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Tue, 16 Jun 2020 20:57:30 +0000 (GMT) Received: from b03ledav006.gho.boulder.ibm.com (unknown [127.0.0.1]) by IMSVA (Postfix) with ESMTP id C0B87C605B; Tue, 16 Jun 2020 20:57:29 +0000 (GMT) Received: from sbct-3.pok.ibm.com (unknown [9.47.158.153]) by b03ledav006.gho.boulder.ibm.com (Postfix) with ESMTP; Tue, 16 Jun 2020 20:57:29 +0000 (GMT) From: Stefan Berger To: qemu-devel@nongnu.org Subject: [PATCH v3 7/8] tpm: Guard irq related ops in case interrupts are disabled Date: Tue, 16 Jun 2020 16:57:20 -0400 Message-Id: <20200616205721.1191408-8-stefanb@linux.vnet.ibm.com> X-Mailer: git-send-email 2.24.1 In-Reply-To: <20200616205721.1191408-1-stefanb@linux.vnet.ibm.com> References: <20200616205721.1191408-1-stefanb@linux.vnet.ibm.com> MIME-Version: 1.0 X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.216, 18.0.687 definitions=2020-06-16_12:2020-06-16, 2020-06-16 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 priorityscore=1501 impostorscore=0 mlxscore=0 phishscore=0 spamscore=0 bulkscore=0 lowpriorityscore=0 adultscore=0 cotscore=-2147483648 malwarescore=0 mlxlogscore=955 suspectscore=1 clxscore=1015 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2004280000 definitions=main-2006160140 Received-SPF: none client-ip=148.163.156.1; envelope-from=stefanb@linux.vnet.ibm.com; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/16 16:57:28 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -35 X-Spam_score: -3.6 X-Spam_bar: --- X-Spam_report: (-3.6 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-1, SPF_HELO_NONE=0.001, SPF_NONE=0.001 autolearn=_AUTOLEARN X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Cc: Stefan Berger , eric.auger@redhat.com, pbonzini@redhat.com, marcandre.lureau@redhat.com, philmd@redhat.com, mkedzier@redhat.com, Stefan Berger Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" Check for irq_num having the value of TPM_IRQ_DISABLED before calling any IRQ related functions or allowing the user to try to enable interrupts. Explicitly allow the value of TPM_IRQ_DISABLED in irq_num. Signed-off-by: Stefan Berger --- hw/tpm/tpm_tis_common.c | 12 +++++++++++- hw/tpm/tpm_tis_isa.c | 6 ++++-- 2 files changed, 15 insertions(+), 3 deletions(-) diff --git a/hw/tpm/tpm_tis_common.c b/hw/tpm/tpm_tis_common.c index 0f42696f1f..13b233309e 100644 --- a/hw/tpm/tpm_tis_common.c +++ b/hw/tpm/tpm_tis_common.c @@ -359,7 +359,11 @@ static uint64_t tpm_tis_mmio_read(void *opaque, hwaddr addr, val = s->loc[locty].inte; break; case TPM_TIS_REG_INT_VECTOR: - val = s->irq_num; + if (s->irq_num != TPM_IRQ_DISABLED) { + val = s->irq_num; + } else { + val = 0; + } break; case TPM_TIS_REG_INT_STATUS: val = s->loc[locty].ints; @@ -591,6 +595,9 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr, if (s->active_locty != locty) { break; } + if (s->irq_num == TPM_IRQ_DISABLED) { + val &= ~TPM_TIS_INT_ENABLED; + } s->loc[locty].inte &= mask; s->loc[locty].inte |= (val & (TPM_TIS_INT_ENABLED | @@ -601,6 +608,9 @@ static void tpm_tis_mmio_write(void *opaque, hwaddr addr, /* hard wired -- ignore */ break; case TPM_TIS_REG_INT_STATUS: + if (s->irq_num == TPM_IRQ_DISABLED) { + break; + } /* clearing of interrupt flags */ if (((val & TPM_TIS_INTERRUPTS_SUPPORTED)) && (s->loc[locty].ints & TPM_TIS_INTERRUPTS_SUPPORTED)) { diff --git a/hw/tpm/tpm_tis_isa.c b/hw/tpm/tpm_tis_isa.c index 27222a9a49..d72f733ead 100644 --- a/hw/tpm/tpm_tis_isa.c +++ b/hw/tpm/tpm_tis_isa.c @@ -127,13 +127,15 @@ static void tpm_tis_isa_realizefn(DeviceState *dev, Error **errp) error_setg(errp, "'tpmdev' property is required"); return; } - if (s->irq_num > 15) { + if (s->irq_num > 15 && s->irq_num != TPM_IRQ_DISABLED) { error_setg(errp, "IRQ %d is outside valid range of 0 to 15", s->irq_num); return; } - isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num); + if (s->irq_num != TPM_IRQ_DISABLED) { + isa_init_irq(ISA_DEVICE(dev), &s->irq, s->irq_num); + } memory_region_add_subregion(isa_address_space(ISA_DEVICE(dev)), TPM_TIS_ADDR_BASE, &s->mmio);