KVM: powerpc: Fix mtsrin in book3s_64 mmu

We were shifting the Ks/Kp/N bits one bit too far on mtsrin. It took
me some time to figure that out, so I also put in some debugging and a
comment explaining the conversion.

This fixes current OpenBIOS boot on PPC64 KVM.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>

diff --git a/arch/powerpc/kvm/book3s_64_mmu.c b/arch/powerpc/kvm/book3s_64_mmu.c
index 5598f88..e4beeb3 100644 (file)
--- a/arch/powerpc/kvm/book3s_64_mmu.c
+++ b/arch/powerpc/kvm/book3s_64_mmu.c
@@ -390,6 +390,26 @@ static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
 {
        u64 rb = 0, rs = 0;
 
+       /*
+        * According to Book3 2.01 mtsrin is implemented as:
+        *
+        * The SLB entry specified by (RB)32:35 is loaded from register
+        * RS, as follows.
+        *
+        * SLBE Bit     Source                  SLB Field
+        *
+        * 0:31         0x0000_0000             ESID-0:31
+        * 32:35        (RB)32:35               ESID-32:35
+        * 36           0b1                     V
+        * 37:61        0x00_0000|| 0b0         VSID-0:24
+        * 62:88        (RS)37:63               VSID-25:51
+        * 89:91        (RS)33:35               Ks Kp N
+        * 92           (RS)36                  L ((RS)36 must be 0b0)
+        * 93           0b0                     C
+        */
+
+       dprintk("KVM MMU: mtsrin(0x%x, 0x%lx)\n", srnum, value);
+
        /* ESID = srnum */
        rb |= (srnum & 0xf) << 28;
        /* Set the valid bit */
@@ -400,7 +420,7 @@ static void kvmppc_mmu_book3s_64_mtsrin(struct kvm_vcpu *vcpu, u32 srnum,
        /* VSID = VSID */
        rs |= (value & 0xfffffff) << 12;
        /* flags = flags */
-       rs |= ((value >> 27) & 0xf) << 9;
+       rs |= ((value >> 28) & 0x7) << 9;
 
        kvmppc_mmu_book3s_64_slbmte(vcpu, rs, rb);
 }