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LoongArch: KVM: Fix FPU register width with user access API

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At the beginning, only 64 bit FPU is supported. With FPU register get
interface, 64 bit FPU data is copied to user space, the same with FPU
register set API. However with LSX and LASX supported in later, there
should be FPU data copied with bigger width. So here fixes this issue,
copy the whole 256 bit FPU data from/to user space.

Cc: stable@vger.kernel.org
Fixes: db1ecca22e ("LoongArch: KVM: Add LSX (128bit SIMD) support")
Signed-off-by: Bibo Mao <maobibo@loongson.cn>
Signed-off-by: Huacai Chen <chenhuacai@loongson.cn>
This commit is contained in:
Bibo Mao 2026-06-11 20:46:40 +08:00 committed by Huacai Chen
parent 848c55a2c9
commit f4caaac763
1 changed files with 2 additions and 2 deletions
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4
arch/loongarch/kvm/vcpu.c
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@ -1303,7 +1303,7 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
fpu->fcc = vcpu->arch.fpu.fcc;
fpu->fcsr = vcpu->arch.fpu.fcsr;
for (i = 0; i < NUM_FPU_REGS; i++)
memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], FPU_REG_WIDTH / 64);
memcpy(&fpu->fpr[i], &vcpu->arch.fpu.fpr[i], sizeof(union fpureg));
return 0;
}
@ -1315,7 +1315,7 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
vcpu->arch.fpu.fcc = fpu->fcc;
vcpu->arch.fpu.fcsr = fpu->fcsr;
for (i = 0; i < NUM_FPU_REGS; i++)
memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], FPU_REG_WIDTH / 64);
memcpy(&vcpu->arch.fpu.fpr[i], &fpu->fpr[i], sizeof(union fpureg));
return 0;
}