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09583dfed2
linux/arch/powerpc/kernel/kvm.c
Andreas Gruenbacher bb523b406c gup: Turn fault_in_pages_{readable,writeable} into fault_in_{readable,writeable} 
Turn fault_in_pages_{readable,writeable} into versions that return the
number of bytes not faulted in, similar to copy_to_user, instead of
returning a non-zero value when any of the requested pages couldn't be
faulted in.  This supports the existing users that require all pages to
be faulted in as well as new users that are happy if any pages can be
faulted in.

Rename the functions to fault_in_{readable,writeable} to make sure
this change doesn't silently break things.

Neither of these functions is entirely trivial and it doesn't seem
useful to inline them, so move them to mm/gup.c.

Signed-off-by: Andreas Gruenbacher <agruenba@redhat.com>
2021-10-18 16:33:03 +02:00

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// SPDX-License-Identifier: GPL-2.0-only
/*
* Copyright (C) 2010 SUSE Linux Products GmbH. All rights reserved.
* Copyright 2010-2011 Freescale Semiconductor, Inc.
*
* Authors:
* Alexander Graf <agraf@suse.de>
*/
#include <linux/kvm_host.h>
#include <linux/init.h>
#include <linux/export.h>
#include <linux/kmemleak.h>
#include <linux/kvm_para.h>
#include <linux/slab.h>
#include <linux/of.h>
#include <linux/pagemap.h>
#include <asm/reg.h>
#include <asm/sections.h>
#include <asm/cacheflush.h>
#include <asm/disassemble.h>
#include <asm/ppc-opcode.h>
#include <asm/epapr_hcalls.h>
#define KVM_MAGIC_PAGE (-4096L)
#define magic_var(x) KVM_MAGIC_PAGE + offsetof(struct kvm_vcpu_arch_shared, x)
#define KVM_INST_LWZ 0x80000000
#define KVM_INST_STW 0x90000000
#define KVM_INST_LD 0xe8000000
#define KVM_INST_STD 0xf8000000
#define KVM_INST_NOP 0x60000000
#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 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
#define KVM_INST_MTSRIN 0x7c0001e4
static bool kvm_patching_worked = true;
extern char kvm_tmp[];
extern char kvm_tmp_end[];
static int kvm_tmp_index;
static void __init kvm_patch_ins(u32 *inst, u32 new_inst)
{
*inst = new_inst;
flush_icache_range((ulong)inst, (ulong)inst + 4);
}
static void __init kvm_patch_ins_ll(u32 *inst, long addr, u32 rt)
{
#ifdef CONFIG_64BIT
kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
#else
kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000fffc));
#endif
}
static void __init kvm_patch_ins_ld(u32 *inst, long addr, u32 rt)
{
#ifdef CONFIG_64BIT
kvm_patch_ins(inst, KVM_INST_LD | rt | (addr & 0x0000fffc));
#else
kvm_patch_ins(inst, KVM_INST_LWZ | rt | ((addr + 4) & 0x0000fffc));
#endif
}
static void __init kvm_patch_ins_lwz(u32 *inst, long addr, u32 rt)
{
kvm_patch_ins(inst, KVM_INST_LWZ | rt | (addr & 0x0000ffff));
}
static void __init kvm_patch_ins_std(u32 *inst, long addr, u32 rt)
{
#ifdef CONFIG_64BIT
kvm_patch_ins(inst, KVM_INST_STD | rt | (addr & 0x0000fffc));
#else
kvm_patch_ins(inst, KVM_INST_STW | rt | ((addr + 4) & 0x0000fffc));
#endif
}
static void __init kvm_patch_ins_stw(u32 *inst, long addr, u32 rt)
{
kvm_patch_ins(inst, KVM_INST_STW | rt | (addr & 0x0000fffc));
}
static void __init kvm_patch_ins_nop(u32 *inst)
{
kvm_patch_ins(inst, KVM_INST_NOP);
}
static void __init kvm_patch_ins_b(u32 *inst, int addr)
{
#if defined(CONFIG_RELOCATABLE) && defined(CONFIG_PPC_BOOK3S)
/* On relocatable kernels interrupts handlers and our code
can be in different regions, so we don't patch them */
if ((ulong)inst < (ulong)&__end_interrupts)
return;
#endif
