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Commit 5037f6f3 authored by Avi Kivity's avatar Avi Kivity
Browse files

KVM: x86 emulator: define callbacks for using the guest fpu within the emulator 



Needed for emulating fpu instructions.

Signed-off-by: default avatarAvi Kivity <avi@redhat.com>
parent 1d6b114f

arch/x86/include/asm/kvm_emulate.h

+2 −0
Original line number Diff line number Diff line
@@ -158,6 +158,8 @@ struct x86_emulate_ops { 
	int (*set_dr)(int dr, unsigned long value, struct kvm_vcpu *vcpu);

	int (*set_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 data);

	int (*get_msr)(struct kvm_vcpu *vcpu, u32 msr_index, u64 *pdata);

	void (*get_fpu)(struct x86_emulate_ctxt *ctxt); /* disables preempt */

	void (*put_fpu)(struct x86_emulate_ctxt *ctxt); /* reenables preempt */

};



/* Type, address-of, and value of an instruction's operand. */

arch/x86/kvm/x86.c

+18 −0
Original line number Diff line number Diff line
@@ -4281,6 +4281,22 @@ static void emulator_set_segment_selector(u16 sel, int seg, 
	kvm_set_segment(vcpu, &kvm_seg, seg);

}



static void emulator_get_fpu(struct x86_emulate_ctxt *ctxt)

{

	preempt_disable();

	kvm_load_guest_fpu(ctxt->vcpu);

	/*

	 * CR0.TS may reference the host fpu state, not the guest fpu state,

	 * so it may be clear at this point.

	 */

	clts();

}



static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)

{

	preempt_enable();

}



static struct x86_emulate_ops emulate_ops = {

	.read_std            = kvm_read_guest_virt_system,

	.write_std           = kvm_write_guest_virt_system,
@@ -4304,6 +4320,8 @@ static struct x86_emulate_ops emulate_ops = { 
	.set_dr              = emulator_set_dr,

	.set_msr             = kvm_set_msr,

	.get_msr             = kvm_get_msr,

	.get_fpu             = emulator_get_fpu,

	.put_fpu             = emulator_put_fpu,

};



static void cache_all_regs(struct kvm_vcpu *vcpu)