linux-kernel - [PATCH v2 0/2] x86,kvm: move qemu/guest FPU switching out to kvm_arch_vcpu_ioctl

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Date:   Tue, 14 Nov 2017 16:54:22 -0500
From:   riel@...hat.com
To:     pbonzini@...hat.com
Cc:     kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
        david@...hat.com, borntraeger@...ibm.com, tglx@...utronix.de,
        rkrcmar@...hat.com
Subject: [PATCH v2 0/2] x86,kvm: move qemu/guest FPU switching out to kvm_arch_vcpu_ioctl_run

This code moves FPU handling from the non-preemptible part of running
a VCPU, way further out into the KVM_RUN ioctl handling. That way there
is no need to continuously save and load the qemu FPU user context
every time a VCPU context switches, or goes to sleep in the host kernel.

v2:
- move FPU switching out to kvm_arch_vcpu_ioctl_run (David Hildenbrand)
- remove fpu handling from arch/x86/kvm/emulator.c (no longer needed)