From 5037f6f324cdcc6c9071dc774aba992f96c7e5ff Mon Sep 17 00:00:00 2001 From: Avi Kivity Date: Mon, 28 Mar 2011 16:53:59 +0200 Subject: [PATCH] KVM: x86 emulator: define callbacks for using the guest fpu within the emulator Needed for emulating fpu instructions. Signed-off-by: Avi Kivity --- arch/x86/include/asm/kvm_emulate.h | 2 ++ arch/x86/kvm/x86.c | 18 ++++++++++++++++++ 2 files changed, 20 insertions(+) diff --git a/arch/x86/include/asm/kvm_emulate.h b/arch/x86/include/asm/kvm_emulate.h index c00aed1..4c0e682 100644 --- a/arch/x86/include/asm/kvm_emulate.h +++ b/arch/x86/include/asm/kvm_emulate.h @@ -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. */ diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c index 11d692c..5af6651 100644 --- a/arch/x86/kvm/x86.c +++ b/arch/x86/kvm/x86.c @@ -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) -- 2.7.4