Make head_64.S aware of KVM real mode code

We need to run some KVM trampoline code in real mode. Unfortunately, real mode
only covers 8MB on Cell so we need to squeeze ourselves as low as possible.

Also, we need to trap interrupts to get us back from guest state to host state
without telling Linux about it.

This patch adds interrupt traps and includes the KVM code that requires real
mode in the real mode parts of Linux.

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

2 files changed, 15 insertions, 0 deletions

diff --git a/arch/powerpc/kernel/exceptions-64s.S b/arch/powerpc/kernel/exceptions-64s.S
index 1808876edcc9..fc3ead066cec 100644
--- a/arch/powerpc/kernel/exceptions-64s.S
+++ b/arch/powerpc/kernel/exceptions-64s.S
@@ -41,6 +41,7 @@ __start_interrupts:
         . = 0x200
 _machine_check_pSeries:
         HMT_MEDIUM
+        DO_KVM  0x200
         mtspr   SPRN_SPRG_SCRATCH0,r13          /* save r13 */
         EXCEPTION_PROLOG_PSERIES(PACA_EXMC, machine_check_common)
 
@@ -48,6 +49,7 @@ _machine_check_pSeries:
         .globl data_access_pSeries
 data_access_pSeries:
         HMT_MEDIUM
+        DO_KVM  0x300
         mtspr   SPRN_SPRG_SCRATCH0,r13
 BEGIN_FTR_SECTION
         mfspr   r13,SPRN_SPRG_PACA
@@ -77,6 +79,7 @@ ALT_FTR_SECTION_END_IFCLR(CPU_FTR_SLB)
         .globl data_access_slb_pSeries
 data_access_slb_pSeries:
         HMT_MEDIUM
+        DO_KVM  0x380
         mtspr   SPRN_SPRG_SCRATCH0,r13
         mfspr   r13,SPRN_SPRG_PACA              /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
@@ -115,6 +118,7 @@ data_access_slb_pSeries:
         .globl instruction_access_slb_pSeries
 instruction_access_slb_pSeries:
         HMT_MEDIUM
+        DO_KVM  0x480
         mtspr   SPRN_SPRG_SCRATCH0,r13
         mfspr   r13,SPRN_SPRG_PACA              /* get paca address into r13 */
         std     r3,PACA_EXSLB+EX_R3(r13)
@@ -154,6 +158,7 @@ instruction_access_slb_pSeries:
         .globl  system_call_pSeries
 system_call_pSeries:
         HMT_MEDIUM
+        DO_KVM  0xc00
 BEGIN_FTR_SECTION
         cmpdi   r0,0x1ebe
         beq-    1f
@@ -186,12 +191,15 @@ END_FTR_SECTION_IFSET(CPU_FTR_REAL_LE)
          * trickery is thus necessary
          */
         . = 0xf00
+        DO_KVM  0xf00
         b       performance_monitor_pSeries
 
         . = 0xf20
+        DO_KVM  0xf20
         b       altivec_unavailable_pSeries
 
         . = 0xf40
+        DO_KVM  0xf40
         b       vsx_unavailable_pSeries
 
 #ifdef CONFIG_CBE_RAS
diff --git a/arch/powerpc/kernel/head_64.S b/arch/powerpc/kernel/head_64.S
index c38afdb45d7b..925807488022 100644
--- a/arch/powerpc/kernel/head_64.S
+++ b/arch/powerpc/kernel/head_64.S
@@ -37,6 +37,7 @@
 #include <asm/firmware.h>
 #include <asm/page_64.h>
 #include <asm/irqflags.h>
+#include <asm/kvm_book3s_64_asm.h>
 
 /* The physical memory is layed out such that the secondary processor
  * spin code sits at 0x0000...0x00ff. On server, the vectors follow
@@ -165,6 +166,12 @@ exception_marker:
 #include "exceptions-64s.S"
 #endif
 
+/* KVM trampoline code needs to be close to the interrupt handlers */
+
+#ifdef CONFIG_KVM_BOOK3S_64_HANDLER
+#include "../kvm/book3s_64_rmhandlers.S"
+#endif
+
 _GLOBAL(generic_secondary_thread_init)
         mr      r24,r3