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target/loongarch/kvm: Enable LSX/LASX extension 

The kernel had already support LSX and LASX [1],
but QEMU is disable LSX/LASX for kvm. This patch adds
kvm_check_cpucfg2() to check CPUCFG2.

[1]: https://lore.kernel.org/all/CABgObfZHRf7E_7Jk4uPRmSyxTy3EiuuYwHC35jQncNL9s-zTDA@mail.gmail.com/

Signed-off-by: Song Gao <gaosong@loongson.cn>
Reviewed-by: Bibo Mao <maobibo@loongson.cn>
Message-Id: <20240122090206.1083584-1-gaosong@loongson.cn>
master
Song Gao 2024-01-22 17:02:06 +08:00
parent 61f6e1509d
commit fc70099621
2 changed files with 39 additions and 7 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
linux-headers/asm-loongarch/kvm.h
View File

@ -79,6 +79,7 @@ struct kvm_fpu {
#define LOONGARCH_REG_64(TYPE, REG) (TYPE | KVM_REG_SIZE_U64 | (REG << LOONGARCH_REG_SHIFT))
#define KVM_IOC_CSRID(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CSR, REG)
#define KVM_IOC_CPUCFG(REG) LOONGARCH_REG_64(KVM_REG_LOONGARCH_CPUCFG, REG)
#define KVM_LOONGARCH_VCPU_CPUCFG 0
struct kvm_debug_exit_arch {
};

45
target/loongarch/kvm/kvm.c
View File

@ -540,6 +540,38 @@ static int kvm_loongarch_get_cpucfg(CPUState *cs)
return ret;
}
static int kvm_check_cpucfg2(CPUState *cs)
{
int ret;
uint64_t val;
struct kvm_device_attr attr = {
.group = KVM_LOONGARCH_VCPU_CPUCFG,
.attr = 2,
.addr = (uint64_t)&val,
};
LoongArchCPU *cpu = LOONGARCH_CPU(cs);
CPULoongArchState *env = &cpu->env;
ret = kvm_vcpu_ioctl(cs, KVM_HAS_DEVICE_ATTR, &attr);
if (!ret) {
kvm_vcpu_ioctl(cs, KVM_GET_DEVICE_ATTR, &attr);
env->cpucfg[2] &= val;
if (FIELD_EX32(env->cpucfg[2], CPUCFG2, FP)) {
/* The FP minimal version is 1. */
env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, FP_VER, 1);
}
if (FIELD_EX32(env->cpucfg[2], CPUCFG2, LLFTP)) {
/* The LLFTP minimal version is 1. */
env->cpucfg[2] = FIELD_DP32(env->cpucfg[2], CPUCFG2, LLFTP_VER, 1);
}
}
return ret;
}
static int kvm_loongarch_put_cpucfg(CPUState *cs)
{
int i, ret = 0;
@ -548,14 +580,13 @@ static int kvm_loongarch_put_cpucfg(CPUState *cs)
uint64_t val;
for (i = 0; i < 21; i++) {
if (i == 2) {
ret = kvm_check_cpucfg2(cs);
if (ret) {
return ret;
}
}
val = env->cpucfg[i];
/* LSX and LASX and LBT are not supported in kvm now */
if (i == 2) {
val &= ~(BIT(R_CPUCFG2_LSX_SHIFT) | BIT(R_CPUCFG2_LASX_SHIFT));
val &= ~(BIT(R_CPUCFG2_LBT_X86_SHIFT) |
BIT(R_CPUCFG2_LBT_ARM_SHIFT) |
BIT(R_CPUCFG2_LBT_MIPS_SHIFT));
}
ret = kvm_set_one_reg(cs, KVM_IOC_CPUCFG(i), &val);
if (ret < 0) {
trace_kvm_failed_put_cpucfg(strerror(errno));