[PATCH bpf] bpf: powerpc: fix broken uapi for BPF_PROG_TYPE_PERF_EVENT

Now that there are different variants of pt_regs for userspace and
kernel, the uapi for the BPF_PROG_TYPE_PERF_EVENT program type must
be changed by exporting the user_pt_regs structure instead of the
pt_regs structure that is in-kernel only.

Fixes: 002af9391bfb ("powerpc: Split user/kernel definitions of struct pt_regs")
Signed-off-by: Sandipan Das <redacted>
---
 arch/powerpc/include/asm/perf_event.h          | 2 ++
 arch/powerpc/include/uapi/asm/Kbuild           | 1 -
 arch/powerpc/include/uapi/asm/bpf_perf_event.h | 9 +++++++++
 3 files changed, 11 insertions(+), 1 deletion(-)
 create mode 100644 arch/powerpc/include/uapi/asm/bpf_perf_event.h

diff --git a/arch/powerpc/include/asm/perf_event.h b/arch/powerpc/include/asm/perf_event.h
index 8bf1b6351716..16a49819da9a 100644
--- a/arch/powerpc/include/asm/perf_event.h
+++ b/arch/powerpc/include/asm/perf_event.h

@@ -26,6 +26,8 @@
 #include <asm/ptrace.h>
 #include <asm/reg.h>
 
+#define perf_arch_bpf_user_pt_regs(regs) &regs->user_regs
+
 /*
  * Overload regs->result to specify whether we should use the MSR (result
  * is zero) or the SIAR (result is non zero).

diff --git a/arch/powerpc/include/uapi/asm/Kbuild b/arch/powerpc/include/uapi/asm/Kbuild
index a658091a19f9..3712152206f3 100644
--- a/arch/powerpc/include/uapi/asm/Kbuild
+++ b/arch/powerpc/include/uapi/asm/Kbuild

@@ -1,7 +1,6 @@
 # UAPI Header export list
 include include/uapi/asm-generic/Kbuild.asm
 
-generic-y += bpf_perf_event.h
 generic-y += param.h
 generic-y += poll.h
 generic-y += resource.h

diff --git a/arch/powerpc/include/uapi/asm/bpf_perf_event.h b/arch/powerpc/include/uapi/asm/bpf_perf_event.h
new file mode 100644
index 000000000000..b551b741653d
--- /dev/null
+++ b/arch/powerpc/include/uapi/asm/bpf_perf_event.h

@@ -0,0 +1,9 @@
+/* SPDX-License-Identifier: GPL-2.0 */
+#ifndef _UAPI__ASM_BPF_PERF_EVENT_H__
+#define _UAPI__ASM_BPF_PERF_EVENT_H__
+
+#include <asm/ptrace.h>
+
+typedef struct user_pt_regs bpf_user_pt_regs_t;
+
+#endif /* _UAPI__ASM_BPF_PERF_EVENT_H__ */

-- 
2.19.2

On Thu, Dec 06, 2018 at 02:57:01PM +0530, Sandipan Das wrote:

Now that there are different variants of pt_regs for userspace and
kernel, the uapi for the BPF_PROG_TYPE_PERF_EVENT program type must
be changed by exporting the user_pt_regs structure instead of the
pt_regs structure that is in-kernel only.

Fixes: 002af9391bfb ("powerpc: Split user/kernel definitions of struct pt_regs")
Signed-off-by: Sandipan Das <redacted>

Thanks! Applied to bpf tree.

Alexei Starovoitov [off-list ref] writes:

On Thu, Dec 06, 2018 at 02:57:01PM +0530, Sandipan Das wrote:

quoted

Now that there are different variants of pt_regs for userspace and
kernel, the uapi for the BPF_PROG_TYPE_PERF_EVENT program type must
be changed by exporting the user_pt_regs structure instead of the
pt_regs structure that is in-kernel only.

Fixes: 002af9391bfb ("powerpc: Split user/kernel definitions of struct pt_regs")
Signed-off-by: Sandipan Das <redacted>

Thanks! Applied to bpf tree.

I already have this in the fixes branch of the powerpc tree. I don't
mind if you take it also, git should probably handle the merge OK.

cheers

On Thu, 2018-12-06 at 09:27:01 UTC, Sandipan Das wrote:

Now that there are different variants of pt_regs for userspace and
kernel, the uapi for the BPF_PROG_TYPE_PERF_EVENT program type must
be changed by exporting the user_pt_regs structure instead of the
pt_regs structure that is in-kernel only.

Fixes: 002af9391bfb ("powerpc: Split user/kernel definitions of struct pt_regs")
Signed-off-by: Sandipan Das <redacted>

Applied to powerpc fixes, thanks.

https://git.kernel.org/powerpc/c/a6460b03f945ee216dbf42a0d9ee78

cheers