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-rw-r--r--sys/dev/hyperv/vmbus/hyperv.c382
1 files changed, 382 insertions, 0 deletions
diff --git a/sys/dev/hyperv/vmbus/hyperv.c b/sys/dev/hyperv/vmbus/hyperv.c
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+++ b/sys/dev/hyperv/vmbus/hyperv.c
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+/*-
+ * Copyright (c) 2009-2012,2016 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 Hypver-V/Azure
+ */
+#include <sys/cdefs.h>
+__FBSDID("$FreeBSD$");
+
+#include <sys/param.h>
+#include <sys/kernel.h>
+#include <sys/malloc.h>
+#include <sys/pcpu.h>
+#include <sys/timetc.h>
+#include <machine/bus.h>
+#include <machine/md_var.h>
+#include <vm/vm.h>
+#include <vm/vm_param.h>
+#include <vm/pmap.h>
+
+#include <dev/hyperv/include/hyperv_busdma.h>
+#include <dev/hyperv/vmbus/hv_vmbus_priv.h>
+#include <dev/hyperv/vmbus/hyperv_machdep.h>
+#include <dev/hyperv/vmbus/hyperv_reg.h>
+#include <dev/hyperv/vmbus/hyperv_var.h>
+#include <dev/hyperv/vmbus/vmbus_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)
+
+struct hypercall_ctx {
+ void *hc_addr;
+ struct hyperv_dma hc_dma;
+};
+
+static u_int hyperv_get_timecount(struct timecounter *tc);
+
+u_int hyperv_features;
+u_int hyperv_recommends;
+
+static u_int hyperv_pm_features;
+static u_int hyperv_features3;
+
+static struct timecounter hyperv_timecounter = {
+ .tc_get_timecount = hyperv_get_timecount,
+ .tc_poll_pps = NULL,
+ .tc_counter_mask = 0xffffffff,
+ .tc_frequency = HYPERV_TIMER_FREQ,
+ .tc_name = "Hyper-V",
+ .tc_quality = 2000,
+ .tc_flags = 0,
+ .tc_priv = NULL
+};
+
+static struct hypercall_ctx hypercall_context;
+
+static u_int
+hyperv_get_timecount(struct timecounter *tc __unused)
+{
+ return rdmsr(MSR_HV_TIME_REF_COUNT);
+}
+
+/**
+ * @brief Invoke the specified hypercall
+ */
+static uint64_t
+hv_vmbus_do_hypercall(uint64_t value, void *input, void *output)
+{
+ uint64_t in_paddr = 0, out_paddr = 0;
+
+ if (input != NULL)
+ in_paddr = hv_get_phys_addr(input);
+ if (output != NULL)
+ out_paddr = hv_get_phys_addr(output);
+
+ return hypercall_md(hypercall_context.hc_addr, value,
+ in_paddr, out_paddr);
+}
+
+/**
+ * @brief Post a message using the hypervisor message IPC.
+ * (This involves a hypercall.)
+ */
+hv_vmbus_status
+hv_vmbus_post_msg_via_msg_ipc(
+ hv_vmbus_connection_id connection_id,
+ hv_vmbus_msg_type message_type,
+ void* payload,
+ size_t payload_size)
+{
+ struct alignedinput {
+ uint64_t alignment8;
+ hv_vmbus_input_post_message msg;
+ };
+
+ hv_vmbus_input_post_message* aligned_msg;
+ hv_vmbus_status status;
+ size_t addr;
+
+ if (payload_size > HV_MESSAGE_PAYLOAD_BYTE_COUNT)
+ return (EMSGSIZE);
+
+ addr = (size_t) malloc(sizeof(struct alignedinput), M_DEVBUF,
+ M_ZERO | M_NOWAIT);
+ KASSERT(addr != 0,
+ ("Error VMBUS: malloc failed to allocate message buffer!"));
+ if (addr == 0)
+ return (ENOMEM);
+
+ aligned_msg = (hv_vmbus_input_post_message*)
+ (HV_ALIGN_UP(addr, HV_HYPERCALL_PARAM_ALIGN));
+
+ aligned_msg->connection_id = connection_id;
+ aligned_msg->message_type = message_type;
+ aligned_msg->payload_size = payload_size;
+ memcpy((void*) aligned_msg->payload, payload, payload_size);
+
+ status = hv_vmbus_do_hypercall(
+ HV_CALL_POST_MESSAGE, aligned_msg, 0) & 0xFFFF;
+
+ free((void *) addr, M_DEVBUF);
+ return (status);
+}
+
+/**
+ * @brief Signal an event on the specified connection using the hypervisor
+ * event IPC. (This involves a hypercall.)
