diff mbox

[v2,12/16] KVM: Move vcpu_load to arch-specific kvm_arch_vcpu_ioctl_get_fpu

Message ID 20171129164116.16167-13-christoffer.dall@linaro.org (mailing list archive)
State New, archived
Headers show

Commit Message

Christoffer Dall Nov. 29, 2017, 4:41 p.m. UTC
Move vcpu_load() and vcpu_put() into the architecture specific
implementations of kvm_arch_vcpu_ioctl_get_fpu().

Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
---
 arch/s390/kvm/kvm-s390.c | 4 ++++
 arch/x86/kvm/x86.c       | 7 +++++--
 virt/kvm/kvm_main.c      | 2 --
 3 files changed, 9 insertions(+), 4 deletions(-)

Comments

David Hildenbrand Nov. 29, 2017, 5:40 p.m. UTC | #1
On 29.11.2017 17:41, Christoffer Dall wrote:
> Move vcpu_load() and vcpu_put() into the architecture specific
> implementations of kvm_arch_vcpu_ioctl_get_fpu().
> 
> Signed-off-by: Christoffer Dall <christoffer.dall@linaro.org>
> ---
>  arch/s390/kvm/kvm-s390.c | 4 ++++
>  arch/x86/kvm/x86.c       | 7 +++++--
>  virt/kvm/kvm_main.c      | 2 --
>  3 files changed, 9 insertions(+), 4 deletions(-)
> 
> diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
> index 4bf80b5..88dcb89 100644
> --- a/arch/s390/kvm/kvm-s390.c
> +++ b/arch/s390/kvm/kvm-s390.c
> @@ -2765,6 +2765,8 @@ int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
>  
>  int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
>  {
> +	vcpu_load(vcpu);
> +
>  	/* make sure we have the latest values */
>  	save_fpu_regs();
>  	if (MACHINE_HAS_VX)
> @@ -2773,6 +2775,8 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
>  	else
>  		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
>  	fpu->fpc = vcpu->run->s.regs.fpc;
> +
> +	vcpu_put(vcpu);

This is one example where we need the vcpu_put/load.

>  	return 0;
>  }
>  
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index a074b0bd..8b54567 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -7679,9 +7679,11 @@ int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
>  
>  int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
>  {
> -	struct fxregs_state *fxsave =
> -			&vcpu->arch.guest_fpu.state.fxsave;
> +	struct fxregs_state *fxsave;
>  
> +	vcpu_load(vcpu);
> +
> +	fxsave = &vcpu->arch.guest_fpu.state.fxsave;
>  	memcpy(fpu->fpr, fxsave->st_space, 128);
>  	fpu->fcw = fxsave->cwd;
>  	fpu->fsw = fxsave->swd;
> @@ -7691,6 +7693,7 @@ int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
>  	fpu->last_dp = fxsave->rdp;
>  	memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
>  
> +	vcpu_put(vcpu);
>  	return 0;
>  }
>  
> diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
> index c688eb7..73ad70a 100644
> --- a/virt/kvm/kvm_main.c
> +++ b/virt/kvm/kvm_main.c
> @@ -2673,9 +2673,7 @@ static long kvm_vcpu_ioctl(struct file *filp,
>  		r = -ENOMEM;
>  		if (!fpu)
>  			goto out;
> -		vcpu_load(vcpu);
>  		r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
> -		vcpu_put(vcpu);
>  		if (r)
>  			goto out;
>  		r = -EFAULT;
> 

Reviewed-by: David Hildenbrand <david@redhat.com>
diff mbox

Patch

diff --git a/arch/s390/kvm/kvm-s390.c b/arch/s390/kvm/kvm-s390.c
index 4bf80b5..88dcb89 100644
--- a/arch/s390/kvm/kvm-s390.c
+++ b/arch/s390/kvm/kvm-s390.c
@@ -2765,6 +2765,8 @@  int kvm_arch_vcpu_ioctl_set_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
+	vcpu_load(vcpu);
+
 	/* make sure we have the latest values */
 	save_fpu_regs();
 	if (MACHINE_HAS_VX)
@@ -2773,6 +2775,8 @@  int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 	else
 		memcpy(fpu->fprs, vcpu->run->s.regs.fprs, sizeof(fpu->fprs));
 	fpu->fpc = vcpu->run->s.regs.fpc;
+
+	vcpu_put(vcpu);
 	return 0;
 }
 
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index a074b0bd..8b54567 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7679,9 +7679,11 @@  int kvm_arch_vcpu_ioctl_translate(struct kvm_vcpu *vcpu,
 
 int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 {
-	struct fxregs_state *fxsave =
-			&vcpu->arch.guest_fpu.state.fxsave;
+	struct fxregs_state *fxsave;
 
+	vcpu_load(vcpu);
+
+	fxsave = &vcpu->arch.guest_fpu.state.fxsave;
 	memcpy(fpu->fpr, fxsave->st_space, 128);
 	fpu->fcw = fxsave->cwd;
 	fpu->fsw = fxsave->swd;
@@ -7691,6 +7693,7 @@  int kvm_arch_vcpu_ioctl_get_fpu(struct kvm_vcpu *vcpu, struct kvm_fpu *fpu)
 	fpu->last_dp = fxsave->rdp;
 	memcpy(fpu->xmm, fxsave->xmm_space, sizeof fxsave->xmm_space);
 
+	vcpu_put(vcpu);
 	return 0;
 }
 
diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
index c688eb7..73ad70a 100644
--- a/virt/kvm/kvm_main.c
+++ b/virt/kvm/kvm_main.c
@@ -2673,9 +2673,7 @@  static long kvm_vcpu_ioctl(struct file *filp,
 		r = -ENOMEM;
 		if (!fpu)
 			goto out;
-		vcpu_load(vcpu);
 		r = kvm_arch_vcpu_ioctl_get_fpu(vcpu, fpu);
-		vcpu_put(vcpu);
 		if (r)
 			goto out;
 		r = -EFAULT;