2 * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
4 * Copyright (c) 2008, 2013 Citrix Systems, Inc.
5 * Copyright (c) 2012 Spectra Logic Corporation
8 * Redistribution and use in source and binary forms, with or without
9 * modification, are permitted provided that the following conditions
11 * 1. Redistributions of source code must retain the above copyright
12 * notice, this list of conditions and the following disclaimer.
13 * 2. Redistributions in binary form must reproduce the above copyright
14 * notice, this list of conditions and the following disclaimer in the
15 * documentation and/or other materials provided with the distribution.
17 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS AS IS'' AND
18 * ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
19 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
20 * ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
21 * FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
22 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
23 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
24 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
25 * LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
26 * OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
30 #include <sys/cdefs.h>
31 __FBSDID("$FreeBSD$");
33 #include <sys/param.h>
35 #include <sys/kernel.h>
36 #include <sys/malloc.h>
39 #include <sys/systm.h>
43 #include <vm/vm_param.h>
45 #include <dev/pci/pcivar.h>
47 #include <machine/cpufunc.h>
48 #include <machine/cpu.h>
49 #include <machine/smp.h>
51 #include <x86/apicreg.h>
53 #include <xen/xen-os.h>
54 #include <xen/features.h>
55 #include <xen/gnttab.h>
56 #include <xen/hypervisor.h>
58 #include <xen/xen_intr.h>
60 #include <xen/interface/arch-x86/cpuid.h>
61 #include <xen/interface/hvm/params.h>
62 #include <xen/interface/vcpu.h>
64 /*--------------------------- Forward Declarations ---------------------------*/
65 static void xen_hvm_cpu_init(void);
67 /*-------------------------------- Global Data -------------------------------*/
68 enum xen_domain_type xen_domain_type = XEN_NATIVE;
71 struct cpu_ops xen_hvm_cpu_ops = {
72 .cpu_init = xen_hvm_cpu_init,
73 .cpu_resume = xen_hvm_cpu_init
77 static MALLOC_DEFINE(M_XENHVM, "xen_hvm", "Xen HVM PV Support");
80 * If non-zero, the hypervisor has been configured to use a direct
81 * IDT event callback for interrupt injection.
83 int xen_vector_callback_enabled;
86 * Start info flags. ATM this only used to store the initial domain flag for
87 * PVHv2, and it's always empty for HVM guests.
89 uint32_t hvm_start_flags;
91 /*------------------------------- Per-CPU Data -------------------------------*/
92 DPCPU_DEFINE(struct vcpu_info, vcpu_local_info);
93 DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
95 /*------------------ Hypervisor Access Shared Memory Regions -----------------*/
96 shared_info_t *HYPERVISOR_shared_info;
98 /*------------------------------ Sysctl tunables -----------------------------*/
99 int xen_disable_pv_disks = 0;
100 int xen_disable_pv_nics = 0;
101 TUNABLE_INT("hw.xen.disable_pv_disks", &xen_disable_pv_disks);
102 TUNABLE_INT("hw.xen.disable_pv_nics", &xen_disable_pv_nics);
104 /*---------------------- XEN Hypervisor Probe and Setup ----------------------*/
106 static uint32_t cpuid_base;
109 xen_hvm_cpuid_base(void)
111 uint32_t base, regs[4];
113 for (base = 0x40000000; base < 0x40010000; base += 0x100) {
114 do_cpuid(base, regs);
115 if (!memcmp("XenVMMXenVMM", ®s[1], 12)
116 && (regs[0] - base) >= 2)
123 hypervisor_quirks(unsigned int major, unsigned int minor)
126 if (((major < 4) || (major == 4 && minor <= 5)) &&
127 msix_disable_migration == -1) {
129 * Xen hypervisors prior to 4.6.0 do not properly
130 * handle updates to enabled MSI-X table entries,
131 * so disable MSI-X interrupt migration in that
136 "Disabling MSI-X interrupt migration due to Xen hypervisor bug.\n"
137 "Set machdep.msix_disable_migration=0 to forcefully enable it.\n");
138 msix_disable_migration = 1;
144 hypervisor_version(void)
149 do_cpuid(cpuid_base + 1, regs);
151 major = regs[0] >> 16;
152 minor = regs[0] & 0xffff;
153 printf("XEN: Hypervisor version %d.%d detected.\n", major, minor);
155 hypervisor_quirks(major, minor);
159 * Allocate and fill in the hypcall page.
