/*
* Copyright (c) 2009, Microsoft Corporation.
*
* This program is free software; you can redistribute it and/or modify it
* under the terms and conditions of the GNU General Public License,
* version 2, as published by the Free Software Foundation.
*
* This program is distributed in the hope it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along with
* this program; if not, write to the Free Software Foundation, Inc., 59 Temple
* Place - Suite 330, Boston, MA 02111-1307 USA.
*
* Authors:
* Haiyang Zhang <haiyangz@microsoft.com>
* Hank Janssen <hjanssen@microsoft.com>
*
*/
#include <linux/kernel.h>
#include <linux/mm.h>
#include <linux/slab.h>
#include <linux/vmalloc.h>
#include "hv_api.h"
#include "logging.h"
#include "vmbus_private.h"
/* The one and only */
struct hv_context hv_context = {
.synic_initialized = false,
.hypercall_page = NULL,
.signal_event_param = NULL,
.signal_event_buffer = NULL,
};
/*
* query_hypervisor_presence
* - Query the cpuid for presence of windows hypervisor
*/
static int query_hypervisor_presence(void)
{
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int op;
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_VERSION_FEATURES;
cpuid(op, &eax, &ebx, &ecx, &edx);
return ecx & HV_PRESENT_BIT;
}
/*
* query_hypervisor_info - Get version info of the windows hypervisor
*/
static int query_hypervisor_info(void)
{
unsigned int eax;
unsigned int ebx;
unsigned int ecx;
unsigned int edx;
unsigned int max_leaf;
unsigned int op;
/*
* Its assumed that this is called after confirming that Viridian
* is present. Query id and revision.
*/
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_VENDOR_MAXFUNCTION;
cpuid(op, &eax, &ebx, &ecx, &edx);
DPRINT_INFO(VMBUS, "Vendor ID: %c%c%c%c%c%c%c%c%c%c%c%c",
(ebx & 0xFF),
((ebx >> 8) & 0xFF),
((ebx >> 16) & 0xFF),
((ebx >> 24) & 0xFF),
(ecx & 0xFF),
((ecx >> 8) & 0xFF),
((ecx >> 16) & 0xFF),
((ecx >> 24) & 0xFF),
(edx & 0xFF),
((edx >> 8) & 0xFF),
((edx >> 16) & 0xFF),
((edx >> 24) & 0xFF));
max_leaf = eax;
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_INTERFACE;
cpuid(op, &eax, &ebx, &ecx, &edx);
DPRINT_INFO(VMBUS, "Interface ID: %c%c%c%c",
(eax & 0xFF),
((eax >> 8) & 0xFF),
((eax >> 16) & 0xFF),
((eax >> 24) & 0xFF));
if (max_leaf >= HVCPUID_VERSION) {
eax = 0;
ebx = 0;
ecx = 0;
edx = 0;
op = HVCPUID_VERSION;
cpuid(op, &eax, &ebx, &ecx, &edx);
DPRINT_INFO(VMBUS, "OS Build:%d-%d.%d-%d-%d.%d",\
eax,
ebx >> 16,
ebx & 0xFFFF,
ecx,
edx >> 24,
edx & 0xFFFFFF);
}
return max_leaf;
}
/*
* do_hypercall- Invoke the specified hypercall
*/
static u64 do_hypercall(u64 control, void *input, void *output)
{
#ifdef CONFIG_X86_64
u64 hv_status = 0;
u64 input_address = (input) ? virt_to_phys(input) : 0;
u64 output_address = (output) ? virt_to_phys(output) : 0;
volatile void *hypercall_page = hv_context.hypercall_page;
DPRINT_DBG(VMBUS, "Hypercall <control %llx input phys %llx virt %p "
"output phys %llx virt %p hypercall %p>",
control, input_address, input,
output_address, output, hypercall_page);
__asm__ __volatile__("mov %0, %%r8" : : "r" (output_address) : "r8");
__asm__ __volatile__("call *%3" : "=a" (hv_status) :
"c" (control), "d" (input_address),
"m" (hypercall_page));
DPRINT_DBG(VMBUS, "Hypercall <return %llx>", hv_status);
return hv_status;
#else
u32 control_hi = control >> 32;
u32 control_lo = control & 0xFFFFFFFF;
u32 hv_status_hi = 1;
u32 hv_status_lo = 1;
u64 input_address = (input) ? virt_to_phys(input) : 0;
u32 input_address_hi = input_address >> 32;
u32 input_address_lo = input_address & 0xFFFFFFFF;
u64 output_address = (output) ? virt_to_phys(output) : 0;
u32 output_address_hi = output_address >> 32;
u32 output_address_lo = output_address & 0xFFFFFFFF;
volatile void *hypercall_page = hv_context.hypercall_page;
DPRINT_DBG(VMBUS, "Hypercall <control %llx input %p output %p>",
control, input, output);
__asm__ __volatile__ ("call *%8" : "=d"(hv_status_hi),
"=a"(hv_status_lo) : "d" (control_hi),
"a" (control_lo), "b" (input_address_hi),
"c" (input_address_lo), "D"(output_address_hi),
"S"(output_address_lo), "m" (hypercall_page));
DPRINT_DBG(VMBUS, "Hypercall <return %llx>",
hv_status_lo | ((u64)hv_status_hi << 32));
return hv_status_lo | ((u64)hv_status_hi << 32);
#endif /* !x86_64 */
}
/*
* hv_init - Main initialization routine.
