diff options
Diffstat (limited to 'arch/powerpc/kernel/kvm_emul.S')
| -rw-r--r-- | arch/powerpc/kernel/kvm_emul.S | 96 |
1 files changed, 74 insertions, 22 deletions
diff --git a/arch/powerpc/kernel/kvm_emul.S b/arch/powerpc/kernel/kvm_emul.S index 3d64c5704fd5..801058dd74db 100644 --- a/arch/powerpc/kernel/kvm_emul.S +++ b/arch/powerpc/kernel/kvm_emul.S @@ -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 +/* 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) -.global kvm_emulate_wrteei -kvm_emulate_wrteei: + /* Insert new MSR[EE] */ +kvm_emulate_wrtee_reg: + ori r30, r0, 0 + rlwimi r31, r30, 0, MSR_EE + + /* + * 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 */ - 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 + 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: - -.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 +kvm_emulate_wrteei_0_end: -.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: |
