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[83.51.162.1]) by smtp.gmail.com with ESMTPSA id w2sm22168661wrs.77.2020.06.25.11.48.58 (version=TLS1_3 cipher=TLS_AES_256_GCM_SHA384 bits=256/256); Thu, 25 Jun 2020 11:48:58 -0700 (PDT) From: =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= To: qemu-devel@nongnu.org, Stefan Hajnoczi Subject: [PATCH 04/17] block/nvme: Be explicit we share NvmeIdCtrl / NvmeIdNs structures Date: Thu, 25 Jun 2020 20:48:25 +0200 Message-Id: <20200625184838.28172-5-philmd@redhat.com> X-Mailer: git-send-email 2.21.3 In-Reply-To: <20200625184838.28172-1-philmd@redhat.com> References: <20200625184838.28172-1-philmd@redhat.com> MIME-Version: 1.0 X-Mimecast-Spam-Score: 0 X-Mimecast-Originator: redhat.com Received-SPF: pass client-ip=205.139.110.120; envelope-from=philmd@redhat.com; helo=us-smtp-1.mimecast.com X-detected-operating-system: by eggs.gnu.org: First seen = 2020/06/25 00:45:15 X-ACL-Warn: Detected OS = Linux 2.2.x-3.x [generic] [fuzzy] X-Spam_score_int: -30 X-Spam_score: -3.1 X-Spam_bar: --- X-Spam_report: (-3.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-1, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=-0.01, RCVD_IN_MSPIKE_WL=-0.01, SPF_HELO_NONE=0.001, SPF_PASS=-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: Fam Zheng , Kevin Wolf , qemu-block@nongnu.org, Max Reitz , Maxim Levitsky , =?utf-8?q?Philippe_Mathieu-Daud=C3=A9?= Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" We allocate an unique chunk of memory then use it for two different structures. Introduce the 'idsz_max' variable to hold the maximum size, to make it clearer the size is enough to hold the two structures. Signed-off-by: Philippe Mathieu-Daudé --- FIXME: reword with something that makes more sense... --- block/nvme.c | 6 ++++-- 1 file changed, 4 insertions(+), 2 deletions(-) diff --git a/block/nvme.c b/block/nvme.c index 71f8cf27a8..ffda804a8e 100644 --- a/block/nvme.c +++ b/block/nvme.c @@ -438,6 +438,7 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp) BDRVNVMeState *s = bs->opaque; NvmeIdCtrl *idctrl; NvmeIdNs *idns; + size_t idsz_max; NvmeLBAF *lbaf; uint8_t *resp; uint16_t oncs; @@ -448,14 +449,15 @@ static void nvme_identify(BlockDriverState *bs, int namespace, Error **errp) .cdw10 = cpu_to_le32(0x1), }; - resp = qemu_try_blockalign0(bs, sizeof(NvmeIdCtrl)); + idsz_max = MAX_CONST(sizeof(NvmeIdCtrl), sizeof(NvmeIdNs)); + resp = qemu_try_blockalign0(bs, idsz_max); if (!resp) { error_setg(errp, "Cannot allocate buffer for identify response"); goto out; } idctrl = (NvmeIdCtrl *)resp; idns = (NvmeIdNs *)resp; - r = qemu_vfio_dma_map(s->vfio, resp, sizeof(NvmeIdCtrl), true, &iova); + r = qemu_vfio_dma_map(s->vfio, resp, idsz_max, true, &iova); if (r) { error_setg(errp, "Cannot map buffer for DMA"); goto out;