KVM: PPC: PV mtmsrd L=1

The PowerPC ISA has a special instruction for mtmsr that only changes the EE
and RI bits, namely the L=1 form.

Since that one is reasonably often occuring and simple to implement, let's
go with this first. Writing EE=0 is always just a store. Doing EE=1 also
requires us to check for pending interrupts and if necessary exit back to the
hypervisor.

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

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 239a70d..717ab0d 100644 (file)
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -63,6 +63,7 @@
 #define KVM_INST_MTSPR_DSISR   0x7c1203a6
 
 #define KVM_INST_TLBSYNC       0x7c00046c
+#define KVM_INST_MTMSRD_L1     0x7c010164
 
 static bool kvm_patching_worked = true;
 static char kvm_tmp[1024 * 1024];
@@ -138,6 +139,43 @@ static u32 *kvm_alloc(int len)
        return p;
 }
 
+extern u32 kvm_emulate_mtmsrd_branch_offs;
+extern u32 kvm_emulate_mtmsrd_reg_offs;
+extern u32 kvm_emulate_mtmsrd_len;
+extern u32 kvm_emulate_mtmsrd[];
+
+static void kvm_patch_ins_mtmsrd(u32 *inst, u32 rt)
+{
+       u32 *p;
+       int distance_start;
+       int distance_end;
+       ulong next_inst;
+
+       p = kvm_alloc(kvm_emulate_mtmsrd_len * 4);
+       if (!p)
+               return;
+
+       /* Find out where we are and put everything there */
+       distance_start = (ulong)p - (ulong)inst;
+       next_inst = ((ulong)inst + 4);
+       distance_end = next_inst - (ulong)&p[kvm_emulate_mtmsrd_branch_offs];
+
+       /* Make sure we only write valid b instructions */
+       if (distance_start > KVM_INST_B_MAX) {
+               kvm_patching_worked = false;
+               return;
+       }
+
+       /* Modify the chunk to fit the invocation */
+       memcpy(p, kvm_emulate_mtmsrd, kvm_emulate_mtmsrd_len * 4);
+       p[kvm_emulate_mtmsrd_branch_offs] |= distance_end & KVM_INST_B_MASK;
+       p[kvm_emulate_mtmsrd_reg_offs] |= rt;
+       flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
+
+       /* Patch the invocation */
+       kvm_patch_ins_b(inst, distance_start);
+}
+
 static void kvm_map_magic_page(void *data)
 {
        kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
@@ -211,6 +249,13 @@ static void kvm_check_ins(u32 *inst)
        case KVM_INST_TLBSYNC:
                kvm_patch_ins_nop(inst);
                break;
+
+       /* Rewrites */
+       case KVM_INST_MTMSRD_L1:
+               /* We use r30 and r31 during the hook */
+               if (get_rt(inst_rt) < 30)
+                       kvm_patch_ins_mtmsrd(inst, inst_rt);
+               break;
        }
 
        switch (_inst) {

diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S
index 1dac72d..10dc4a6 100644 (file)
--- a/arch/powerpc/kernel/kvm_emul.S
+++ b/arch/powerpc/kernel/kvm_emul.S
@@ -64,3 +64,59 @@ kvm_hypercall_start:
        /* Disable critical section. We are critical if                 \
           shared->critical == r1 and r2 is always != r1 */             \
        STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
+
+.global kvm_emulate_mtmsrd
+kvm_emulate_mtmsrd:
+
+       SCRATCH_SAVE
+
+       /* Put MSR & ~(MSR_EE|MSR_RI) in r31 */
+       LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
+       lis     r30, (~(MSR_EE | MSR_RI))@h
+       ori     r30, r30, (~(MSR_EE | MSR_RI))@l
+       and     r31, r31, r30
+
+       /* OR the register's (MSR_EE|MSR_RI) on MSR */
+kvm_emulate_mtmsrd_reg:
+       andi.   r30, r0, (MSR_EE|MSR_RI)
+       or      r31, r31, r30
+
+       /* Put MSR back into magic page */
+       STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
+
+       /* Check if we have to fetch an interrupt */
+       lwz     r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0)
+       cmpwi   r31, 0
+       beq+    no_check
+
+       /* Check if we may trigger an interrupt */
+       andi.   r30, r30, MSR_EE
+       beq     no_check
+
+       SCRATCH_RESTORE
+
+       /* Nag hypervisor */
+       tlbsync
+
+       b       kvm_emulate_mtmsrd_branch
+
+no_check:
+
+       SCRATCH_RESTORE
+
+       /* Go back to caller */
+kvm_emulate_mtmsrd_branch:
+       b       .
+kvm_emulate_mtmsrd_end:
+
+.global kvm_emulate_mtmsrd_branch_offs
+kvm_emulate_mtmsrd_branch_offs:
+       .long (kvm_emulate_mtmsrd_branch - kvm_emulate_mtmsrd) / 4
+
+.global kvm_emulate_mtmsrd_reg_offs
+kvm_emulate_mtmsrd_reg_offs:
+       .long (kvm_emulate_mtmsrd_reg - kvm_emulate_mtmsrd) / 4
+
+.global kvm_emulate_mtmsrd_len
+kvm_emulate_mtmsrd_len:
+       .long (kvm_emulate_mtmsrd_end - kvm_emulate_mtmsrd) / 4