[PATCH] Revert "kvm: x86: Use task structs fpu field for user"

This reverts commit 240c35a3783ab9b3a0afaba0dde7291295680a6b
("kvm: x86: Use task structs fpu field for user", 2018-11-06).
The commit is broken and causes QEMU's FPU state to be destroyed
when KVM_RUN is preempted.

Fixes: 240c35a3783a ("kvm: x86: Use task structs fpu field for user")
Cc: stable@vger.kernel.org
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
 arch/x86/include/asm/kvm_host.h | 7 ++++---
 arch/x86/kvm/x86.c              | 4 ++--
 2 files changed, 6 insertions(+), 5 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 0cc5b611a113..b2f1ffb937af 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h

@@ -607,15 +607,16 @@ struct kvm_vcpu_arch {

        /*
         * QEMU userspace and the guest each have their own FPU state.
-        * In vcpu_run, we switch between the user, maintained in the
-        * task_struct struct, and guest FPU contexts. While running a VCPU,
-        * the VCPU thread will have the guest FPU context.
+        * In vcpu_run, we switch between the user and guest FPU contexts.
+        * While running a VCPU, the VCPU thread will have the guest FPU
+        * context.
         *
         * Note that while the PKRU state lives inside the fpu registers,
         * it is switched out separately at VMENTER and VMEXIT time. The
         * "guest_fpu" state here contains the guest FPU context, with the
         * host PRKU bits.
         */
+       struct fpu user_fpu;
        struct fpu *guest_fpu;

        u64 xcr0;

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 58305cf81182..cf2afdf8facf 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c

@@ -8270,7 +8270,7 @@ static void kvm_load_guest_fpu(struct kvm_vcpu *vcpu)
 {
        fpregs_lock();

-       copy_fpregs_to_fpstate(&current->thread.fpu);
+       copy_fpregs_to_fpstate(&vcpu->arch.user_fpu);
        /* PKRU is separately restored in kvm_x86_ops->run.  */
        __copy_kernel_to_fpregs(&vcpu->arch.guest_fpu->state,
                                ~XFEATURE_MASK_PKRU);

@@ -8287,7 +8287,7 @@ static void kvm_put_guest_fpu(struct kvm_vcpu *vcpu)
        fpregs_lock();

        copy_fpregs_to_fpstate(vcpu->arch.guest_fpu);
-       copy_kernel_to_fpregs(&current->thread.fpu.state);
+       copy_kernel_to_fpregs(&vcpu->arch.user_fpu.state);

        fpregs_mark_activate();
        fpregs_unlock();