kvm_patch_ins(inst, KVM_INST_B | (addr & KVM_INST_B_MASK));
}
static u32 * __init kvm_alloc(int len)
{
u32 *p;
if ((kvm_tmp_index + len) > (kvm_tmp_end - kvm_tmp)) {
printk(KERN_ERR "KVM: No more space (%d + %d)\n",
kvm_tmp_index, len);
kvm_patching_worked = false;
return NULL;
}
p = (void*)&kvm_tmp[kvm_tmp_index];
kvm_tmp_index += len;
return p;
}
extern u32 kvm_emulate_mtmsrd_branch_offs;
extern u32 kvm_emulate_mtmsrd_reg_offs;
extern u32 kvm_emulate_mtmsrd_orig_ins_offs;
extern u32 kvm_emulate_mtmsrd_len;
extern u32 kvm_emulate_mtmsrd[];
static void __init 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;
switch (get_rt(rt)) {
case 30:
kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
magic_var(scratch2), KVM_RT_30);
break;
case 31:
kvm_patch_ins_ll(&p[kvm_emulate_mtmsrd_reg_offs],
magic_var(scratch1), KVM_RT_30);
break;
default:
p[kvm_emulate_mtmsrd_reg_offs] |= rt;
break;
}
p[kvm_emulate_mtmsrd_orig_ins_offs] = *inst;
flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsrd_len * 4);
/* Patch the invocation */
kvm_patch_ins_b(inst, distance_start);
}
extern u32 kvm_emulate_mtmsr_branch_offs;
extern u32 kvm_emulate_mtmsr_reg1_offs;
extern u32 kvm_emulate_mtmsr_reg2_offs;
extern u32 kvm_emulate_mtmsr_orig_ins_offs;
extern u32 kvm_emulate_mtmsr_len;
extern u32 kvm_emulate_mtmsr[];
static void __init kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
{
u32 *p;
int distance_start;
int distance_end;
ulong next_inst;
p = kvm_alloc(kvm_emulate_mtmsr_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_mtmsr_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_mtmsr, kvm_emulate_mtmsr_len * 4);
p[kvm_emulate_mtmsr_branch_offs] |= distance_end & KVM_INST_B_MASK;
/* Make clobbered registers work too */
switch (get_rt(rt)) {
case 30:
kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
magic_var(scratch2), KVM_RT_30);
kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
magic_var(scratch2), KVM_RT_30);
break;
case 31:
kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg1_offs],
magic_var(scratch1), KVM_RT_30);
kvm_patch_ins_ll(&p[kvm_emulate_mtmsr_reg2_offs],
magic_var(scratch1), KVM_RT_30);
break;
default:
p[kvm_emulate_mtmsr_reg1_offs] |= rt;
p[kvm_emulate_mtmsr_reg2_offs] |= rt;
break;
}
p[kvm_emulate_mtmsr_orig_ins_offs] = *inst;
flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtmsr_len * 4);
/* Patch the invocation */
kvm_patch_ins_b(inst, distance_start);
}
#ifdef CONFIG_BOOKE
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 __init 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_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_wrtee_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_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(R30) | 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 __init 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);
}
#endif
#ifdef CONFIG_PPC_BOOK3S_32
extern u32 kvm_emulate_mtsrin_branch_offs;
extern u32 kvm_emulate_mtsrin_reg1_offs;
extern u32 kvm_emulate_mtsrin_reg2_offs;
extern u32 kvm_emulate_mtsrin_orig_ins_offs;
extern u32 kvm_emulate_mtsrin_len;
extern u32 kvm_emulate_mtsrin[];
static void __init kvm_patch_ins_mtsrin(u32 *inst, u32 rt, u32 rb)
{
u32 *p;
int distance_start;
int distance_end;
ulong next_inst;
p = kvm_alloc(kvm_emulate_mtsrin_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_mtsrin_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_mtsrin, kvm_emulate_mtsrin_len * 4);
p[kvm_emulate_mtsrin_branch_offs] |= distance_end & KVM_INST_B_MASK;
p[kvm_emulate_mtsrin_reg1_offs] |= (rb << 10);
