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HV: instr_emul: Make vie_read/write_bytereg as non-failed function

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vie_read/write_bytereg call vm_get/set_register to get/set byteregs.

We have make vm_get/set_register as non-failed function in previous patch.
So, this patch make the vie_read/write_bytereg as non-failed function too.

Signed-off-by: Kaige Fu <kaige.fu@intel.com>
Acked-by: Eddie Dong <eddie.dong@intel.com>
This commit is contained in:
Kaige Fu 2018-08-06 12:00:04 +08:00 committed by lijinxia
parent 59c0f355c8
commit 12726dbfc9
1 changed files with 24 additions and 27 deletions
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51
hypervisor/arch/x86/guest/instr_emul.c
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@ -597,11 +597,11 @@ static void vie_calc_bytereg(struct instr_emul_vie *vie,
}
}
static int vie_read_bytereg(struct vcpu *vcpu, struct instr_emul_vie *vie,
uint8_t *rval)
static uint8_t vie_read_bytereg(struct vcpu *vcpu, struct instr_emul_vie *vie)
{
int lhbr;
uint64_t val;
int error = 0, lhbr;
uint8_t reg_val;
enum cpu_reg_name reg;
vie_calc_bytereg(vie, &reg, &lhbr);
@ -612,37 +612,36 @@ static int vie_read_bytereg(struct vcpu *vcpu, struct instr_emul_vie *vie,
* base register right by 8 bits (%ah = %rax >> 8).
*/
if (lhbr != 0) {
*rval = (uint8_t)(val >> 8);
reg_val = (uint8_t)(val >> 8);
} else {
*rval = (uint8_t)val;
reg_val = (uint8_t)val;
}
return error;
return reg_val;
}
static int vie_write_bytereg(struct vcpu *vcpu, struct instr_emul_vie *vie,
static void vie_write_bytereg(struct vcpu *vcpu, struct instr_emul_vie *vie,
uint8_t byte)
{
uint64_t origval, val, mask;
int error = 0, lhbr;
enum cpu_reg_name reg;
int lhbr;
vie_calc_bytereg(vie, &reg, &lhbr);
origval = vm_get_register(vcpu, reg);
if (error == 0) {
val = byte;
mask = 0xffU;
if (lhbr != 0) {
/*
* Shift left by 8 to store 'byte' in a legacy high
* byte register.
*/
val <<= 8;
mask <<= 8;
}
val |= origval & ~mask;
vm_set_register(vcpu, reg, val);
val = byte;
mask = 0xffU;
if (lhbr != 0) {
/*
* Shift left by 8 to store 'byte' in a legacy high
* byte register.
*/
val <<= 8;
mask <<= 8;
}
return error;
val |= origval & ~mask;
vm_set_register(vcpu, reg, val);
}
static int vie_update_register(struct vcpu *vcpu, enum cpu_reg_name reg,
@ -744,10 +743,8 @@ static int emulate_mov(struct vcpu *vcpu, struct instr_emul_vie *vie)
* REX + 88/r: mov r/m8, r8 (%ah, %ch, %dh, %bh not available)
*/
size = 1U; /* override for byte operation */
error = vie_read_bytereg(vcpu, vie, &byte);
if (error == 0) {
error = mmio_write(vcpu, byte);
}
byte = vie_read_bytereg(vcpu, vie);
error = mmio_write(vcpu, byte);
break;
case 0x89U:
/*
@ -771,7 +768,7 @@ static int emulate_mov(struct vcpu *vcpu, struct instr_emul_vie *vie)
size = 1U; /* override for byte operation */
error = mmio_read(vcpu, &val);
if (error == 0) {
error = vie_write_bytereg(vcpu, vie, (uint8_t)val);
vie_write_bytereg(vcpu, vie, (uint8_t)val);
}
break;
case 0x8BU: