Merge tag 'powerpc-fixes' of git://github.com/paulusmack/linux into new/master

Five fixes for bugs that have crept in to the powerpc KVM implementations.
These are all small simple patches that only affect arch/powerpc/kvm.
They come from the series that Alex Graf put together but which was too
late for the 3.4 merge window.

* tag 'powerpc-fixes' of git://github.com/paulusmack/linux:
  KVM: PPC: Book3S: PR: Fix preemption
  KVM: PPC: Save/Restore CR over vcpu_run
  KVM: PPC: Book3S HV: Save and restore CR in __kvmppc_vcore_entry
  KVM: PPC: Book3S HV: Fix kvm_alloc_linear in case where no linears exist
  KVM: PPC: Book3S: Compile fix for ppc32 in HIOR access code

Signed-off-by: Avi Kivity <avi@redhat.com>

5 files changed, 29 insertions, 11 deletions

diff --git a/arch/powerpc/kvm/book3s_hv_builtin.c b/arch/powerpc/kvm/book3s_hv_builtin.c
index bed1279aa6a..e1b60f56f2a 100644
--- a/arch/powerpc/kvm/book3s_hv_builtin.c
+++ b/arch/powerpc/kvm/book3s_hv_builtin.c
@@ -173,9 +173,9 @@ static void __init kvm_linear_init_one(ulong size, int count, int type)
 
 static struct kvmppc_linear_info *kvm_alloc_linear(int type)
 {
-        struct kvmppc_linear_info *ri;
+        struct kvmppc_linear_info *ri, *ret;
 
-        ri = NULL;
+        ret = NULL;
         spin_lock(&linear_lock);
         list_for_each_entry(ri, &free_linears, list) {
                 if (ri->type != type)
@@ -183,11 +183,12 @@ static struct kvmppc_linear_info *kvm_alloc_linear(int type)
 
                 list_del(&ri->list);
                 atomic_inc(&ri->use_count);
+                memset(ri->base_virt, 0, ri->npages << PAGE_SHIFT);
+                ret = ri;
                 break;
         }
         spin_unlock(&linear_lock);
-        memset(ri->base_virt, 0, ri->npages << PAGE_SHIFT);
-        return ri;
+        return ret;
 }
 
 static void kvm_release_linear(struct kvmppc_linear_info *ri)
diff --git a/arch/powerpc/kvm/book3s_hv_interrupts.S b/arch/powerpc/kvm/book3s_hv_interrupts.S
index 3f7b674dd4b..d3fb4df02c4 100644
--- a/arch/powerpc/kvm/book3s_hv_interrupts.S
+++ b/arch/powerpc/kvm/book3s_hv_interrupts.S
@@ -46,8 +46,10 @@ _GLOBAL(__kvmppc_vcore_entry)
         /* Save host state to the stack */
         stdu    r1, -SWITCH_FRAME_SIZE(r1)
 
-        /* Save non-volatile registers (r14 - r31) */
+        /* Save non-volatile registers (r14 - r31) and CR */
         SAVE_NVGPRS(r1)
+        mfcr    r3
+        std     r3, _CCR(r1)
 
         /* Save host DSCR */
 BEGIN_FTR_SECTION
@@ -157,8 +159,10 @@ kvmppc_handler_highmem:
          * R13      = PACA
          */
 
-        /* Restore non-volatile host registers (r14 - r31) */
+        /* Restore non-volatile host registers (r14 - r31) and CR */
         REST_NVGPRS(r1)
+        ld      r4, _CCR(r1)
+        mtcr    r4
 
         addi    r1, r1, SWITCH_FRAME_SIZE
         ld      r0, PPC_LR_STKOFF(r1)
diff --git a/arch/powerpc/kvm/book3s_interrupts.S b/arch/powerpc/kvm/book3s_interrupts.S
index 0a8515a5c04..3e35383bdb2 100644
--- a/arch/powerpc/kvm/book3s_interrupts.S
+++ b/arch/powerpc/kvm/book3s_interrupts.S
@@ -84,6 +84,10 @@ kvm_start_entry:
         /* Save non-volatile registers (r14 - r31) */
         SAVE_NVGPRS(r1)
 
