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From ef0563a3c3f32680e0584821eccd9a205e371b34 Mon Sep 17 00:00:00 2001
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From: Jon Maloy <jmaloy@redhat.com>
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Date: Mon, 5 Dec 2022 15:32:55 -0500
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Subject: [PATCH 3/6] hw/display/qxl: Document qxl_phys2virt()
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MIME-Version: 1.0
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Content-Type: text/plain; charset=UTF-8
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Content-Transfer-Encoding: 8bit
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 242: hw/display/qxl: Have qxl_log_command Return early if no log_cmd handler
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RH-Bugzilla: 2152085
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RH-Acked-by: Gerd Hoffmann <kraxel@redhat.com>
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RH-Acked-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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RH-Acked-by: Stefan Hajnoczi <stefanha@redhat.com>
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RH-Commit: [2/5] 8d1045449270a3aef4bc4b39c61da1592b83259a (jmaloy/jons-qemu-kvm)
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BZ: https://bugzilla.redhat.com/show_bug.cgi?id=2152085
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CVE: CVE-2022-4144
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Upstream: Merged
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commit b1901de83a9456cde26fc755f71ca2b7b3ef50fc
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Author: Philippe Mathieu-Daudé <philmd@linaro.org>
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Date: Mon Nov 28 21:27:38 2022 +0100
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hw/display/qxl: Document qxl_phys2virt()
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Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Philippe Mathieu-Daudé <philmd@linaro.org>
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Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com>
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Message-Id: <20221128202741.4945-3-philmd@linaro.org>
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(cherry picked from commit b1901de83a9456cde26fc755f71ca2b7b3ef50fc)
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/display/qxl.h | 19 +++++++++++++++++++
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1 file changed, 19 insertions(+)
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diff --git a/hw/display/qxl.h b/hw/display/qxl.h
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index 30d21f4d0b..c938f88a2f 100644
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--- a/hw/display/qxl.h
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+++ b/hw/display/qxl.h
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@@ -147,6 +147,25 @@ OBJECT_DECLARE_SIMPLE_TYPE(PCIQXLDevice, PCI_QXL)
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#define QXL_DEFAULT_REVISION (QXL_REVISION_STABLE_V12 + 1)
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/* qxl.c */
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+/**
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+ * qxl_phys2virt: Get a pointer within a PCI VRAM memory region.
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+ *
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+ * @qxl: QXL device
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+ * @phys: physical offset of buffer within the VRAM
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+ * @group_id: memory slot group
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+ *
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+ * Returns a host pointer to a buffer placed at offset @phys within the
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+ * active slot @group_id of the PCI VGA RAM memory region associated with
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+ * the @qxl device. If the slot is inactive, or the offset is out
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+ * of the memory region, returns NULL.
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+ *
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+ * Use with care; by the time this function returns, the returned pointer is
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+ * not protected by RCU anymore. If the caller is not within an RCU critical
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+ * section and does not hold the iothread lock, it must have other means of
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+ * protecting the pointer, such as a reference to the region that includes
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+ * the incoming ram_addr_t.
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+ *
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+ */
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void *qxl_phys2virt(PCIQXLDevice *qxl, QXLPHYSICAL phys, int group_id);
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void qxl_set_guest_bug(PCIQXLDevice *qxl, const char *msg, ...)
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GCC_FMT_ATTR(2, 3);
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--
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2.37.3
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