summaryrefslogtreecommitdiffstats
path: root/arch/powerpc/kernel/kvm.c
diff options
context:
space:
mode:
authorAnton Arapov <anton@redhat.com>2012-06-08 12:58:00 +0200
committerAnton Arapov <anton@redhat.com>2012-06-08 12:58:00 +0200
commit6792a3f47a2e42d7164292bf7f1a55cfc4c91652 (patch)
treeb90c002bfbbeaec92f5d8a2383dcabf6524016f7 /arch/powerpc/kernel/kvm.c
parentfe2895d3d55146cac65b273c0f83e2c7e543cd0e (diff)
downloadkernel-uprobes-6792a3f47a2e42d7164292bf7f1a55cfc4c91652.tar.gz
kernel-uprobes-6792a3f47a2e42d7164292bf7f1a55cfc4c91652.tar.xz
kernel-uprobes-6792a3f47a2e42d7164292bf7f1a55cfc4c91652.zip
fedora kernel: b920e9b748c595f970bf80ede7832d39f8d567dav3.4.1-2
Signed-off-by: Anton Arapov <anton@redhat.com>
Diffstat (limited to 'arch/powerpc/kernel/kvm.c')
-rw-r--r--arch/powerpc/kernel/kvm.c307
1 files changed, 261 insertions, 46 deletions
diff --git a/arch/powerpc/kernel/kvm.c b/arch/powerpc/kernel/kvm.c
index 2985338d0e1..62bdf238966 100644
--- a/arch/powerpc/kernel/kvm.c
+++ b/arch/powerpc/kernel/kvm.c
@@ -1,5 +1,6 @@
/*
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
+ * Copyright 2010-2011 Freescale Semiconductor, Inc.
*
* Authors:
* Alexander Graf <agraf@suse.de>
@@ -29,6 +30,7 @@
#include <asm/sections.h>
#include <asm/cacheflush.h>
#include <asm/disassemble.h>
+#include <asm/ppc-opcode.h>
#define KVM_MAGIC_PAGE (-4096L)
#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
@@ -41,34 +43,30 @@
#define KVM_INST_B 0x48000000
#define KVM_INST_B_MASK 0x03ffffff
#define KVM_INST_B_MAX 0x01ffffff
+#define KVM_INST_LI 0x38000000
#define KVM_MASK_RT 0x03e00000
#define KVM_RT_30 0x03c00000
#define KVM_MASK_RB 0x0000f800
#define KVM_INST_MFMSR 0x7c0000a6
-#define KVM_INST_MFSPR_SPRG0 0x7c1042a6
-#define KVM_INST_MFSPR_SPRG1 0x7c1142a6
-#define KVM_INST_MFSPR_SPRG2 0x7c1242a6
-#define KVM_INST_MFSPR_SPRG3 0x7c1342a6
-#define KVM_INST_MFSPR_SRR0 0x7c1a02a6
-#define KVM_INST_MFSPR_SRR1 0x7c1b02a6
-#define KVM_INST_MFSPR_DAR 0x7c1302a6
-#define KVM_INST_MFSPR_DSISR 0x7c1202a6
-
-#define KVM_INST_MTSPR_SPRG0 0x7c1043a6
-#define KVM_INST_MTSPR_SPRG1 0x7c1143a6
-#define KVM_INST_MTSPR_SPRG2 0x7c1243a6
-#define KVM_INST_MTSPR_SPRG3 0x7c1343a6
-#define KVM_INST_MTSPR_SRR0 0x7c1a03a6
-#define KVM_INST_MTSPR_SRR1 0x7c1b03a6
-#define KVM_INST_MTSPR_DAR 0x7c1303a6
-#define KVM_INST_MTSPR_DSISR 0x7c1203a6
+
+#define SPR_FROM 0
+#define SPR_TO 0x100
+
+#define KVM_INST_SPR(sprn, moveto) (0x7c0002a6 | \
+ (((sprn) & 0x1f) << 16) | \
+ (((sprn) & 0x3e0) << 6) | \
+ (moveto))
+
+#define KVM_INST_MFSPR(sprn) KVM_INST_SPR(sprn, SPR_FROM)
+#define KVM_INST_MTSPR(sprn) KVM_INST_SPR(sprn, SPR_TO)
#define KVM_INST_TLBSYNC 0x7c00046c
#define KVM_INST_MTMSRD_L0 0x7c000164
#define KVM_INST_MTMSRD_L1 0x7c010164
#define KVM_INST_MTMSR 0x7c000124
+#define KVM_INST_WRTEE 0x7c000106
#define KVM_INST_WRTEEI_0 0x7c000146
#define KVM_INST_WRTEEI_1 0x7c008146
@@ -270,26 +268,27 @@ static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
#ifdef CONFIG_BOOKE
-extern u32 kvm_emulate_wrteei_branch_offs;
-extern u32 kvm_emulate_wrteei_ee_offs;
-extern u32 kvm_emulate_wrteei_len;
-extern u32 kvm_emulate_wrteei[];
+extern u32 kvm_emulate_wrtee_branch_offs;
+extern u32 kvm_emulate_wrtee_reg_offs;
+extern u32 kvm_emulate_wrtee_orig_ins_offs;
