Quoting Pekka Enberg ([email protected]):
> On 1/11/07, Serge E. Hallyn <[email protected]> wrote:
> >Right, but is returning -EINVAL to userspace on munmap a problem?
>
> Yes, because an application has no way of reusing the revoked mapping
> range. The current patch should get this right, though.
Looks good.
> On 1/11/07, Serge E. Hallyn <[email protected]> wrote:
> >Thanks for the tw other patches - I'll give them a shot and check
> >out current munmap behavior just as soon as I get a chance.
>
> I hacked the remaining open issues yesterday so please use this instead:
>
> http://www.cs.helsinki.fi/u/penberg/linux/revoke/revoke-2.6.20-rc4
>
> The one at kernel.org will be updated as well when mirroring catches up.
Great, this patch (with the attached trivial patch to implement the
syscalls on my z guest) passes all of your testcases.
I'll give it a another, closer read over the weekend, and start
basing something to help slim on this code.
-serge
Subject: [PATCH] revoke: s390 architecture
Implement the revoke syscalls for s390.
Signed-off-by: Serge E. Hallyn <[email protected]>
---
arch/s390/kernel/compat_wrapper.S | 11 +++++++++++
arch/s390/kernel/syscalls.S | 2 ++
include/asm-s390/unistd.h | 4 +++-
3 files changed, 16 insertions(+), 1 deletions(-)
24ebe37142572d388569851edf4b919b7f97cc2f
diff --git a/arch/s390/kernel/compat_wrapper.S b/arch/s390/kernel/compat_wrapper.S
index 71e54ef..b5c2bfa 100644
--- a/arch/s390/kernel/compat_wrapper.S
+++ b/arch/s390/kernel/compat_wrapper.S
@@ -1665,3 +1665,14 @@ sys_getcpu_wrapper:
llgtr %r3,%r3 # unsigned *
llgtr %r4,%r4 # struct getcpu_cache *
jg sys_getcpu
+
+ .globl sys_revokeat_wrapper
+sys_revokeat_wrapper:
+ lgfr %r2,%r2 # int
+ llgtr %r3,%r3 # const char *
+ jg sys_revokeat
+
+ .globl sys_frevoke_wrapper
+sys_frevoke_wrapper:
+ llgfr %r2,%r2 # unsigned int
+ jg sys_frevoke
diff --git a/arch/s390/kernel/syscalls.S b/arch/s390/kernel/syscalls.S
index a4ceae3..85a6673 100644
--- a/arch/s390/kernel/syscalls.S
+++ b/arch/s390/kernel/syscalls.S
@@ -321,3 +321,5 @@ SYSCALL(sys_vmsplice,sys_vmsplice,compat
NI_SYSCALL /* 310 sys_move_pages */
SYSCALL(sys_getcpu,sys_getcpu,sys_getcpu_wrapper)
SYSCALL(sys_epoll_pwait,sys_epoll_pwait,sys_ni_syscall)
+SYSCALL(sys_revokeat,sys_revokeat,sys_revokeat_wrapper)
+SYSCALL(sys_frevoke,sys_frevoke,sys_frevoke_wrapper)
diff --git a/include/asm-s390/unistd.h b/include/asm-s390/unistd.h
index fb6fef9..6651cb1 100644
--- a/include/asm-s390/unistd.h
+++ b/include/asm-s390/unistd.h
@@ -250,8 +250,10 @@
/* Number 310 is reserved for new sys_move_pages */
#define __NR_getcpu 311
#define __NR_epoll_pwait 312
+#define __NR_revokeat 313
+#define __NR_frevoke 314
-#define NR_syscalls 313
+#define NR_syscalls 315
/*
* There are some system calls that are not present on 64 bit, some
--
1.1.6
-
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