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

Needed for emulating fpu instructions.

Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Avi Kivity 2011-03-28 16:53:59 +02:00
parent 1d6b114f20
commit 5037f6f324
2 changed files with 20 additions and 0 deletions
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2
arch/x86/include/asm/kvm_emulate.h
View File

@ -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. */

18
arch/x86/kvm/x86.c
View File

@ -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)