+        /* Save CR */
+        mfcr    r14
+        stw     r14, _CCR(r1)
+
         /* Save LR */
         PPC_STL r0, _LINK(r1)
 
@@ -165,6 +169,9 @@ kvm_exit_loop:
         PPC_LL  r4, _LINK(r1)
         mtlr    r4
 
+        lwz     r14, _CCR(r1)
+        mtcr    r14
+
         /* Restore non-volatile host registers (r14 - r31) */
         REST_NVGPRS(r1)
 
diff --git a/arch/powerpc/kvm/book3s_pr.c b/arch/powerpc/kvm/book3s_pr.c
index 642d88574b0..7759053d391 100644
--- a/arch/powerpc/kvm/book3s_pr.c
+++ b/arch/powerpc/kvm/book3s_pr.c
@@ -777,6 +777,7 @@ program_interrupt:
         }
         }
 
+        preempt_disable();
         if (!(r & RESUME_HOST)) {
                 /* To avoid clobbering exit_reason, only check for signals if
                  * we aren't already exiting to userspace for some other
@@ -798,8 +799,6 @@ program_interrupt:
                         run->exit_reason = KVM_EXIT_INTR;
                         r = -EINTR;
                 } else {
-                        preempt_disable();
-
                         /* In case an interrupt came in that was triggered
                          * from userspace (like DEC), we need to check what
                          * to inject now! */
@@ -881,7 +880,8 @@ int kvm_vcpu_ioctl_get_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 
         switch (reg->id) {
         case KVM_REG_PPC_HIOR:
-                r = put_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
+                r = copy_to_user((u64 __user *)(long)reg->addr,
+                                &to_book3s(vcpu)->hior, sizeof(u64));
                 break;
         default:
                 break;
@@ -896,7 +896,8 @@ int kvm_vcpu_ioctl_set_one_reg(struct kvm_vcpu *vcpu, struct kvm_one_reg *reg)
 
         switch (reg->id) {
         case KVM_REG_PPC_HIOR:
-                r = get_user(to_book3s(vcpu)->hior, (u64 __user *)reg->addr);
+                r = copy_from_user(&to_book3s(vcpu)->hior,
+                                   (u64 __user *)(long)reg->addr, sizeof(u64));
                 if (!r)
                         to_book3s(vcpu)->hior_explicit = true;
                 break;
diff --git a/arch/powerpc/kvm/booke_interrupts.S b/arch/powerpc/kvm/booke_interrupts.S
index 10d8ef602e5..c8c4b878795 100644
--- a/arch/powerpc/kvm/booke_interrupts.S
+++ b/arch/powerpc/kvm/booke_interrupts.S
@@ -34,7 +34,8 @@
 /* r2 is special: it holds 'current', and it made nonvolatile in the
  * kernel with the -ffixed-r2 gcc option. */
 #define HOST_R2         12
-#define HOST_NV_GPRS    16
+#define HOST_CR         16
+#define HOST_NV_GPRS    20
 #define HOST_NV_GPR(n)  (HOST_NV_GPRS + ((n - 14) * 4))
 #define HOST_MIN_STACK_SIZE (HOST_NV_GPR(31) + 4)
 #define HOST_STACK_SIZE (((HOST_MIN_STACK_SIZE + 15) / 16) * 16) /* Align. */
@@ -296,8 +297,10 @@ heavyweight_exit:
 
         /* Return to kvm_vcpu_run(). */
         lwz     r4, HOST_STACK_LR(r1)
+        lwz     r5, HOST_CR(r1)
         addi    r1, r1, HOST_STACK_SIZE
         mtlr    r4
+        mtcr    r5
         /* r3 still contains the return code from kvmppc_handle_exit(). */
         blr
 
@@ -314,6 +317,8 @@ _GLOBAL(__kvmppc_vcpu_run)
         stw     r3, HOST_RUN(r1)
         mflr    r3
         stw     r3, HOST_STACK_LR(r1)
+        mfcr    r5
+        stw     r5, HOST_CR(r1)
 
         /* Save host non-volatile register state to stack. */
         stw     r14, HOST_NV_GPR(r14)(r1)