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);
141 max_leaf = query_hypervisor_info();
146 hv_context.guestid = generate_guest_id(0, LINUX_VERSION_CODE, 0);
147 wrmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
149 /* See if the hypercall page is already set */
150 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
152 virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
157 hypercall_msr.enable = 1;
159 hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
160 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
162 /* Confirm that hypercall page did get setup. */
163 hypercall_msr.as_uint64 = 0;
164 rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
166 if (!hypercall_msr.enable)
169 hv_context.hypercall_page = virtaddr;
171 /* Setup the global signal event param for the signal event hypercall */
172 hv_context.signal_event_buffer =
173 kmalloc(sizeof(struct hv_input_signal_event_buffer),
175 if (!hv_context.signal_event_buffer)
178 hv_context.signal_event_param =
179 (struct hv_input_signal_event *)
180 (ALIGN((unsigned long)
181 hv_context.signal_event_buffer,
182 HV_HYPERCALL_PARAM_ALIGN));
183 hv_context.signal_event_param->connectionid.asu32 = 0;
184 hv_context.signal_event_param->connectionid.u.id =
185 VMBUS_EVENT_CONNECTION_ID;
186 hv_context.signal_event_param->flag_number = 0;
187 hv_context.signal_event_param->rsvdz = 0;
193 if (hypercall_msr.enable) {
194 hypercall_msr.as_uint64 = 0;
195 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
205 * hv_cleanup - Cleanup routine.
207 * This routine is called normally during driver unloading or exiting.
209 void hv_cleanup(void)
211 union hv_x64_msr_hypercall_contents hypercall_msr;
213 /* Reset our OS id */
214 wrmsrl(HV_X64_MSR_GUEST_OS_ID, 0);
216 kfree(hv_context.signal_event_buffer);
217 hv_context.signal_event_buffer = NULL;
218 hv_context.signal_event_param = NULL;
220 if (hv_context.hypercall_page) {
221 hypercall_msr.as_uint64 = 0;
222 wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
223 vfree(hv_context.hypercall_page);
224 hv_context.hypercall_page = NULL;
229 * hv_post_message - Post a message using the hypervisor message IPC.
231 * This involves a hypercall.
233 int hv_post_message(union hv_connection_id connection_id,
234 enum hv_message_type message_type,
235 void *payload, size_t payload_size)
237 struct aligned_input {
239 struct hv_input_post_message msg;
242 struct hv_input_post_message *aligned_msg;
246 if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
249 addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
253 aligned_msg = (struct hv_input_post_message *)
254 (ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
256 aligned_msg->connectionid = connection_id;
257 aligned_msg->message_type = message_type;
258 aligned_msg->payload_size = payload_size;
259 memcpy((void *)aligned_msg->payload, payload, payload_size);
261 status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
272 * Signal an event on the specified connection using the hypervisor event IPC.
274 * This involves a hypercall.
276 u16 hv_signal_event(void *con_id)
280 status = (do_hypercall(HVCALL_SIGNAL_EVENT, con_id, NULL) & 0xFFFF);
286 * hv_synic_init - Initialize the Synthethic Interrupt Controller.
288 * If it is already initialized by another entity (ie x2v shim), we need to
289 * retrieve the initialized message and event pages. Otherwise, we create and
290 * initialize the message and event pages.
292 void hv_synic_init(void *irqarg)
295 union hv_synic_simp simp;
296 union hv_synic_siefp siefp;
297 union hv_synic_sint shared_sint;
298 union hv_synic_scontrol sctrl;
300 u32 irq_vector = *((u32 *)(irqarg));
301 int cpu = smp_processor_id();
303 if (!hv_context.hypercall_page)
306 /* Check the version */
307 rdmsrl(HV_X64_MSR_SVERSION, version);
309 hv_context.synic_message_page[cpu] =
310 (void *)get_zeroed_page(GFP_ATOMIC);
312 if (hv_context.synic_message_page[cpu] == NULL) {
313 pr_err("Unable to allocate SYNIC message page\n");
317 hv_context.synic_event_page[cpu] =
318 (void *)get_zeroed_page(GFP_ATOMIC);
320 if (hv_context.synic_event_page[cpu] == NULL) {
321 pr_err("Unable to allocate SYNIC event page\n");
325 /* Setup the Synic's message page */
326 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
327 simp.simp_enabled = 1;
328 simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
331 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
333 /* Setup the Synic's event page */
334 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
335 siefp.siefp_enabled = 1;
336 siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
339 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
341 /* Setup the shared SINT. */
342 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
344 shared_sint.as_uint64 = 0;
345 shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
346 shared_sint.masked = false;
347 shared_sint.auto_eoi = false;
349 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
351 /* Enable the global synic bit */
352 rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
355 wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
357 hv_context.synic_initialized = true;
361 if (hv_context.synic_event_page[cpu])
362 free_page((unsigned long)hv_context.synic_event_page[cpu]);
364 if (hv_context.synic_message_page[cpu])
365 free_page((unsigned long)hv_context.synic_message_page[cpu]);
370 * hv_synic_cleanup - Cleanup routine for hv_synic_init().
372 void hv_synic_cleanup(void *arg)
374 union hv_synic_sint shared_sint;
375 union hv_synic_simp simp;
376 union hv_synic_siefp siefp;
377 int cpu = smp_processor_id();
379 if (!hv_context.synic_initialized)
382 rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
384 shared_sint.masked = 1;
386 /* Need to correctly cleanup in the case of SMP!!! */
387 /* Disable the interrupt */
388 wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
390 rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
391 simp.simp_enabled = 0;
392 simp.base_simp_gpa = 0;
394 wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
396 rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
397 siefp.siefp_enabled = 0;
398 siefp.base_siefp_gpa = 0;
400 wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
402 free_page((unsigned long)hv_context.synic_message_page[cpu]);
403 free_page((unsigned long)hv_context.synic_event_page[cpu]);