git: b62373d46a05 - stable/14 - LinuxKPI: Add xen/xen.h header

The branch stable/14 has been updated by wulf:

URL: https://cgit.FreeBSD.org/src/commit/?id=b62373d46a0572a549b02a2a14956954957c5ee5

commit b62373d46a0572a549b02a2a14956954957c5ee5
Author:     Vladimir Kondratyev <wulf@FreeBSD.org>
AuthorDate: 2023-12-24 08:19:58 +0000
Commit:     Vladimir Kondratyev <wulf@FreeBSD.org>
CommitDate: 2024-02-17 20:58:37 +0000

    LinuxKPI: Add xen/xen.h header
    
    It contains proxy-implementation of xen_initial_domain() and
    xen_pv_domain() required by latest drm-kmod.
    
    Sponsored by:   Serenity Cyber Security, LLC
    Reviewed by:    manu, bz
    MFC after:      1 week
    Differential Revision:  https://reviews.freebsd.org/D42797
    
    (cherry picked from commit c612e3c262db6c8256159c4ed39018788017c7e2)
---
 sys/compat/linuxkpi/common/include/xen/xen.h  | 37 +++++++++++++++++++++++++++
 sys/compat/linuxkpi/common/src/linux_compat.c | 30 ++++++++++++++++++++++
 2 files changed, 67 insertions(+)

diff --git a/sys/compat/linuxkpi/common/include/xen/xen.h b/sys/compat/linuxkpi/common/include/xen/xen.h
new file mode 100644
index 000000000000..16e77724111d
--- /dev/null
+++ b/sys/compat/linuxkpi/common/include/xen/xen.h
@@ -0,0 +1,37 @@
+/*-
+ * SPDX-License-Identifier: BSD-2-Clause
+ *
+ * Copyright (c) 2023 Serenity Cyber Security, LLC.
+ *
+ * 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.
+ */
+
+#ifndef _LINUXKPI_XEN_XEN_H_
+#define	_LINUXKPI_XEN_XEN_H_
+
+#define xen_initial_domain()	lkpi_xen_initial_domain()
+#define	xen_pv_domain()		lkpi_xen_pv_domain()
+
+bool lkpi_xen_initial_domain(void);
+bool lkpi_xen_pv_domain(void);
+
+#endif /* _LINUXKPI_XEN_XEN_H_ */
diff --git a/sys/compat/linuxkpi/common/src/linux_compat.c b/sys/compat/linuxkpi/common/src/linux_compat.c
index 59ab61a86ec7..b076a66ded77 100644
--- a/sys/compat/linuxkpi/common/src/linux_compat.c
+++ b/sys/compat/linuxkpi/common/src/linux_compat.c
@@ -28,6 +28,7 @@
  */
 
 #include <sys/cdefs.h>
+#include "opt_global.h"
 #include "opt_stack.h"
 
 #include <sys/param.h>
@@ -99,6 +100,15 @@
 #include <asm/processor.h>
 #endif
 
+#include <xen/xen.h>
+#ifdef XENHVM
+#undef xen_pv_domain
+#undef xen_initial_domain
+/* xen/xen-os.h redefines __must_check */
+#undef __must_check
+#include <xen/xen-os.h>
+#endif
+
 SYSCTL_NODE(_compat, OID_AUTO, linuxkpi, CTLFLAG_RW | CTLFLAG_MPSAFE, 0,
     "LinuxKPI parameters");
 
@@ -2596,6 +2606,26 @@ lkpi_get_static_single_cpu_mask(int cpuid)
 	return (&static_single_cpu_mask[cpuid]);
 }
 
+bool
+lkpi_xen_initial_domain(void)
+{
+#ifdef XENHVM
+	return (xen_initial_domain());
+#else
+	return (false);
+#endif
+}
+
+bool
+lkpi_xen_pv_domain(void)
+{
+#ifdef XENHVM
+	return (xen_pv_domain());
+#else
+	return (false);
+#endif
+}
+
 static void
 linux_compat_init(void *arg)
 {