mirror of
https://git.kernel.org/pub/scm/linux/kernel/git/stable/linux.git
synced 2024-09-22 10:31:08 +00:00
LoongArch: KVM: Implement basic vcpu ioctl interfaces
Implement basic vcpu ioctl interfaces, including: 1, vcpu KVM_ENABLE_CAP ioctl interface. 2, vcpu get registers and set registers operations, it is called when user space use the ioctl interface to get or set regs. Reviewed-by: Bibo Mao <maobibo@loongson.cn> Tested-by: Huacai Chen <chenhuacai@loongson.cn> Signed-off-by: Tianrui Zhao <zhaotianrui@loongson.cn> Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Tianrui Zhao
Huacai Chen
parent
2fc3bd86db
commit
f6deff355b
1 changed files with 261 additions and 0 deletions
|
|
@ -141,6 +141,267 @@ static int kvm_handle_exit(struct kvm_run *run, struct kvm_vcpu *vcpu)
|
|||
return RESUME_GUEST;
|
||||
}
|
||||
|
||||
static int _kvm_getcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 *val)
|
||||
{
|
||||
unsigned long gintc;
|
||||
struct loongarch_csrs *csr = vcpu->arch.csr;
|
||||
|
||||
if (get_gcsr_flag(id) & INVALID_GCSR)
|
||||
return -EINVAL;
|
||||
|
||||
if (id == LOONGARCH_CSR_ESTAT) {
|
||||
/* ESTAT IP0~IP7 get from GINTC */
|
||||
gintc = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_GINTC) & 0xff;
|
||||
*val = kvm_read_sw_gcsr(csr, LOONGARCH_CSR_ESTAT) | (gintc << 2);
|
||||
return 0;
|
||||
}
|
||||
|
||||
/*
|
||||
* Get software CSR state since software state is consistent
|
||||
* with hardware for synchronous ioctl
|
||||
*/
|
||||
*val = kvm_read_sw_gcsr(csr, id);
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int _kvm_setcsr(struct kvm_vcpu *vcpu, unsigned int id, u64 val)
|
||||
{
|
||||
int ret = 0, gintc;
|
||||
struct loongarch_csrs *csr = vcpu->arch.csr;
|
||||
|
||||
if (get_gcsr_flag(id) & INVALID_GCSR)
|
||||
return -EINVAL;
|
||||
|
||||
if (id == LOONGARCH_CSR_ESTAT) {
|
||||
/* ESTAT IP0~IP7 inject through GINTC */
|
||||
gintc = (val >> 2) & 0xff;
|
||||
kvm_set_sw_gcsr(csr, LOONGARCH_CSR_GINTC, gintc);
|
||||
|
||||
gintc = val & ~(0xffUL << 2);
|
||||
kvm_set_sw_gcsr(csr, LOONGARCH_CSR_ESTAT, gintc);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
kvm_write_sw_gcsr(csr, id, val);
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int kvm_get_one_reg(struct kvm_vcpu *vcpu,
|
||||
const struct kvm_one_reg *reg, u64 *v)
|
||||
{
|
||||
int id, ret = 0;
|
||||
u64 type = reg->id & KVM_REG_LOONGARCH_MASK;
|
||||
|
||||
switch (type) {
|
||||
case KVM_REG_LOONGARCH_CSR:
|
||||
id = KVM_GET_IOC_CSR_IDX(reg->id);
|
||||
ret = _kvm_getcsr(vcpu, id, v);
|
||||
break;
|
||||
case KVM_REG_LOONGARCH_CPUCFG:
|
||||
id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
|
||||
if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
|
||||
*v = vcpu->arch.cpucfg[id];
|
||||
else
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
case KVM_REG_LOONGARCH_KVM:
|
||||
switch (reg->id) {
|
||||
case KVM_REG_LOONGARCH_COUNTER:
|
||||
*v = drdtime() + vcpu->kvm->arch.time_offset;
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int kvm_get_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
|
||||
{
|
||||
int ret = 0;
|
||||
u64 v, size = reg->id & KVM_REG_SIZE_MASK;
|
||||
|
||||
switch (size) {
|
||||
case KVM_REG_SIZE_U64:
|
||||
ret = kvm_get_one_reg(vcpu, reg, &v);
|
||||
if (ret)
|
||||
return ret;
|
||||
ret = put_user(v, (u64 __user *)(long)reg->addr);
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int kvm_set_one_reg(struct kvm_vcpu *vcpu,
|
||||
const struct kvm_one_reg *reg, u64 v)
|
||||
{
|
||||
int id, ret = 0;
|
||||
u64 type = reg->id & KVM_REG_LOONGARCH_MASK;
|
||||
|
||||
switch (type) {
|
||||
case KVM_REG_LOONGARCH_CSR:
|
||||
id = KVM_GET_IOC_CSR_IDX(reg->id);
|
||||
ret = _kvm_setcsr(vcpu, id, v);
|
||||
break;
|
||||
case KVM_REG_LOONGARCH_CPUCFG:
|
||||
id = KVM_GET_IOC_CPUCFG_IDX(reg->id);
|
||||
if (id >= 0 && id < KVM_MAX_CPUCFG_REGS)
|
||||
vcpu->arch.cpucfg[id] = (u32)v;
|
||||
else
