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KVM: PPC: PV wrteei

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On BookE the preferred way to write the EE bit is the wrteei instruction. It
already encodes the EE bit in the instruction.

So in order to get BookE some speedups as well, let's also PV'nize thati
instruction.

Signed-off-by: Alexander Graf <agraf@suse.de>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Alexander Graf 2010-07-29 14:48:06 +02:00 committed by Avi Kivity
parent 7810927760
commit 644bfa013f
2 changed files with 91 additions and 0 deletions
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50
arch/powerpc/kernel/kvm.c
View File

@ -67,6 +67,9 @@
#define KVM_INST_MTMSRD_L1 0x7c010164
#define KVM_INST_MTMSR 0x7c000124
#define KVM_INST_WRTEEI_0 0x7c000146
#define KVM_INST_WRTEEI_1 0x7c008146
static bool kvm_patching_worked = true;
static char kvm_tmp[1024 * 1024];
static int kvm_tmp_index;
@ -221,6 +224,47 @@ static void kvm_patch_ins_mtmsr(u32 *inst, u32 rt)
kvm_patch_ins_b(inst, distance_start);
}
#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[];
static void kvm_patch_ins_wrteei(u32 *inst)
{
u32 *p;
int distance_start;
int distance_end;
ulong next_inst;
p = kvm_alloc(kvm_emulate_wrteei_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];
/* 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_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);
/* Patch the invocation */
kvm_patch_ins_b(inst, distance_start);
}
#endif
static void kvm_map_magic_page(void *data)
{
kvm_hypercall2(KVM_HC_PPC_MAP_MAGIC_PAGE,
@ -310,6 +354,12 @@ static void kvm_check_ins(u32 *inst)
}
switch (_inst) {
#ifdef CONFIG_BOOKE
case KVM_INST_WRTEEI_0:
case KVM_INST_WRTEEI_1:
kvm_patch_ins_wrteei(inst);
break;
#endif
}
}

41
arch/powerpc/kernel/kvm_emul.S
View File

@ -204,3 +204,44 @@ kvm_emulate_mtmsr_orig_ins_offs:
.global kvm_emulate_mtmsr_len
kvm_emulate_mtmsr_len:
.long (kvm_emulate_mtmsr_end - kvm_emulate_mtmsr) / 4
.global kvm_emulate_wrteei
kvm_emulate_wrteei:
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
/* OR new MSR_EE onto the old MSR */
kvm_emulate_wrteei_ee:
ori r31, r31, 0
/* Write new MSR value back */
STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_wrteei_branch:
b .
kvm_emulate_wrteei_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