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7ece5993b7
Currently FreeBSD uses IPI based TLB flushing for remote TLB flushing. Hyper-V allows hypercalls to flush local and remote TLB. The use of Hyper-V hypercalls gives significant performance improvement in TLB operations. This patch set during test has shown near to 40 percent TLB performance improvement. Also this patch adds rep hypercall implementation as well. Reviewed by: whu, kib Tested by: whu Authored-by: Souradeep Chakrabarti <schakrabarti@microsoft.com> Co-Authored-by: Erni Sri Satya Vennela <ernis@microsoft.com> MFC after: 1 week Sponsored by: Microsoft Differential Revision: https://reviews.freebsd.org/D45521 (cherry picked from commit 2b887687edc25bb4553f0d8a1183f454a85d413d)
236 lines
6.6 KiB
C
236 lines
6.6 KiB
C
/*-
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* Copyright (c) 2009-2012,2016-2017 Microsoft Corp.
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* Copyright (c) 2012 NetApp Inc.
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* Copyright (c) 2012 Citrix Inc.
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice unmodified, this list of conditions, and the following
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* disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
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* IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
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* OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
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* IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
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* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
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* NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
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* DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
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* THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
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* (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
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* THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
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*/
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/**
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* Implements low-level interactions with Hyper-V/Azure
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*/
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#include <sys/cdefs.h>
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/systm.h>
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#include <sys/timetc.h>
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#include <sys/cpuset.h>
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#include <vm/vm.h>
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#include <vm/vm_extern.h>
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#include <vm/vm_kern.h>
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#include <vm/pmap.h>
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#include <dev/hyperv/include/hyperv.h>
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#include <dev/hyperv/include/hyperv_busdma.h>
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#if defined(__aarch64__)
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#include <dev/hyperv/vmbus/aarch64/hyperv_machdep.h>
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#include <dev/hyperv/vmbus/aarch64/hyperv_reg.h>
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#else
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#include <dev/hyperv/vmbus/x86/hyperv_machdep.h>
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#include <dev/hyperv/vmbus/x86/hyperv_reg.h>
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#endif
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#include <dev/hyperv/vmbus/vmbus_var.h>
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#include <dev/hyperv/vmbus/hyperv_common_reg.h>
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#include <dev/hyperv/vmbus/hyperv_var.h>
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#define HYPERV_FREEBSD_BUILD 0ULL
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#define HYPERV_FREEBSD_VERSION ((uint64_t)__FreeBSD_version)
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#define HYPERV_FREEBSD_OSID 0ULL
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#define MSR_HV_GUESTID_BUILD_FREEBSD \
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(HYPERV_FREEBSD_BUILD & MSR_HV_GUESTID_BUILD_MASK)
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#define MSR_HV_GUESTID_VERSION_FREEBSD \
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((HYPERV_FREEBSD_VERSION << MSR_HV_GUESTID_VERSION_SHIFT) & \
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MSR_HV_GUESTID_VERSION_MASK)
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#define MSR_HV_GUESTID_OSID_FREEBSD \
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((HYPERV_FREEBSD_OSID << MSR_HV_GUESTID_OSID_SHIFT) & \
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MSR_HV_GUESTID_OSID_MASK)
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#define MSR_HV_GUESTID_FREEBSD \
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(MSR_HV_GUESTID_BUILD_FREEBSD | \
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MSR_HV_GUESTID_VERSION_FREEBSD | \
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MSR_HV_GUESTID_OSID_FREEBSD | \
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MSR_HV_GUESTID_OSTYPE_FREEBSD)
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static bool hyperv_identify(void);
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static void hypercall_memfree(void);
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static struct hypercall_ctx hypercall_context;
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uint64_t
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hypercall_post_message(bus_addr_t msg_paddr)
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{
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return hypercall_md(hypercall_context.hc_addr,
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HYPERCALL_POST_MESSAGE, msg_paddr, 0);
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}
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uint64_t
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hypercall_signal_event(bus_addr_t monprm_paddr)
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{
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return hypercall_md(hypercall_context.hc_addr,
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HYPERCALL_SIGNAL_EVENT, monprm_paddr, 0);
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}
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static inline int hv_result(uint64_t status)
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{
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return status & HV_HYPERCALL_RESULT_MASK;
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}
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static inline bool hv_result_success(uint64_t status)
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{
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return hv_result(status) == HV_STATUS_SUCCESS;
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}
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static inline unsigned int hv_repcomp(uint64_t status)
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{
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/* Bits [43:32] of status have 'Reps completed' data. */
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return ((status & HV_HYPERCALL_REP_COMP_MASK) >>
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HV_HYPERCALL_REP_COMP_OFFSET);
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}
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/*
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* Rep hypercalls. Callers of this functions are supposed to ensure that
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* rep_count and varhead_size comply with Hyper-V hypercall definition.
