linux-kernel - [PATCH 4.4 31/48] KVM: x86: remove eager_fpu field of struct kvm_vcpu

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Date:   Thu, 18 Oct 2018 19:55:06 +0200
From:   Greg Kroah-Hartman <gregkh@...uxfoundation.org>
To:     linux-kernel@...r.kernel.org
Cc:     Greg Kroah-Hartman <gregkh@...uxfoundation.org>,
        stable@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Daniel Sangorrin <daniel.sangorrin@...hiba.co.jp>
Subject: [PATCH 4.4 31/48] KVM: x86: remove eager_fpu field of struct kvm_vcpu_arch

4.4-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Paolo Bonzini <pbonzini@...hat.com>

commit 5a5fbdc0e3f1159a734f1890da60fce70e98271d upstream.

It is now equal to use_eager_fpu(), which simply tests a cpufeature bit.

Signed-off-by: Paolo Bonzini <pbonzini@...hat.com>
Signed-off-by: Daniel Sangorrin <daniel.sangorrin@...hiba.co.jp>
Signed-off-by: Greg Kroah-Hartman <gregkh@...uxfoundation.org>
---
 arch/x86/include/asm/kvm_host.h |    1 -
 arch/x86/kvm/cpuid.c            |    3 +--
 arch/x86/kvm/x86.c              |    2 +-
 3 files changed, 2 insertions(+), 4 deletions(-)

--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -439,7 +439,6 @@ struct kvm_vcpu_arch {
 	struct kvm_mmu_memory_cache mmu_page_header_cache;
 
 	struct fpu guest_fpu;
-	bool eager_fpu;
 	u64 xcr0;
 	u64 guest_supported_xcr0;
 	u32 guest_xstate_size;
--- a/arch/x86/kvm/cpuid.c
+++ b/arch/x86/kvm/cpuid.c
@@ -104,8 +104,7 @@ int kvm_update_cpuid(struct kvm_vcpu *vc
 	if (best && (best->eax & (F(XSAVES) | F(XSAVEC))))
 		best->ebx = xstate_required_size(vcpu->arch.xcr0, true);
 
-	vcpu->arch.eager_fpu = use_eager_fpu();
-	if (vcpu->arch.eager_fpu)
+	if (use_eager_fpu())
 		kvm_x86_ops->fpu_activate(vcpu);
 
 	/*
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -7325,7 +7325,7 @@ void kvm_put_guest_fpu(struct kvm_vcpu *
 	 * Every 255 times fpu_counter rolls over to 0; a guest that uses
 	 * the FPU in bursts will revert to loading it on demand.
 	 */
-	if (!vcpu->arch.eager_fpu) {
+	if (!use_eager_fpu()) {
 		if (++vcpu->fpu_counter < 5)
 			kvm_make_request(KVM_REQ_DEACTIVATE_FPU, vcpu);
 	}