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https://github.com/FEX-Emu/linux.git
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KVM: Portability: Move x86 FPU handling to x86.c
Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com> Signed-off-by: Avi Kivity <avi@qumranet.com>
This commit is contained in:
Hollis Blanchard
Avi Kivity
parent
8776e5194f
commit
d075206073
@ -633,6 +633,9 @@ long kvm_arch_vm_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg);
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void kvm_arch_destroy_vm(struct kvm *kvm);
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int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
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int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu);
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__init void kvm_arch_init(void);
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static inline void kvm_guest_enter(void)
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@ -73,28 +73,6 @@ static inline int valid_vcpu(int n)
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return likely(n >= 0 && n < KVM_MAX_VCPUS);
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}
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void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
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{
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if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
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return;
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vcpu->guest_fpu_loaded = 1;
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fx_save(&vcpu->host_fx_image);
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fx_restore(&vcpu->guest_fx_image);
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}
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EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
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void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
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{
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if (!vcpu->guest_fpu_loaded)
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return;
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vcpu->guest_fpu_loaded = 0;
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fx_save(&vcpu->guest_fx_image);
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fx_restore(&vcpu->host_fx_image);
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}
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EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
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/*
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* Switches to specified vcpu, until a matching vcpu_put()
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*/
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@ -294,26 +272,6 @@ static int kvm_vm_release(struct inode *inode, struct file *filp)
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return 0;
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}
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void fx_init(struct kvm_vcpu *vcpu)
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{
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unsigned after_mxcsr_mask;
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/* Initialize guest FPU by resetting ours and saving into guest's */
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preempt_disable();
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fx_save(&vcpu->host_fx_image);
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fpu_init();
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fx_save(&vcpu->guest_fx_image);
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fx_restore(&vcpu->host_fx_image);
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preempt_enable();
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vcpu->cr0 |= X86_CR0_ET;
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after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
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vcpu->guest_fx_image.mxcsr = 0x1f80;
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memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
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0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
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}
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EXPORT_SYMBOL_GPL(fx_init);
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/*
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* Allocate some memory and give it an address in the guest physical address
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* space.
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@ -1422,67 +1380,6 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset)
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return 0;
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}
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/*
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* fxsave fpu state. Taken from x86_64/processor.h. To be killed when
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* we have asm/x86/processor.h
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*/
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struct fxsave {
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u16 cwd;
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u16 swd;
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u16 twd;
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u16 fop;
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u64 rip;
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u64 rdp;
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u32 mxcsr;
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u32 mxcsr_mask;
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u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
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#ifdef CONFIG_X86_64
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u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
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#else
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u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
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#endif
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};
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static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
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vcpu_load(vcpu);
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memcpy(fpu->fpr, fxsave->st_space, 128);
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fpu->fcw = fxsave->cwd;
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fpu->fsw = fxsave->swd;
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fpu->ftwx = fxsave->twd;
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fpu->last_opcode = fxsave->fop;
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fpu->last_ip = fxsave->rip;
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fpu->last_dp = fxsave->rdp;
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memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
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vcpu_put(vcpu);
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return 0;
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}
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static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
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vcpu_load(vcpu);
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memcpy(fxsave->st_space, fpu->fpr, 128);
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fxsave->cwd = fpu->fcw;
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fxsave->swd = fpu->fsw;
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fxsave->twd = fpu->ftwx;
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fxsave->fop = fpu->last_opcode;
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fxsave->rip = fpu->last_ip;
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fxsave->rdp = fpu->last_dp;
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memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
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vcpu_put(vcpu);
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return 0;
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}
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static long kvm_vcpu_ioctl(struct file *filp,
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unsigned int ioctl, unsigned long arg)
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{
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@ -1613,7 +1510,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
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struct kvm_fpu fpu;
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memset(&fpu, 0, sizeof fpu);
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r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu);
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r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu);
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if (r)
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goto out;
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r = -EFAULT;
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@ -1628,7 +1525,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
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r = -EFAULT;
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if (copy_from_user(&fpu, argp, sizeof fpu))
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goto out;
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r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu);
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r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu);
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if (r)
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goto out;
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r = 0;
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@ -1785,3 +1785,106 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu)
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kvm_x86_ops->skip_emulated_instruction(vcpu);
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}
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EXPORT_SYMBOL_GPL(kvm_emulate_cpuid);
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/*
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* fxsave fpu state. Taken from x86_64/processor.h. To be killed when
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* we have asm/x86/processor.h
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*/
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struct fxsave {
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u16 cwd;
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u16 swd;
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u16 twd;
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u16 fop;
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u64 rip;
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u64 rdp;
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u32 mxcsr;
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u32 mxcsr_mask;
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u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */
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#ifdef CONFIG_X86_64
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u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */
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#else
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u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */
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#endif
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};
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int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
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vcpu_load(vcpu);
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memcpy(fpu->fpr, fxsave->st_space, 128);
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fpu->fcw = fxsave->cwd;
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fpu->fsw = fxsave->swd;
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fpu->ftwx = fxsave->twd;
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fpu->last_opcode = fxsave->fop;
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fpu->last_ip = fxsave->rip;
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fpu->last_dp = fxsave->rdp;
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memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
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vcpu_put(vcpu);
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return 0;
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}
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int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
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{
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struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image;
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vcpu_load(vcpu);
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memcpy(fxsave->st_space, fpu->fpr, 128);
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fxsave->cwd = fpu->fcw;
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fxsave->swd = fpu->fsw;
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fxsave->twd = fpu->ftwx;
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fxsave->fop = fpu->last_opcode;
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fxsave->rip = fpu->last_ip;
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fxsave->rdp = fpu->last_dp;
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memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space);
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vcpu_put(vcpu);
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return 0;
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}
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void fx_init(struct kvm_vcpu *vcpu)
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{
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unsigned after_mxcsr_mask;
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/* Initialize guest FPU by resetting ours and saving into guest's */
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preempt_disable();
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fx_save(&vcpu->host_fx_image);
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fpu_init();
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fx_save(&vcpu->guest_fx_image);
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fx_restore(&vcpu->host_fx_image);
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preempt_enable();
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vcpu->cr0 |= X86_CR0_ET;
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after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space);
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vcpu->guest_fx_image.mxcsr = 0x1f80;
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memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask,
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0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask);
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}
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EXPORT_SYMBOL_GPL(fx_init);
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void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
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{
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if (!vcpu->fpu_active || vcpu->guest_fpu_loaded)
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return;
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vcpu->guest_fpu_loaded = 1;
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fx_save(&vcpu->host_fx_image);
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fx_restore(&vcpu->guest_fx_image);
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}
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EXPORT_SYMBOL_GPL(kvm_load_guest_fpu);
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void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
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{
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if (!vcpu->guest_fpu_loaded)
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return;
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vcpu->guest_fpu_loaded = 0;
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fx_save(&vcpu->guest_fx_image);
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fx_restore(&vcpu->host_fx_image);
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}
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EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);
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