From: Gerd Hoffmann <kraxel@redhat.com> To: qemu-devel@nongnu.org Cc: igvt-g@ml01.01.org, xen-devel@lists.xensource.com, Eduardo Habkost <ehabkost@redhat.com>, Stefano Stabellini <stefano.stabellini@eu.citrix.com>, Cao jin <caoj.fnst@cn.fujitsu.com>, vfio-users@redhat.com, Gerd Hoffmann <kraxel@redhat.com> Subject: [Qemu-devel] [PATCH v3 07/11] igd: revamp host config read Date: Tue, 5 Jan 2016 12:41:34 +0100 [thread overview] Message-ID: <1451994098-6972-8-git-send-email-kraxel@redhat.com> (raw) In-Reply-To: <1451994098-6972-1-git-send-email-kraxel@redhat.com> Move all work to the host_pci_config_copy helper function, which we can easily reuse when adding q35 support. Open sysfs file only once for all values. Use pread. Proper error handling. Fix bugs: * Don't throw away results (like old host_pci_config_read did because val was passed by value not reference). * Update config space directly (writing via pci_default_write_config only works for registers whitelisted in wmask). Hmm, this code can hardly ever worked before, /me wonders what test coverage it had. With this patch in place igd-passthru=on actually works, although it still requires root priviledges because linux refuses to allow non-root users access pci config space above offset 0x50. Signed-off-by: Gerd Hoffmann <kraxel@redhat.com> --- hw/pci-host/igd.c | 65 +++++++++++++++++++++++-------------------------------- 1 file changed, 27 insertions(+), 38 deletions(-) diff --git a/hw/pci-host/igd.c b/hw/pci-host/igd.c index 0784128..ec48875 100644 --- a/hw/pci-host/igd.c +++ b/hw/pci-host/igd.c @@ -19,47 +19,39 @@ static const IGDHostInfo igd_host_bridge_infos[] = { {0xa8, 4}, /* SNB: base of GTT stolen memory */ }; -static int host_pci_config_read(int pos, int len, uint32_t val) +static void host_pci_config_copy(PCIDevice *guest, const char *host, + const IGDHostInfo *list, int len, Error **errp) { - char path[PATH_MAX]; - int config_fd; - ssize_t size = sizeof(path); - /* Access real host bridge. */ - int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s", - 0, 0, 0, 0, "config"); - int ret = 0; + char *path; + int config_fd, rc, i; - if (rc >= size || rc < 0) { - return -ENODEV; - } - - config_fd = open(path, O_RDWR); + path = g_strdup_printf("/sys/bus/pci/devices/%s/config", host); + config_fd = open(path, O_RDONLY); if (config_fd < 0) { - return -ENODEV; + error_setg_file_open(errp, errno, path); + goto out_free; } - if (lseek(config_fd, pos, SEEK_SET) != pos) { - ret = -errno; - goto out; + for (i = 0; i < len; i++) { + rc = pread(config_fd, guest->config + list[i].offset, + list[i].len, list[i].offset); + if (rc != list[i].len) { + error_setg_errno(errp, errno, "read %s, offset 0x%x", + path, list[i].offset); + goto out_close; + } } - do { - rc = read(config_fd, (uint8_t *)&val, len); - } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); - if (rc != len) { - ret = -errno; - } -out: + +out_close: close(config_fd); - return ret; +out_free: + g_free(path); } static void (*i440fx_realize)(PCIDevice *pci_dev, Error **errp); static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) { Error *err = NULL; - uint32_t val = 0; - int rc, i, num; - int pos, len; i440fx_realize(pci_dev, &err); if (err != NULL) { @@ -67,16 +59,13 @@ static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) return; } - num = ARRAY_SIZE(igd_host_bridge_infos); - for (i = 0; i < num; i++) { - pos = igd_host_bridge_infos[i].offset; - len = igd_host_bridge_infos[i].len; - rc = host_pci_config_read(pos, len, val); - if (rc) { - error_setg(errp, "failed to read host config"); - return; - } - pci_default_write_config(pci_dev, pos, val, len); + host_pci_config_copy(pci_dev, "0000:00:00.0", + igd_host_bridge_infos, + ARRAY_SIZE(igd_host_bridge_infos), + &err); + if (err != NULL) { + error_propagate(errp, err); + return; } } -- 1.8.3.1
WARNING: multiple messages have this Message-ID (diff)
From: Gerd Hoffmann <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> To: qemu-devel-qX2TKyscuCcdnm+yROfE0A@public.gmane.org Cc: igvt-g-y27Ovi1pjclAfugRpC6u6w@public.gmane.org, xen-devel-GuqFBffKawuULHF6PoxzQEEOCMrvLtNR@public.gmane.org, Eduardo Habkost <ehabkost-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org>, Stefano Stabellini <stefano.stabellini-mvvWK6WmYclDPfheJLI6IQ@public.gmane.org>, Cao jin <caoj.fnst-BthXqXjhjHXQFUHtdCDX3A@public.gmane.org>, vfio-users-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org Subject: [PATCH v3 07/11] igd: revamp host config read Date: Tue, 5 Jan 2016 12:41:34 +0100 [thread overview] Message-ID: <1451994098-6972-8-git-send-email-kraxel@redhat.com> (raw) In-Reply-To: <1451994098-6972-1-git-send-email-kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> Move all work to the host_pci_config_copy helper function, which we can easily reuse when adding q35 support. Open sysfs file only once for all values. Use pread. Proper error handling. Fix bugs: * Don't throw away results (like old host_pci_config_read did because val was passed by value not reference). * Update config space directly (writing via pci_default_write_config only works for registers whitelisted in wmask). Hmm, this code can hardly ever worked before, /me wonders what test coverage it had. With this patch in place igd-passthru=on actually works, although it still requires root priviledges because linux refuses to allow non-root users access pci config space above offset 0x50. Signed-off-by: Gerd Hoffmann <kraxel-H+wXaHxf7aLQT0dZR+AlfA@public.gmane.org> --- hw/pci-host/igd.c | 65 +++++++++++++++++++++++-------------------------------- 1 file changed, 27 insertions(+), 38 deletions(-) diff --git a/hw/pci-host/igd.c b/hw/pci-host/igd.c index 0784128..ec48875 100644 --- a/hw/pci-host/igd.c +++ b/hw/pci-host/igd.c @@ -19,47 +19,39 @@ static const IGDHostInfo igd_host_bridge_infos[] = { {0xa8, 4}, /* SNB: base of GTT stolen memory */ }; -static int host_pci_config_read(int pos, int len, uint32_t val) +static void host_pci_config_copy(PCIDevice *guest, const char *host, + const IGDHostInfo *list, int len, Error **errp) { - char path[PATH_MAX]; - int config_fd; - ssize_t size = sizeof(path); - /* Access real host bridge. */ - int rc = snprintf(path, size, "/sys/bus/pci/devices/%04x:%02x:%02x.%d/%s", - 0, 0, 0, 0, "config"); - int ret = 0; + char *path; + int config_fd, rc, i; - if (rc >= size || rc < 0) { - return -ENODEV; - } - - config_fd = open(path, O_RDWR); + path = g_strdup_printf("/sys/bus/pci/devices/%s/config", host); + config_fd = open(path, O_RDONLY); if (config_fd < 0) { - return -ENODEV; + error_setg_file_open(errp, errno, path); + goto out_free; } - if (lseek(config_fd, pos, SEEK_SET) != pos) { - ret = -errno; - goto out; + for (i = 0; i < len; i++) { + rc = pread(config_fd, guest->config + list[i].offset, + list[i].len, list[i].offset); + if (rc != list[i].len) { + error_setg_errno(errp, errno, "read %s, offset 0x%x", + path, list[i].offset); + goto out_close; + } } - do { - rc = read(config_fd, (uint8_t *)&val, len); - } while (rc < 0 && (errno == EINTR || errno == EAGAIN)); - if (rc != len) { - ret = -errno; - } -out: + +out_close: close(config_fd); - return ret; +out_free: + g_free(path); } static void (*i440fx_realize)(PCIDevice *pci_dev, Error **errp); static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) { Error *err = NULL; - uint32_t val = 0; - int rc, i, num; - int pos, len; i440fx_realize(pci_dev, &err); if (err != NULL) { @@ -67,16 +59,13 @@ static void igd_pt_i440fx_realize(PCIDevice *pci_dev, Error **errp) return; } - num = ARRAY_SIZE(igd_host_bridge_infos); - for (i = 0; i < num; i++) { - pos = igd_host_bridge_infos[i].offset; - len = igd_host_bridge_infos[i].len; - rc = host_pci_config_read(pos, len, val); - if (rc) { - error_setg(errp, "failed to read host config"); - return; - } - pci_default_write_config(pci_dev, pos, val, len); + host_pci_config_copy(pci_dev, "0000:00:00.0", + igd_host_bridge_infos, + ARRAY_SIZE(igd_host_bridge_infos), + &err); + if (err != NULL) { + error_propagate(errp, err); + return; } } -- 1.8.3.1
next prev parent reply other threads:[~2016-01-05 11:42 UTC|newest] Thread overview: 132+ messages / expand[flat|nested] mbox.gz Atom feed top 2016-01-05 11:41 [Qemu-devel] [PATCH v3 00/11] igd passthrough chipset tweaks Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 01/11] pc: wire up TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE for !xen Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 02/11] pc: remove has_igd_gfx_passthru global Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 14:32 ` [Qemu-devel] [Xen-devel] " Stefano Stabellini 2016-01-06 14:32 ` Stefano Stabellini 2016-01-19 15:09 ` [Qemu-devel] " Eduardo Habkost 2016-01-19 15:09 ` Eduardo Habkost 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 03/11] pc: move igd support code to igd.c Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 04/11] igd: switch TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE to realize Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 14:32 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 14:32 ` Stefano Stabellini 2016-01-23 14:51 ` [Qemu-devel] " Eduardo Habkost 2016-01-23 14:51 ` Eduardo Habkost 2016-01-25 8:59 ` [Qemu-devel] " Gerd Hoffmann 2016-01-25 8:59 ` Gerd Hoffmann 2016-01-25 11:53 ` [Qemu-devel] " Stefano Stabellini 2016-01-25 11:53 ` Stefano Stabellini 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 05/11] igd: TYPE_IGD_PASSTHROUGH_I440FX_PCI_DEVICE: call parent realize Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 14:41 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 14:41 ` Stefano Stabellini 2016-01-06 15:45 ` [Qemu-devel] " Gerd Hoffmann 2016-01-06 15:45 ` Gerd Hoffmann 2016-01-19 15:13 ` [Qemu-devel] " Eduardo Habkost 2016-01-19 15:13 ` Eduardo Habkost 2016-01-20 9:10 ` [Qemu-devel] " Gerd Hoffmann 2016-01-20 9:10 ` Gerd Hoffmann 2016-01-23 14:52 ` [Qemu-devel] " Eduardo Habkost 2016-01-23 14:52 ` Eduardo Habkost 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 06/11] igd: use defines for standard pci config space offsets Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 14:43 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 14:43 ` Stefano Stabellini 2016-01-05 11:41 ` Gerd Hoffmann [this message] 2016-01-05 11:41 ` [PATCH v3 07/11] igd: revamp host config read Gerd Hoffmann 2016-01-06 15:02 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 15:02 ` Stefano Stabellini 2016-01-06 15:51 ` [Qemu-devel] " Gerd Hoffmann 2016-01-06 15:51 ` Gerd Hoffmann 2016-01-06 16:23 ` [Qemu-devel] [Xen-devel] " Stefano Stabellini 2016-01-06 16:23 ` Stefano Stabellini 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 08/11] igd: add q35 support Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 09/11] igd: move igd-passthrough-isa-bridge to igd.c too Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 10/11] igd: handle igd-passthrough-isa-bridge