MIPS: KVM: Fix preemptable kvm_mips_get_*_asid() calls
There are a couple of places in KVM fault handling code which implicitly use smp_processor_id() via kvm_mips_get_kernel_asid() and kvm_mips_get_user_asid() from preemptable context. This is unsafe as a preemption could cause the guest kernel ASID to be changed, resulting in a host TLB entry being written with the wrong ASID. Fix by disabling preemption around the kvm_mips_get_*_asid() call and the corresponding kvm_mips_host_tlb_write(). Signed-off-by:James Hogan <james.hogan@imgtec.com> Cc: Paolo Bonzini <pbonzini@redhat.com> Cc: "Radim KrÄmář" <rkrcmar@redhat.com> Cc: Ralf Baechle <ralf@linux-mips.org> Cc: linux-mips@linux-mips.org Cc: kvm@vger.kernel.org Signed-off-by:
Paolo Bonzini <pbonzini@redhat.com>
parent
b45bacd2
Please register or sign in to comment