362 lines
8.9 KiB
C
362 lines
8.9 KiB
C
/*
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* Copyright (c) 2014 Roger Pau Monné <roger.pau@citrix.com>
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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, this list of conditions and the following 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 AND CONTRIBUTORS AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/bus.h>
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#include <sys/kernel.h>
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#include <sys/malloc.h>
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#include <sys/proc.h>
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#include <sys/smp.h>
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#include <sys/systm.h>
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#include <vm/vm.h>
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#include <vm/pmap.h>
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#include <machine/cpufunc.h>
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#include <machine/cpu.h>
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#include <machine/intr_machdep.h>
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#include <machine/md_var.h>
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#include <machine/smp.h>
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#include <x86/apicreg.h>
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#include <x86/apicvar.h>
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#include <xen/xen-os.h>
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#include <xen/features.h>
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#include <xen/gnttab.h>
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#include <xen/hypervisor.h>
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#include <xen/hvm.h>
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#include <xen/xen_intr.h>
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#include <contrib/xen/arch-x86/cpuid.h>
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#include <contrib/xen/vcpu.h>
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/*--------------------------- Forward Declarations ---------------------------*/
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static driver_filter_t xen_smp_rendezvous_action;
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#ifdef __amd64__
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static driver_filter_t xen_invlop;
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#else
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static driver_filter_t xen_invltlb;
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static driver_filter_t xen_invlpg;
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static driver_filter_t xen_invlrng;
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static driver_filter_t xen_invlcache;
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#endif
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static driver_filter_t xen_ipi_bitmap_handler;
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static driver_filter_t xen_cpustop_handler;
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static driver_filter_t xen_cpususpend_handler;
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static driver_filter_t xen_ipi_swi_handler;
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/*---------------------------------- Macros ----------------------------------*/
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#define IPI_TO_IDX(ipi) ((ipi) - APIC_IPI_INTS)
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/*--------------------------------- Xen IPIs ---------------------------------*/
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struct xen_ipi_handler
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{
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driver_filter_t *filter;
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const char *description;
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};
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static struct xen_ipi_handler xen_ipis[] =
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{
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[IPI_TO_IDX(IPI_RENDEZVOUS)] = { xen_smp_rendezvous_action, "r" },
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#ifdef __amd64__
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[IPI_TO_IDX(IPI_INVLOP)] = { xen_invlop, "itlb"},
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#else
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[IPI_TO_IDX(IPI_INVLTLB)] = { xen_invltlb, "itlb"},
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[IPI_TO_IDX(IPI_INVLPG)] = { xen_invlpg, "ipg" },
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[IPI_TO_IDX(IPI_INVLRNG)] = { xen_invlrng, "irg" },
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[IPI_TO_IDX(IPI_INVLCACHE)] = { xen_invlcache, "ic" },
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#endif
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[IPI_TO_IDX(IPI_BITMAP_VECTOR)] = { xen_ipi_bitmap_handler, "b" },
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[IPI_TO_IDX(IPI_STOP)] = { xen_cpustop_handler, "st" },
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[IPI_TO_IDX(IPI_SUSPEND)] = { xen_cpususpend_handler, "sp" },
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[IPI_TO_IDX(IPI_SWI)] = { xen_ipi_swi_handler, "sw" },
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};
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/*
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* Save previous (native) handler as a fallback. Xen < 4.7 doesn't support
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* VCPUOP_send_nmi for HVM guests, and thus we need a fallback in that case:
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*
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* https://lists.freebsd.org/archives/freebsd-xen/2022-January/000032.html
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*/
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void (*native_ipi_vectored)(u_int, int);
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/*------------------------------- Per-CPU Data -------------------------------*/
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DPCPU_DEFINE(xen_intr_handle_t, ipi_handle[nitems(xen_ipis)]);
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/*------------------------------- Xen PV APIC --------------------------------*/
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#define PCPU_ID_GET(id, field) (pcpu_find(id)->pc_##field)
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static int
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send_nmi(int dest)
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{
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unsigned int cpu;
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int rc = 0;
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/*
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* NMIs are not routed over event channels, and instead delivered as on
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* native using the exception vector (#2). Triggering them can be done
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* using the local APIC, or an hypercall as a shortcut like it's done
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* below.
