Commit 0e928b12 authored by James Hogan's avatar James Hogan Committed by Paolo Bonzini
Browse files

mips/kvm: Disable FPU on reset with KVM 



KVM doesn't yet support the MIPS FPU, or writing to the guest's Config1
register which contains the FPU implemented bit. Clear QEMU's version of
that bit on reset and display a warning that the FPU has been disabled.

The previous incorrect Config1 CP0 register value wasn't being passed to
KVM yet, however we should ensure it is set correctly now to reduce the
risk of breaking migration/loadvm to a future version of QEMU/Linux that
does support it.

Signed-off-by: default avatarJames Hogan <james.hogan@imgtec.com>
Cc: Aurelien Jarno <aurelien@aurel32.net>
Cc: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent 0a2672b7

target-mips/kvm.c

+7 −0
Original line number Diff line number Diff line
@@ -61,6 +61,13 @@ int kvm_arch_init_vcpu(CPUState *cs) 


void kvm_mips_reset_vcpu(MIPSCPU *cpu)

{

    CPUMIPSState *env = &cpu->env;



    if (env->CP0_Config1 & (1 << CP0C1_FP)) {

        fprintf(stderr, "Warning: FPU not supported with KVM, disabling\n");

        env->CP0_Config1 &= ~(1 << CP0C1_FP);

    }



    DPRINTF("%s\n", __func__);

}