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Mon, 5 Oct 2020 16:52:00 +0000 (GMT) Received: from smtp.tlslab.ibm.com (unknown [9.101.4.1]) by d06av26.portsmouth.uk.ibm.com (Postfix) with SMTP; Mon, 5 Oct 2020 16:52:00 +0000 (GMT) Received: from yukon.ibmuc.com (sig-9-145-2-207.uk.ibm.com [9.145.2.207]) by smtp.tlslab.ibm.com (Postfix) with ESMTP id 494572201BC; Mon, 5 Oct 2020 18:51:59 +0200 (CEST) From: =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= To: David Gibson Subject: [PATCH v2 4/6] spapr/xive: Enforce load-after-store ordering Date: Mon, 5 Oct 2020 18:51:45 +0200 Message-Id: <20201005165147.526426-5-clg@kaod.org> X-Mailer: git-send-email 2.25.4 In-Reply-To: <20201005165147.526426-1-clg@kaod.org> References: <20201005165147.526426-1-clg@kaod.org> MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: quoted-printable X-TM-AS-GCONF: 00 X-Proofpoint-Virus-Version: vendor=fsecure engine=2.50.10434:6.0.235, 18.0.687 definitions=2020-10-05_11:2020-10-05, 2020-10-05 signatures=0 X-Proofpoint-Spam-Details: rule=outbound_notspam policy=outbound score=0 clxscore=1034 bulkscore=0 mlxscore=0 adultscore=0 malwarescore=0 lowpriorityscore=0 priorityscore=1501 impostorscore=0 suspectscore=0 phishscore=0 spamscore=0 mlxlogscore=801 classifier=spam adjust=0 reason=mlx scancount=1 engine=8.12.0-2006250000 definitions=main-2010050117 Received-SPF: softfail client-ip=148.163.156.1; envelope-from=clg@kaod.org; helo=mx0a-001b2d01.pphosted.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/10/05 12:52:09 X-ACL-Warn: Detected OS = Linux 3.x [generic] [fuzzy] X-Spam_score_int: -18 X-Spam_score: -1.9 X-Spam_bar: - X-Spam_report: (-1.9 / 5.0 requ) BAYES_00=-1.9, RCVD_IN_DNSWL_LOW=-0.7, RCVD_IN_MSPIKE_H2=-0.001, SPF_HELO_NONE=0.001, SPF_SOFTFAIL=0.665 autolearn=no autolearn_force=no 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: qemu-devel@nongnu.org, =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , qemu-ppc@nongnu.org, Greg Kurz , Gustavo Romero Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: "Qemu-devel" The XIVE_ESB_SET_PQ_10 load operation is used to disable temporarily an interrupt source. If StoreEOI is active, a source could be left enabled if the load and store operations come out of order. QEMU makes use of this offset to quiesce the sources before a migration. Enforce the load-after-store ordering always when doing so without querying the characteristics of the sources on the host. The performance penalty will be very small for QEMU. Signed-off-by: C=C3=A9dric Le Goater --- include/hw/ppc/xive.h | 8 ++++++++ hw/intc/spapr_xive_kvm.c | 12 ++++++++++++ hw/intc/xive.c | 6 ++++++ 3 files changed, 26 insertions(+) diff --git a/include/hw/ppc/xive.h b/include/hw/ppc/xive.h index 445eccfe6b73..39cd273f86d5 100644 --- a/include/hw/ppc/xive.h +++ b/include/hw/ppc/xive.h @@ -279,6 +279,14 @@ static inline hwaddr xive_source_esb_mgmt(XiveSource= *xsrc, int srcno) #define XIVE_ESB_SET_PQ_10 0xe00 /* Load */ #define XIVE_ESB_SET_PQ_11 0xf00 /* Load */ =20 +/* + * Load-after-store ordering + * + * Adding this offset to the load address will enforce + * load-after-store ordering. This is required to use with StoreEOI. + */ +#define XIVE_ESB_LD_ST_MO 0x40 /* Load-after-store ordering */ + uint8_t xive_source_esb_get(XiveSource *xsrc, uint32_t srcno); uint8_t xive_source_esb_set(XiveSource *xsrc, uint32_t srcno, uint8_t pq= ); =20 diff --git a/hw/intc/spapr_xive_kvm.c b/hw/intc/spapr_xive_kvm.c index 66bf4c06fe55..d428422a7b72 100644 --- a/hw/intc/spapr_xive_kvm.c +++ b/hw/intc/spapr_xive_kvm.c @@ -357,6 +357,18 @@ static uint64_t xive_esb_rw(XiveSource *xsrc, int sr= cno, uint32_t offset, =20 static uint8_t xive_esb_read(XiveSource *xsrc, int srcno, uint32_t offse= t) { + /* + * The XIVE_ESB_SET_PQ_10 load operation is used to disable + * temporarily an interrupt source. If StoreEOI is active, a + * source could be left enabled if the load and store operations + * come out of order. + * + * Enforce the load-after-store ordering always. + */ + if (offset =3D=3D XIVE_ESB_SET_PQ_10) { + offset |=3D XIVE_ESB_LD_ST_MO; + } + return xive_esb_rw(xsrc, srcno, offset, 0, 0) & 0x3; } =20 diff --git a/hw/intc/xive.c b/hw/intc/xive.c index 489e6256ef70..b710ba2df095 100644 --- a/hw/intc/xive.c +++ b/hw/intc/xive.c @@ -998,6 +998,12 @@ static uint64_t xive_source_esb_read(void *opaque, h= waddr addr, unsigned size) case XIVE_ESB_SET_PQ_01 ... XIVE_ESB_SET_PQ_01 + 0x0FF: case XIVE_ESB_SET_PQ_10 ... XIVE_ESB_SET_PQ_10 + 0x0FF: case XIVE_ESB_SET_PQ_11 ... XIVE_ESB_SET_PQ_11 + 0x0FF: + if (offset =3D=3D XIVE_ESB_SET_PQ_10 && + xsrc->esb_flags & XIVE_SRC_STORE_EOI) { + qemu_log_mask(LOG_GUEST_ERROR, "XIVE: load-after-store order= ing " + "not enforced with Store EOI active for IRQ %d= \n", + srcno); + } ret =3D xive_source_esb_set(xsrc, srcno, (offset >> 8) & 0x3); break; default: --=20 2.25.4