setup in realize() Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 15:29 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 15:29 ` Stefano Stabellini 2016-01-06 15:52 ` [Qemu-devel] " Gerd Hoffmann 2016-01-06 15:52 ` Gerd Hoffmann 2016-01-05 11:41 ` [Qemu-devel] [PATCH v3 11/11] igd: move igd-passthrough-isa-bridge creation to machine init Gerd Hoffmann 2016-01-05 11:41 ` Gerd Hoffmann 2016-01-06 15:36 ` [Qemu-devel] " Stefano Stabellini 2016-01-06 15:36 ` Stefano Stabellini 2016-01-07 7:38 ` [Qemu-devel] " Gerd Hoffmann 2016-01-07 7:38 ` Gerd Hoffmann 2016-01-07 13:10 ` [Qemu-devel] " Stefano Stabellini 2016-01-07 13:10 ` Stefano Stabellini 2016-01-07 15:50 ` [Qemu-devel] " Gerd Hoffmann 2016-01-07 15:50 ` Gerd Hoffmann 2016-01-08 11:20 ` Stefano Stabellini 2016-01-08 11:20 ` Stefano Stabellini 2016-01-08 12:12 ` [Qemu-devel] " Stefano Stabellini 2016-01-08 12:12 ` Stefano Stabellini 2016-01-08 12:32 ` Gerd Hoffmann 2016-01-08 12:32 ` Gerd Hoffmann 2016-01-08 12:38 ` [Qemu-devel] " Stefano Stabellini 2016-01-08 12:38 ` Stefano Stabellini 2016-01-05 13:07 ` [Qemu-devel] [PATCH v3 00/11] igd passthrough chipset tweaks Michael S. Tsirkin 2016-01-05 13:07 ` Michael S. Tsirkin 2016-01-28 19:35 ` [Qemu-devel] [vfio-users] " Alex Williamson 2016-01-28 19:35 ` Alex Williamson 2016-01-29 2:22 ` [Qemu-devel] [iGVT-g] " Kay, Allen M 2016-01-29 2:22 ` Kay, Allen M 2016-01-29 2:54 ` [Qemu-devel] " Alex Williamson 2016-01-29 2:54 ` Alex Williamson 2016-01-29 6:21 ` [Qemu-devel] " Jike Song 2016-01-29 6:21 ` Jike Song 2016-01-29 21:58 ` [Qemu-devel] " Kay, Allen M 2016-01-29 21:58 ` Kay, Allen M 2016-02-02 7:07 ` [Qemu-devel] " Tian, Kevin 2016-02-02 7:07 ` Tian, Kevin 2016-02-02 19:10 ` [Qemu-devel] " Kay, Allen M 2016-02-02 19:10 ` [iGVT-g] " Kay, Allen M 2016-02-02 19:37 ` [Qemu-devel] [iGVT-g] [vfio-users] " Alex Williamson 2016-02-02 19:37 ` Alex Williamson 2016-02-02 23:32 ` [Qemu-devel] " Kay, Allen M 2016-02-02 23:32 ` Kay, Allen M 2016-01-29 7:09 ` [Qemu-devel] " Gerd Hoffmann 2016-01-29 7:09 ` Gerd Hoffmann 2016-01-29 17:59 ` [Qemu-devel] " Alex Williamson 2016-01-29 17:59 ` Alex Williamson 2016-01-30 1:18 ` [Qemu-devel] [iGVT-g] " Kay, Allen M 2016-01-30 1:18 ` Kay, Allen M 2016-01-31 17:42 ` [Qemu-devel] " Alex Williamson 2016-01-31 17:42 ` Alex Williamson 2016-02-02 0:04 ` [Qemu-devel] " Kay, Allen M 2016-02-02 0:04 ` Kay, Allen M 2016-02-02 6:42 ` [Qemu-devel] [Xen-devel] " Tian, Kevin 2016-02-02 6:42 ` Tian, Kevin 2016-02-02 11:50 ` [Qemu-devel] " David Woodhouse 2016-02-02 11:50 ` David Woodhouse 2016-02-02 14:54 ` [Qemu-devel] " Alex Williamson 2016-02-02 14:54 ` Alex Williamson 2016-02-02 15:06 ` [Qemu-devel] " David Woodhouse 2016-02-02 15:06 ` David Woodhouse 2016-02-02 14:38 ` [Qemu-devel] " Alex Williamson 2016-02-02 14:38 ` Alex Williamson 2016-02-01 12:49 ` [Qemu-devel] " Gerd Hoffmann 2016-02-01 12:49 ` Gerd Hoffmann 2016-02-01 22:16 ` [Qemu-devel] " Alex Williamson 2016-02-01 22:16 ` Alex Williamson 2016-02-02 7:43 ` [Qemu-devel] [vfio-users] " Gerd Hoffmann 2016-02-02 7:43 ` Gerd Hoffmann 2016-02-02 7:01 ` [Qemu-devel] [iGVT-g] " Tian, Kevin 2016-02-02 7:01 ` [iGVT-g] " Tian, Kevin 2016-02-02 8:56 ` [Qemu-devel] [iGVT-g] [vfio-users] " Gerd Hoffmann 2016-02-02 8:56 ` Gerd Hoffmann 2016-02-02 16:31 ` [Qemu-devel] " Kevin O'Connor 2016-02-02 16:31 ` Kevin O'Connor 2016-02-02 16:49 ` [Qemu-devel] " Laszlo Ersek 2016-02-02 16:49 ` Laszlo Ersek 2016-02-02 20:18 ` [Qemu-devel] " Alex Williamson 2016-02-02 20:18 ` Alex Williamson 2016-02-03 6:08 ` [Qemu-devel] " Tian, Kevin 2016-02-03 6:08 ` Tian, Kevin
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