*
* This routine must be called before any other routines in here are called
*/
int hv_init(void)
{
int ret = 0;
int max_leaf;
union hv_x64_msr_hypercall_contents hypercall_msr;
void *virtaddr = NULL;
memset(hv_context.synic_event_page, 0, sizeof(void *) * MAX_NUM_CPUS);
memset(hv_context.synic_message_page, 0,
sizeof(void *) * MAX_NUM_CPUS);
if (!query_hypervisor_presence()) {
DPRINT_ERR(VMBUS, "No Windows hypervisor detected!!");
goto Cleanup;
}
DPRINT_INFO(VMBUS,
"Windows hypervisor detected! Retrieving more info...");
max_leaf = query_hypervisor_info();
/* HvQueryHypervisorFeatures(maxLeaf); */
/*
* We only support running on top of Hyper-V
*/
rdmsrl(HV_X64_MSR_GUEST_OS_ID, hv_context.guestid);
if (hv_context.guestid != 0) {
DPRINT_ERR(VMBUS, "Unknown guest id (0x%llx)!!",
hv_context.guestid);
goto Cleanup;
}
/* Write our OS info */
wrmsrl(HV_X64_MSR_GUEST_OS_ID, HV_LINUX_GUEST_ID);
hv_context.guestid = HV_LINUX_GUEST_ID;
/* See if the hypercall page is already set */
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
/*
* Allocate the hypercall page memory
* virtaddr = osd_page_alloc(1);
*/
virtaddr = __vmalloc(PAGE_SIZE, GFP_KERNEL, PAGE_KERNEL_EXEC);
if (!virtaddr) {
DPRINT_ERR(VMBUS,
"unable to allocate hypercall page!!");
goto Cleanup;
}
hypercall_msr.enable = 1;
hypercall_msr.guest_physical_address = vmalloc_to_pfn(virtaddr);
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
/* Confirm that hypercall page did get setup. */
hypercall_msr.as_uint64 = 0;
rdmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
if (!hypercall_msr.enable) {
DPRINT_ERR(VMBUS, "unable to set hypercall page!!");
goto Cleanup;
}
hv_context.hypercall_page = virtaddr;
DPRINT_INFO(VMBUS, "Hypercall page VA=%p, PA=0x%0llx",
hv_context.hypercall_page,
(u64)hypercall_msr.guest_physical_address << PAGE_SHIFT);
/* Setup the global signal event param for the signal event hypercall */
hv_context.signal_event_buffer =
kmalloc(sizeof(struct hv_input_signal_event_buffer),
GFP_KERNEL);
if (!hv_context.signal_event_buffer)
goto Cleanup;
hv_context.signal_event_param =
(struct hv_input_signal_event *)
(ALIGN((unsigned long)
hv_context.signal_event_buffer,
HV_HYPERCALL_PARAM_ALIGN));
hv_context.signal_event_param->connectionid.asu32 = 0;
hv_context.signal_event_param->connectionid.u.id =
VMBUS_EVENT_CONNECTION_ID;
hv_context.signal_event_param->flag_number = 0;
hv_context.signal_event_param->rsvdz = 0;
return ret;
Cleanup:
if (virtaddr) {
if (hypercall_msr.enable) {
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
}
vfree(virtaddr);
}
ret = -1;
return ret;
}
/*
* hv_cleanup - Cleanup routine.
*
* This routine is called normally during driver unloading or exiting.
*/
void hv_cleanup(void)
{
union hv_x64_msr_hypercall_contents hypercall_msr;
kfree(hv_context.signal_event_buffer);
hv_context.signal_event_buffer = NULL;
hv_context.signal_event_param = NULL;
if (hv_context.hypercall_page) {
hypercall_msr.as_uint64 = 0;
wrmsrl(HV_X64_MSR_HYPERCALL, hypercall_msr.as_uint64);
vfree(hv_context.hypercall_page);
hv_context.hypercall_page = NULL;
}
}
/*
* hv_post_message - Post a message using the hypervisor message IPC.
*
* This involves a hypercall.
*/
u16 hv_post_message(union hv_connection_id connection_id,
enum hv_message_type message_type,
void *payload, size_t payload_size)
{
struct aligned_input {
u64 alignment8;
struct hv_input_post_message msg;
};
struct hv_input_post_message *aligned_msg;
u16 status;
unsigned long addr;
if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
return -1;
addr = (unsigned long)kmalloc(sizeof(struct aligned_input), GFP_ATOMIC);
if (!addr)
return -1;
aligned_msg = (struct hv_input_post_message *)
(ALIGN(addr, HV_HYPERCALL_PARAM_ALIGN));
aligned_msg->connectionid = connection_id;
aligned_msg->message_type = message_type;
aligned_msg->payload_size = payload_size;
memcpy((void *)aligned_msg->payload, payload, payload_size);
status = do_hypercall(HVCALL_POST_MESSAGE, aligned_msg, NULL)
& 0xFFFF;
kfree((void *)addr);
return status;
}
/*
* hv_signal_event -
* Signal an event on the specified connection using the hypervisor event IPC.
