kvm: ppc: bookehv: Save restore SPRN_SPRG9 on guest entry exit

SPRN_SPRG is used by debug interrupt handler, so this is required for
debug support.

Signed-off-by: Bharat Bhushan <Bharat.Bhushan@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>

3 files changed, 6 insertions, 0 deletions

diff --git a/arch/powerpc/include/asm/kvm_host.h b/arch/powerpc/include/asm/kvm_host.h
index 855ba4d9539d..562f685d1678 100644
--- a/arch/powerpc/include/asm/kvm_host.h
+++ b/arch/powerpc/include/asm/kvm_host.h
@@ -587,6 +587,7 @@ struct kvm_vcpu_arch {
         u32 mmucfg;
         u32 eptcfg;
         u32 epr;
+        u64 sprg9;
         u32 pwrmgtcr0;
         u32 crit_save;
         /* guest debug registers*/
diff --git a/arch/powerpc/kernel/asm-offsets.c b/arch/powerpc/kernel/asm-offsets.c
index 17ffcb4f27f9..ab9ae0411e8f 100644
--- a/arch/powerpc/kernel/asm-offsets.c
+++ b/arch/powerpc/kernel/asm-offsets.c
@@ -668,6 +668,7 @@ int main(void)
         DEFINE(VCPU_LR, offsetof(struct kvm_vcpu, arch.lr));
         DEFINE(VCPU_CTR, offsetof(struct kvm_vcpu, arch.ctr));
         DEFINE(VCPU_PC, offsetof(struct kvm_vcpu, arch.pc));
+        DEFINE(VCPU_SPRG9, offsetof(struct kvm_vcpu, arch.sprg9));
         DEFINE(VCPU_LAST_INST, offsetof(struct kvm_vcpu, arch.last_inst));
         DEFINE(VCPU_FAULT_DEAR, offsetof(struct kvm_vcpu, arch.fault_dear));
         DEFINE(VCPU_FAULT_ESR, offsetof(struct kvm_vcpu, arch.fault_esr));
diff --git a/arch/powerpc/kvm/bookehv_interrupts.S b/arch/powerpc/kvm/bookehv_interrupts.S
index e000b397ece3..b4f8fbafee7a 100644
--- a/arch/powerpc/kvm/bookehv_interrupts.S
+++ b/arch/powerpc/kvm/bookehv_interrupts.S
@@ -398,6 +398,7 @@ _GLOBAL(kvmppc_resume_host)
 #ifdef CONFIG_64BIT
         PPC_LL  r3, PACA_SPRG_VDSO(r13)
 #endif
+        mfspr   r5, SPRN_SPRG9
         PPC_STD(r6, VCPU_SHARED_SPRG4, r11)
         mfspr   r8, SPRN_SPRG6
         PPC_STD(r7, VCPU_SHARED_SPRG5, r11)
@@ -405,6 +406,7 @@ _GLOBAL(kvmppc_resume_host)
 #ifdef CONFIG_64BIT
         mtspr   SPRN_SPRG_VDSO_WRITE, r3
 #endif
+        PPC_STD(r5, VCPU_SPRG9, r4)
         PPC_STD(r8, VCPU_SHARED_SPRG6, r11)
         mfxer   r3
         PPC_STD(r9, VCPU_SHARED_SPRG7, r11)
@@ -639,7 +641,9 @@ lightweight_exit:
         mtspr   SPRN_SPRG5W, r6
         PPC_LD(r8, VCPU_SHARED_SPRG7, r11)
         mtspr   SPRN_SPRG6W, r7
+        PPC_LD(r5, VCPU_SPRG9, r4)
         mtspr   SPRN_SPRG7W, r8
+        mtspr   SPRN_SPRG9, r5
 
         /* Load some guest volatiles. */
         PPC_LL  r3, VCPU_LR(r4)