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*/
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uint64_t
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hv_do_rep_hypercall(uint16_t code, uint16_t rep_count, uint16_t varhead_size,
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uint64_t input, uint64_t output)
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{
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uint64_t control = code;
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uint64_t status;
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uint16_t rep_comp;
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control |= (uint64_t)varhead_size << HV_HYPERCALL_VARHEAD_OFFSET;
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control |= (uint64_t)rep_count << HV_HYPERCALL_REP_COMP_OFFSET;
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do {
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status = hypercall_do_md(control, input, output);
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if (!hv_result_success(status))
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return status;
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rep_comp = hv_repcomp(status);
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control &= ~HV_HYPERCALL_REP_START_MASK;
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control |= (uint64_t)rep_comp << HV_HYPERCALL_REP_START_OFFSET;
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} while (rep_comp < rep_count);
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if (hv_result_success(status))
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return HV_STATUS_SUCCESS;
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return status;
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}
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uint64_t
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hypercall_do_md(uint64_t input_val, uint64_t input_addr, uint64_t out_addr)
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{
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uint64_t phys_inaddr, phys_outaddr;
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phys_inaddr = input_addr ? vtophys(input_addr) : 0;
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phys_outaddr = out_addr ? vtophys(out_addr) : 0;
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return hypercall_md(hypercall_context.hc_addr,
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input_val, phys_inaddr, phys_outaddr);
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}
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int
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hyperv_guid2str(const struct hyperv_guid *guid, char *buf, size_t sz)
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{
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const uint8_t *d = guid->hv_guid;
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return snprintf(buf, sz, "%02x%02x%02x%02x-"
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"%02x%02x-%02x%02x-%02x%02x-"
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"%02x%02x%02x%02x%02x%02x",
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d[3], d[2], d[1], d[0],
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d[5], d[4], d[7], d[6], d[8], d[9],
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d[10], d[11], d[12], d[13], d[14], d[15]);
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}
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static bool
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hyperv_identify(void)
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{
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return(hyperv_identify_features());
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}
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static void
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hyperv_init(void *dummy __unused)
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{
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if (!hyperv_identify()) {
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/* Not Hyper-V; reset guest id to the generic one. */
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if (vm_guest == VM_GUEST_HV)
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vm_guest = VM_GUEST_VM;
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return;
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}
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/* Set guest id */
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WRMSR(MSR_HV_GUEST_OS_ID, MSR_HV_GUESTID_FREEBSD);
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hyperv_init_tc();
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}
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SYSINIT(hyperv_initialize, SI_SUB_HYPERVISOR, SI_ORDER_FIRST, hyperv_init,
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NULL);
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static void
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hypercall_memfree(void)
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{
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kmem_free(hypercall_context.hc_addr, PAGE_SIZE);
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hypercall_context.hc_addr = NULL;
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}
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static void
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hypercall_create(void *arg __unused)
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{
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int ret;
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if (vm_guest != VM_GUEST_HV)
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return;
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/*
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* NOTE:
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* - busdma(9), i.e. hyperv_dmamem APIs, can _not_ be used due to
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* the NX bit.
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* - Assume kmem_malloc() returns properly aligned memory.
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*/
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hypercall_context.hc_addr = kmem_malloc(PAGE_SIZE, M_EXEC | M_WAITOK);
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hypercall_context.hc_paddr = vtophys(hypercall_context.hc_addr);
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ret = hypercall_page_setup(hypercall_context.hc_paddr);
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if (ret) {
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hypercall_memfree();
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return;
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}
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if (bootverbose)
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printf("hyperv: Hypercall created\n");
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}
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SYSINIT(hypercall_ctor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_create, NULL);
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static void
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hypercall_destroy(void *arg __unused)
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{
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if (hypercall_context.hc_addr == NULL)
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return;
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hypercall_disable();
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hypercall_memfree();
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if (bootverbose)
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printf("hyperv: Hypercall destroyed\n");
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}
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SYSUNINIT(hypercall_dtor, SI_SUB_DRIVERS, SI_ORDER_FIRST, hypercall_destroy,
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NULL);
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