@@ -1646,4 +1646,6 @@ static inline void cpu_set_tls(CPUState *env, target_ulong newtls)
#endif
}
+extern void (*cpu_ppc_hypercall)(CPUState *);
+
#endif /* !defined (__CPU_PPC_H__) */
@@ -70,6 +70,10 @@
# define LOG_EXCP(...) do { } while (0)
#endif
+/*****************************************************************************/
+/* PowerPC Hypercall emulation */
+
+void (*cpu_ppc_hypercall)(CPUState *);
/*****************************************************************************/
/* PowerPC MMU emulation */
@@ -2152,6 +2156,10 @@ static inline void powerpc_excp(CPUState *env, int excp_model, int excp)
case POWERPC_EXCP_SYSCALL: /* System call exception */
dump_syscall(env);
lev = env->error_code;
+ if ((lev == 1) && cpu_ppc_hypercall) {
+ cpu_ppc_hypercall(env);
+ return;
+ }
if (lev == 1 || (lpes0 == 0 && lpes1 == 0))
new_msr |= (target_ulong)MSR_HVB;
goto store_next;
PowerPC and POWER chips since the POWER4 and 970 have a special hypervisor mode, and a corresponding form of the system call instruction which traps to the hypervisor. qemu currently has stub implementations of hypervisor mode. That is, the outline is there to allow qemu to run a PowerPC hypervisor under emulation. There are a number of details missing so this won't actually work at present, but the idea is there. What there is no provision at all, is for qemu to instead emulate the hypervisor itself. That is to have hypercalls trap into qemu and their result be emulated from qemu, rather than running hypervisor code within the emulated system. Hypervisor hardware aware KVM implementations are in the works and it would be useful for debugging and development to also allow full emulation of the same para-virtualized guests as such a KVM. Therefore, this patch adds a hook which will allow a machine to set up emulation of hypervisor calls. Signed-off-by: David Gibson <dwg@au1.ibm.com> --- target-ppc/cpu.h | 2 ++ target-ppc/helper.c | 8 ++++++++ 2 files changed, 10 insertions(+), 0 deletions(-)