2 * Copyright (c) 2009, Microsoft Corporation.
4 * This program is free software; you can redistribute it and/or modify it
5 * under the terms and conditions of the GNU General Public License,
6 * version 2, as published by the Free Software Foundation.
8 * This program is distributed in the hope it will be useful, but WITHOUT
9 * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
10 * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
13 * You should have received a copy of the GNU General Public License along with
14 * this program; if not, write to the Free Software Foundation, Inc., 59 Temple
15 * Place - Suite 330, Boston, MA 02111-1307 USA.
18 * Haiyang Zhang <haiyangz@microsoft.com>
19 * Hank Janssen <hjanssen@microsoft.com>
22 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
24 #include <linux/kernel.h>
26 #include <linux/slab.h>
27 #include <linux/vmalloc.h>
28 #include <linux/hyperv.h>
29 #include <linux/version.h>
30 #include <asm/hyperv.h>
31 #include "hyperv_vmbus.h"
33 /* The one and only */
34 struct hv_context hv_context = {
35 .synic_initialized = false,
36 .hypercall_page = NULL,
37 .signal_event_param = NULL,
38 .signal_event_buffer = NULL,
42 * query_hypervisor_info - Get version info of the windows hypervisor
44 static int query_hypervisor_info(void)
50 unsigned int max_leaf;
54 * Its assumed that this is called after confirming that Viridian
55 * is present. Query id and revision.
61 op = HVCPUID_VENDOR_MAXFUNCTION;
62 cpuid(op, &eax, &ebx, &ecx, &edx);
66 if (max_leaf >= HVCPUID_VERSION) {
72 cpuid(op, &eax, &ebx, &ecx, &edx);
73 pr_info("Hyper-V Host OS Build:%d-%d.%d-%d-%d.%d\n",
85 * do_hypercall- Invoke the specified hypercall
87 static u64 do_hypercall(u64 control, void *input, void *output)
91 u64 input_address = (input) ? virt_to_phys(input) : 0;
92 u64 output_address = (output) ? virt_to_phys(output) : 0;
93 void *hypercall_page = hv_context.hypercall_page;
95 __asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
96 __asm__ __volatile__("call *%3" : "=a" (hv_status) :
97 "c" (control), "d" (input_address),
98 "m" (hypercall_page));
104 u32 control_hi = control >> 32;
105 u32 control_lo = control & 0xFFFFFFFF;
106 u32 hv_status_hi = 1;
107 u32 hv_status_lo = 1;
108 u64 input_address = (input) ? virt_to_phys(input) : 0;
109 u32 input_address_hi = input_address >> 32;
110 u32 input_address_lo = input_address & 0xFFFFFFFF;
111 u64 output_address = (output) ? virt_to_phys(output) : 0;
112 u32 output_address_hi = output_address >> 32;
113 u32 output_address_lo = output_address & 0xFFFFFFFF;
114 void *hypercall_page = hv_context.hypercall_page;
116 __asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
117 "=a"(hv_status_lo) : "d" (control_hi),
118 "a" (control_lo), "b" (input_address_hi),
119 "c" (input_address_lo), "D"(output_address_hi),
120 "S"(output_address_lo), "m" (hypercall_page));
122 return hv_status_lo | ((u64)hv_status_hi << 32);
127 * hv_init - Main initialization routine.
129 * This routine must be called before any other routines in here are called
134 union hv_x64_msr_hypercall_contents hypercall_msr;
135 void *virtaddr = NULL;
137 memset(hv_context.synic_event_page, 0, sizeof(void *) * NR_CPUS);
138 memset(hv_context.synic_message_page, 0,
139 sizeof(void *) * NR_CPUS);
140 memset(hv_context.vp_index, 0,
141 sizeof(int) * NR_CPUS);
143 max_leaf = query_hypervisor_info();
148 hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
149 wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
151 /* See if the hypercall page is already set */
152 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
154 virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
159 hypercall_msr.enable = 1;
161 hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
162 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
164 /* Confirm that hypercall page did get setup. */
165 hypercall_msr.as_uint64 = 0;
166 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
168 if (!hypercall_msr.enable)
171 hv_context.hypercall_page = virtaddr;
173 /* Setup the global signal event param for the signal event hypercall */
174 hv_context.signal_event_buffer =
175 kmalloc(sizeof(struct hv_input_signal_event_buffer),
177 if (!hv_context.signal_event_buffer)
180 hv_context.signal_event_param =
181 (struct hv_input_signal_event *)
182 (ALIGN((unsigned long)
183 hv_context.signal_event_buffer,
184 HV_HYPERCALL_PARAM_ALIGN));
185 hv_context.signal_event_param->connectionid.asu32 = 0;
186 hv_context.signal_event_param->connectionid.u.id =
187 VMBUS_EVENT_CONNECTION_ID;
188 hv_context.signal_event_param->flag_number = 0;
189 hv_context.signal_event_param->rsvdz = 0;
195 if (hypercall_msr.enable) {
196 hypercall_msr.as_uint64 = 0;
197 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
207 * hv_cleanup - Cleanup routine.
