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SubjectRe: [PATCH v2] entry/kvm: Make vCPU tasks exit to userspace when a livepatch is pending
Date
On Tue, May 03 2022 at 12:49, Seth Forshee wrote:
> diff --git a/include/linux/entry-kvm.h b/include/linux/entry-kvm.h
> index 6813171afccb..bf79e4cbb5a2 100644
> --- a/include/linux/entry-kvm.h
> +++ b/include/linux/entry-kvm.h
> @@ -17,8 +17,8 @@
> #endif
>
> #define XFER_TO_GUEST_MODE_WORK \
> - (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_NOTIFY_SIGNAL | \
> - _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)
> + (_TIF_NEED_RESCHED | _TIF_SIGPENDING | _TIF_PATCH_PENDING | \
> + _TIF_NOTIFY_SIGNAL | _TIF_NOTIFY_RESUME | ARCH_XFER_TO_GUEST_MODE_WORK)

as the 0-day robot has demonstrated already, this cannot compile on
architectures which do not provide _TIF_PATCH_PENDING...

Something like the below is required.

Thanks,

tglx
---
--- a/include/linux/entry-common.h
+++ b/include/linux/entry-common.h
@@ -3,6 +3,7 @@
#define __LINUX_ENTRYCOMMON_H

#include <linux/static_call_types.h>
+#include <linux/entry-defs.h>
#include <linux/ptrace.h>
#include <linux/syscalls.h>
#include <linux/seccomp.h>
@@ -11,18 +12,6 @@
#include <asm/entry-common.h>

/*
- * Define dummy _TIF work flags if not defined by the architecture or for
- * disabled functionality.
- */
-#ifndef _TIF_PATCH_PENDING
-# define _TIF_PATCH_PENDING (0)
-#endif
-
-#ifndef _TIF_UPROBE
-# define _TIF_UPROBE (0)
-#endif
-
-/*
* SYSCALL_WORK flags handled in syscall_enter_from_user_mode()
*/
#ifndef ARCH_SYSCALL_WORK_ENTER
--- /dev/null
+++ b/include/linux/entry-defs.h
@@ -0,0 +1,19 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef __LINUX_ENTRYDEFS_H
+#define __LINUX_ENTRYDEFS_H
+
+#include <linux/thread_info.h>
+
+/*
+ * Define dummy _TIF work flags if not defined by the architecture or for
+ * disabled functionality.
+ */
+#ifndef _TIF_PATCH_PENDING
+# define _TIF_PATCH_PENDING (0)
+#endif
+
+#ifndef _TIF_UPROBE
+# define _TIF_UPROBE (0)
+#endif
+
+#endif
--- a/include/linux/entry-kvm.h
+++ b/include/linux/entry-kvm.h
@@ -4,6 +4,7 @@

#include <linux/static_call_types.h>
#include <linux/resume_user_mode.h>
+#include <linux/entry-defs.h>
#include <linux/syscalls.h>
#include <linux/seccomp.h>
#include <linux/sched.h>
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