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Date: Mon, 15 Sep 2014 15:08:33 -0700 From: Kamal Mostafa <kamal@...onical.com> To: linux-kernel@...r.kernel.org, stable@...r.kernel.org, kernel-team@...ts.ubuntu.com Cc: Paul Mackerras <paulus@...ba.org>, Alexander Graf <agraf@...e.de>, Kamal Mostafa <kamal@...onical.com> Subject: [PATCH 3.13 103/187] KVM: PPC: Book3S PR: Take SRCU read lock around RTAS kvm_read_guest() call 3.13.11.7 -stable review patch. If anyone has any objections, please let me know. ------------------ From: Paul Mackerras <paulus@...ba.org> commit ef1af2e29622ff3403926ae801a2b10da075a2de upstream. 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@...ba.org> Signed-off-by: Alexander Graf <agraf@...e.de> Signed-off-by: Kamal Mostafa <kamal@...onical.com> --- arch/powerpc/kvm/book3s_pr_papr.c | 9 +++++++-- 1 file changed, 7 insertions(+), 2 deletions(-) diff --git a/arch/powerpc/kvm/book3s_pr_papr.c b/arch/powerpc/kvm/book3s_pr_papr.c index 5efa97b..7a801b5 100644 --- a/arch/powerpc/kvm/book3s_pr_papr.c +++ b/arch/powerpc/kvm/book3s_pr_papr.c @@ -258,6 +258,8 @@ 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; + switch (cmd) { case H_ENTER: return kvmppc_h_pr_enter(vcpu); @@ -286,8 +288,11 @@ 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; -- 1.9.1 -- To unsubscribe from this list: send the line "unsubscribe linux-kernel" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html Please read the FAQ at http://www.tux.org/lkml/
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