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KVM: PPC: booke: Paravirtualize wrtee

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Also fix wrteei 1 paravirt to check for a pending interrupt.

Signed-off-by: Scott Wood <scottwood@freescale.com>
Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Scott Wood 2011-11-08 18:23:28 -06:00 committed by Avi Kivity
parent 29ac26efbd
commit 940b45ec18
2 changed files with 156 additions and 36 deletions
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92
arch/powerpc/kernel/kvm.c
View File

@ -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)
@ -41,6 +43,7 @@
#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
@ -69,6 +72,7 @@
#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 +274,27 @@ 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 +303,65 @@ 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);
@ -444,6 +504,11 @@ 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) {
@ -461,8 +526,11 @@ 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
}

100
arch/powerpc/kernel/kvm_emul.S
View File

@ -13,6 +13,7 @@
* Foundation, 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* Copyright SUSE Linux Products GmbH 2010
* Copyright 2010-2011 Freescale Semiconductor, Inc.
*
* Authors: Alexander Graf <agraf@suse.de>
*/
@ -208,24 +209,80 @@ kvm_emulate_mtmsr_orig_ins_offs:
kvm_emulate_mtmsr_len:
.long (kvm_emulate_mtmsr_end - kvm_emulate_mtmsr) / 4
.global kvm_emulate_wrteei
kvm_emulate_wrteei:
/* also used for wrteei 1 */
.global kvm_emulate_wrtee
kvm_emulate_wrtee:
SCRATCH_SAVE
/* Fetch old MSR in r31 */
LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
/* Remove MSR_EE from old MSR */
li r30, 0
ori r30, r30, MSR_EE
andc r31, r31, r30
/* Insert new MSR[EE] */
kvm_emulate_wrtee_reg:
ori r30, r0, 0
rlwimi r31, r30, 0, MSR_EE
/* OR new MSR_EE onto the old MSR */
kvm_emulate_wrteei_ee:
ori r31, r31, 0
/*
* If MSR[EE] is now set, check for a pending interrupt.
* We could skip this if MSR[EE] was already on, but that
* should be rare, so don't bother.
*/
andi. r30, r30, MSR_EE
/* Put MSR into magic page because we don't call wrtee */
STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
beq no_wrtee
/* Check if we have to fetch an interrupt */
lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0)
cmpwi r30, 0
bne do_wrtee
no_wrtee:
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_wrtee_branch:
b .
do_wrtee:
SCRATCH_RESTORE
/* Just fire off the wrtee if it's critical */
kvm_emulate_wrtee_orig_ins:
wrtee r0
b kvm_emulate_wrtee_branch
kvm_emulate_wrtee_end:
.global kvm_emulate_wrtee_branch_offs
kvm_emulate_wrtee_branch_offs:
.long (kvm_emulate_wrtee_branch - kvm_emulate_wrtee) / 4
.global kvm_emulate_wrtee_reg_offs
kvm_emulate_wrtee_reg_offs:
.long (kvm_emulate_wrtee_reg - kvm_emulate_wrtee) / 4
.global kvm_emulate_wrtee_orig_ins_offs
kvm_emulate_wrtee_orig_ins_offs:
.long (kvm_emulate_wrtee_orig_ins - kvm_emulate_wrtee) / 4
.global kvm_emulate_wrtee_len
kvm_emulate_wrtee_len:
.long (kvm_emulate_wrtee_end - kvm_emulate_wrtee) / 4
.global kvm_emulate_wrteei_0
kvm_emulate_wrteei_0:
SCRATCH_SAVE
/* Fetch old MSR in r31 */
LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
/* Remove MSR_EE from old MSR */
rlwinm r31, r31, 0, ~MSR_EE
/* Write new MSR value back */
STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
@ -233,22 +290,17 @@ kvm_emulate_wrteei_ee:
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_wrteei_branch:
kvm_emulate_wrteei_0_branch:
b .
kvm_emulate_wrteei_end:
kvm_emulate_wrteei_0_end:
.global kvm_emulate_wrteei_branch_offs
kvm_emulate_wrteei_branch_offs:
.long (kvm_emulate_wrteei_branch - kvm_emulate_wrteei) / 4
.global kvm_emulate_wrteei_ee_offs
kvm_emulate_wrteei_ee_offs:
.long (kvm_emulate_wrteei_ee - kvm_emulate_wrteei) / 4
.global kvm_emulate_wrteei_len
kvm_emulate_wrteei_len:
.long (kvm_emulate_wrteei_end - kvm_emulate_wrteei) / 4
.global kvm_emulate_wrteei_0_branch_offs
kvm_emulate_wrteei_0_branch_offs:
.long (kvm_emulate_wrteei_0_branch - kvm_emulate_wrteei_0) / 4
.global kvm_emulate_wrteei_0_len
kvm_emulate_wrteei_0_len:
.long (kvm_emulate_wrteei_0_end - kvm_emulate_wrteei_0) / 4
.global kvm_emulate_mtsrin
kvm_emulate_mtsrin: