From 0e3b855ea8223c8150192820cde86def8142de29 Mon Sep 17 00:00:00 2001 From: =?UTF-8?q?Marc-Andr=C3=A9=20Lureau?= Date: Tue, 5 Feb 2019 11:25:50 +0000 Subject: [PATCH 1/2] qemu-ga: make get-fsinfo work over pci bridges MIME-Version: 1.0 Content-Type: text/plain; charset=UTF-8 Content-Transfer-Encoding: 8bit RH-Author: Marc-André Lureau Message-id: <20190205112551.14763-2-marcandre.lureau@redhat.com> Patchwork-id: 84241 O-Subject: [RHEL8/rhel qemu-kvm PATCH 1/2] qemu-ga: make get-fsinfo work over pci bridges Bugzilla: 1666952 RH-Acked-by: Laszlo Ersek RH-Acked-by: Philippe Mathieu-Daudé RH-Acked-by: Danilo de Paula Iterate over the PCI bridges to lookup the PCI device associated with the block device. This allows to lookup the driver under the following syspath: /sys/devices/pci0000:00/0000:00:02.2/0000:03:00.0/virtio2/block/vda/vda3 It also works with an "old-style" Q35 libvirt hierarchy: root complex -> DMI-PCI bridge -> PCI-PCI bridge -> virtio controller, ex: /sys/devices/pci0000:00/0000:00:03.0/0000:01:01.0/0000:02:01.0/virtio1/block/vda/vda3 The setup can be reproduced with the following qemu command line (Thanks Marcel for help): qemu-system-x86_64 -M q35 \ -device i82801b11-bridge,id=dmi2pci_bridge,bus=pcie.0 -device pci-bridge,id=pci_bridge,bus=dmi2pci_bridge,addr=0x1,chassis_nr=1 -device virtio-blk-pci,scsi=off,drive=drive-virtio-disk0,id=virtio-disk0,bootindex=1,bus=pci_bridge,addr=0x1 For consistency with other syspath-related debug messages, replace a \"%s\" in the message with '%s'. Fixes: https://bugzilla.redhat.com/show_bug.cgi?id=1567041 Signed-off-by: Marc-André Lureau Reviewed-by: Laszlo Ersek Signed-off-by: Michael Roth (cherry picked from commit 743c71d03c20d64f2bae5fba6f26cdf5e4b1bda6) Signed-off-by: Marc-André Lureau Signed-off-by: Danilo C. L. de Paula --- qga/commands-posix.c | 23 +++++++++++++++++++---- 1 file changed, 19 insertions(+), 4 deletions(-) diff --git a/qga/commands-posix.c b/qga/commands-posix.c index 82cb120..71cb644 100644 --- a/qga/commands-posix.c +++ b/qga/commands-posix.c @@ -883,13 +883,28 @@ static void build_guest_fsinfo_for_real_device(char const *syspath, p = strstr(syspath, "/devices/pci"); if (!p || sscanf(p + 12, "%*x:%*x/%x:%x:%x.%x%n", pci, pci + 1, pci + 2, pci + 3, &pcilen) < 4) { - g_debug("only pci device is supported: sysfs path \"%s\"", syspath); + g_debug("only pci device is supported: sysfs path '%s'", syspath); return; } - driver = get_pci_driver(syspath, (p + 12 + pcilen) - syspath, errp); - if (!driver) { - goto cleanup; + p += 12 + pcilen; + while (true) { + driver = get_pci_driver(syspath, p - syspath, errp); + if (driver && (g_str_equal(driver, "ata_piix") || + g_str_equal(driver, "sym53c8xx") || + g_str_equal(driver, "virtio-pci") || + g_str_equal(driver, "ahci"))) { + break; + } + + if (sscanf(p, "/%x:%x:%x.%x%n", + pci, pci + 1, pci + 2, pci + 3, &pcilen) == 4) { + p += pcilen; + continue; + } + + g_debug("unsupported driver or sysfs path '%s'", syspath); + return; } p = strstr(syspath, "/target"); -- 1.8.3.1