*
* This involves a hypercall.
*/
u16 hv_signal_event(void)
{
u16 status;
status = do_hypercall(HVCALL_SIGNAL_EVENT,
hv_context.signal_event_param,
NULL) & 0xFFFF;
return status;
}
/*
* hv_synic_init - Initialize the Synthethic Interrupt Controller.
*
* If it is already initialized by another entity (ie x2v shim), we need to
* retrieve the initialized message and event pages. Otherwise, we create and
* initialize the message and event pages.
*/
void hv_synic_init(void *irqarg)
{
u64 version;
union hv_synic_simp simp;
union hv_synic_siefp siefp;
union hv_synic_sint shared_sint;
union hv_synic_scontrol sctrl;
u32 irq_vector = *((u32 *)(irqarg));
int cpu = smp_processor_id();
if (!hv_context.hypercall_page)
return;
/* Check the version */
rdmsrl(HV_X64_MSR_SVERSION, version);
DPRINT_INFO(VMBUS, "SynIC version: %llx", version);
hv_context.synic_message_page[cpu] =
(void *)get_zeroed_page(GFP_ATOMIC);
if (hv_context.synic_message_page[cpu] == NULL) {
DPRINT_ERR(VMBUS,
"unable to allocate SYNIC message page!!");
goto Cleanup;
}
hv_context.synic_event_page[cpu] =
(void *)get_zeroed_page(GFP_ATOMIC);
if (hv_context.synic_event_page[cpu] == NULL) {
DPRINT_ERR(VMBUS,
"unable to allocate SYNIC event page!!");
goto Cleanup;
}
/* Setup the Synic's message page */
rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
simp.simp_enabled = 1;
simp.base_simp_gpa = virt_to_phys(hv_context.synic_message_page[cpu])
>> PAGE_SHIFT;
DPRINT_DBG(VMBUS, "HV_X64_MSR_SIMP msr set to: %llx", simp.as_uint64);
wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
/* Setup the Synic's event page */
rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
siefp.siefp_enabled = 1;
siefp.base_siefp_gpa = virt_to_phys(hv_context.synic_event_page[cpu])
>> PAGE_SHIFT;
DPRINT_DBG(VMBUS, "HV_X64_MSR_SIEFP msr set to: %llx", siefp.as_uint64);
wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
/* Setup the interception SINT. */
/* wrmsrl((HV_X64_MSR_SINT0 + HV_SYNIC_INTERCEPTION_SINT_INDEX), */
/* interceptionSint.as_uint64); */
/* Setup the shared SINT. */
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
shared_sint.as_uint64 = 0;
shared_sint.vector = irq_vector; /* HV_SHARED_SINT_IDT_VECTOR + 0x20; */
shared_sint.masked = false;
shared_sint.auto_eoi = true;
DPRINT_DBG(VMBUS, "HV_X64_MSR_SINT1 msr set to: %llx",
shared_sint.as_uint64);
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
/* Enable the global synic bit */
rdmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
sctrl.enable = 1;
wrmsrl(HV_X64_MSR_SCONTROL, sctrl.as_uint64);
hv_context.synic_initialized = true;
return;
Cleanup:
if (hv_context.synic_event_page[cpu])
free_page((unsigned long)hv_context.synic_event_page[cpu]);
if (hv_context.synic_message_page[cpu])
free_page((unsigned long)hv_context.synic_message_page[cpu]);
return;
}
/*
* hv_synic_cleanup - Cleanup routine for hv_synic_init().
*/
void hv_synic_cleanup(void *arg)
{
union hv_synic_sint shared_sint;
union hv_synic_simp simp;
union hv_synic_siefp siefp;
int cpu = smp_processor_id();
if (!hv_context.synic_initialized)
return;
rdmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
shared_sint.masked = 1;
/* Need to correctly cleanup in the case of SMP!!! */
/* Disable the interrupt */
wrmsrl(HV_X64_MSR_SINT0 + VMBUS_MESSAGE_SINT, shared_sint.as_uint64);
rdmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
simp.simp_enabled = 0;
simp.base_simp_gpa = 0;
wrmsrl(HV_X64_MSR_SIMP, simp.as_uint64);
rdmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
siefp.siefp_enabled = 0;
siefp.base_siefp_gpa = 0;
wrmsrl(HV_X64_MSR_SIEFP, siefp.as_uint64);
free_page((unsigned long)hv_context.synic_message_page[cpu]);
free_page((unsigned long)hv_context.synic_event_page[cpu]);
}