From: Hollis Blanchard Date: Wed, 31 Oct 2007 22:24:25 +0000 (-0500) Subject: KVM: Portability: Move x86 FPU handling to x86.c X-Git-Url: http://git.lede-project.org./?a=commitdiff_plain;h=d075206073286dca84768137af0a0bf3d11f0663;p=openwrt%2Fstaging%2Fblogic.git KVM: Portability: Move x86 FPU handling to x86.c Signed-off-by: Hollis Blanchard Signed-off-by: Avi Kivity --- diff --git a/drivers/kvm/kvm.h b/drivers/kvm/kvm.h index ef2a6a8328ea..469ca42c2a19 100644 --- a/drivers/kvm/kvm.h +++ b/drivers/kvm/kvm.h @@ -633,6 +633,9 @@ long kvm_arch_vm_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg); void kvm_arch_destroy_vm(struct kvm *kvm); +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu); +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu); + __init void kvm_arch_init(void); static inline void kvm_guest_enter(void) diff --git a/drivers/kvm/kvm_main.c b/drivers/kvm/kvm_main.c index 57573ebf02ba..7230f48ba08e 100644 --- a/drivers/kvm/kvm_main.c +++ b/drivers/kvm/kvm_main.c @@ -73,28 +73,6 @@ static inline int valid_vcpu(int n) return likely(n >= 0 && n < KVM_MAX_VCPUS); } -void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) - return; - - vcpu->guest_fpu_loaded = 1; - fx_save(&vcpu->host_fx_image); - fx_restore(&vcpu->guest_fx_image); -} -EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); - -void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) -{ - if (!vcpu->guest_fpu_loaded) - return; - - vcpu->guest_fpu_loaded = 0; - fx_save(&vcpu->guest_fx_image); - fx_restore(&vcpu->host_fx_image); -} -EXPORT_SYMBOL_GPL(kvm_put_guest_fpu); - /* * Switches to specified vcpu, until a matching vcpu_put() */ @@ -294,26 +272,6 @@ static int kvm_vm_release(struct inode *inode, struct file *filp) return 0; } -void fx_init(struct kvm_vcpu *vcpu) -{ - unsigned after_mxcsr_mask; - - /* Initialize guest FPU by resetting ours and saving into guest's */ - preempt_disable(); - fx_save(&vcpu->host_fx_image); - fpu_init(); - fx_save(&vcpu->guest_fx_image); - fx_restore(&vcpu->host_fx_image); - preempt_enable(); - - vcpu->cr0 |= X86_CR0_ET; - after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); - vcpu->guest_fx_image.mxcsr = 0x1f80; - memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask, - 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); -} -EXPORT_SYMBOL_GPL(fx_init); - /* * Allocate some memory and give it an address in the guest physical address * space. @@ -1422,67 +1380,6 @@ static int kvm_vcpu_ioctl_set_sigmask(struct kvm_vcpu *vcpu, sigset_t *sigset) return 0; } -/* - * fxsave fpu state. Taken from x86_64/processor.h. To be killed when - * we have asm/x86/processor.h - */ -struct fxsave { - u16 cwd; - u16 swd; - u16 twd; - u16 fop; - u64 rip; - u64 rdp; - u32 mxcsr; - u32 mxcsr_mask; - u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ -#ifdef CONFIG_X86_64 - u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ -#else - u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ -#endif -}; - -static int kvm_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; - - vcpu_load(vcpu); - - memcpy(fpu->fpr, fxsave->st_space, 128); - fpu->fcw = fxsave->cwd; - fpu->fsw = fxsave->swd; - fpu->ftwx = fxsave->twd; - fpu->last_opcode = fxsave->fop; - fpu->last_ip = fxsave->rip; - fpu->last_dp = fxsave->rdp; - memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); - - vcpu_put(vcpu); - - return 0; -} - -static int kvm_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) -{ - struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; - - vcpu_load(vcpu); - - memcpy(fxsave->st_space, fpu->fpr, 