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Commit f315104a authored by Christian Borntraeger's avatar Christian Borntraeger
Browse files

KVM: s390: force bp isolation for VSIE 



If the guest runs with bp isolation when doing a SIE instruction,
we must also run the nested guest with bp isolation when emulating
that SIE instruction.
This is done by activating BPBC in the lpar, which acts as an override
for lower level guests.

Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
Reviewed-by: default avatarJanosch Frank <frankja@linux.vnet.ibm.com>
Reviewed-by: default avatarDavid Hildenbrand <david@redhat.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 8846f317

arch/s390/kvm/vsie.c

+20 −0
Original line number Diff line number Diff line
@@ -821,6 +821,7 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
{

	struct kvm_s390_sie_block *scb_s = &vsie_page->scb_s;

	struct kvm_s390_sie_block *scb_o = vsie_page->scb_o;

	int guest_bp_isolation;

	int rc;



	handle_last_fault(vcpu, vsie_page);
@@ -831,6 +832,20 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
		s390_handle_mcck();



	srcu_read_unlock(&vcpu->kvm->srcu, vcpu->srcu_idx);



	/* save current guest state of bp isolation override */

	guest_bp_isolation = test_thread_flag(TIF_ISOLATE_BP_GUEST);



	/*

	 * The guest is running with BPBC, so we have to force it on for our

	 * nested guest. This is done by enabling BPBC globally, so the BPBC

	 * control in the SCB (which the nested guest can modify) is simply

	 * ignored.

	 */

	if (test_kvm_facility(vcpu->kvm, 82) &&

	    vcpu->arch.sie_block->fpf & FPF_BPBC)

		set_thread_flag(TIF_ISOLATE_BP_GUEST);



	local_irq_disable();

	guest_enter_irqoff();

	local_irq_enable();
@@ -840,6 +855,11 @@ static int do_vsie_run(struct kvm_vcpu *vcpu, struct vsie_page *vsie_page) 
	local_irq_disable();

	guest_exit_irqoff();

	local_irq_enable();



	/* restore guest state for bp isolation override */

	if (!guest_bp_isolation)

		clear_thread_flag(TIF_ISOLATE_BP_GUEST);



	vcpu->srcu_idx = srcu_read_lock(&vcpu->kvm->srcu);



	if (rc == -EINTR) {