209 * This routine is called normally during driver unloading or exiting.
211 void hv_cleanup(void)
213 union hv_x64_msr_hypercall_contents hypercall_msr;
215 /* Reset our OS id */
216 wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
218 kfree(hv_context.signal_event_buffer);
219 hv_context.signal_event_buffer = NULL;
220 hv_context.signal_event_param = NULL;
222 if (hv_context.hypercall_page) {
223 hypercall_msr.as_uint64 = 0;
224 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
225 vfree(hv_context.hypercall_page);
226 hv_context.hypercall_page = NULL;
231 * hv_post_message - Post a message using the hypervisor message IPC.
233 * This involves a hypercall.
235 int hv_post_message(union hv_connection_id connection_id,
236 enum hv_message_type message_type,
237 void *payload, size_t payload_size)
239 struct aligned_input {
241 struct hv_input_post_message msg;
244 struct hv_input_post_message *aligned_msg;
248 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
251 addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
255 aligned_msg = (struct hv_input_post_message *)
256 (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
258 aligned_msg->connectionid = connection_id;
259 aligned_msg->message_type = message_type;
260 aligned_msg->payload_size = payload_size;
261 memcpy((void *)aligned_msg->payload, payload, payload_size);
263 status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
274 * Signal an event on the specified connection using the hypervisor event IPC.
276 * This involves a hypercall.
278 u16 hv_signal_event(void *con_id)
282 status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
288 * hv_synic_init - Initialize the Synthethic Interrupt Controller.
290 * If it is already initialized by another entity (ie x2v shim), we need to
291 * retrieve the initialized message and event pages. Otherwise, we create and
292 * initialize the message and event pages.
294 void hv_synic_init(void *irqarg)
297 union hv_synic_simp simp;
298 union hv_synic_siefp siefp;
299 union hv_synic_sint shared_sint;
300 union hv_synic_scontrol sctrl;
303 u32 irq_vector = *((u32 *)(irqarg));
304 int cpu = smp_processor_id();
306 if (!hv_context.hypercall_page)
309 /* Check the version */
310 rdmsrl(HV_X64_MSR_SVERSION, version);
312 hv_context.synic_message_page[cpu] =
313 (void *)get_zeroed_page(GFP_ATOMIC);
315 if (hv_context.synic_message_page[cpu] == NULL) {
316 pr_err("Unable to allocate SYNIC message page\n");
320 hv_context.synic_event_page[cpu] =
321 (void *)get_zeroed_page(GFP_ATOMIC);
323 if (hv_context.synic_event_page[cpu] == NULL) {
324 pr_err("Unable to allocate SYNIC event page\n");
328 /* Setup the Synic's message page */
329 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
330 simp.simp_enabled = 1;
331 simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
334 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
336 /* Setup the Synic's event page */
337 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
338 siefp.siefp_enabled = 1;
339 siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
342 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
344 /* Setup the shared SINT. */
345 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
347 shared_sint.as_uint64 = 0;
348 shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
349 shared_sint.masked = false;
350 shared_sint.auto_eoi = false;
352 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
354 /* Enable the global synic bit */
355 rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
358 wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
360 hv_context.synic_initialized = true;
363 * Setup the mapping between Hyper-V's notion
364 * of cpuid and Linux' notion of cpuid.
365 * This array will be indexed using Linux cpuid.
367 rdmsrl(HV_X64_MSR_VP_INDEX, vp_index);
368 hv_context.vp_index[cpu] = (u32)vp_index;
372 if (hv_context.synic_event_page[cpu])
373 free_page((unsigned long)hv_context.synic_event_page[cpu]);
375 if (hv_context.synic_message_page[cpu])
376 free_page((unsigned long)hv_context.synic_message_page[cpu]);
381 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
383 void hv_synic_cleanup(void *arg)
385 union hv_synic_sint shared_sint;
386 union hv_synic_simp simp;
387 union hv_synic_siefp siefp;
388 int cpu = smp_processor_id();
390 if (!hv_context.synic_initialized)
393 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
395 shared_sint.masked = 1;
397 /* Need to correctly cleanup in the case of SMP!!! */
398 /* Disable the interrupt */
399 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
401 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
402 simp.simp_enabled = 0;
403 simp.base_simp_gpa = 0;
405 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
407 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
408 siefp.siefp_enabled = 0;
409 siefp.base_siefp_gpa = 0;
411 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
413 free_page((unsigned long)hv_context.synic_message_page[cpu]);
414 free_page((unsigned long)hv_context.synic_event_page[cpu]);