KVM: PPC: Book3S HV: Add support for real mode ICP in XICS emulation

This adds an implementation of the XICS hypercalls in real mode for HV
KVM, which allows us to avoid exiting the guest MMU context on all
threads for a variety of operations such as fetching a pending
interrupt, EOI of messages, IPIs, etc.

Signed-off-by: Benjamin Herrenschmidt <benh@kernel.crashing.org>
Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>

1 files changed, 13 insertions, 5 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_rmhandlers.S b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
index 56f8927b0ddf..fd3b72d5dfe6 100644
--- a/arch/powerpc/kvm/book3s_hv_rmhandlers.S
+++ b/arch/powerpc/kvm/book3s_hv_rmhandlers.S
@@ -1424,11 +1424,19 @@ hcall_real_table:
         .long   0               /* 0x58 */
         .long   0               /* 0x5c */
         .long   0               /* 0x60 */
-        .long   0               /* 0x64 */
-        .long   0               /* 0x68 */
-        .long   0               /* 0x6c */
-        .long   0               /* 0x70 */
-        .long   0               /* 0x74 */
+#ifdef CONFIG_KVM_XICS
+        .long   .kvmppc_rm_h_eoi - hcall_real_table
+        .long   .kvmppc_rm_h_cppr - hcall_real_table
+        .long   .kvmppc_rm_h_ipi - hcall_real_table
+        .long   0               /* 0x70 - H_IPOLL */
+        .long   .kvmppc_rm_h_xirr - hcall_real_table
+#else
+        .long   0               /* 0x64 - H_EOI */
+        .long   0               /* 0x68 - H_CPPR */
+        .long   0               /* 0x6c - H_IPI */
+        .long   0               /* 0x70 - H_IPOLL */
+        .long   0               /* 0x74 - H_XIRR */
+#endif
         .long   0               /* 0x78 */
         .long   0               /* 0x7c */
         .long   0               /* 0x80 */