From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Google-Smtp-Source: AIpwx49u8pIdkHDYvgZq8psIM4zLQoD77ZK6W2E8jmmcpcVuMJ3vXhFM4VOhdec68IADOs2kIuKZ ARC-Seal: i=1; a=rsa-sha256; t=1523981022; cv=none; d=google.com; s=arc-20160816; b=O2PcnEzEf7eUoJHNMUhcSBiyPjIN5J6Z8hI4xgvWdqWxOzCn5k50LjT8CXOpFuWCgm kPNl1CXs4gnIMB7XZp9A4L3PkO/FrCDtaaoL4lqqXOrIkejZUkJZcdWl/TlvXymwQ2B0 tPs9HGpH3hRExBuDvOyXagFVxBATBumy3sNVOTWIROEit6AqstTamBHJfXGzocjMqd7v KXpaeNWdzHRyrONmA3arPNtnAwmJLuC0oxEOLJD5AszriaNWV8eCPrsyLPpsd4Ks9KpU FHS6u52YU66tavsRor6ot9ynRQRxXIRBGBE7CMmt/zir/a5UeSurYinWoucnSi40cxIk tQ1w== ARC-Message-Signature: i=1; a=rsa-sha256; c=relaxed/relaxed; d=google.com; s=arc-20160816; h=mime-version:user-agent:references:in-reply-to:message-id:date :subject:cc:to:from:arc-authentication-results; bh=De5WKk5TzimG5mODcI/+Q4cj8qTyBaxfDisoCPphDXA=; b=ZzXrS27CN+l5M4OOkKGa0N5KLssCy+zGJNGuTYPRyrfpPoQyi0zCNG/DWqagSJOf8O OFyJCm4maNJWc4duN0CCpN45j3nEZ9JSzofi8mK6OaTTh8znNEmjO+SZOACpBAMfcDK9 mMXofJK3YKDhYEQN4vCvGipmGkRD4wdOPHxJCfnOnei6DYu6ZtCeQtKZlefk8/NOuQL0 blKXsUhw5cdCsBsX2cK54FEbSQ7xJo2ANhzutClu+FpqKbu/qiNzqsvTDbWA2/hO6aPk NXknJt2QbVwmr5ryETjHHYNy5fAB8UqorPwm3PdMU/VTFndPkjPayM0aXAk6DoS9dPK+ R/nA== ARC-Authentication-Results: i=1; mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 46.44.180.42 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org Authentication-Results: mx.google.com; spf=softfail (google.com: domain of transitioning gregkh@linuxfoundation.org does not designate 46.44.180.42 as permitted sender) smtp.mailfrom=gregkh@linuxfoundation.org From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, Nicholas Piggin , Michael Ellerman Subject: [PATCH 4.15 20/53] KVM: PPC: Book3S HV: trace_tlbie must not be called in realmode Date: Tue, 17 Apr 2018 17:58:45 +0200 Message-Id: <20180417155724.087762346@linuxfoundation.org> X-Mailer: git-send-email 2.17.0 In-Reply-To: <20180417155723.091120060@linuxfoundation.org> References: <20180417155723.091120060@linuxfoundation.org> User-Agent: quilt/0.65 X-stable: review MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 X-getmail-retrieved-from-mailbox: INBOX X-GMAIL-LABELS: =?utf-8?b?IlxcU2VudCI=?= X-GMAIL-THRID: =?utf-8?q?1598009728604177210?= X-GMAIL-MSGID: =?utf-8?q?1598009924631594789?= X-Mailing-List: linux-kernel@vger.kernel.org List-ID: 4.15-stable review patch. If anyone has any objections, please let me know. ------------------ From: Nicholas Piggin commit 19ce7909ed11c49f7eddf59e7f49cd3062bf83d5 upstream. This crashes with a "Bad real address for load" attempting to load from the vmalloc region in realmode (faulting address is in DAR). Oops: Bad interrupt in KVM entry/exit code, sig: 6 [#1] LE SMP NR_CPUS=2048 NUMA PowerNV CPU: 53 PID: 6582 Comm: qemu-system-ppc Not tainted 4.16.0-01530-g43d1859f0994 NIP: c0000000000155ac LR: c0000000000c2430 CTR: c000000000015580 REGS: c000000fff76dd80 TRAP: 0200 Not tainted (4.16.0-01530-g43d1859f0994) MSR: 9000000000201003 CR: 48082222 XER: 00000000 CFAR: 0000000102900ef0 DAR: d00017fffd941a28 DSISR: 00000040 SOFTE: 3 NIP [c0000000000155ac] perf_trace_tlbie+0x2c/0x1a0 LR [c0000000000c2430] do_tlbies+0x230/0x2f0 I suspect the reason is the per-cpu data is not in the linear chunk. This could be restored if that was able to be fixed, but for now, just remove the tracepoints. Fixes: 0428491cba92 ("powerpc/mm: Trace tlbie(l) instructions") Cc: stable@vger.kernel.org # v4.13+ Signed-off-by: Nicholas Piggin Signed-off-by: Michael Ellerman Signed-off-by: Greg Kroah-Hartman --- arch/powerpc/kvm/book3s_hv_rm_mmu.c | 4 ---- 1 file changed, 4 deletions(-) --- a/arch/powerpc/kvm/book3s_hv_rm_mmu.c +++ b/arch/powerpc/kvm/book3s_hv_rm_mmu.c @@ -470,8 +470,6 @@ static void do_tlbies(struct kvm *kvm, u for (i = 0; i < npages; ++i) { asm volatile(PPC_TLBIE_5(%0,%1,0,0,0) : : "r" (rbvalues[i]), "r" (kvm->arch.lpid)); - trace_tlbie(kvm->arch.lpid, 0, rbvalues[i], - kvm->arch.lpid, 0, 0, 0); } asm volatile("eieio; tlbsync; ptesync" : : : "memory"); kvm->arch.tlbie_lock = 0; @@ -481,8 +479,6 @@ static void do_tlbies(struct kvm *kvm, u for (i = 0; i < npages; ++i) { asm volatile(PPC_TLBIEL(%0,%1,0,0,0) : : "r" (rbvalues[i]), "r" (0)); - trace_tlbie(kvm->arch.lpid, 1, rbvalues[i], - 0, 0, 0, 0); } asm volatile("ptesync" : : : "memory"); }