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KVM: s390: Fix tprot locking

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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 <borntraeger@de.ibm.com>
Signed-off-by: Carsten Otte <cotte@de.ibm.com>
Signed-off-by: Avi Kivity <avi@redhat.com>
This commit is contained in:
Christian Borntraeger 2011-11-17 11:00:43 +01:00 committed by Avi Kivity
parent bd59d3a444
commit 1eddb85f88
1 changed files with 8 additions and 2 deletions
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10
arch/s390/kvm/priv.c
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@ -336,6 +336,7 @@ static int handle_tprot(struct kvm_vcpu *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 *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(&current->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(&current->mm->mmap_sem);
return kvm_s390_inject_program_int(vcpu, PGM_ADDRESSING);