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Index: sys/conf/files
===================================================================
--- sys/conf/files
+++ sys/conf/files
@@ -5152,6 +5152,7 @@
vm/vm_swapout_dummy.c optional NO_SWAPPING
vm/vm_unix.c standard
vm/vnode_pager.c standard
+xen/common.c optional xenhvm
xen/features.c optional xenhvm
xen/xenbus/xenbus_if.m optional xenhvm
xen/xenbus/xenbus.c optional xenhvm
Index: sys/x86/xen/hvm.c
===================================================================
--- sys/x86/xen/hvm.c
+++ sys/x86/xen/hvm.c
@@ -66,8 +66,6 @@
static void xen_hvm_cpu_init(void);
/*-------------------------------- Global Data -------------------------------*/
-enum xen_domain_type xen_domain_type = XEN_NATIVE;
-
#ifdef SMP
struct cpu_ops xen_hvm_cpu_ops = {
.cpu_init = xen_hvm_cpu_init,
@@ -83,12 +81,6 @@
*/
int xen_vector_callback_enabled;
-/**
- * Start info flags. ATM this only used to store the initial domain flag for
- * PVHv2, and it's always empty for HVM guests.
- */
-uint32_t hvm_start_flags;
-
/**
* Signal whether the vector injected for the event channel upcall requires to
* be EOI'ed on the local APIC.
@@ -99,9 +91,6 @@
DPCPU_DEFINE(struct vcpu_info, vcpu_local_info);
DPCPU_DEFINE(struct vcpu_info *, vcpu_info);
-/*------------------ Hypervisor Access Shared Memory Regions -----------------*/
-shared_info_t *HYPERVISOR_shared_info;
-
/*------------------------------ Sysctl tunables -----------------------------*/
int xen_disable_pv_disks = 0;
int xen_disable_pv_nics = 0;
@@ -203,33 +192,6 @@
return (0);
}
-static void
-xen_hvm_init_shared_info_page(void)
-{
- struct xen_add_to_physmap xatp;
-
- if (xen_pv_domain()) {
- /*
- * Already setup in the PV case, shared_info is passed inside
- * of the start_info struct at start of day.
- */
- return;
- }
-
- if (HYPERVISOR_shared_info == NULL) {
- HYPERVISOR_shared_info = malloc(PAGE_SIZE, M_XENHVM, M_NOWAIT);
- if (HYPERVISOR_shared_info == NULL)
- panic("Unable to allocate Xen shared info page");
- }
-
- xatp.domid = DOMID_SELF;
- xatp.idx = 0;
- xatp.space = XENMAPSPACE_shared_info;
- xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT;
- if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
- panic("HYPERVISOR_memory_op failed");
-}
-
static int
set_percpu_callback(unsigned int vcpu)
{
@@ -397,7 +359,7 @@
* is passed inside the start_info struct and is already set, so this
* functions are no-ops.
*/
- xen_hvm_init_shared_info_page();
+ xen_handle_shared_info();
xen_hvm_disable_emulated_devices();
}
Index: sys/xen/common.c
===================================================================
--- /dev/null
+++ sys/xen/common.c
@@ -0,0 +1,89 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause-FreeBSD
+ *
+ * Copyright (c) 2021 Elliott Mitchell
+ * Copyright (c) 2014 Julien Grall
+ * 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, 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 AND CONTRIBUTORS ``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 OR CONTRIBUTORS 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.
+ */
+
+#include <sys/param.h> /* required by xen/xen-os.h */
+#include <sys/kernel.h>
+
+#include <vm/vm.h>
+#include <vm/vm_page.h>
+
+#include <machine/atomic.h> /* required by xen/xen-os.h */
+
+#include <xen/xen-os.h>
+#include <xen/hvm.h>
+
+#include <xen/interface/event_channel.h>
+#include <xen/interface/hvm/params.h>
+
+/*-------------------------------- Global Data -------------------------------*/
+enum xen_domain_type xen_domain_type = XEN_NATIVE;
+
+/**
+ * Start info flags. ATM this only used to store the initial domain flag for
+ * PVHv2, and it's always empty for HVM guests.
+ */
+uint32_t hvm_start_flags;
+
+/*------------------ Hypervisor Access Shared Memory Regions -----------------*/
+shared_info_t *HYPERVISOR_shared_info = NULL;
+
+void
+xen_handle_shared_info(void)
+{
+ struct xen_add_to_physmap xatp;
+ vm_page_t shared_info;
+
+ /*
+ * Already setup in the PV case, shared_info is passed inside of the
+ * start_info struct at start of day. Also, don't try to initialize if
+ * not running on Xen.
+ */
+ if (!xen_hvm_domain())
+ return;
+
+ /*
+ * We expect to be called multiple times, the shared info page needs
+ * to be re-registered on resume.
+ */
+ if (HYPERVISOR_shared_info == NULL) {
+ shared_info = vm_page_alloc_noobj(VM_ALLOC_ZERO);
+ if (shared_info == NULL)
+ panic("Unable to allocate Xen shared info page\n");
+ HYPERVISOR_shared_info = pmap_mapdev_attr(
+ VM_PAGE_TO_PHYS(shared_info), PAGE_SIZE, VM_MEMATTR_XEN);
+
+ }
+
+ xatp.domid = DOMID_SELF;
+ xatp.idx = 0;
+ xatp.space = XENMAPSPACE_shared_info;
+ xatp.gpfn = vtophys(HYPERVISOR_shared_info) >> PAGE_SHIFT;
+ if (HYPERVISOR_memory_op(XENMEM_add_to_physmap, &xatp))
+ panic("Unable to map shared info\n");
+}
Index: sys/xen/hvm.h
===================================================================
--- sys/xen/hvm.h
+++ sys/xen/hvm.h
@@ -102,6 +102,7 @@
void xen_hvm_set_callback(device_t);
void xen_hvm_suspend(void);
void xen_hvm_resume(bool suspend_cancelled);
+void xen_handle_shared_info(void);
extern uint32_t hvm_start_flags;
extern bool xen_evtchn_needs_ack;

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