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72 lines
2.5 KiB
72 lines
2.5 KiB
1 year ago
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From 8f19df61a101c1e57a1bce8adddb57a4a7123a77 Mon Sep 17 00:00:00 2001
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From: Thomas Huth <thuth@redhat.com>
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Date: Tue, 16 May 2023 11:05:56 +0200
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Subject: [PATCH 11/15] lsi53c895a: disable reentrancy detection for MMIO
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region, too
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RH-Author: Jon Maloy <jmaloy@redhat.com>
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RH-MergeRequest: 277: memory: prevent dma-reentracy issues
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RH-Bugzilla: 1999236
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RH-Acked-by: Thomas Huth <thuth@redhat.com>
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RH-Acked-by: Miroslav Rezanina <mrezanin@redhat.com>
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RH-Commit: [11/12] 8016c86f8432f5ea06c831d1181e87e6d45a6a50 (redhat/rhel/src/qemu-kvm/jons-qemu-kvm-2)
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Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1999236
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Upstream: Merged
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CVE: CVE-2021-3750
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commit d139fe9ad8a27bcc50b4ead77d2f97d191a0e95e
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Author: Thomas Huth <thuth@redhat.com>
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Date: Tue May 16 11:05:56 2023 +0200
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lsi53c895a: disable reentrancy detection for MMIO region, too
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While trying to use a SCSI disk on the LSI controller with an
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older version of Fedora (25), I'm getting:
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qemu: warning: Blocked re-entrant IO on MemoryRegion: lsi-mmio at addr: 0x34
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and the SCSI controller is not usable. Seems like we have to
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disable the reentrancy checker for the MMIO region, too, to
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get this working again.
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The problem could be reproduced it like this:
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./qemu-system-x86_64 -accel kvm -m 2G -machine q35 \
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-device lsi53c810,id=lsi1 -device scsi-hd,drive=d0 \
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-drive if=none,id=d0,file=.../somedisk.qcow2 \
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-cdrom Fedora-Everything-netinst-i386-25-1.3.iso
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Where somedisk.qcow2 is an image that contains already some partitions
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and file systems.
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In the boot menu of Fedora, go to
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"Troubleshooting" -> "Rescue a Fedora system" -> "3) Skip to shell"
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Then check "dmesg | grep -i 53c" for failure messages, and try to mount
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a partition from somedisk.qcow2.
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Message-Id: <20230516090556.553813-1-thuth@redhat.com>
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Signed-off-by: Thomas Huth <thuth@redhat.com>
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Signed-off-by: Jon Maloy <jmaloy@redhat.com>
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---
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hw/scsi/lsi53c895a.c | 1 +
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1 file changed, 1 insertion(+)
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diff --git a/hw/scsi/lsi53c895a.c b/hw/scsi/lsi53c895a.c
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index 1e15e13fbf..2b9cb2ac5d 100644
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--- a/hw/scsi/lsi53c895a.c
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+++ b/hw/scsi/lsi53c895a.c
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@@ -2306,6 +2306,7 @@ static void lsi_scsi_realize(PCIDevice *dev, Error **errp)
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* re-entrancy guard.
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*/
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s->ram_io.disable_reentrancy_guard = true;
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+ s->mmio_io.disable_reentrancy_guard = true;
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address_space_init(&s->pci_io_as, pci_address_space_io(dev), "lsi-pci-io");
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qdev_init_gpio_out(d, &s->ext_irq, 1);
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--
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2.37.3
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