CPUID_VERSION, &info->eax, &info->ebx, &info->ecx, &info->edx);  in hv_get_hypervisor_version()
431 	pv_info.name = "Hyper-V";  in ms_hyperv_init_platform()
444 	pr_info("Hyper-V: privilege flags low 0x%x, high 0x%x, hints 0x%x, misc 0x%x\n",  in ms_hyperv_init_platform()
451 	pr_debug("Hyper-V: max %u virtual processors, %u logical processors\n",  in ms_hyperv_init_platform()
463 	 * Hyper-V should never specify running as root and as a Confidential  in ms_hyperv_init_platform()
464 	 * VM. But to protect against a compromised/malicious Hyper-V trying  in ms_hyperv_init_platform()
471 		pr_info("Hyper-V: running as root partition\n");  in ms_hyperv_init_platform()
476 		pr_info("Hyper-V: running on a nested hypervisor\n");  in ms_hyperv_init_platform()
496 		pr_info("Hyper-V: Isolation Config: Group A 0x%x, Group B 0x%x\n",  in ms_hyperv_init_platform()
510 				 * Mark the Hyper-V TSC page feature as disabled  in ms_hyperv_init_platform()
520 				 * print a warning message. The slower Hyper-V MSR-based  in ms_hyperv_init_platform()
524 					pr_warn("Hyper-V: Invariant TSC is unavailable\n");  in ms_hyperv_init_platform()
529 				/* Don't trust Hyper-V's TLB-flushing hypercalls. */  in ms_hyperv_init_platform()
540 		pr_info("Hyper-V: Nested features: 0x%x\n",  in ms_hyperv_init_platform()
555 		pr_info("Hyper-V: LAPIC Timer Frequency: %#x\n",  in ms_hyperv_init_platform()
627 	 * Hyper-V doesn't provide irq remapping for IO-APIC. To enable x2apic,  in ms_hyperv_init_platform()
629 	 * and Hyper-V IOMMU driver makes sure cpus assigned with IO-APIC irqs  in ms_hyperv_init_platform()
630 	 * have 8-bit APIC id.  in ms_hyperv_init_platform()
637 	/* Register Hyper-V specific clocksource */  in ms_hyperv_init_platform()
643 	 * TSC should be marked as unstable only after Hyper-V  in ms_hyperv_init_platform()
648 		mark_tsc_unstable("running on Hyper-V");  in ms_hyperv_init_platform()
660  * returns -ENODEV and the Hyper-V IOMMU driver is not used; instead, the
661  * generic support of the 15-bit APIC ID is used: see __irq_msi_compose_msg().
663  * Note: for a VM on Hyper-V, the I/O-APIC is the only device which
665  * There is no HPET, and PCI MSI/MSI-X interrupts are remapped by the
666  * pci-hyperv host bridge.
668  * Note: for a Hyper-V root partition, this will always return false.
670  * default, they are implemented as intercepts by the Windows Hyper-V stack.
690 	ghcb_set_rcx(ghcb, regs->cx);  in hv_sev_es_hcall_prepare()
691 	ghcb_set_rdx(ghcb, regs->dx);  in hv_sev_es_hcall_prepare()
692 	ghcb_set_r8(ghcb, regs->r8);  in hv_sev_es_hcall_prepare()
703 	.name			= "Microsoft Hyper-V",