2117a66af5
This was a source of indirection needed to support PVHv1. Now that that support has been removed, we can eliminate it. Reviewed by: royger
492 lines
12 KiB
C
492 lines
12 KiB
C
/*-
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* SPDX-License-Identifier: BSD-2-Clause-FreeBSD
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*
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* Copyright (c) 2008, 2013 Citrix Systems, Inc.
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* Copyright (c) 2012 Spectra Logic Corporation
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/cdefs.h>
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__FBSDID("$FreeBSD$");
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/smp.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <vm/vm_param.h>
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#include <dev/pci/pcivar.h>
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#include <machine/cpufunc.h>
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#include <machine/cpu.h>
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#include <machine/smp.h>
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#include <x86/apicreg.h>
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#include <xen/xen-os.h>
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#include <xen/error.h>
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#include <xen/features.h>
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#include <xen/gnttab.h>
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#include <xen/hypervisor.h>
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#include <xen/hvm.h>
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#include <xen/xen_intr.h>
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#include <xen/interface/arch-x86/cpuid.h>
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#include <xen/interface/hvm/params.h>
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#include <xen/interface/vcpu.h>
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/*--------------------------- Forward Declarations ---------------------------*/
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static void xen_hvm_cpu_init(void);
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/*-------------------------------- Global Data -------------------------------*/
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enum xen_domain_type xen_domain_type = XEN_NATIVE;
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#ifdef SMP
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struct cpu_ops xen_hvm_cpu_ops = {
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.cpu_init = xen_hvm_cpu_init,
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.cpu_resume = xen_hvm_cpu_init
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};
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#endif
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static MALLOC_DEFINE(M_XENHVM, "xen_hvm", "Xen HVM PV Support");
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/**
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* If non-zero, the hypervisor has been configured to use a direct
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* IDT event callback for interrupt injection.
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*/
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int xen_vector_callback_enabled;
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/**
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* Start info flags. ATM this only used to store the initial domain flag for
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* PVHv2, and it's always empty for HVM guests.
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*/
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uint32_t hvm_start_flags;
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/**
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* Signal whether the vector injected for the event channel upcall requires to
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* be EOI'ed on the local APIC.
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*/
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bool xen_evtchn_needs_ack;
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/*------------------------------- Per-CPU Data -------------------------------*/
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DPCPU_DEFINE(struct vcpu_info, vcpu_local_info);
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DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
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/*------------------ Hypervisor Access Shared Memory Regions -----------------*/
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shared_info_t *HYPERVISOR_shared_info;
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/*------------------------------ Sysctl tunables -----------------------------*/
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int xen_disable_pv_disks = 0;
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int xen_disable_pv_nics = 0;
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TUNABLE_INT("hw.xen.disable_pv_disks", &xen_disable_pv_disks);
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TUNABLE_INT("hw.xen.disable_pv_nics", &xen_disable_pv_nics);
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/*---------------------- XEN Hypervisor Probe and Setup ----------------------*/
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static uint32_t cpuid_base;
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static uint32_t
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xen_hvm_cpuid_base(void)
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{
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uint32_t base, regs[4];
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for (base = 0x40000000; base < 0x40010000; base += 0x100) {
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do_cpuid(base, regs);
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if (!memcmp("XenVMMXenVMM", ®s[1], 12)
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&& (regs[0] - base) >= 2)
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return (base);
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}
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return (0);
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}
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static void
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hypervisor_quirks(unsigned int major, unsigned int minor)
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{
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#ifdef SMP
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if (((major < 4) || (major == 4 && minor <= 5)) &&
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msix_disable_migration == -1) {
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/*
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* Xen hypervisors prior to 4.6.0 do not properly
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* handle updates to enabled MSI-X table entries,
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* so disable MSI-X interrupt migration in that
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* case.
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*/
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if (bootverbose)
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printf(
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"Disabling MSI-X interrupt migration due to Xen hypervisor bug.\n"
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"Set machdep.msix_disable_migration=0 to forcefully enable it.\n");
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msix_disable_migration = 1;
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}
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#endif
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}
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static void
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hypervisor_version(void)
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{
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uint32_t regs[4];
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int major, minor;
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do_cpuid(cpuid_base + 1, regs);
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major = regs[0] >> 16;
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minor = regs[0] & 0xffff;
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printf("XEN: Hypervisor version %d.%d detected.\n", major, minor);
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hypervisor_quirks(major, minor);
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}
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/*
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* Allocate and fill in the hypcall page.
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*/
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int
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xen_hvm_init_hypercall_stubs(enum xen_hvm_init_type init_type)
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{
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uint32_t regs[4];
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/* Legacy PVH will get here without the cpuid leaf being set. */
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if (cpuid_base == 0)
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cpuid_base = xen_hvm_cpuid_base();
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if (cpuid_base == 0)
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return (ENXIO);
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if (xen_domain() && init_type == XEN_HVM_INIT_LATE) {
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/*
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* If the domain type is already set we can assume that the
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* hypercall page has been populated too, so just print the
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* version (and apply any quirks) and exit.
