From: Marc Zyngier maz@kernel.org
commit 85d703746154cdc6794b6654b587b0b0354c97e9 upstream.
On vcpu reset, we expect all the registers to be brought back to their initial state, which happens to be a bunch of zeroes.
However, some recent commit broke this, and is now leaving a bunch of registers (such as the FP state) with whatever was left by the guest. My bad.
Zero the reset of the state (32bit SPSRs and FPSIMD state).
Cc: stable@vger.kernel.org Fixes: e47c2055c68e ("KVM: arm64: Make struct kvm_regs userspace-only") Signed-off-by: Marc Zyngier maz@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- arch/arm64/kvm/reset.c | 5 +++++ 1 file changed, 5 insertions(+)
--- a/arch/arm64/kvm/reset.c +++ b/arch/arm64/kvm/reset.c @@ -242,6 +242,11 @@ int kvm_reset_vcpu(struct kvm_vcpu *vcpu
/* Reset core registers */ memset(vcpu_gp_regs(vcpu), 0, sizeof(*vcpu_gp_regs(vcpu))); + memset(&vcpu->arch.ctxt.fp_regs, 0, sizeof(vcpu->arch.ctxt.fp_regs)); + vcpu->arch.ctxt.spsr_abt = 0; + vcpu->arch.ctxt.spsr_und = 0; + vcpu->arch.ctxt.spsr_irq = 0; + vcpu->arch.ctxt.spsr_fiq = 0; vcpu_gp_regs(vcpu)->pstate = pstate;
/* Reset system registers */