Now that x86 always uses eager FPU switching on the host, there's no
need for KVM to manipulate the host's CR0.TS.
This should be both simpler and faster.
Signed-off-by: Andy Lutomirski <luto@kernel.org>
Cc: Borislav Petkov <bp@alien8.de>
Cc: Brian Gerst <brgerst@gmail.com>
Cc: Dave Hansen <dave.hansen@linux.intel.com>
Cc: Denys Vlasenko <dvlasenk@redhat.com>
Cc: Fenghua Yu <fenghua.yu@intel.com>
Cc: H. Peter Anvin <hpa@zytor.com>
Cc: Josh Poimboeuf <jpoimboe@redhat.com>
Cc: Linus Torvalds <torvalds@linux-foundation.org>
Cc: Oleg Nesterov <oleg@redhat.com>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Cc: Peter Zijlstra <peterz@infradead.org>
Cc: Quentin Casasnovas <quentin.casasnovas@oracle.com>
Cc: Rik van Riel <riel@redhat.com>
Cc: Rusty Russell <rusty@rustcorp.com.au>
Cc: Thomas Gleixner <tglx@linutronix.de>
Cc: kvm list <kvm@vger.kernel.org>
Link: http://lkml.kernel.org/r/b212064922537c05d0c81d931fc4dbe769127ce7.1477951965.git.luto@kernel.org
Signed-off-by: Ingo Molnar <mingo@kernel.org>
#endif
if (vmx->host_state.msr_host_bndcfgs)
wrmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
#endif
if (vmx->host_state.msr_host_bndcfgs)
wrmsrl(MSR_IA32_BNDCFGS, vmx->host_state.msr_host_bndcfgs);
- /*
- * If the FPU is not active (through the host task or
- * the guest vcpu), then restore the cr0.TS bit.
- */
- if (!fpregs_active() && !vmx->vcpu.guest_fpu_loaded)
- stts();
load_gdt(this_cpu_ptr(&host_gdt));
}
load_gdt(this_cpu_ptr(&host_gdt));
}
u32 low32, high32;
unsigned long tmpl;
struct desc_ptr dt;
u32 low32, high32;
unsigned long tmpl;
struct desc_ptr dt;
+ unsigned long cr0, cr4;
- vmcs_writel(HOST_CR0, read_cr0() & ~X86_CR0_TS); /* 22.2.3 */
+ cr0 = read_cr0();
+ WARN_ON(cr0 & X86_CR0_TS);
+ vmcs_writel(HOST_CR0, cr0); /* 22.2.3 */
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
/* Save the most likely value for this task's CR4 in the VMCS. */
vmcs_writel(HOST_CR3, read_cr3()); /* 22.2.3 FIXME: shadow tables */
/* Save the most likely value for this task's CR4 in the VMCS. */
{
preempt_disable();
kvm_load_guest_fpu(emul_to_vcpu(ctxt));
{
preempt_disable();
kvm_load_guest_fpu(emul_to_vcpu(ctxt));
- /*
- * 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)
}
static void emulator_put_fpu(struct x86_emulate_ctxt *ctxt)