From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from eggs.gnu.org ([2001:4830:134:3::10]:40722) by lists.gnu.org with esmtp (Exim 4.71) (envelope-from ) id 1ctXAe-0001cJ-6f for qemu-devel@nongnu.org; Thu, 30 Mar 2017 06:19:18 -0400 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1ctXAZ-0002Jx-9j for qemu-devel@nongnu.org; Thu, 30 Mar 2017 06:19:12 -0400 Received: from mga05.intel.com ([192.55.52.43]:52199) by eggs.gnu.org with esmtps (TLS1.0:DHE_RSA_AES_256_CBC_SHA1:32) (Exim 4.71) (envelope-from ) id 1ctXAY-0002Jc-Um for qemu-devel@nongnu.org; Thu, 30 Mar 2017 06:19:07 -0400 From: Xiong Zhang Date: Thu, 30 Mar 2017 18:27:21 +0800 Message-Id: <1490869641-29873-1-git-send-email-xiong.y.zhang@intel.com> Subject: [Qemu-devel] [PATCH] Revert "vfio/pci-quirks.c: Disable stolen memory for igd VFIO" List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , To: alex.williamson@redhat.com Cc: qemu-devel@nongnu.org, Xiong Zhang This reverts commit c2b2e158cc7b1cb431bd6039824ec13c3184a775. The original patch intend to prevent linux i915 driver from using stolen meory. But this patch breaks windows IGD driver loading on Gen9+, as IGD HW will use stolen memory on Gen9+, once windows IGD driver see zero size stolen memory, it will unload. Meanwhile stolen memory will be disabled in 915 when i915 run as a guest. Signed-off-by: Xiong Zhang --- hw/vfio/pci-quirks.c | 65 ++++++++++++++++++++++------------------------------ 1 file changed, 27 insertions(+), 38 deletions(-) diff --git a/hw/vfio/pci-quirks.c b/hw/vfio/pci-quirks.c index e995e32..e9b493b 100644 --- a/hw/vfio/pci-quirks.c +++ b/hw/vfio/pci-quirks.c @@ -1367,45 +1367,14 @@ static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) uint16_t cmd_orig, cmd; Error *err = NULL; - /* This must be an Intel VGA device. */ - if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) || - !vfio_is_vga(vdev) || nr != 4) { - return; - } - - /* - * IGD is not a standard, they like to change their specs often. We - * only attempt to support back to SandBridge and we hope that newer - * devices maintain compatibility with generation 8. - */ - gen = igd_gen(vdev); - if (gen != 6 && gen != 8) { - error_report("IGD device %s is unsupported by IGD quirks, " - "try SandyBridge or newer", vdev->vbasedev.name); - return; - } - - /* - * Regardless of running in UPT or legacy mode, the guest graphics - * driver may attempt to use stolen memory, however only legacy mode - * has BIOS support for reserving stolen memory in the guest VM. - * Emulate the GMCH register in all cases and zero out the stolen - * memory size here. Legacy mode may request allocation and re-write - * this below. - */ - gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, 4); - gmch &= ~((gen < 8 ? 0x1f : 0xff) << (gen < 8 ? 3 : 8)); - - /* GMCH is read-only, emulated */ - pci_set_long(vdev->pdev.config + IGD_GMCH, gmch); - pci_set_long(vdev->pdev.wmask + IGD_GMCH, 0); - pci_set_long(vdev->emulated_config_bits + IGD_GMCH, ~0); - /* - * This must be at address 00:02.0 for us to even onsider enabling - * legacy mode. The vBIOS has dependencies on the PCI bus address. + * This must be an Intel VGA device at address 00:02.0 for us to even + * consider enabling legacy mode. The vBIOS has dependencies on the + * PCI bus address. */ - if (&vdev->pdev != pci_find_device(pci_device_root_bus(&vdev->pdev), + if (!vfio_pci_is(vdev, PCI_VENDOR_ID_INTEL, PCI_ANY_ID) || + !vfio_is_vga(vdev) || nr != 4 || + &vdev->pdev != pci_find_device(pci_device_root_bus(&vdev->pdev), 0, PCI_DEVFN(0x2, 0))) { return; } @@ -1425,6 +1394,18 @@ static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) } /* + * IGD is not a standard, they like to change their specs often. We + * only attempt to support back to SandBridge and we hope that newer + * devices maintain compatibility with generation 8. + */ + gen = igd_gen(vdev); + if (gen != 6 && gen != 8) { + error_report("IGD device %s is unsupported in legacy mode, " + "try SandyBridge or newer", vdev->vbasedev.name); + return; + } + + /* * Most of what we're doing here is to enable the ROM to run, so if * there's no ROM, there's no point in setting up this quirk. * NB. We only seem to get BIOS ROMs, so a UEFI VM would need CSM support. @@ -1479,6 +1460,8 @@ static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) goto out; } + gmch = vfio_pci_read_config(&vdev->pdev, IGD_GMCH, 4); + /* * If IGD VGA Disable is clear (expected) and VGA is not already enabled, * try to enable it. Probably shouldn't be using legacy mode without VGA, @@ -1549,11 +1532,12 @@ static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) * when IVD (IGD VGA Disable) is clear, but the claim is that it's unused, * so let's not waste VM memory for it. */ + gmch &= ~((gen < 8 ? 0x1f : 0xff) << (gen < 8 ? 3 : 8)); + if (vdev->igd_gms) { if (vdev->igd_gms <= 0x10) { gms_mb = vdev->igd_gms * 32; gmch |= vdev->igd_gms << (gen < 8 ? 3 : 8); - pci_set_long(vdev->pdev.config + IGD_GMCH, gmch); } else { error_report("Unsupported IGD GMS value 0x%x", vdev->igd_gms); vdev->igd_gms = 0; @@ -1573,6 +1557,11 @@ static void vfio_probe_igd_bar4_quirk(VFIOPCIDevice *vdev, int nr) fw_cfg_add_file(fw_cfg_find(), "etc/igd-bdsm-size", bdsm_size, sizeof(*bdsm_size)); + /* GMCH is read-only, emulated */ + pci_set_long(vdev->pdev.config + IGD_GMCH, gmch); + pci_set_long(vdev->pdev.wmask + IGD_GMCH, 0); + pci_set_long(vdev->emulated_config_bits + IGD_GMCH, ~0); + /* BDSM is read-write, emulated. The BIOS needs to be able to write it */ pci_set_long(vdev->pdev.config + IGD_BDSM, 0); pci_set_long(vdev->pdev.wmask + IGD_BDSM, ~0); -- 1.9.1