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authorRusty Russell <rusty@rustcorp.com.au>2007-10-22 11:03:35 +1000
committerRusty Russell <rusty@rustcorp.com.au>2007-10-23 15:49:53 +1000
commitc18acd73ffc209def08003a1927473096f66c5ad (patch)
treedd8e292ac8ca90b061b7e37ad6947231ced566e3 /include/linux/lguest.h
parentee3db0f2b6053b65f3b70253f5f810d9a3d67b28 (diff)
downloadlwn-c18acd73ffc209def08003a1927473096f66c5ad.tar.gz
lwn-c18acd73ffc209def08003a1927473096f66c5ad.zip
Allow guest to specify syscall vector to use.
(Based on Ron Minnich's LGUEST_PLAN9_SYSCALL patch). This patch allows Guests to specify what system call vector they want, and we try to reserve it. We only allow one non-Linux system call vector, to try to avoid DoS on the Host. Signed-off-by: Rusty Russell <rusty@rustcorp.com.au>
Diffstat (limited to 'include/linux/lguest.h')
-rw-r--r--include/linux/lguest.h3
1 files changed, 3 insertions, 0 deletions
diff --git a/include/linux/lguest.h b/include/linux/lguest.h
index 9ddac2f0a97c..083052236db9 100644
--- a/include/linux/lguest.h
+++ b/include/linux/lguest.h
@@ -48,6 +48,9 @@ struct lguest_data
/* Fields initialized by the Guest at boot: */
/* Instruction range to suppress interrupts even if enabled */
unsigned long noirq_start, noirq_end;
+
+ /* The vector to try to use for system calls (0x40 or 0x80). */
+ unsigned int syscall_vec;
};
extern struct lguest_data lguest_data;
#endif /* __ASSEMBLY__ */