From: Alexander Graf <agraf@suse.de>
Date: Thu, 10 Jul 2014 17:19:35 +0000 (+0200)
Subject: KVM: PPC: Deflect page write faults properly in kvmppc_st
X-Git-Url: https://git.stricted.de/?a=commitdiff_plain;h=17824b5afcf273f6fc3e04df2d2a9d90d5c864fd;p=GitHub%2Fmoto-9609%2Fandroid_kernel_motorola_exynos9610.git

KVM: PPC: Deflect page write faults properly in kvmppc_st

When we have a page that we're not allowed to write to, xlate() will already
tell us -EPERM on lookup of that page. With the code as is we change it into
a "page missing" error which a guest may get confused about. Instead, just
tell the caller about the -EPERM directly.

This fixes Mac OS X guests when run with DCBZ32 emulation.

Signed-off-by: Alexander Graf <agraf@suse.de>
---

diff --git a/arch/powerpc/kvm/book3s.c b/arch/powerpc/kvm/book3s.c
index bd75902b38ba..9624c5644103 100644
--- a/arch/powerpc/kvm/book3s.c
+++ b/arch/powerpc/kvm/book3s.c
@@ -418,11 +418,13 @@ int kvmppc_st(struct kvm_vcpu *vcpu, ulong *eaddr, int size, void *ptr,
 	      bool data)
 {
 	struct kvmppc_pte pte;
+	int r;
 
 	vcpu->stat.st++;
 
-	if (kvmppc_xlate(vcpu, *eaddr, data, true, &pte))
-		return -ENOENT;
+	r = kvmppc_xlate(vcpu, *eaddr, data, true, &pte);
+	if (r < 0)
+		return r;
 
 	*eaddr = pte.raddr;