+ */
+hv_vmbus_status
+hv_vmbus_signal_event(void *con_id)
+{
+ hv_vmbus_status status;
+
+ status = hv_vmbus_do_hypercall(
+ HV_CALL_SIGNAL_EVENT,
+ con_id,
+ 0) & 0xFFFF;
+
+ return (status);
+}
+
+int
+hyperv_guid2str(const struct hv_guid *guid, char *buf, size_t sz)
+{
+ const uint8_t *d = guid->data;
+
+ 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)
+{
+ u_int regs[4];
+ unsigned int maxleaf;
+
+ if (vm_guest != VM_GUEST_HV)
+ return (false);
+
+ do_cpuid(CPUID_LEAF_HV_MAXLEAF, regs);
+ maxleaf = regs[0];
+ if (maxleaf < CPUID_LEAF_HV_LIMITS)
+ return (false);
+
+ do_cpuid(CPUID_LEAF_HV_INTERFACE, regs);
+ if (regs[0] != CPUID_HV_IFACE_HYPERV)
+ return (false);
+
+ do_cpuid(CPUID_LEAF_HV_FEATURES, regs);
+ if ((regs[0] & CPUID_HV_MSR_HYPERCALL) == 0) {
+ /*
+ * Hyper-V w/o Hypercall is impossible; someone
+ * is faking Hyper-V.
+ */
+ return (false);
+ }
+ hyperv_features = regs[0];
+ hyperv_pm_features = regs[2];
+ hyperv_features3 = regs[3];
+
+ do_cpuid(CPUID_LEAF_HV_IDENTITY, regs);
+ printf("Hyper-V Version: %d.%d.%d [SP%d]\n",
+ regs[1] >> 16, regs[1] & 0xffff, regs[0], regs[2]);
+
+ printf(" Features=0x%b\n", hyperv_features,
+ "\020"
+ "\001VPRUNTIME" /* MSR_HV_VP_RUNTIME */
+ "\002TMREFCNT" /* MSR_HV_TIME_REF_COUNT */
+ "\003SYNIC" /* MSRs for SynIC */
+ "\004SYNTM" /* MSRs for SynTimer */
+ "\005APIC" /* MSR_HV_{EOI,ICR,TPR} */
+ "\006HYPERCALL" /* MSR_HV_{GUEST_OS_ID,HYPERCALL} */
+ "\007VPINDEX" /* MSR_HV_VP_INDEX */
+ "\010RESET" /* MSR_HV_RESET */
+ "\011STATS" /* MSR_HV_STATS_ */
+ "\012REFTSC" /* MSR_HV_REFERENCE_TSC */
+ "\013IDLE" /* MSR_HV_GUEST_IDLE */
+ "\014TMFREQ" /* MSR_HV_{TSC,APIC}_FREQUENCY */
+ "\015DEBUG"); /* MSR_HV_SYNTH_DEBUG_ */
+ printf(" PM Features=0x%b [C%u]\n",
+ (hyperv_pm_features & ~CPUPM_HV_CSTATE_MASK),
+ "\020"
+ "\005C3HPET", /* HPET is required for C3 state */
+ CPUPM_HV_CSTATE(hyperv_pm_features));
+ printf(" Features3=0x%b\n", hyperv_features3,
+ "\020"
+ "\001MWAIT" /* MWAIT */
+ "\002DEBUG" /* guest debug support */
+ "\003PERFMON" /* performance monitor */
+ "\004PCPUDPE" /* physical CPU dynamic partition event */
+ "\005XMMHC" /* hypercall input through XMM regs */
+ "\006IDLE" /* guest idle support */
+ "\007SLEEP" /* hypervisor sleep support */
+ "\010NUMA" /* NUMA distance query support */
+ "\011TMFREQ" /* timer frequency query (TSC, LAPIC) */
+ "\012SYNCMC" /* inject synthetic machine checks */
+ "\013CRASH" /* MSRs for guest crash */
+ "\014DEBUGMSR" /* MSRs for guest debug */
