mirror of
https://github.com/torvalds/linux
synced 2024-11-05 18:23:50 +00:00
50c8308538
Currently, the following instructions are translated: - CACHE (indexed) - CACHE (va based): translated to a SYNCI, overkill on D-CACHE operations, but still much faster than a trap. - mfc0/mtc0: the virtual COP0 registers for the guest are implemented as 2-D array. [COP#][SEL] and this is mapped into the guest kernel address space @ VA 0x0. mfc0/mtc0 operations are transformed to load/stores. Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
149 lines
3.9 KiB
C
149 lines
3.9 KiB
C
/*
|
|
* This file is subject to the terms and conditions of the GNU General Public
|
|
* License. See the file "COPYING" in the main directory of this archive
|
|
* for more details.
|
|
*
|
|
* KVM/MIPS: Binary Patching for privileged instructions, reduces traps.
|
|
*
|
|
* Copyright (C) 2012 MIPS Technologies, Inc. All rights reserved.
|
|
* Authors: Sanjay Lal <sanjayl@kymasys.com>
|
|
*/
|
|
|
|
#include <linux/errno.h>
|
|
#include <linux/err.h>
|
|
#include <linux/kvm_host.h>
|
|
#include <linux/module.h>
|
|
#include <linux/vmalloc.h>
|
|
#include <linux/fs.h>
|
|
#include <linux/bootmem.h>
|
|
|
|
#include "kvm_mips_comm.h"
|
|
|
|
#define SYNCI_TEMPLATE 0x041f0000
|
|
#define SYNCI_BASE(x) (((x) >> 21) & 0x1f)
|
|
#define SYNCI_OFFSET ((x) & 0xffff)
|
|
|
|
#define LW_TEMPLATE 0x8c000000
|
|
#define CLEAR_TEMPLATE 0x00000020
|
|
#define SW_TEMPLATE 0xac000000
|
|
|
|
int
|
|
kvm_mips_trans_cache_index(uint32_t inst, uint32_t *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
int result = 0;
|
|
unsigned long kseg0_opc;
|
|
uint32_t synci_inst = 0x0;
|
|
|
|
/* Replace the CACHE instruction, with a NOP */
|
|
kseg0_opc =
|
|
CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
|
|
(vcpu, (unsigned long) opc));
|
|
memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t));
|
|
mips32_SyncICache(kseg0_opc, 32);
|
|
|
|
return result;
|
|
}
|
|
|
|
/*
|
|
* Address based CACHE instructions are transformed into synci(s). A little heavy
|
|
* for just D-cache invalidates, but avoids an expensive trap
|
|
*/
|
|
int
|
|
kvm_mips_trans_cache_va(uint32_t inst, uint32_t *opc,
|
|
struct kvm_vcpu *vcpu)
|
|
{
|
|
int result = 0;
|
|
unsigned long kseg0_opc;
|
|
uint32_t synci_inst = SYNCI_TEMPLATE, base, offset;
|
|
|
|
base = (inst >> 21) & 0x1f;
|
|
offset = inst & 0xffff;
|
|
synci_inst |= (base << 21);
|
|
synci_inst |= offset;
|
|
|
|
kseg0_opc =
|
|
CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
|
|
(vcpu, (unsigned long) opc));
|
|
memcpy((void *)kseg0_opc, (void *)&synci_inst, sizeof(uint32_t));
|
|
mips32_SyncICache(kseg0_opc, 32);
|
|
|
|
return result;
|
|
}
|
|
|
|
int
|
|
kvm_mips_trans_mfc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu)
|
|
{
|
|
int32_t rt, rd, sel;
|
|
uint32_t mfc0_inst;
|
|
unsigned long kseg0_opc, flags;
|
|
|
|
rt = (inst >> 16) & 0x1f;
|
|
rd = (inst >> 11) & 0x1f;
|
|
sel = inst & 0x7;
|
|
|
|
if ((rd == MIPS_CP0_ERRCTL) && (sel == 0)) {
|
|
mfc0_inst = CLEAR_TEMPLATE;
|
|
mfc0_inst |= ((rt & 0x1f) << 16);
|
|
} else {
|
|
mfc0_inst = LW_TEMPLATE;
|
|
mfc0_inst |= ((rt & 0x1f) << 16);
|
|
mfc0_inst |=
|
|
offsetof(struct mips_coproc,
|
|
reg[rd][sel]) + offsetof(struct kvm_mips_commpage,
|
|
cop0);
|
|
}
|
|
|
|
if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
|
|
kseg0_opc =
|
|
CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
|
|
(vcpu, (unsigned long) opc));
|
|
memcpy((void *)kseg0_opc, (void *)&mfc0_inst, sizeof(uint32_t));
|
|
mips32_SyncICache(kseg0_opc, 32);
|
|
} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
|
|
local_irq_save(flags);
|
|
memcpy((void *)opc, (void *)&mfc0_inst, sizeof(uint32_t));
|
|
mips32_SyncICache((unsigned long) opc, 32);
|
|
local_irq_restore(flags);
|
|
} else {
|
|
kvm_err("%s: Invalid address: %p\n", __func__, opc);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
kvm_mips_trans_mtc0(uint32_t inst, uint32_t *opc, struct kvm_vcpu *vcpu)
|
|
{
|
|
int32_t rt, rd, sel;
|
|
uint32_t mtc0_inst = SW_TEMPLATE;
|
|
unsigned long kseg0_opc, flags;
|
|
|
|
rt = (inst >> 16) & 0x1f;
|
|
rd = (inst >> 11) & 0x1f;
|
|
sel = inst & 0x7;
|
|
|
|
mtc0_inst |= ((rt & 0x1f) << 16);
|
|
mtc0_inst |=
|
|
offsetof(struct mips_coproc,
|
|
reg[rd][sel]) + offsetof(struct kvm_mips_commpage, cop0);
|
|
|
|
if (KVM_GUEST_KSEGX(opc) == KVM_GUEST_KSEG0) {
|
|
kseg0_opc =
|
|
CKSEG0ADDR(kvm_mips_translate_guest_kseg0_to_hpa
|
|
(vcpu, (unsigned long) opc));
|
|
memcpy((void *)kseg0_opc, (void *)&mtc0_inst, sizeof(uint32_t));
|
|
mips32_SyncICache(kseg0_opc, 32);
|
|
} else if (KVM_GUEST_KSEGX((unsigned long) opc) == KVM_GUEST_KSEG23) {
|
|
local_irq_save(flags);
|
|
memcpy((void *)opc, (void *)&mtc0_inst, sizeof(uint32_t));
|
|
mips32_SyncICache((unsigned long) opc, 32);
|
|
local_irq_restore(flags);
|
|
} else {
|
|
kvm_err("%s: Invalid address: %p\n", __func__, opc);
|
|
return -EFAULT;
|
|
}
|
|
|
|
return 0;
|
|
}
|