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*/
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switch(dest) {
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case APIC_IPI_DEST_SELF:
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rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi, PCPU_GET(vcpu_id), NULL);
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break;
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case APIC_IPI_DEST_ALL:
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CPU_FOREACH(cpu) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
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PCPU_ID_GET(cpu, vcpu_id), NULL);
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if (rc != 0)
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break;
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}
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break;
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case APIC_IPI_DEST_OTHERS:
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CPU_FOREACH(cpu) {
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if (cpu != PCPU_GET(cpuid)) {
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rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
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PCPU_ID_GET(cpu, vcpu_id), NULL);
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if (rc != 0)
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break;
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}
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}
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break;
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default:
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rc = HYPERVISOR_vcpu_op(VCPUOP_send_nmi,
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PCPU_ID_GET(apic_cpuid(dest), vcpu_id), NULL);
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break;
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}
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return rc;
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}
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#undef PCPU_ID_GET
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static void
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xen_pv_lapic_ipi_vectored(u_int vector, int dest)
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{
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xen_intr_handle_t *ipi_handle;
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int ipi_idx, to_cpu, self;
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static bool pvnmi = true;
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if (vector >= IPI_NMI_FIRST) {
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if (pvnmi) {
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int rc = send_nmi(dest);
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if (rc != 0) {
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printf(
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"Sending NMI using hypercall failed (%d) switching to APIC\n", rc);
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pvnmi = false;
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native_ipi_vectored(vector, dest);
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}
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} else
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native_ipi_vectored(vector, dest);
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return;
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}
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ipi_idx = IPI_TO_IDX(vector);
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if (ipi_idx >= nitems(xen_ipis))
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panic("IPI out of range");
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switch(dest) {
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case APIC_IPI_DEST_SELF:
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ipi_handle = DPCPU_GET(ipi_handle);
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xen_intr_signal(ipi_handle[ipi_idx]);
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break;
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case APIC_IPI_DEST_ALL:
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CPU_FOREACH(to_cpu) {
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ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
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xen_intr_signal(ipi_handle[ipi_idx]);
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}
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break;
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case APIC_IPI_DEST_OTHERS:
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self = PCPU_GET(cpuid);
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CPU_FOREACH(to_cpu) {
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if (to_cpu != self) {
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ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
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xen_intr_signal(ipi_handle[ipi_idx]);
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}
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}
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break;
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default:
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to_cpu = apic_cpuid(dest);
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ipi_handle = DPCPU_ID_GET(to_cpu, ipi_handle);
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xen_intr_signal(ipi_handle[ipi_idx]);
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break;
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}
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}
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/*---------------------------- XEN PV IPI Handlers ---------------------------*/
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/*
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* These are C clones of the ASM functions found in apic_vector.
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*/
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static int
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xen_ipi_bitmap_handler(void *arg)
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{
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ipi_bitmap_handler(*curthread->td_intr_frame);
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return (FILTER_HANDLED);
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}
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static int
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xen_smp_rendezvous_action(void *arg)
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{
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#ifdef COUNT_IPIS
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(*ipi_rendezvous_counts[PCPU_GET(cpuid)])++;
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#endif /* COUNT_IPIS */
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smp_rendezvous_action();
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return (FILTER_HANDLED);
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}
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#ifdef __amd64__
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static int
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xen_invlop(void *arg)
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{
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invlop_handler();
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return (FILTER_HANDLED);
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}
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#else /* __i386__ */
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static int
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xen_invltlb(void *arg)
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{
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invltlb_handler();
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return (FILTER_HANDLED);
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}
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static int
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xen_invlpg(void *arg)
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{
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invlpg_handler();
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return (FILTER_HANDLED);
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}
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static int
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xen_invlrng(void *arg)
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{
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invlrng_handler();
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return (FILTER_HANDLED);
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}
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static int
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xen_invlcache(void *arg)
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{
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invlcache_handler();
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return (FILTER_HANDLED);
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}
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#endif /* __amd64__ */
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static int
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xen_cpustop_handler(void *arg)
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{
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cpustop_handler();
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return (FILTER_HANDLED);
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}
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static int
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xen_cpususpend_handler(void *arg)
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{
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cpususpend_handler();
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return (FILTER_HANDLED);
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}
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static int
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xen_ipi_swi_handler(void *arg)
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{
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ipi_swi_handler(*curthread->td_intr_frame);
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return (FILTER_HANDLED);
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}
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/*----------------------------- XEN PV IPI setup -----------------------------*/
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/*
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* Those functions are provided outside of the Xen PV APIC implementation
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* so PVHVM guests can also use PV IPIs without having an actual Xen PV APIC,
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* because on PVHVM there's an emulated LAPIC provided by Xen.
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*/
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static void
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xen_cpu_ipi_init(int cpu)
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{
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xen_intr_handle_t *ipi_handle;
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const struct xen_ipi_handler *ipi;
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int idx, rc;
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ipi_handle = DPCPU_ID_GET(cpu, ipi_handle);
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for (ipi = xen_ipis, idx = 0; idx < nitems(xen_ipis); ipi++, idx++) {
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if (ipi->filter == NULL) {
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ipi_handle[idx] = NULL;
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continue;
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}
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rc = xen_intr_alloc_and_bind_ipi(cpu, ipi->filter,
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INTR_TYPE_TTY, &ipi_handle[idx]);
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if (rc != 0)
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panic("Unable to allocate a XEN IPI port");
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xen_intr_describe(ipi_handle[idx], "%s", ipi->description);
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}
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}
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static void
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xen_setup_cpus(void)
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{
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uint32_t regs[4];
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int i;
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if (!xen_vector_callback_enabled)
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return;
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/*
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* Check whether the APIC virtualization is hardware assisted, as
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* that's faster than using event channels because it avoids the VM
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* exit.
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*/
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KASSERT(hv_base != 0, ("Invalid base Xen CPUID leaf"));
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cpuid_count(hv_base + 4, 0, regs);
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if ((x2apic_mode && (regs[0] & XEN_HVM_CPUID_X2APIC_VIRT)) ||
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(!x2apic_mode && (regs[0] & XEN_HVM_CPUID_APIC_ACCESS_VIRT)))
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return;
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CPU_FOREACH(i)
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xen_cpu_ipi_init(i);
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/* Set the xen pv ipi ops to replace the native ones */
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ipi_vectored = xen_pv_lapic_ipi_vectored;
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native_ipi_vectored = ipi_vectored;
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}
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/* Switch to using PV IPIs as soon as the vcpu_id is set. */
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SYSINIT(xen_setup_cpus, SI_SUB_SMP, SI_ORDER_SECOND, xen_setup_cpus, NULL);
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