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linux_dsm_epyc7002/arch/powerpc/kernel/kvm_emul.S
Thomas Gleixner d94d71cb45 treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 266 
Based on 1 normalized pattern(s):

  this program is free software you can redistribute it and or modify
  it under the terms of the gnu general public license version 2 as
  published by the free software foundation this program is
  distributed in the hope that it will be useful but without any
  warranty without even the implied warranty of merchantability or
  fitness for a particular purpose see the gnu general public license
  for more details you should have received a copy of the gnu general
  public license along with this program if not write to the free
  software foundation 51 franklin street fifth floor boston ma 02110
  1301 usa

extracted by the scancode license scanner the SPDX license identifier

  GPL-2.0-only

has been chosen to replace the boilerplate/reference in 67 file(s).

Signed-off-by: Thomas Gleixner <tglx@linutronix.de>
Reviewed-by: Allison Randal <allison@lohutok.net>
Reviewed-by: Richard Fontana <rfontana@redhat.com>
Reviewed-by: Alexios Zavras <alexios.zavras@intel.com>
Cc: linux-spdx@vger.kernel.org
Link: https://lkml.kernel.org/r/20190529141333.953658117@linutronix.de
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
2019-06-05 17:30:28 +02:00

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/* SPDX-License-Identifier: GPL-2.0-only */
/*
*
* Copyright SUSE Linux Products GmbH 2010
* Copyright 2010-2011 Freescale Semiconductor, Inc.
*
* Authors: Alexander Graf <agraf@suse.de>
*/
#include <asm/ppc_asm.h>
#include <asm/kvm_asm.h>
#include <asm/reg.h>
#include <asm/page.h>
#include <asm/asm-offsets.h>
#include <asm/asm-compat.h>
#define KVM_MAGIC_PAGE (-4096)
#ifdef CONFIG_64BIT
#define LL64(reg, offs, reg2) ld reg, (offs)(reg2)
#define STL64(reg, offs, reg2) std reg, (offs)(reg2)
#else
#define LL64(reg, offs, reg2) lwz reg, (offs + 4)(reg2)
#define STL64(reg, offs, reg2) stw reg, (offs + 4)(reg2)
#endif
#define SCRATCH_SAVE \
/* Enable critical section. We are critical if \
shared->critical == r1 */ \
STL64(r1, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0); \
\
/* Save state */ \
PPC_STL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
PPC_STL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
mfcr r31; \
stw r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0);
#define SCRATCH_RESTORE \
/* Restore state */ \
PPC_LL r31, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH1)(0); \
lwz r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH3)(0); \
mtcr r30; \
PPC_LL r30, (KVM_MAGIC_PAGE + KVM_MAGIC_SCRATCH2)(0); \
\
/* Disable critical section. We are critical if \
shared->critical == r1 and r2 is always != r1 */ \
STL64(r2, KVM_MAGIC_PAGE + KVM_MAGIC_CRITICAL, 0);
.global kvm_template_start
kvm_template_start:
.global kvm_emulate_mtmsrd
kvm_emulate_mtmsrd:
SCRATCH_SAVE
/* Put MSR & ~(MSR_EE|MSR_RI) in r31 */
LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
lis r30, (~(MSR_EE | MSR_RI))@h
ori r30, r30, (~(MSR_EE | MSR_RI))@l
and r31, r31, r30
/* OR the register's (MSR_EE|MSR_RI) on MSR */
kvm_emulate_mtmsrd_reg:
ori r30, r0, 0
andi. r30, r30, (MSR_EE|MSR_RI)
or r31, r31, r30
/* Put MSR back into magic page */
STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
/* Check if we have to fetch an interrupt */
lwz r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0)
cmpwi r31, 0
beq+ no_check
/* Check if we may trigger an interrupt */
andi. r30, r30, MSR_EE
beq no_check
SCRATCH_RESTORE
/* Nag hypervisor */
kvm_emulate_mtmsrd_orig_ins:
tlbsync
b kvm_emulate_mtmsrd_branch
no_check:
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_mtmsrd_branch:
b .
kvm_emulate_mtmsrd_end:
.global kvm_emulate_mtmsrd_branch_offs
kvm_emulate_mtmsrd_branch_offs:
.long (kvm_emulate_mtmsrd_branch - kvm_emulate_mtmsrd) / 4
.global kvm_emulate_mtmsrd_reg_offs
kvm_emulate_mtmsrd_reg_offs:
.long (kvm_emulate_mtmsrd_reg - kvm_emulate_mtmsrd) / 4
.global kvm_emulate_mtmsrd_orig_ins_offs
kvm_emulate_mtmsrd_orig_ins_offs:
.long (kvm_emulate_mtmsrd_orig_ins - kvm_emulate_mtmsrd) / 4
.global kvm_emulate_mtmsrd_len
kvm_emulate_mtmsrd_len:
.long (kvm_emulate_mtmsrd_end - kvm_emulate_mtmsrd) / 4
#define MSR_SAFE_BITS (MSR_EE | MSR_RI)
#define MSR_CRITICAL_BITS ~MSR_SAFE_BITS
.global kvm_emulate_mtmsr
kvm_emulate_mtmsr:
SCRATCH_SAVE
/* Fetch old MSR in r31 */
LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
/* Find the changed bits between old and new MSR */
kvm_emulate_mtmsr_reg1:
ori r30, r0, 0
xor r31, r30, r31
/* Check if we need to really do mtmsr */
LOAD_REG_IMMEDIATE(r30, MSR_CRITICAL_BITS)
and. r31, r31, r30
/* No critical bits changed? Maybe we can stay in the guest. */
beq maybe_stay_in_guest
do_mtmsr:
SCRATCH_RESTORE
/* Just fire off the mtmsr if it's critical */
kvm_emulate_mtmsr_orig_ins:
mtmsr r0
b kvm_emulate_mtmsr_branch
maybe_stay_in_guest:
/* Get the target register in r30 */
kvm_emulate_mtmsr_reg2:
ori r30, r0, 0
/* Put MSR into magic page because we don't call mtmsr */
STL64(r30, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
/* Check if we have to fetch an interrupt */
lwz r31, (KVM_MAGIC_PAGE + KVM_MAGIC_INT)(0)
cmpwi r31, 0
beq+ no_mtmsr
/* Check if we may trigger an interrupt */
andi. r31, r30, MSR_EE
bne do_mtmsr
no_mtmsr:
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_mtmsr_branch:
b .
kvm_emulate_mtmsr_end:
.global kvm_emulate_mtmsr_branch_offs
kvm_emulate_mtmsr_branch_offs:
.long (kvm_emulate_mtmsr_branch - kvm_emulate_mtmsr) / 4
.global kvm_emulate_mtmsr_reg1_offs
kvm_emulate_mtmsr_reg1_offs:
.long (kvm_emulate_mtmsr_reg1 - kvm_emulate_mtmsr) / 4
.global kvm_emulate_mtmsr_reg2_offs
kvm_emulate_mtmsr_reg2_offs:
.long (kvm_emulate_mtmsr_reg2 - kvm_emulate_mtmsr) / 4
.global kvm_emulate_mtmsr_orig_ins_offs
kvm_emulate_mtmsr_orig_ins_offs:
.long (kvm_emulate_mtmsr_orig_ins - kvm_emulate_mtmsr) / 4
.global kvm_emulate_mtmsr_len
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)
/* 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 */
rlwinm r31, r31, 0, ~MSR_EE
/* Write new MSR value back */
STL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_wrteei_0_branch:
b .
kvm_emulate_wrteei_0_end:
.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:
SCRATCH_SAVE
LL64(r31, KVM_MAGIC_PAGE + KVM_MAGIC_MSR, 0)
andi. r31, r31, MSR_DR | MSR_IR
beq kvm_emulate_mtsrin_reg1
SCRATCH_RESTORE
kvm_emulate_mtsrin_orig_ins:
nop
b kvm_emulate_mtsrin_branch
kvm_emulate_mtsrin_reg1:
/* rX >> 26 */
rlwinm r30,r0,6,26,29
kvm_emulate_mtsrin_reg2:
stw r0, (KVM_MAGIC_PAGE + KVM_MAGIC_SR)(r30)
SCRATCH_RESTORE
/* Go back to caller */
kvm_emulate_mtsrin_branch:
b .
kvm_emulate_mtsrin_end:
.global kvm_emulate_mtsrin_branch_offs
kvm_emulate_mtsrin_branch_offs:
.long (kvm_emulate_mtsrin_branch - kvm_emulate_mtsrin) / 4
.global kvm_emulate_mtsrin_reg1_offs
kvm_emulate_mtsrin_reg1_offs:
.long (kvm_emulate_mtsrin_reg1 - kvm_emulate_mtsrin) / 4
.global kvm_emulate_mtsrin_reg2_offs
kvm_emulate_mtsrin_reg2_offs:
.long (kvm_emulate_mtsrin_reg2 - kvm_emulate_mtsrin) / 4
.global kvm_emulate_mtsrin_orig_ins_offs
kvm_emulate_mtsrin_orig_ins_offs:
.long (kvm_emulate_mtsrin_orig_ins - kvm_emulate_mtsrin) / 4
.global kvm_emulate_mtsrin_len
kvm_emulate_mtsrin_len:
.long (kvm_emulate_mtsrin_end - kvm_emulate_mtsrin) / 4
.global kvm_template_end
kvm_template_end:
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