From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org X-Spam-Level: X-Spam-Status: No, score=-13.0 required=3.0 tests=BAYES_00,DKIMWL_WL_HIGH, DKIM_SIGNED,DKIM_VALID,HEADER_FROM_DIFFERENT_DOMAINS,INCLUDES_PATCH, MAILING_LIST_MULTI,SIGNED_OFF_BY,SPF_HELO_NONE,SPF_PASS,URIBL_BLOCKED, USER_AGENT_GIT autolearn=unavailable autolearn_force=no version=3.4.0 Received: from mail.kernel.org (mail.kernel.org [198.145.29.99]) by smtp.lore.kernel.org (Postfix) with ESMTP id 66224C433E5 for ; Tue, 14 Jul 2020 18:55:29 +0000 (UTC) Received: from vger.kernel.org (vger.kernel.org [23.128.96.18]) by mail.kernel.org (Postfix) with ESMTP id 46654222B9 for ; Tue, 14 Jul 2020 18:55:29 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752929; bh=fPe011OLFDAOSHoiDlWJVfsAghT2Lhh8LX4jqLUHjJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:List-ID:From; b=jQUIdnaAe1nDkyIfJD4hozqYhMB+V7NznqM3qQ3vODxFZDjaz4ic6grOpAWwMOKHP t3RUTG4D3wU4prj+ohz2k4Un5wMhXj/pc9pSHsyIoAqpLvcBJdO6I21o3nCC2BGkrk dkavufNUy+ky3r+InJ1oYwvDFTf311x72RV1CByE= Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1730869AbgGNSz2 (ORCPT ); Tue, 14 Jul 2020 14:55:28 -0400 Received: from mail.kernel.org ([198.145.29.99]:53156 "EHLO mail.kernel.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1730043AbgGNSz1 (ORCPT ); Tue, 14 Jul 2020 14:55:27 -0400 Received: from localhost (83-86-89-107.cable.dynamic.v4.ziggo.nl [83.86.89.107]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by mail.kernel.org (Postfix) with ESMTPSA id 4CD8822282; Tue, 14 Jul 2020 18:55:26 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=default; t=1594752926; bh=fPe011OLFDAOSHoiDlWJVfsAghT2Lhh8LX4jqLUHjJs=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=Lvvp6rqcyJYdDkWt+mhIVrgWp4NgSOnYfpSE29H7iBuUd8jkoGclcGFjFUQUGnM9q +JEY3LqcKV0JZJQqnQ+rZ2X/aJju47oHEwlFebLS2NfByeyNAIfdZus7g42t4ekK7r RueTRy0VaVuycy36qvqmCLbl/5dVS0PlDeU//w/4= From: Greg Kroah-Hartman To: linux-kernel@vger.kernel.org Cc: Greg Kroah-Hartman , stable@vger.kernel.org, "Aneesh Kumar K.V" , Michael Ellerman , Sasha Levin Subject: [PATCH 5.7 026/166] powerpc/kvm/book3s64: Fix kernel crash with nested kvm & DEBUG_VIRTUAL Date: Tue, 14 Jul 2020 20:43:11 +0200 Message-Id: <20200714184117.137205413@linuxfoundation.org> X-Mailer: git-send-email 2.27.0 In-Reply-To: <20200714184115.844176932@linuxfoundation.org> References: <20200714184115.844176932@linuxfoundation.org> User-Agent: quilt/0.66 MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit Sender: stable-owner@vger.kernel.org Precedence: bulk List-ID: X-Mailing-List: stable@vger.kernel.org From: Aneesh Kumar K.V [ Upstream commit c1ed1754f271f6b7acb1bfdc8cfb62220fbed423 ] With CONFIG_DEBUG_VIRTUAL=y, __pa() checks for addr value and if it's less than PAGE_OFFSET it leads to a BUG(). #define __pa(x) ({ VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET); (unsigned long)(x) & 0x0fffffffffffffffUL; }) kernel BUG at arch/powerpc/kvm/book3s_64_mmu_radix.c:43! cpu 0x70: Vector: 700 (Program Check) at [c0000018a2187360] pc: c000000000161b30: __kvmhv_copy_tofrom_guest_radix+0x130/0x1f0 lr: c000000000161d5c: kvmhv_copy_from_guest_radix+0x3c/0x80 ... kvmhv_copy_from_guest_radix+0x3c/0x80 kvmhv_load_from_eaddr+0x48/0xc0 kvmppc_ld+0x98/0x1e0 kvmppc_load_last_inst+0x50/0x90 kvmppc_hv_emulate_mmio+0x288/0x2b0 kvmppc_book3s_radix_page_fault+0xd8/0x2b0 kvmppc_book3s_hv_page_fault+0x37c/0x1050 kvmppc_vcpu_run_hv+0xbb8/0x1080 kvmppc_vcpu_run+0x34/0x50 kvm_arch_vcpu_ioctl_run+0x2fc/0x410 kvm_vcpu_ioctl+0x2b4/0x8f0 ksys_ioctl+0xf4/0x150 sys_ioctl+0x28/0x80 system_call_exception+0x104/0x1d0 system_call_common+0xe8/0x214 kvmhv_copy_tofrom_guest_radix() uses a NULL value for to/from to indicate direction of copy. Avoid calling __pa() if the value is NULL to avoid the BUG(). Signed-off-by: Aneesh Kumar K.V [mpe: Massage change log a bit to mention CONFIG_DEBUG_VIRTUAL] Signed-off-by: Michael Ellerman Link: https://lore.kernel.org/r/20200611120159.680284-1-aneesh.kumar@linux.ibm.com Signed-off-by: Sasha Levin --- arch/powerpc/kvm/book3s_64_mmu_radix.c | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) diff --git a/arch/powerpc/kvm/book3s_64_mmu_radix.c b/arch/powerpc/kvm/book3s_64_mmu_radix.c index d4e532a63f08e..2f27faf24b2cb 100644 --- a/arch/powerpc/kvm/book3s_64_mmu_radix.c +++ b/arch/powerpc/kvm/book3s_64_mmu_radix.c @@ -40,7 +40,8 @@ unsigned long __kvmhv_copy_tofrom_guest_radix(int lpid, int pid, /* Can't access quadrants 1 or 2 in non-HV mode, call the HV to do it */ if (kvmhv_on_pseries()) return plpar_hcall_norets(H_COPY_TOFROM_GUEST, lpid, pid, eaddr, - __pa(to), __pa(from), n); + (to != NULL) ? __pa(to): 0, + (from != NULL) ? __pa(from): 0, n); quadrant = 1; if (!pid) -- 2.25.1