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>

1 files changed, 1 insertions, 0 deletions

diff --git a/arch/x86/lguest/boot.c b/arch/x86/lguest/boot.c
index 1040f9b2f997..3a06b51c98ad 100644
--- a/arch/x86/lguest/boot.c
+++ b/arch/x86/lguest/boot.c
@@ -87,6 +87,7 @@ struct lguest_data lguest_data = {
         .noirq_start = (u32)lguest_noirq_start,
         .noirq_end = (u32)lguest_noirq_end,
         .blocked_interrupts = { 1 }, /* Block timer interrupts */
+        .syscall_vec = SYSCALL_VECTOR,
 };
 static cycle_t clock_base;