Commit 1ed576a2 authored by Janosch Frank's avatar Janosch Frank Committed by Christian Borntraeger
Browse files

KVM: s390: pv: Mark mm as protected after the set secure parameters and improve cleanup 



We can only have protected guest pages after a successful set secure
parameters call as only then the UV allows imports and unpacks.

By moving the test we can now also check for it in s390_reset_acc()
and do an early return if it is 0.

Signed-off-by: default avatarJanosch Frank <frankja@linux.ibm.com>
Fixes: 29b40f10 ("KVM: s390: protvirt: Add initial vm and cpu lifecycle handling")
Reviewed-by: default avatarCornelia Huck <cohuck@redhat.com>
Signed-off-by: default avatarChristian Borntraeger <borntraeger@de.ibm.com>
parent 6d6a18fd

arch/s390/kvm/kvm-s390.c

+1 −1
Original line number Diff line number Diff line
@@ -2312,7 +2312,7 @@ static int kvm_s390_handle_pv(struct kvm *kvm, struct kvm_pv_cmd *cmd) 
		struct kvm_s390_pv_unp unp = {};



		r = -EINVAL;

		if (!kvm_s390_pv_is_protected(kvm))

		if (!kvm_s390_pv_is_protected(kvm) || !mm_is_protected(kvm->mm))

			break;



		r = -EFAULT;

arch/s390/kvm/pv.c

+2 −1
Original line number Diff line number Diff line
@@ -208,7 +208,6 @@ int kvm_s390_pv_init_vm(struct kvm *kvm, u16 *rc, u16 *rrc) 
		return -EIO;

	}

	kvm->arch.gmap->guest_handle = uvcb.guest_handle;

	atomic_set(&kvm->mm->context.is_protected, 1);

	return 0;

}
@@ -228,6 +227,8 @@ int kvm_s390_pv_set_sec_parms(struct kvm *kvm, void *hdr, u64 length, u16 *rc, 
	*rrc = uvcb.header.rrc;

	KVM_UV_EVENT(kvm, 3, "PROTVIRT VM SET PARMS: rc %x rrc %x",

		     *rc, *rrc);

	if (!cc)

		atomic_set(&kvm->mm->context.is_protected, 1);

	return cc ? -EINVAL : 0;

}

arch/s390/mm/gmap.c

+2 −0
Original line number Diff line number Diff line
@@ -2690,6 +2690,8 @@ static const struct mm_walk_ops reset_acc_walk_ops = { 
#include <linux/sched/mm.h>

void s390_reset_acc(struct mm_struct *mm)

{

	if (!mm_is_protected(mm))

		return;

	/*

	 * we might be called during

	 * reset:                             we walk the pages and clear

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