From: Christian Borntraeger <[email protected]> There is a potential host deadlock in the tprot intercept handling. We must not hold the mmap semaphore while resolving the guest address. If userspace is remapping, then the memory detection in the guest is broken anyway so we can safely separate the address translation from walking the vmas.
Signed-off-by: Christian Borntraeger <[email protected]> Signed-off-by: Carsten Otte <[email protected]> --- arch/s390/kvm/priv.c | 10 ++++++++-- 1 file changed, 8 insertions(+), 2 deletions(-) diff -urpN linux-2.6/arch/s390/kvm/priv.c linux-2.6-patched/arch/s390/kvm/priv.c --- linux-2.6/arch/s390/kvm/priv.c 2011-10-24 09:10:05.000000000 +0200 +++ linux-2.6-patched/arch/s390/kvm/priv.c 2011-11-17 10:03:53.000000000 +0100 @@ -336,6 +336,7 @@ static int handle_tprot(struct kvm_vcpu u64 address1 = disp1 + base1 ? vcpu->arch.guest_gprs[base1] : 0; u64 address2 = disp2 + base2 ? vcpu->arch.guest_gprs[base2] : 0; struct vm_area_struct *vma; + unsigned long user_address; vcpu->stat.instruction_tprot++; @@ -349,9 +350,14 @@ static int handle_tprot(struct kvm_vcpu return -EOPNOTSUPP; + /* we must resolve the address without holding the mmap semaphore. + * This is ok since the userspace hypervisor is not supposed to change + * the mapping while the guest queries the memory. Otherwise the guest + * might crash or get wrong info anyway. */ + user_address = (unsigned long) __guestaddr_to_user(vcpu, address1); + down_read(¤t->mm->mmap_sem); - vma = find_vma(current->mm, - (unsigned long) __guestaddr_to_user(vcpu, address1)); + vma = find_vma(current->mm, user_address); if (!vma) { up_read(¤t->mm->mmap_sem); return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING); -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
