diff options
Diffstat (limited to 'sys/dev/hyperv/vmbus/hyperv.c')
| -rw-r--r-- | sys/dev/hyperv/vmbus/hyperv.c | 340 |
1 files changed, 340 insertions, 0 deletions
diff --git a/sys/dev/hyperv/vmbus/hyperv.c b/sys/dev/hyperv/vmbus/hyperv.c new file mode 100644 index 000000000000..01e0ad9610d9 --- /dev/null +++ b/sys/dev/hyperv/vmbus/hyperv.c @@ -0,0 +1,340 @@ +/*- + * 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/cdefs.h> +__FBSDID("$FreeBSD$"); + +#include <sys/param.h> +#include <sys/kernel.h> +#include <sys/malloc.h> +#include <sys/systm.h> +#include <sys/timetc.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> +#include <dev/hyperv/vmbus/hyperv_machdep.h> +#include <dev/hyperv/vmbus/hyperv_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) + +struct hypercall_ctx { + void *hc_addr; + vm_paddr_t hc_paddr; +}; + +static u_int hyperv_get_timecount(struct timecounter *); +static bool hyperv_identify(void); +static void hypercall_memfree(void); + +u_int hyperv_ver_major; + +u_int hyperv_features; +u_int hyperv_recommends; + +static u_int hyperv_pm_features; +static u_int hyperv_features3; + +hyperv_tc64_t hyperv_tc64; + +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); +} + +static uint64_t +hyperv_tc64_rdmsr(void) +{ + + return (rdmsr(MSR_HV_TIME_REF_COUNT)); +} + +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); +} + +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) +{ + 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); + hyperv_ver_major = regs[1] >> 16; + printf("Hyper-V Version: %d.%d.%d [SP%d]\n", + hyperv_ver_major, 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. This should be done as early + * as possible to let DELAY() work, since the 8254 PIT is not + * reliably emulated or even available. + */ + tc_init(&hyperv_timecounter); + + /* + * Install 64 bits timecounter method for other modules + * to use. + */ + hyperv_tc64 = hyperv_tc64_rdmsr; + } +} +SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init, + NULL); + +static void +hypercall_memfree(void) +{ + kmem_free((vm_offset_t)hypercall_context.hc_addr, PAGE_SIZE); + hypercall_context.hc_addr = NULL; +} + +static void +hypercall_create(void *arg __unused) +{ + uint64_t hc, hc_orig; + + 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 = (void *)kmem_malloc(PAGE_SIZE, M_EXEC | + M_WAITOK); + hypercall_context.hc_paddr = vtophys(hypercall_context.hc_addr); + + /* 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_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); |