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*/
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hypervisor_version();
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return 0;
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}
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if (init_type == XEN_HVM_INIT_LATE)
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hypervisor_version();
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/*
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* Find the hypercall pages.
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*/
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do_cpuid(cpuid_base + 2, regs);
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if (regs[0] != 1)
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return (EINVAL);
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wrmsr(regs[1], (init_type == XEN_HVM_INIT_EARLY)
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? ((vm_paddr_t)&hypercall_page - KERNBASE)
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: vtophys(&hypercall_page));
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return (0);
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}
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static void
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xen_hvm_init_shared_info_page(void)
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{
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struct xen_add_to_physmap xatp;
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if (xen_pv_domain()) {
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/*
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* Already setup in the PV case, shared_info is passed inside
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* of the start_info struct at start of day.
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*/
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return;
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}
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if (HYPERVISOR_shared_info == NULL) {
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HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT);
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if (HYPERVISOR_shared_info == NULL)
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panic("Unable to allocate Xen shared info page");
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}
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xatp.domid = DOMID_SELF;
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xatp.idx = 0;
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xatp.space = XENMAPSPACE_shared_info;
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xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT;
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if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
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panic("HYPERVISOR_memory_op failed");
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}
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static int
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set_percpu_callback(unsigned int vcpu)
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{
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struct xen_hvm_evtchn_upcall_vector vec;
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int error;
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vec.vcpu = vcpu;
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vec.vector = IDT_EVTCHN;
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error = HYPERVISOR_hvm_op(HVMOP_set_evtchn_upcall_vector, &vec);
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return (error != 0 ? xen_translate_error(error) : 0);
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}
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/*
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* Tell the hypervisor how to contact us for event channel callbacks.
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*/
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void
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xen_hvm_set_callback(device_t dev)
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{
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struct xen_hvm_param xhp;
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int irq;
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if (xen_vector_callback_enabled)
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return;
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xhp.domid = DOMID_SELF;
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xhp.index = HVM_PARAM_CALLBACK_IRQ;
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if (xen_feature(XENFEAT_hvm_callback_vector) != 0) {
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int error;
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error = set_percpu_callback(0);
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if (error == 0) {
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xen_evtchn_needs_ack = true;
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/* Trick toolstack to think we are enlightened */
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xhp.value = 1;
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} else
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xhp.value = HVM_CALLBACK_VECTOR(IDT_EVTCHN);
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error = HYPERVISOR_hvm_op(HVMOP_set_param, &xhp);
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if (error == 0) {
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xen_vector_callback_enabled = 1;
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return;
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} else if (xen_evtchn_needs_ack)
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panic("Unable to setup fake HVM param: %d", error);
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printf("Xen HVM callback vector registration failed (%d). "
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"Falling back to emulated device interrupt\n", error);
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}
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xen_vector_callback_enabled = 0;
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if (dev == NULL) {
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/*
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* Called from early boot or resume.
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* xenpci will invoke us again later.
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*/
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return;
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}
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irq = pci_get_irq(dev);
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if (irq < 16) {
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xhp.value = HVM_CALLBACK_GSI(irq);
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} else {
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u_int slot;
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u_int pin;
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slot = pci_get_slot(dev);
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pin = pci_get_intpin(dev) - 1;
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xhp.value = HVM_CALLBACK_PCI_INTX(slot, pin);
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}
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if (HYPERVISOR_hvm_op(HVMOP_set_param, &xhp) != 0)
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panic("Can't set evtchn callback");
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}
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#define XEN_MAGIC_IOPORT 0x10
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enum {
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XMI_MAGIC = 0x49d2,
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XMI_UNPLUG_IDE_DISKS = 0x01,
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XMI_UNPLUG_NICS = 0x02,
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XMI_UNPLUG_IDE_EXCEPT_PRI_MASTER = 0x04
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};
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static void
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xen_hvm_disable_emulated_devices(void)
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{
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u_short disable_devs = 0;
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if (xen_pv_domain()) {
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/*
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* No emulated devices in the PV case, so no need to unplug
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* anything.
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*/
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if (xen_disable_pv_disks != 0 || xen_disable_pv_nics != 0)
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printf("PV devices cannot be disabled in PV guests\n");
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return;
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}
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if (inw(XEN_MAGIC_IOPORT) != XMI_MAGIC)
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return;
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if (xen_disable_pv_disks == 0) {
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if (bootverbose)
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printf("XEN: disabling emulated disks\n");
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disable_devs |= XMI_UNPLUG_IDE_DISKS;
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}
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if (xen_disable_pv_nics == 0) {
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if (bootverbose)
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printf("XEN: disabling emulated nics\n");
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disable_devs |= XMI_UNPLUG_NICS;
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}
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if (disable_devs != 0)
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outw(XEN_MAGIC_IOPORT, disable_devs);
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}
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static void
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xen_hvm_init(enum xen_hvm_init_type init_type)
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{
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int error;
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int i;
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if (init_type == XEN_HVM_INIT_CANCELLED_SUSPEND)
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return;
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error = xen_hvm_init_hypercall_stubs(init_type);
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switch (init_type) {
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case XEN_HVM_INIT_LATE:
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if (error != 0)
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return;
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/*
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* If xen_domain_type is not set at this point
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* it means we are inside a (PV)HVM guest, because
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* for PVH the guest type is set much earlier
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* (see hammer_time_xen).
