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@xxxxxxxxxx>
> ---
> 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@xxxxxxxxxx>
--
Thanks,
David / dhildenb
