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/*-
* Copyright (c) 2009-2012,2016-2017 Microsoft Corp.
* Copyright (c) 2012 NetApp Inc.
* Copyright (c) 2012 Citrix Inc.
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* 1. Redistributions of source code must retain the above copyright
* notice unmodified, this list of conditions, and the following
* disclaimer.
* 2. Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in the
* documentation and/or other materials provided with the distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
*/
/**
* Implements low-level interactions with Hyper-V/Azure
*/
#include <sys/param.h>
#include <sys/kernel.h>
#include <sys/malloc.h>
#include <sys/systm.h>
#include <sys/timetc.h>
#include <sys/cpuset.h>
#include <vm/vm.h>
#include <vm/vm_extern.h>
#include <vm/vm_kern.h>
#include <vm/pmap.h>
#include <dev/hyperv/include/hyperv.h>
#include <dev/hyperv/include/hyperv_busdma.h>
#if defined(__aarch64__)
#include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h>
#include <dev/hyperv/vmbus/aarch64/hyperv_reg.h>
#else
#include <dev/hyperv/vmbus/x86/hyperv_machdep.h>
#include <dev/hyperv/vmbus/x86/hyperv_reg.h>
#endif
#include <dev/hyperv/vmbus/vmbus_var.h>
#include <dev/hyperv/vmbus/hyperv_common_reg.h>
#include <dev/hyperv/vmbus/hyperv_var.h>
#define HYPERV_FREEBSD_BUILD 0ULL
#define HYPERV_FREEBSD_VERSION ((uint64_t)__FreeBSD_version)
#define HYPERV_FREEBSD_OSID 0ULL
#define MSR_HV_GUESTID_BUILD_FREEBSD \
(HYPERV_FREEBSD_BUILD & MSR_HV_GUESTID_BUILD_MASK)
#define MSR_HV_GUESTID_VERSION_FREEBSD \
((HYPERV_FREEBSD_VERSION << MSR_HV_GUESTID_VERSION_SHIFT) & \
MSR_HV_GUESTID_VERSION_MASK)
#define MSR_HV_GUESTID_OSID_FREEBSD \
((HYPERV_FREEBSD_OSID << MSR_HV_GUESTID_OSID_SHIFT) & \
MSR_HV_GUESTID_OSID_MASK)
#define MSR_HV_GUESTID_FREEBSD \
(MSR_HV_GUESTID_BUILD_FREEBSD | \
MSR_HV_GUESTID_VERSION_FREEBSD | \
MSR_HV_GUESTID_OSID_FREEBSD | \
MSR_HV_GUESTID_OSTYPE_FREEBSD)
static bool hyperv_identify(void);
static void hypercall_memfree(void);
static struct hypercall_ctx hypercall_context;
uint64_t
hypercall_post_message(bus_addr_t msg_paddr)
{
return hypercall_md(hypercall_context.hc_addr,
HYPERCALL_POST_MESSAGE, msg_paddr, 0);
}
uint64_t
hypercall_signal_event(bus_addr_t monprm_paddr)
{
return hypercall_md(hypercall_context.hc_addr,
HYPERCALL_SIGNAL_EVENT, monprm_paddr, 0);
}
static inline int hv_result(uint64_t status)
{
return status & HV_HYPERCALL_RESULT_MASK;
}
static inline bool hv_result_success(uint64_t status)
{
return hv_result(status) == HV_STATUS_SUCCESS;
}
static inline unsigned int hv_repcomp(uint64_t status)
{
/* Bits [43:32] of status have 'Reps completed' data. */
return ((status & HV_HYPERCALL_REP_COMP_MASK) >>
HV_HYPERCALL_REP_COMP_OFFSET);
}
/*
* Rep hypercalls. Callers of this functions are supposed to ensure that
* rep_count and varhead_size comply with Hyper-V hypercall definition.
*/
uint64_t
hv_do_rep_hypercall(uint16_t code, uint16_t rep_count, uint16_t varhead_size,
uint64_t input, uint64_t output)
{
uint64_t control = code;
uint64_t status;
uint16_t rep_comp;
control |= (uint64_t)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
control |= (uint64_t)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
do {
status = hypercall_do_md(control, input, output);
if (!hv_result_success(status))
return status;
rep_comp = hv_repcomp(status);
control &= ~HV_HYPERCALL_REP_START_MASK;
control |= (uint64_t)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
} while (rep_comp < rep_count);
if (hv_result_success(status))
return HV_STATUS_SUCCESS;
return status;
}
uint64_t
hypercall_do_md(uint64_t input_val, uint64_t input_addr, uint64_t out_addr)
{
uint64_t phys_inaddr, phys_outaddr;
phys_inaddr = input_addr ? vtophys(input_addr) : 0;
phys_outaddr = out_addr ? vtophys(out_addr) : 0;
return hypercall_md(hypercall_context.hc_addr,
input_val, phys_inaddr, phys_outaddr);
}
int
hyperv_guid2str(const struct hyperv_guid *guid, char *buf, size_t sz)
{
const uint8_t *d = guid->hv_guid;
return snprintf(buf, sz, "%02x%02x%02x%02x-"
"%02x%02x-%02x%02x-%02x%02x-"
"%02x%02x%02x%02x%02x%02x",
d[3], d[2], d[1], d[0],
d[5], d[4], d[7], d[6], d[8], d[9],
d[10], d[11], d[12], d[13], d[14], d[15]);
}
static bool
hyperv_identify(void)
{
return(hyperv_identify_features());
}
static void
hyperv_init(void *dummy __unused)
{
if (!hyperv_identify()) {
/* Not Hyper-V; reset guest id to the generic one. */
if (vm_guest == VM_GUEST_HV)
vm_guest = VM_GUEST_VM;
return;
}
/* Set guest id */
WRMSR(MSR_HV_GUEST_OS_ID, MSR_HV_GUESTID_FREEBSD);
hyperv_init_tc();
}
SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
NULL);
static void
hypercall_memfree(void)
{
kmem_free(hypercall_context.hc_addr, PAGE_SIZE);
hypercall_context.hc_addr = NULL;
}
static void
hypercall_create(void *arg __unused)
{
int ret;
if (vm_guest != VM_GUEST_HV)
return;
/*
* NOTE:
* - busdma(9), i.e. hyperv_dmamem APIs, can _not_ be used due to
* the NX bit.
* - Assume kmem_malloc() returns properly aligned memory.
*/
hypercall_context.hc_addr = kmem_malloc(PAGE_SIZE, M_EXEC | M_WAITOK);
hypercall_context.hc_paddr = vtophys(hypercall_context.hc_addr);
ret = hypercall_page_setup(hypercall_context.hc_paddr);
if (ret) {
hypercall_memfree();
return;
}
if (bootverbose)
printf("hyperv: Hypercall created\n");
}
SYSINIT(hypercall_ctor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_create, NULL);
static void
hypercall_destroy(void *arg __unused)
{
if (hypercall_context.hc_addr == NULL)
return;
hypercall_disable();
hypercall_memfree();
if (bootverbose)
printf("hyperv: Hypercall destroyed\n");
}
SYSUNINIT(hypercall_dtor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_destroy,
NULL);
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