162 xen_hvm_init_hypercall_stubs(enum xen_hvm_init_type init_type)
166 /* Legacy PVH will get here without the cpuid leaf being set. */
168 cpuid_base = xen_hvm_cpuid_base();
172 if (xen_domain() && init_type == XEN_HVM_INIT_LATE) {
174 * If the domain type is already set we can assume that the
175 * hypercall page has been populated too, so just print the
176 * version (and apply any quirks) and exit.
178 hypervisor_version();
182 if (init_type == XEN_HVM_INIT_LATE)
183 hypervisor_version();
186 * Find the hypercall pages.
188 do_cpuid(cpuid_base + 2, regs);
192 wrmsr(regs[1], (init_type == XEN_HVM_INIT_EARLY)
193 ? ((vm_paddr_t)&hypercall_page - KERNBASE)
194 : vtophys(&hypercall_page));
200 xen_hvm_init_shared_info_page(void)
202 struct xen_add_to_physmap xatp;
204 if (xen_pv_domain()) {
206 * Already setup in the PV case, shared_info is passed inside
207 * of the start_info struct at start of day.
212 if (HYPERVISOR_shared_info == NULL) {
213 HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT);
214 if (HYPERVISOR_shared_info == NULL)
215 panic("Unable to allocate Xen shared info page");
218 xatp.domid = DOMID_SELF;
220 xatp.space = XENMAPSPACE_shared_info;
221 xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT;
222 if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
223 panic("HYPERVISOR_memory_op failed");
227 * Tell the hypervisor how to contact us for event channel callbacks.
230 xen_hvm_set_callback(device_t dev)
232 struct xen_hvm_param xhp;
235 if (xen_vector_callback_enabled)
238 xhp.domid = DOMID_SELF;
239 xhp.index = HVM_PARAM_CALLBACK_IRQ;
240 if (xen_feature(XENFEAT_hvm_callback_vector) != 0) {
243 xhp.value = HVM_CALLBACK_VECTOR(IDT_EVTCHN);
244 error = HYPERVISOR_hvm_op(HVMOP_set_param, &xhp);
246 xen_vector_callback_enabled = 1;
249 printf("Xen HVM callback vector registration failed (%d). "
250 "Falling back to emulated device interrupt\n", error);
252 xen_vector_callback_enabled = 0;
255 * Called from early boot or resume.
256 * xenpci will invoke us again later.
261 irq = pci_get_irq(dev);
263 xhp.value = HVM_CALLBACK_GSI(irq);
268 slot = pci_get_slot(dev);
269 pin = pci_get_intpin(dev) - 1;
270 xhp.value = HVM_CALLBACK_PCI_INTX(slot, pin);
273 if (HYPERVISOR_hvm_op(HVMOP_set_param, &xhp) != 0)
274 panic("Can't set evtchn callback");
277 #define XEN_MAGIC_IOPORT 0x10
280 XMI_UNPLUG_IDE_DISKS = 0x01,
281 XMI_UNPLUG_NICS = 0x02,
282 XMI_UNPLUG_IDE_EXCEPT_PRI_MASTER = 0x04
286 xen_hvm_disable_emulated_devices(void)
288 u_short disable_devs = 0;
290 if (xen_pv_domain()) {
292 * No emulated devices in the PV case, so no need to unplug
295 if (xen_disable_pv_disks != 0 || xen_disable_pv_nics != 0)
296 printf("PV devices cannot be disabled in PV guests\n");
300 if (inw(XEN_MAGIC_IOPORT) != XMI_MAGIC)
303 if (xen_disable_pv_disks == 0) {
305 printf("XEN: disabling emulated disks\n");
306 disable_devs |= XMI_UNPLUG_IDE_DISKS;
308 if (xen_disable_pv_nics == 0) {
310 printf("XEN: disabling emulated nics\n");
311 disable_devs |= XMI_UNPLUG_NICS;
314 if (disable_devs != 0)
315 outw(XEN_MAGIC_IOPORT, disable_devs);
319 xen_hvm_init(enum xen_hvm_init_type init_type)
324 if (init_type == XEN_HVM_INIT_CANCELLED_SUSPEND)
327 error = xen_hvm_init_hypercall_stubs(init_type);
330 case XEN_HVM_INIT_LATE:
335 * If xen_domain_type is not set at this point
336 * it means we are inside a (PV)HVM guest, because
337 * for PVH the guest type is set much earlier
338 * (see hammer_time_xen).
