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Thu, 11 Jun 2020 12:02:07 +0000 (GMT) Received: from b03ledav003.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id 457706A05F; Thu, 11 Jun 2020 12:02:06 +0000 (GMT) Received: from skywalker.ibmuc.com (unknown [9.199.62.196]) by b03ledav003.gho.boulder.ibm.com (Postfix) with ESMTP; Thu, 11 Jun 2020 12:02:05 +0000 (GMT) From: "Aneesh Kumar K.V" To: paulus@ozlabs.org, kvm-ppc@vger.kernel.org Subject: [PATCH] powerpc/kvm/book3s64/nested: Fix kernel crash with nested kvm Date: Thu, 11 Jun 2020 17:31:59 +0530 Message-Id: <20200611120159.680284-1-aneesh.kumar@linux.ibm.com> X-Mailer: git-send-email 2.26.2 MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-11_11:2020-06-10, 2020-06-11 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 mlxscore=0 phishscore=0 suspectscore=0 lowpriorityscore=0 priorityscore=1501 spamscore=0 adultscore=0 clxscore=1015 bulkscore=0 mlxlogscore=684 malwarescore=0 impostorscore=0 cotscore=-2147483648 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006110091 X-BeenThere: linuxppc-dev@lists.ozlabs.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: Linux on PowerPC Developers Mail List List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: "Aneesh Kumar K.V" , linuxppc-dev@lists.ozlabs.org Errors-To: linuxppc-dev-bounces+linuxppc-dev=archiver.kernel.org@lists.ozlabs.org Sender: "Linuxppc-dev" __pa() do check for addr value passed and if < PAGE_OFFSET results in BUG. #define __pa(x) \ ({ \ VIRTUAL_BUG_ON((unsigned long)(x) < PAGE_OFFSET); \ (unsigned long)(x) & 0x0fffffffffffffffUL; \ }) kvmhv_copy_tofrom_guest_radix() use a NULL value for to/from to indicate direction of copy. Avoid calling __pa() if the value is NULL 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 .... [c0000018a2187670] c000000000161d5c kvmhv_copy_from_guest_radix+0x3c/0x80 [c0000018a21876b0] c00000000014feb8 kvmhv_load_from_eaddr+0x48/0xc0 [c0000018a21876e0] c000000000135828 kvmppc_ld+0x98/0x1e0 [c0000018a2187780] c00000000013bc20 kvmppc_load_last_inst+0x50/0x90 [c0000018a21877b0] c00000000015e9e8 kvmppc_hv_emulate_mmio+0x288/0x2b0 [c0000018a2187810] c000000000164888 kvmppc_book3s_radix_page_fault+0xd8/0x2b0 [c0000018a21878c0] c00000000015ed8c kvmppc_book3s_hv_page_fault+0x37c/0x1050 [c0000018a2187a00] c00000000015a518 kvmppc_vcpu_run_hv+0xbb8/0x1080 [c0000018a2187b20] c00000000013d204 kvmppc_vcpu_run+0x34/0x50 [c0000018a2187b40] c00000000013949c kvm_arch_vcpu_ioctl_run+0x2fc/0x410 [c0000018a2187bd0] c00000000012a2a4 kvm_vcpu_ioctl+0x2b4/0x8f0 [c0000018a2187d50] c0000000005b12a4 ksys_ioctl+0xf4/0x150 [c0000018a2187da0] c0000000005b1328 sys_ioctl+0x28/0x80 [c0000018a2187dc0] c000000000030584 system_call_exception+0x104/0x1d0 [c0000018a2187e20] c00000000000ca68 system_call_common+0xe8/0x214 Signed-off-by: Aneesh Kumar K.V --- 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 02219e28b1e4..84acb4769487 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) -- 2.26.2