+extern u32 kvm_emulate_wrtee_len;
+extern u32 kvm_emulate_wrtee[];
-static void kvm_patch_ins_wrteei(u32 *inst)
+static void kvm_patch_ins_wrtee(u32 *inst, u32 rt, int imm_one)
{
u32 *p;
int distance_start;
int distance_end;
ulong next_inst;
- p = kvm_alloc(kvm_emulate_wrteei_len * 4);
+ p = kvm_alloc(kvm_emulate_wrtee_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_wrteei_branch_offs];
+ distance_end = next_inst - (ulong)&p[kvm_emulate_wrtee_branch_offs];
/* Make sure we only write valid b instructions */
if (distance_start > KVM_INST_B_MAX) {
@@ -298,10 +297,65 @@ static void kvm_patch_ins_wrteei(u32 *inst)
}
/* Modify the chunk to fit the invocation */
- memcpy(p, kvm_emulate_wrteei, kvm_emulate_wrteei_len * 4);
- p[kvm_emulate_wrteei_branch_offs] |= distance_end & KVM_INST_B_MASK;
- p[kvm_emulate_wrteei_ee_offs] |= (*inst & MSR_EE);
- flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_len * 4);
+ memcpy(p, kvm_emulate_wrtee, kvm_emulate_wrtee_len * 4);
+ p[kvm_emulate_wrtee_branch_offs] |= distance_end & KVM_INST_B_MASK;
+
+ if (imm_one) {
+ p[kvm_emulate_wrtee_reg_offs] =
+ KVM_INST_LI | __PPC_RT(30) | MSR_EE;
+ } else {
+ /* Make clobbered registers work too */
+ switch (get_rt(rt)) {
+ case 30:
+ kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
+ magic_var(scratch2), KVM_RT_30);
+ break;
+ case 31:
+ kvm_patch_ins_ll(&p[kvm_emulate_wrtee_reg_offs],
+ magic_var(scratch1), KVM_RT_30);
+ break;
+ default:
+ p[kvm_emulate_wrtee_reg_offs] |= rt;
+ break;
+ }
+ }
+
+ p[kvm_emulate_wrtee_orig_ins_offs] = *inst;
+ flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrtee_len * 4);
+
+ /* Patch the invocation */
+ kvm_patch_ins_b(inst, distance_start);
+}
+
+extern u32 kvm_emulate_wrteei_0_branch_offs;
+extern u32 kvm_emulate_wrteei_0_len;
+extern u32 kvm_emulate_wrteei_0[];
+
+static void kvm_patch_ins_wrteei_0(u32 *inst)
+{
+ u32 *p;
+ int distance_start;
+ int distance_end;
+ ulong next_inst;
+
+ p = kvm_alloc(kvm_emulate_wrteei_0_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_wrteei_0_branch_offs];
+
+ /* Make sure we only write valid b instructions */
+ if (distance_start > KVM_INST_B_MAX) {
+ kvm_patching_worked = false;
+ return;
+ }
+
+ memcpy(p, kvm_emulate_wrteei_0, kvm_emulate_wrteei_0_len * 4);
+ p[kvm_emulate_wrteei_0_branch_offs] |= distance_end & KVM_INST_B_MASK;
+ flush_icache_range((ulong)p, (ulong)p + kvm_emulate_wrteei_0_len * 4);
/* Patch the invocation */
kvm_patch_ins_b(inst, distance_start);
@@ -380,56 +434,191 @@ static void kvm_check_ins(u32 *inst, u32 features)
case KVM_INST_MFMSR:
kvm_patch_ins_ld(inst, magic_var(msr), inst_rt);
break;
- case KVM_INST_MFSPR_SPRG0:
+ case KVM_INST_MFSPR(SPRN_SPRG0):
kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt);
break;
- case KVM_INST_MFSPR_SPRG1:
+ case KVM_INST_MFSPR(SPRN_SPRG1):
kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt);
break;
- case KVM_INST_MFSPR_SPRG2:
+ case KVM_INST_MFSPR(SPRN_SPRG2):
kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt);
break;
- case KVM_INST_MFSPR_SPRG3:
+ case KVM_INST_MFSPR(SPRN_SPRG3):
kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt);
break;
- case KVM_INST_MFSPR_SRR0:
+ case KVM_INST_MFSPR(SPRN_SRR0):
kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt);
break;
- case KVM_INST_MFSPR_SRR1:
