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KVM: PPC: Book3S HV: Allow DTL to be set to address 0, length 0 

Commit 55b665b026 ("KVM: PPC: Book3S HV: Provide a way for userspace
to get/set per-vCPU areas") includes a check on the length of the
dispatch trace log (DTL) to make sure the buffer is at least one entry
long.  This is appropriate when registering a buffer, but the
interface also allows for any existing buffer to be unregistered by
specifying a zero address.  In this case the length check is not
appropriate.  This makes the check conditional on the address being
non-zero.

Signed-off-by: Paul Mackerras <paulus@samba.org>
Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Paul Mackerras 2012-10-15 01:18:37 +00:00 committed by Alexander Graf
parent c7b676709c
commit 9f8c8c7812
1 changed files with 2 additions and 3 deletions
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5
arch/powerpc/kvm/book3s_hv.c
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@ -811,9 +811,8 @@ int kvmppc_set_one_reg(struct kvm_vcpu *vcpu, u64 id, union kvmppc_one_reg *val)
addr = val->vpaval.addr;
len = val->vpaval.length;
r = -EINVAL;
if (len < sizeof(struct dtl_entry))
break;
if (addr && !vcpu->arch.vpa.next_gpa)
if (addr && (len < sizeof(struct dtl_entry) ||
!vcpu->arch.vpa.next_gpa))
break;
len -= len % sizeof(struct dtl_entry);
r = set_vpa(vcpu, &vcpu->arch.dtl, addr, len);