Patchwork [20/27] KVM: PPC: PV tlbsync to nop

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Submitter Alexander Graf
Date July 1, 2010, 10:42 a.m.
Message ID <1277980982-12433-21-git-send-email-agraf@suse.de>
Download mbox | patch
Permalink /patch/57514/
State Not Applicable
Headers show

Comments

Alexander Graf - July 1, 2010, 10:42 a.m.
With our current MMU scheme we don't need to know about the tlbsync instruction.
So we can just nop it out.

Signed-off-by: Alexander Graf <agraf@suse.de>

---

v1 -> v2:

  - use kvm_patch_ins
---
 arch/powerpc/kernel/kvm.c |   12 ++++++++++++
 1 files changed, 12 insertions(+), 0 deletions(-)

Patch

diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 7094ee4..3a49de5 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -61,6 +61,8 @@ 
 #define KVM_INST_MTSPR_DAR	0x7c1303a6
 #define KVM_INST_MTSPR_DSISR	0x7c1203a6
 
+#define KVM_INST_TLBSYNC	0x7c00046c
+
 static bool kvm_patching_worked = true;
 
 static inline void kvm_patch_ins(u32 *inst, u32 new_inst)
@@ -97,6 +99,11 @@  static void kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
 	kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
 }
 
+static void kvm_patch_ins_nop(u32 *inst)
+{
+	kvm_patch_ins(inst, KVM_INST_NOP);
+}
+
 static void kvm_map_magic_page(void *data)
 {
 	kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
@@ -165,6 +172,11 @@  static void kvm_check_ins(u32 *inst)
 	case KVM_INST_MTSPR_DSISR:
 		kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
 		break;
+
+	/* Nops */
+	case KVM_INST_TLBSYNC:
+		kvm_patch_ins_nop(inst);
+		break;
 	}
 
 	switch (_inst) {