linux-kernel - [PATCH] compat-ioctl/Xen: support at least some IOCTLs of evtchn and privcmd

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Date:   Mon, 25 Jun 2018 04:41:38 -0600
From:   "Jan Beulich" <JBeulich@...e.com>
To:     <akpm@...ux-foundation.org>,
        "Boris Ostrovsky" <boris.ostrovsky@...cle.com>,
        "Juergen Gross" <jgross@...e.com>
Cc:     "xen-devel" <xen-devel@...ts.xenproject.org>,
        <linux-kernel@...r.kernel.org>
Subject: [PATCH] compat-ioctl/Xen: support at least some IOCTLs of
 evtchn and privcmd

While this is only a start (IOCTL_PRIVCMD_MMAP* and IOCTL_PRIVCMD_DM_OP
require more work), it at least allows some simple operations (like
"xl dmesg") which have always been available on XenoLinux to work again
with a 64-bit kernel underneath a 32-bit distro.

Signed-off-by: Jan Beulich <jbeulich@...e.com>
---
 fs/compat_ioctl.c |   17 +++++++++++++++++
 1 file changed, 17 insertions(+)

--- 4.18-rc2/fs/compat_ioctl.c
+++ 4.18-rc2-xen-privcmd-compat-ioctls/fs/compat_ioctl.c
@@ -115,6 +115,12 @@
 #include <asm/fbio.h>
 #endif
 
+#ifdef CONFIG_XEN
+#include <xen/interface/xen.h>
+#include <xen/evtchn.h>
+#include <xen/privcmd.h>
+#endif
+
 #define convert_in_user(srcptr, dstptr)			\
 ({							\
 	typeof(*srcptr) val;				\
@@ -1300,6 +1306,17 @@ IGNORE_IOCTL(FBIOGETCMAP32)
 IGNORE_IOCTL(FBIOSCURSOR32)
 IGNORE_IOCTL(FBIOGCURSOR32)
 #endif
+
+#ifdef CONFIG_XEN
+COMPATIBLE_IOCTL(IOCTL_PRIVCMD_HYPERCALL)
+COMPATIBLE_IOCTL(IOCTL_PRIVCMD_RESTRICT)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_BIND_VIRQ)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_BIND_INTERDOMAIN)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_BIND_UNBOUND_PORT)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_UNBIND)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_NOTIFY)
+COMPATIBLE_IOCTL(IOCTL_EVTCHN_RESET)
+#endif
 };
 
 /*