diff options
| author | Paul Mackerras <paulus@samba.org> | 2014-07-19 07:59:35 (GMT) |
|---|---|---|
| committer | Alexander Graf <agraf@suse.de> | 2014-07-28 13:23:16 (GMT) |
| commit | ef1af2e29622ff3403926ae801a2b10da075a2de (patch) | |
| tree | eace6cec47bc537474d93986f5f33d136aeb29c9 /arch/powerpc | |
| parent | a0840240c0c6bcbac8f0f5db11f95c19aaf9b52f (diff) | |
| download | linux-ef1af2e29622ff3403926ae801a2b10da075a2de.tar.xz | |
KVM: PPC: Book3S PR: Take SRCU read lock around RTAS kvm_read_guest() call
This does for PR KVM what c9438092cae4 ("KVM: PPC: Book3S HV: Take SRCU
read lock around kvm_read_guest() call") did for HV KVM, that is,
eliminate a "suspicious rcu_dereference_check() usage!" warning by
taking the SRCU lock around the call to kvmppc_rtas_hcall().
It also fixes a return of RESUME_HOST to return EMULATE_FAIL instead,
since kvmppc_h_pr() is supposed to return EMULATE_* values.
Signed-off-by: Paul Mackerras <paulus@samba.org>
Cc: stable@vger.kernel.org
Signed-off-by: Alexander Graf <agraf@suse.de>
Diffstat (limited to 'arch/powerpc')
| -rw-r--r-- | arch/powerpc/kvm/book3s_pr_papr.c | 9 |
1 files changed, 7 insertions, 2 deletions
diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c index 6d0143f..ce3c893 100644 --- a/arch/powerpc/kvm/book3s_pr_papr.c +++ b/arch/powerpc/kvm/book3s_pr_papr.c @@ -267,6 +267,8 @@ static int kvmppc_h_pr_xics_hcall(struct kvm_vcpu *vcpu, u32 cmd) int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd) { + int rc, idx; + if (cmd <= MAX_HCALL_OPCODE && !test_bit(cmd/4, vcpu->kvm->arch.enabled_hcalls)) return EMULATE_FAIL; @@ -299,8 +301,11 @@ int kvmppc_h_pr(struct kvm_vcpu *vcpu, unsigned long cmd) break; case H_RTAS: if (list_empty(&vcpu->kvm->arch.rtas_tokens)) - return RESUME_HOST; - if (kvmppc_rtas_hcall(vcpu)) + break; + idx = srcu_read_lock(&vcpu->kvm->srcu); + rc = kvmppc_rtas_hcall(vcpu); + srcu_read_unlock(&vcpu->kvm->srcu, idx); + if (rc) break; kvmppc_set_gpr(vcpu, 3, 0); return EMULATE_DONE; |