128); - fxsave->cwd = fpu->fcw; - fxsave->swd = fpu->fsw; - fxsave->twd = fpu->ftwx; - fxsave->fop = fpu->last_opcode; - fxsave->rip = fpu->last_ip; - fxsave->rdp = fpu->last_dp; - memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); - - vcpu_put(vcpu); - - return 0; -} - static long kvm_vcpu_ioctl(struct file *filp, unsigned int ioctl, unsigned long arg) { @@ -1613,7 +1510,7 @@ static long kvm_vcpu_ioctl(struct file *filp, struct kvm_fpu fpu; memset(&fpu, 0, sizeof fpu); - r = kvm_vcpu_ioctl_get_fpu(vcpu, &fpu); + r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, &fpu); if (r) goto out; r = -EFAULT; @@ -1628,7 +1525,7 @@ static long kvm_vcpu_ioctl(struct file *filp, r = -EFAULT; if (copy_from_user(&fpu, argp, sizeof fpu)) goto out; - r = kvm_vcpu_ioctl_set_fpu(vcpu, &fpu); + r = kvm_arch_vcpu_ioctl_set_fpu(vcpu, &fpu); if (r) goto out; r = 0; diff --git a/drivers/kvm/x86.c b/drivers/kvm/x86.c index 2cf7ebab50f4..ef1661f10b48 100644 --- a/drivers/kvm/x86.c +++ b/drivers/kvm/x86.c @@ -1785,3 +1785,106 @@ void kvm_emulate_cpuid(struct kvm_vcpu *vcpu) kvm_x86_ops->skip_emulated_instruction(vcpu); } EXPORT_SYMBOL_GPL(kvm_emulate_cpuid); + +/* + * fxsave fpu state. Taken from x86_64/processor.h. To be killed when + * we have asm/x86/processor.h + */ +struct fxsave { + u16 cwd; + u16 swd; + u16 twd; + u16 fop; + u64 rip; + u64 rdp; + u32 mxcsr; + u32 mxcsr_mask; + u32 st_space[32]; /* 8*16 bytes for each FP-reg = 128 bytes */ +#ifdef CONFIG_X86_64 + u32 xmm_space[64]; /* 16*16 bytes for each XMM-reg = 256 bytes */ +#else + u32 xmm_space[32]; /* 8*16 bytes for each XMM-reg = 128 bytes */ +#endif +}; + +int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; + + vcpu_load(vcpu); + + memcpy(fpu->fpr, fxsave->st_space, 128); + fpu->fcw = fxsave->cwd; + fpu->fsw = fxsave->swd; + fpu->ftwx = fxsave->twd; + fpu->last_opcode = fxsave->fop; + fpu->last_ip = fxsave->rip; + fpu->last_dp = fxsave->rdp; + memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space); + + vcpu_put(vcpu); + + return 0; +} + +int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu) +{ + struct fxsave *fxsave = (struct fxsave *)&vcpu->guest_fx_image; + + vcpu_load(vcpu); + + memcpy(fxsave->st_space, fpu->fpr, 128); + fxsave->cwd = fpu->fcw; + fxsave->swd = fpu->fsw; + fxsave->twd = fpu->ftwx; + fxsave->fop = fpu->last_opcode; + fxsave->rip = fpu->last_ip; + fxsave->rdp = fpu->last_dp; + memcpy(fxsave->xmm_space, fpu->xmm, sizeof fxsave->xmm_space); + + vcpu_put(vcpu); + + return 0; +} + +void fx_init(struct kvm_vcpu *vcpu) +{ + unsigned after_mxcsr_mask; + + /* Initialize guest FPU by resetting ours and saving into guest's */ + preempt_disable(); + fx_save(&vcpu->host_fx_image); + fpu_init(); + fx_save(&vcpu->guest_fx_image); + fx_restore(&vcpu->host_fx_image); + preempt_enable(); + + vcpu->cr0 |= X86_CR0_ET; + after_mxcsr_mask = offsetof(struct i387_fxsave_struct, st_space); + vcpu->guest_fx_image.mxcsr = 0x1f80; + memset((void *)&vcpu->guest_fx_image + after_mxcsr_mask, + 0, sizeof(struct i387_fxsave_struct) - after_mxcsr_mask); +} +EXPORT_SYMBOL_GPL(fx_init); + +void kvm_load_guest_fpu(struct kvm_vcpu *vcpu) +{ + if (!vcpu->fpu_active || vcpu->guest_fpu_loaded) + return; + + vcpu->guest_fpu_loaded = 1; + fx_save(&vcpu->host_fx_image); + fx_restore(&vcpu->guest_fx_image); +} +EXPORT_SYMBOL_GPL(kvm_load_guest_fpu); + +void kvm_put_guest_fpu(struct kvm_vcpu *vcpu) +{ + if (!vcpu->guest_fpu_loaded) + return; + + vcpu->guest_fpu_loaded = 0; + fx_save(&vcpu->guest_fx_image); + fx_restore(&vcpu->host_fx_image); +} +EXPORT_SYMBOL_GPL(kvm_put_guest_fpu);