i86pc/os/xpv_platform.c

349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * CDDL HEADER START
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * The contents of this file are subject to the terms of the
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * Common Development and Distribution License (the "License").
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * You may not use this file except in compliance with the License.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * or http://www.opensolaris.org/os/licensing.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * See the License for the specific language governing permissions
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * and limitations under the License.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * When distributing Covered Code, include this CDDL HEADER in each
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * If applicable, add the following below this CDDL HEADER, with the
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * fields enclosed by brackets "[]" replaced with your own identifying
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * information: Portions Copyright [yyyy] [name of copyright owner]
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * CDDL HEADER END
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/*
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden * Copyright (c) 2009, 2010, Oracle and/or its affiliates. All rights reserved.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/types.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/archsystm.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/machsystm.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/sunndi.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/sunddi.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/ddi_subrdefs.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/xpv_support.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/xen_errno.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/hypervisor.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/gnttab.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/xenbus_comms.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/xenbus_impl.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/sysmacros.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/x86_archext.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/mman.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/stat.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/conf.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/devops.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/pc_mmu.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/cmn_err.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/cpr.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <sys/ddi.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <vm/seg_kmem.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <vm/as.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <vm/hat_pte.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#include <vm/hat_i86.h>
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic int xen_hvm_inited;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * This structure is ordinarily constructed by Xen. In the HVM world, we
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * manually fill in the few fields the PV drivers need.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic start_info_t __xen_info;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestart_info_t *xen_info = NULL;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic int xen_bits = -1;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic int xen_major = -1, xen_minor = -1;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * Feature bits; more bits will be added, like direct I/O, etc.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#define XEN_HVM_HYPERCALLS  0x0001
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#define XEN_HVM_TLBFLUSH    0x0002
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic uint64_t xen_hvm_features;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/* Metadata page shared between domain and Xen */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeeshared_info_t *HYPERVISOR_shared_info = NULL;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeepfn_t xen_shared_info_frame;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/* Page containing code to issue hypercalls.  */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeeextern caddr_t hypercall_page;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeeextern caddr_t hypercall_shared_info_page;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeestatic int
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeehvm_get_param(int param_id, uint64_t *val)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee{
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    struct xen_hvm_param xhp;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xhp.domid = DOMID_SELF;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xhp.index = param_id;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if ((HYPERVISOR_hvm_op(HVMOP_get_param, &xhp) < 0))
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return (-1);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    *val = xhp.value;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    return (0);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee}
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeevoid
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeexen_hvm_init(void)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee{
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    struct cpuid_regs cp;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    uint32_t xen_signature[4], base;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    char *xen_str;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    struct xen_add_to_physmap xatp;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_capabilities_info_t caps;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    pfn_t pfn;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    uint64_t msrval, val;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (xen_hvm_inited != 0)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_hvm_inited = 1;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * Xen's pseudo-cpuid function returns a string representing
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * the Xen signature in %ebx, %ecx, and %edx.
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * Loop over the base values, since it may be different if
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * the hypervisor has hyper-v emulation switched on.
