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From 0e3b855ea8223c8150192820cde86def8142de29 Mon Sep 17 00:00:00 2001
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From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= <marcandre.lureau@redhat.com>
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Date: Tue, 5 Feb 2019 11:25:50 +0000
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Subject: [PATCH 1/2] qemu-ga: make get-fsinfo work over pci bridges
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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: Marc-André Lureau <marcandre.lureau@redhat.com>
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Message-id: <20190205112551.14763-2-marcandre.lureau@redhat.com>
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Patchwork-id: 84241
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O-Subject: [RHEL8/rhel qemu-kvm PATCH 1/2] qemu-ga: make get-fsinfo work over pci bridges
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Bugzilla: 1666952
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RH-Acked-by: Laszlo Ersek <lersek@redhat.com>
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RH-Acked-by: Philippe Mathieu-Daudé <philmd@redhat.com>
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RH-Acked-by: Danilo de Paula <ddepaula@redhat.com>
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Iterate over the PCI bridges to lookup the PCI device associated with
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the block device.
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This allows to lookup the driver under the following syspath:
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/sys/devices/pci0000:00/0000:00:02.2/0000:03:00.0/virtio2/block/vda/vda3
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It also works with an "old-style" Q35 libvirt hierarchy: root complex
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-> DMI-PCI bridge -> PCI-PCI bridge -> virtio controller, ex:
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/sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:01.0/virtio1/block/vda/vda3
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The setup can be reproduced with the following qemu command line
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(Thanks Marcel for help):
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qemu-system-x86_64 -M q35 \
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-device i82801b11-bridge,id=dmi2pci_bridge,bus=pcie.0
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-device pci-bridge,id=pci_bridge,bus=dmi2pci_bridge,addr=0x1,chassis_nr=1
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-device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,bus=pci_bridge,addr=0x1
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For consistency with other syspath-related debug messages, replace a
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\"%s\" in the message with '%s'.
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Fixes:
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https://bugzilla.redhat.com/show_bug.cgi?id=1567041
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Reviewed-by: Laszlo Ersek <lersek@redhat.com>
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Signed-off-by: Michael Roth <mdroth@linux.vnet.ibm.com>
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(cherry picked from commit 743c71d03c20d64f2bae5fba6f26cdf5e4b1bda6)
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Signed-off-by: Marc-André Lureau <marcandre.lureau@redhat.com>
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Signed-off-by: Danilo C. L. de Paula <ddepaula@redhat.com>
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---
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qga/commands-posix.c | 23 +++++++++++++++++++----
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1 file changed, 19 insertions(+), 4 deletions(-)
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diff --git a/qga/commands-posix.c b/qga/commands-posix.c
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index 82cb120..71cb644 100644
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--- a/qga/commands-posix.c
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+++ b/qga/commands-posix.c
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@@ -883,13 +883,28 @@ static void build_guest_fsinfo_for_real_device(char const *syspath,
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p = strstr(syspath, "/devices/pci");
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if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n",
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pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) {
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- g_debug("only pci device is supported: sysfs path \"%s\"", syspath);
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+ g_debug("only pci device is supported: sysfs path '%s'", syspath);
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return;
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}
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- driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp);
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- if (!driver) {
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- goto cleanup;
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+ p += 12 + pcilen;
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+ while (true) {
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+ driver = get_pci_driver(syspath, p - syspath, errp);
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+ if (driver && (g_str_equal(driver, "ata_piix") ||
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+ g_str_equal(driver, "sym53c8xx") ||
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+ g_str_equal(driver, "virtio-pci") ||
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+ g_str_equal(driver, "ahci"))) {
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+ break;
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+ }
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+
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+ if (sscanf(p, "/%x:%x:%x.%x%n",
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+ pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) {
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+ p += pcilen;
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+ continue;
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+ }
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+
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+ g_debug("unsupported driver or sysfs path '%s'", syspath);
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+ return;
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}
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p = strstr(syspath, "/target");
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--
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1.8.3.1
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