diff options
| author | Paul Mackerras <paulus@samba.org> | 2012-10-15 01:18:37 +0000 |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2012-10-30 10:54:58 +0100 |
| commit | 9f8c8c7812976fbfaf4bb30aaf8f6b001864f20a (patch) | |
| tree | d2b200398f27d85c4b4b9e2fff24a20f8d5334a9 /arch/powerpc/kvm | |
| parent | c7b676709c163e12ec161c0593c2c76809c25ff4 (diff) | |
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>
Diffstat (limited to 'arch/powerpc/kvm')
| -rw-r--r-- | arch/powerpc/kvm/book3s_hv.c | 5 |
1 files changed, 2 insertions, 3 deletions
diff --git a/arch/powerpc/kvm/book3s_hv.c b/arch/powerpc/kvm/book3s_hv.c index 8b3c470e6cb9..812764c96229 100644 --- a/arch/powerpc/kvm/book3s_hv.c +++ b/arch/powerpc/kvm/book3s_hv.c @@ -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); |