+ "\015NPIEP" /* NPIEP */
+ "\016HVDIS"); /* disabling hypervisor */
+
+ do_cpuid(CPUID_LEAF_HV_RECOMMENDS, regs);
+ hyperv_recommends = regs[0];
+ if (bootverbose)
+ printf(" Recommends: %08x %08x\n", regs[0], regs[1]);
+
+ do_cpuid(CPUID_LEAF_HV_LIMITS, regs);
+ if (bootverbose) {
+ printf(" Limits: Vcpu:%d Lcpu:%d Int:%d\n",
+ regs[0], regs[1], regs[2]);
+ }
+
+ if (maxleaf >= CPUID_LEAF_HV_HWFEATURES) {
+ do_cpuid(CPUID_LEAF_HV_HWFEATURES, regs);
+ if (bootverbose) {
+ printf(" HW Features: %08x, AMD: %08x\n",
+ regs[0], regs[3]);
+ }
+ }
+
+ return (true);
+}
+
+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);
+
+ if (hyperv_features & CPUID_HV_MSR_TIME_REFCNT) {
+ /* Register Hyper-V timecounter */
+ tc_init(&hyperv_timecounter);
+ }
+}
+SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
+ NULL);
+
+static void
+hypercall_memfree(void)
+{
+ hyperv_dmamem_free(&hypercall_context.hc_dma,
+ hypercall_context.hc_addr);
+ hypercall_context.hc_addr = NULL;
+}
+
+static void
+hypercall_create(void *arg __unused)
+{
+ uint64_t hc, hc_orig;
+
+ if (vm_guest != VM_GUEST_HV)
+ return;
+
+ hypercall_context.hc_addr = hyperv_dmamem_alloc(NULL, PAGE_SIZE, 0,
+ PAGE_SIZE, &hypercall_context.hc_dma, BUS_DMA_WAITOK);
+ if (hypercall_context.hc_addr == NULL) {
+ printf("hyperv: Hypercall page allocation failed\n");
+ /* Can't perform any Hyper-V specific actions */
+ vm_guest = VM_GUEST_VM;
+ return;
+ }
+
+ /* Get the 'reserved' bits, which requires preservation. */
+ hc_orig = rdmsr(MSR_HV_HYPERCALL);
+
+ /*
+ * Setup the Hypercall page.
+ *
+ * NOTE: 'reserved' bits MUST be preserved.
+ */
+ hc = ((hypercall_context.hc_dma.hv_paddr >> PAGE_SHIFT) <<
+ MSR_HV_HYPERCALL_PGSHIFT) |
+ (hc_orig & MSR_HV_HYPERCALL_RSVD_MASK) |
+ MSR_HV_HYPERCALL_ENABLE;
+ wrmsr(MSR_HV_HYPERCALL, hc);
+
+ /*
+ * Confirm that Hypercall page did get setup.
+ */
+ hc = rdmsr(MSR_HV_HYPERCALL);
+ if ((hc & MSR_HV_HYPERCALL_ENABLE) == 0) {
+ printf("hyperv: Hypercall setup failed\n");
+ hypercall_memfree();
+ /* Can't perform any Hyper-V specific actions */
+ vm_guest = VM_GUEST_VM;
+ 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)
+{
+ uint64_t hc;
+
+ if (hypercall_context.hc_addr == NULL)
+ return;
+
+ /* Disable Hypercall */
+ hc = rdmsr(MSR_HV_HYPERCALL);
+ wrmsr(MSR_HV_HYPERCALL, (hc & MSR_HV_HYPERCALL_RSVD_MASK));
+ 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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