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
case KVM_REG_LOONGARCH_KVM:
|
||||
switch (reg->id) {
|
||||
case KVM_REG_LOONGARCH_COUNTER:
|
||||
/*
|
||||
* gftoffset is relative with board, not vcpu
|
||||
* only set for the first time for smp system
|
||||
*/
|
||||
if (vcpu->vcpu_id == 0)
|
||||
vcpu->kvm->arch.time_offset = (signed long)(v - drdtime());
|
||||
break;
|
||||
case KVM_REG_LOONGARCH_VCPU_RESET:
|
||||
kvm_reset_timer(vcpu);
|
||||
memset(&vcpu->arch.irq_pending, 0, sizeof(vcpu->arch.irq_pending));
|
||||
memset(&vcpu->arch.irq_clear, 0, sizeof(vcpu->arch.irq_clear));
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
break;
|
||||
default:
|
||||
ret = -EINVAL;
|
||||
break;
|
||||
}
|
||||
|
||||
return ret;
|
||||
}
|
||||
|
||||
static int kvm_set_reg(struct kvm_vcpu *vcpu, const struct kvm_one_reg *reg)
|
||||
{
|
||||
int ret = 0;
|
||||
u64 v, size = reg->id & KVM_REG_SIZE_MASK;
|
||||
|
||||
switch (size) {
|
||||
case KVM_REG_SIZE_U64:
|
||||
ret = get_user(v, (u64 __user *)(long)reg->addr);
|
||||
if (ret)
|
||||
return ret;
|
||||
break;
|
||||
default:
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
return kvm_set_one_reg(vcpu, reg, v);
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_get_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
|
||||
{
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_set_sregs(struct kvm_vcpu *vcpu, struct kvm_sregs *sregs)
|
||||
{
|
||||
return -ENOIOCTLCMD;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_get_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 0; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
|
||||
regs->gpr[i] = vcpu->arch.gprs[i];
|
||||
|
||||
regs->pc = vcpu->arch.pc;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_ioctl_set_regs(struct kvm_vcpu *vcpu, struct kvm_regs *regs)
|
||||
{
|
||||
int i;
|
||||
|
||||
for (i = 1; i < ARRAY_SIZE(vcpu->arch.gprs); i++)
|
||||
vcpu->arch.gprs[i] = regs->gpr[i];
|
||||
|
||||
vcpu->arch.gprs[0] = 0; /* zero is special, and cannot be set. */
|
||||
vcpu->arch.pc = regs->pc;
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
static int kvm_vcpu_ioctl_enable_cap(struct kvm_vcpu *vcpu,
|
||||
struct kvm_enable_cap *cap)
|
||||
{
|
||||
/* FPU is enabled by default, will support LSX/LASX later. */
|
||||
return -EINVAL;
|
||||
}
|
||||
|
||||
long kvm_arch_vcpu_ioctl(struct file *filp,
|
||||
unsigned int ioctl, unsigned long arg)
|
||||
{
|
||||
long r;
|
||||
void __user *argp = (void __user *)arg;
|
||||
struct kvm_vcpu *vcpu = filp->private_data;
|
||||
|
||||
/*
|
||||
* Only software CSR should be modified
|
||||
*
|
||||
* If any hardware CSR register is modified, vcpu_load/vcpu_put pair
|
||||
* should be used. Since CSR registers owns by this vcpu, if switch
|
||||
* to other vcpus, other vcpus need reload CSR registers.
|
||||
*
|
||||
* If software CSR is modified, bit KVM_LARCH_HWCSR_USABLE should
|
||||
* be clear in vcpu->arch.aux_inuse, and vcpu_load will check
|
||||
* aux_inuse flag and reload CSR registers form software.
|
||||
*/
|
||||
|
||||
switch (ioctl) {
|
||||
case KVM_SET_ONE_REG:
|
||||
case KVM_GET_ONE_REG: {
|
||||
struct kvm_one_reg reg;
|
||||
|
||||
r = -EFAULT;
|
||||
if (copy_from_user(®, argp, sizeof(reg)))
|
||||
break;
|
||||
if (ioctl == KVM_SET_ONE_REG) {
|
||||
r = kvm_set_reg(vcpu, ®);
|
||||
vcpu->arch.aux_inuse &= ~KVM_LARCH_HWCSR_USABLE;
|
||||
} else
|
||||
r = kvm_get_reg(vcpu, ®);
|
||||
break;
|
||||
}
|
||||
case KVM_ENABLE_CAP: {
|
||||
struct kvm_enable_cap cap;
|
||||
|
||||
r = -EFAULT;
|
||||
if (copy_from_user(&cap, argp, sizeof(cap)))
|
||||
break;
|
||||
r = kvm_vcpu_ioctl_enable_cap(vcpu, &cap);
|
||||
break;
|
||||
}
|
||||
default:
|
||||
r = -ENOIOCTLCMD;
|
||||
break;
|
||||
}
|
||||
|
||||
return r;
|
||||
}
|
||||
|
||||
int kvm_arch_vcpu_precreate(struct kvm *kvm, unsigned int id)
|
||||
{
|
||||
return 0;
|
||||
|
|
|
|||
Loading…
Reference in a new issue