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     *
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * %eax contains the maximum supported cpuid function.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    for (base = 0x40000000; base < 0x40010000; base += 0x100) {
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        cp.cp_eax = base;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        (void) __cpuid_insn(&cp);
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        xen_signature[0] = cp.cp_ebx;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        xen_signature[1] = cp.cp_ecx;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        xen_signature[2] = cp.cp_edx;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        xen_signature[3] = 0;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        xen_str = (char *)xen_signature;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden        if (strcmp("XenVMMXenVMM", xen_str)  == 0 &&
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden            cp.cp_eax >= (base + 2))
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden            break;
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    }
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    if (base >= 0x40010000)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * cpuid function at base + 1 returns the Xen version in %eax.  The
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * top 16 bits are the major version, the bottom 16 are the minor
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * version.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    cp.cp_eax = base + 1;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    (void) __cpuid_insn(&cp);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_major = cp.cp_eax >> 16;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_minor = cp.cp_eax & 0xffff;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * Below version 3.1 we can't do anything special as a HVM domain;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * the PV drivers don't work, many hypercalls are not available,
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * etc.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (xen_major < 3 || (xen_major == 3 && xen_minor < 1))
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden     * cpuid function at base + 2 returns information about the
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * hypercall page.  %eax nominally contains the number of pages
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * with hypercall code, but according to the Xen guys, "I'll
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * guarantee that remains one forever more, so you can just
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * allocate a single page and get quite upset if you ever see CPUID
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * return more than one page."  %ebx contains an MSR we use to ask
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * Xen to remap each page at a specific pfn.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
6e5580c92a7a7c64dd50b768bda246808fb1ee17Frank Van Der Linden    cp.cp_eax = base + 2;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    (void) __cpuid_insn(&cp);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * Let Xen know where we want the hypercall page mapped.  We
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * already have a page allocated in the .text section to simplify
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * the wrapper code.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    pfn = va_to_pfn(&hypercall_page);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    msrval = mmu_ptob(pfn);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    wrmsr(cp.cp_ebx, msrval);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /* Fill in the xen_info data */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_info = &__xen_info;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    (void) sprintf(xen_info->magic, "xen-%d.%d", xen_major, xen_minor);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (hvm_get_param(HVM_PARAM_STORE_PFN, &val) < 0)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * The first hypercall worked, so mark hypercalls as working.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_hvm_features |= XEN_HVM_HYPERCALLS;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_info->store_mfn = (mfn_t)val;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (hvm_get_param(HVM_PARAM_STORE_EVTCHN, &val) < 0)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_info->store_evtchn = (mfn_t)val;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /* Figure out whether the hypervisor is 32-bit or 64-bit.  */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if ((HYPERVISOR_xen_version(XENVER_capabilities, &caps) == 0)) {
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        ((char *)(caps))[sizeof (caps) - 1] = '\0';
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        if (strstr(caps, "x86_64") != NULL)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee            xen_bits = 64;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        else if (strstr(caps, "x86_32") != NULL)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee            xen_bits = 32;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    }
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (xen_bits < 0)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#ifdef __amd64
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    ASSERT(xen_bits == 64);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee#endif
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * Allocate space for the shared_info page and tell Xen where it
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * is.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xen_shared_info_frame = va_to_pfn(&hypercall_shared_info_page);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xatp.domid = DOMID_SELF;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xatp.idx = 0;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xatp.space = XENMAPSPACE_shared_info;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    xatp.gpfn = xen_shared_info_frame;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp) != 0)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    HYPERVISOR_shared_info = (void *)&hypercall_shared_info_page;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    /*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     * A working HVM tlb flush hypercall was introduced in Xen 3.3.
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee     */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    if (xen_major > 3 || (xen_major == 3 && xen_minor >= 3))
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        xen_hvm_features |= XEN_HVM_TLBFLUSH;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee}
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee/*
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee * Returns:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *          -1 if a feature is not available
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *          1 if a boolean feature is available
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee *          > 0 if numeric feature is available
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee */
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeeint
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybeexpv_feature(int which)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee{
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    switch (which) {
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_BITS:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return (xen_bits);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_VERSION_MAJOR:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return (xen_major);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_VERSION_MINOR:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        return (xen_minor);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_HYPERCALLS:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        if (xen_hvm_features & XEN_HVM_HYPERCALLS)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee            return (1);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        break;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_SHARED_INFO:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        if (HYPERVISOR_shared_info != NULL)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee            return (1);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        break;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    case XPVF_TLB_FLUSH:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        if (xen_hvm_features & XEN_HVM_TLBFLUSH)
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee            return (1);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        break;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    default:
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee        break;
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    }
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee    return (-1);
349b53dd4e695e3d833b5380540385145b2d3ae8Stuart Maybee}