341 xen_domain_type = XEN_HVM_DOMAIN;
342 vm_guest = VM_GUEST_XEN;
345 setup_xen_features();
347 cpu_ops = xen_hvm_cpu_ops;
350 case XEN_HVM_INIT_RESUME:
352 panic("Unable to init Xen hypercall stubs on resume");
354 /* Clear stale vcpu_info. */
356 DPCPU_ID_SET(i, vcpu_info, NULL);
359 panic("Unsupported HVM initialization type");
362 xen_vector_callback_enabled = 0;
363 xen_hvm_set_callback(NULL);
366 * On (PV)HVM domains we need to request the hypervisor to
367 * fill the shared info page, for PVH guest the shared_info page
368 * is passed inside the start_info struct and is already set, so this
369 * functions are no-ops.
371 xen_hvm_init_shared_info_page();
372 xen_hvm_disable_emulated_devices();
376 xen_hvm_suspend(void)
381 xen_hvm_resume(bool suspend_cancelled)
384 xen_hvm_init(suspend_cancelled ?
385 XEN_HVM_INIT_CANCELLED_SUSPEND : XEN_HVM_INIT_RESUME);
387 /* Register vcpu_info area for CPU#0. */
392 xen_hvm_sysinit(void *arg __unused)
394 xen_hvm_init(XEN_HVM_INIT_LATE);
396 SYSINIT(xen_hvm_init, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, xen_hvm_sysinit, NULL);
399 xen_hvm_cpu_init(void)
401 struct vcpu_register_vcpu_info info;
402 struct vcpu_info *vcpu_info;
409 if (DPCPU_GET(vcpu_info) != NULL) {
411 * vcpu_info is already set. We're resuming
412 * from a failed migration and our pre-suspend
413 * configuration is still valid.
419 * Set vCPU ID. If available fetch the ID from CPUID, if not just use
422 KASSERT(cpuid_base != 0, ("Invalid base Xen CPUID leaf"));
423 cpuid_count(cpuid_base + 4, 0, regs);
424 KASSERT((regs[0] & XEN_HVM_CPUID_VCPU_ID_PRESENT) ||
426 ("Xen PV domain without vcpu_id in cpuid"));
427 PCPU_SET(vcpu_id, (regs[0] & XEN_HVM_CPUID_VCPU_ID_PRESENT) ?
428 regs[1] : PCPU_GET(acpi_id));
433 * NB: the vCPU info for vCPUs < 32 can be fetched from the shared info
434 * page, but in order to make sure the mapping code is correct always
435 * attempt to map the vCPU info at a custom place.
437 vcpu_info = DPCPU_PTR(vcpu_local_info);
438 cpu = PCPU_GET(vcpu_id);
439 info.mfn = vtophys(vcpu_info) >> PAGE_SHIFT;
440 info.offset = vtophys(vcpu_info) - trunc_page(vtophys(vcpu_info));
442 rc = HYPERVISOR_vcpu_op(VCPUOP_register_vcpu_info, cpu, &info);
444 DPCPU_SET(vcpu_info, &HYPERVISOR_shared_info->vcpu_info[cpu]);
446 DPCPU_SET(vcpu_info, vcpu_info);
448 SYSINIT(xen_hvm_cpu_init, SI_SUB_INTR, SI_ORDER_FIRST, xen_hvm_cpu_init, NULL);
450 /* HVM/PVH start_info accessors */
452 hvm_get_xenstore_mfn(void)
455 return (hvm_get_parameter(HVM_PARAM_STORE_PFN));
459 hvm_get_xenstore_evtchn(void)
462 return (hvm_get_parameter(HVM_PARAM_STORE_EVTCHN));
466 hvm_get_console_mfn(void)
469 return (hvm_get_parameter(HVM_PARAM_CONSOLE_PFN));
473 hvm_get_console_evtchn(void)
476 return (hvm_get_parameter(HVM_PARAM_CONSOLE_EVTCHN));
480 hvm_get_start_flags(void)
483 return (hvm_start_flags);
486 struct hypervisor_info hypervisor_info = {
487 .get_xenstore_mfn = hvm_get_xenstore_mfn,
488 .get_xenstore_evtchn = hvm_get_xenstore_evtchn,
489 .get_console_mfn = hvm_get_console_mfn,
490 .get_console_evtchn = hvm_get_console_evtchn,
491 .get_start_flags = hvm_get_start_flags,