p[kvm_emulate_mtsrin_reg2_offs] |= rt;
p[kvm_emulate_mtsrin_orig_ins_offs] = *inst;
flush_icache_range((ulong)p, (ulong)p + kvm_emulate_mtsrin_len * 4);
/* Patch the invocation */
kvm_patch_ins_b(inst, distance_start);
}
#endif
static void __init kvm_map_magic_page(void *data)
{
u32 *features = data;
ulong in[8] = {0};
ulong out[8];
in[0] = KVM_MAGIC_PAGE;
in[1] = KVM_MAGIC_PAGE | MAGIC_PAGE_FLAG_NOT_MAPPED_NX;
epapr_hypercall(in, out, KVM_HCALL_TOKEN(KVM_HC_PPC_MAP_MAGIC_PAGE));
*features = out[0];
}
static void __init kvm_check_ins(u32 *inst, u32 features)
{
u32 _inst = *inst;
u32 inst_no_rt = _inst & ~KVM_MASK_RT;
u32 inst_rt = _inst & KVM_MASK_RT;
switch (inst_no_rt) {
/* Loads */
case KVM_INST_MFMSR:
kvm_patch_ins_ld(inst, magic_var(msr), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SPRG0):
kvm_patch_ins_ld(inst, magic_var(sprg0), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SPRG1):
kvm_patch_ins_ld(inst, magic_var(sprg1), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SPRG2):
kvm_patch_ins_ld(inst, magic_var(sprg2), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SPRG3):
kvm_patch_ins_ld(inst, magic_var(sprg3), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SRR0):
kvm_patch_ins_ld(inst, magic_var(srr0), inst_rt);
break;
case KVM_INST_MFSPR(SPRN_SRR1):
kvm_patch_ins_ld(inst, magic_var(srr1), inst_rt);
break;
#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(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(SPRN_SPRG0):
kvm_patch_ins_std(inst, magic_var(sprg0), inst_rt);
break;
case KVM_INST_MTSPR(SPRN_SPRG1):
kvm_patch_ins_std(inst, magic_var(sprg1), inst_rt);
break;
case KVM_INST_MTSPR(SPRN_SPRG2):
kvm_patch_ins_std(inst, magic_var(sprg2), inst_rt);
break;
case KVM_INST_MTSPR(SPRN_SPRG3):
kvm_patch_ins_std(inst, magic_var(sprg3), inst_rt);
break;
case KVM_INST_MTSPR(SPRN_SRR0):
kvm_patch_ins_std(inst, magic_var(srr0), inst_rt);
break;
case KVM_INST_MTSPR(SPRN_SRR1):
kvm_patch_ins_std(inst, magic_var(srr1), inst_rt);
break;
#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(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:
kvm_patch_ins_nop(inst);
break;
/* Rewrites */
case KVM_INST_MTMSRD_L1:
kvm_patch_ins_mtmsrd(inst, inst_rt);
break;
case KVM_INST_MTMSR:
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) {
#ifdef CONFIG_PPC_BOOK3S_32
case KVM_INST_MTSRIN:
if (features & KVM_MAGIC_FEAT_SR) {
u32 inst_rb = _inst & KVM_MASK_RB;
kvm_patch_ins_mtsrin(inst, inst_rt, inst_rb);
}
break;
#endif
}
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_wrtee(inst, 0, 1);
break;
#endif
}
}
extern u32 kvm_template_start[];
extern u32 kvm_template_end[];
static void __init kvm_use_magic_page(void)
{
u32 *p;
u32 *start, *end;
u32 features;
/* Tell the host to map the magic page to -4096 on all CPUs */
on_each_cpu(kvm_map_magic_page, &features, 1);
/* Quick self-test to see if the mapping works */
if (fault_in_readable((const char __user *)KVM_MAGIC_PAGE,
sizeof(u32))) {
kvm_patching_worked = false;
return;
}
/* Now loop through all code and find instructions */
start = (void*)_stext;
end = (void*)_etext;
/*
* 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");
}
static int __init kvm_guest_init(void)
{
if (!kvm_para_available())
return 0;
if (!epapr_paravirt_enabled)
return 0;
if (kvm_para_has_feature(KVM_FEATURE_MAGIC_PAGE))
kvm_use_magic_page();
#ifdef CONFIG_PPC_BOOK3S_64
/* Enable napping */
powersave_nap = 1;
#endif
return 0;
}
postcore_initcall(kvm_guest_init);
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