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*/
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if (!xen_domain()) {
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xen_domain_type = XEN_HVM_DOMAIN;
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vm_guest = VM_GUEST_XEN;
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}
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setup_xen_features();
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#ifdef SMP
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cpu_ops = xen_hvm_cpu_ops;
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#endif
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break;
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case XEN_HVM_INIT_RESUME:
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if (error != 0)
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panic("Unable to init Xen hypercall stubs on resume");
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/* Clear stale vcpu_info. */
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CPU_FOREACH(i)
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DPCPU_ID_SET(i, vcpu_info, NULL);
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break;
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default:
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panic("Unsupported HVM initialization type");
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}
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xen_vector_callback_enabled = 0;
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xen_evtchn_needs_ack = false;
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xen_hvm_set_callback(NULL);
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/*
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* On (PV)HVM domains we need to request the hypervisor to
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* fill the shared info page, for PVH guest the shared_info page
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* is passed inside the start_info struct and is already set, so this
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* functions are no-ops.
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*/
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xen_hvm_init_shared_info_page();
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xen_hvm_disable_emulated_devices();
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}
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void
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xen_hvm_suspend(void)
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{
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}
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void
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xen_hvm_resume(bool suspend_cancelled)
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{
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xen_hvm_init(suspend_cancelled ?
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XEN_HVM_INIT_CANCELLED_SUSPEND : XEN_HVM_INIT_RESUME);
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/* Register vcpu_info area for CPU#0. */
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xen_hvm_cpu_init();
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}
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static void
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xen_hvm_sysinit(void *arg __unused)
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{
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xen_hvm_init(XEN_HVM_INIT_LATE);
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}
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SYSINIT(xen_hvm_init, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, xen_hvm_sysinit, NULL);
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static void
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xen_hvm_cpu_init(void)
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{
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struct vcpu_register_vcpu_info info;
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struct vcpu_info *vcpu_info;
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uint32_t regs[4];
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int cpu, rc;
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if (!xen_domain())
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return;
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if (DPCPU_GET(vcpu_info) != NULL) {
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/*
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* vcpu_info is already set. We're resuming
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* from a failed migration and our pre-suspend
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* configuration is still valid.
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*/
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return;
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}
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/*
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* Set vCPU ID. If available fetch the ID from CPUID, if not just use
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* the ACPI ID.
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*/
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KASSERT(cpuid_base != 0, ("Invalid base Xen CPUID leaf"));
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cpuid_count(cpuid_base + 4, 0, regs);
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KASSERT((regs[0] & XEN_HVM_CPUID_VCPU_ID_PRESENT) ||
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!xen_pv_domain(),
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("Xen PV domain without vcpu_id in cpuid"));
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PCPU_SET(vcpu_id, (regs[0] & XEN_HVM_CPUID_VCPU_ID_PRESENT) ?
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regs[1] : PCPU_GET(acpi_id));
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if (xen_evtchn_needs_ack && !IS_BSP()) {
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/*
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* Setup the per-vpcu event channel upcall vector. This is only
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* required when using the new HVMOP_set_evtchn_upcall_vector
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* hypercall, which allows using a different vector for each
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* vCPU. Note that FreeBSD uses the same vector for all vCPUs
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* because it's not dynamically allocated.
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*/
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rc = set_percpu_callback(PCPU_GET(vcpu_id));
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if (rc != 0)
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panic("Event channel upcall vector setup failed: %d",
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rc);
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}
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/*
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* Set the vCPU info.
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*
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* NB: the vCPU info for vCPUs < 32 can be fetched from the shared info
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* page, but in order to make sure the mapping code is correct always
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* attempt to map the vCPU info at a custom place.
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*/
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vcpu_info = DPCPU_PTR(vcpu_local_info);
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cpu = PCPU_GET(vcpu_id);
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info.mfn = vtophys(vcpu_info) >> PAGE_SHIFT;
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info.offset = vtophys(vcpu_info) - trunc_page(vtophys(vcpu_info));
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rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
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if (rc != 0)
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DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]);
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else
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DPCPU_SET(vcpu_info, vcpu_info);
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}
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SYSINIT(xen_hvm_cpu_init, SI_SUB_INTR, SI_ORDER_FIRST, xen_hvm_cpu_init, NULL);
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