+ case KVM_INST_MFSPR(SPRN_SRR1):
kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt);
break;
- case KVM_INST_MFSPR_DAR:
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_DEAR):
+#else
+ case KVM_INST_MFSPR(SPRN_DAR):
+#endif
kvm_patch_ins_ld(inst, magic_var(dar), inst_rt);
break;
- case KVM_INST_MFSPR_DSISR:
+ case KVM_INST_MFSPR(SPRN_DSISR):
kvm_patch_ins_lwz(inst, magic_var(dsisr), inst_rt);
break;
+#ifdef CONFIG_PPC_BOOK3E_MMU
+ case KVM_INST_MFSPR(SPRN_MAS0):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas0), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS1):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas1), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS2):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_ld(inst, magic_var(mas2), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS3):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas7_3) + 4, inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS4):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas4), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS6):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas6), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_MAS7):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(mas7_3), inst_rt);
+ break;
+#endif /* CONFIG_PPC_BOOK3E_MMU */
+
+ case KVM_INST_MFSPR(SPRN_SPRG4):
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_SPRG4R):
+#endif
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_ld(inst, magic_var(sprg4), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_SPRG5):
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_SPRG5R):
+#endif
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_ld(inst, magic_var(sprg5), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_SPRG6):
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_SPRG6R):
+#endif
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_ld(inst, magic_var(sprg6), inst_rt);
+ break;
+ case KVM_INST_MFSPR(SPRN_SPRG7):
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_SPRG7R):
+#endif
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_ld(inst, magic_var(sprg7), inst_rt);
+ break;
+
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MFSPR(SPRN_ESR):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(esr), inst_rt);
+ break;
+#endif
+
+ case KVM_INST_MFSPR(SPRN_PIR):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_lwz(inst, magic_var(pir), inst_rt);
+ break;
+
+
/* Stores */
- case KVM_INST_MTSPR_SPRG0:
+ case KVM_INST_MTSPR(SPRN_SPRG0):
kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt);
break;
- case KVM_INST_MTSPR_SPRG1:
+ case KVM_INST_MTSPR(SPRN_SPRG1):
kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt);
break;
- case KVM_INST_MTSPR_SPRG2:
+ case KVM_INST_MTSPR(SPRN_SPRG2):
kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt);
break;
- case KVM_INST_MTSPR_SPRG3:
+ case KVM_INST_MTSPR(SPRN_SPRG3):
kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt);
break;
- case KVM_INST_MTSPR_SRR0:
+ case KVM_INST_MTSPR(SPRN_SRR0):
kvm_patch_ins_std(inst, magic_var(srr0), inst_rt);
break;
- case KVM_INST_MTSPR_SRR1:
+ case KVM_INST_MTSPR(SPRN_SRR1):
kvm_patch_ins_std(inst, magic_var(srr1), inst_rt);
break;
- case KVM_INST_MTSPR_DAR:
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MTSPR(SPRN_DEAR):
+#else
+ case KVM_INST_MTSPR(SPRN_DAR):
+#endif
kvm_patch_ins_std(inst, magic_var(dar), inst_rt);
break;
- case KVM_INST_MTSPR_DSISR:
+ case KVM_INST_MTSPR(SPRN_DSISR):
kvm_patch_ins_stw(inst, magic_var(dsisr), inst_rt);
break;
+#ifdef CONFIG_PPC_BOOK3E_MMU
+ case KVM_INST_MTSPR(SPRN_MAS0):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas0), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS1):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas1), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS2):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_std(inst, magic_var(mas2), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS3):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas7_3) + 4, inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS4):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas4), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS6):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas6), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_MAS7):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(mas7_3), inst_rt);
+ break;
+#endif /* CONFIG_PPC_BOOK3E_MMU */
+
+ case KVM_INST_MTSPR(SPRN_SPRG4):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_std(inst, magic_var(sprg4), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_SPRG5):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_std(inst, magic_var(sprg5), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_SPRG6):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_std(inst, magic_var(sprg6), inst_rt);
+ break;
+ case KVM_INST_MTSPR(SPRN_SPRG7):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_std(inst, magic_var(sprg7), inst_rt);
+ break;
+
+#ifdef CONFIG_BOOKE
+ case KVM_INST_MTSPR(SPRN_ESR):
+ if (features & KVM_MAGIC_FEAT_MAS0_TO_SPRG7)
+ kvm_patch_ins_stw(inst, magic_var(esr), inst_rt);
+ break;
+#endif
/* Nops */
case KVM_INST_TLBSYNC:
@@ -444,6 +633,11 @@ static void kvm_check_ins(u32 *inst, u32 features)
case KVM_INST_MTMSRD_L0:
kvm_patch_ins_mtmsr(inst, inst_rt);
break;
+#ifdef CONFIG_BOOKE
+ case KVM_INST_WRTEE:
+ kvm_patch_ins_wrtee(inst, inst_rt, 0);
+ break;
+#endif
}
switch (inst_no_rt & ~KVM_MASK_RB) {
@@ -461,13 +655,19 @@ static void kvm_check_ins(u32 *inst, u32 features)
switch (_inst) {
#ifdef CONFIG_BOOKE
case KVM_INST_WRTEEI_0:
+ kvm_patch_ins_wrteei_0(inst);
+ break;
+
case KVM_INST_WRTEEI_1:
- kvm_patch_ins_wrteei(inst);
+ kvm_patch_ins_wrtee(inst, 0, 1);
break;
#endif
}
}
+extern u32 kvm_template_start[];
+extern u32 kvm_template_end[];
+
static void kvm_use_magic_page(void)
{
u32 *p;
@@ -488,8 +688,23 @@ static void kvm_use_magic_page(void)
start = (void*)_stext;
end = (void*)_etext;
- for (p = start; p < end; p++)
+ /*
+ * Being interrupted in the middle of patching would
+ * be bad for SPRG4-7, which KVM can't keep in sync
+ * with emulated accesses because reads don't trap.
+ */
+ local_irq_disable();
+
+ for (p = start; p < end; p++) {
+ /* Avoid patching the template code */
+ if (p >= kvm_template_start && p < kvm_template_end) {
+ p = kvm_template_end - 1;
+ continue;
+ }
kvm_check_ins(p, features);
+ }
+
+ local_irq_enable();
printk(KERN_INFO "KVM: Live patching for a fast VM %s\n",
kvm_patching_worked ? "worked" : "failed");