From mboxrd@z Thu Jan 1 00:00:00 1970 Authentication-Results: mx.groups.io; dkim=missing; spf=pass (domain: redhat.com, ip: 209.132.183.28, mailfrom: lersek@redhat.com) Received: from mx1.redhat.com (mx1.redhat.com [209.132.183.28]) by groups.io with SMTP; Wed, 29 May 2019 08:12:32 -0700 Received: from smtp.corp.redhat.com (int-mx06.intmail.prod.int.phx2.redhat.com [10.5.11.16]) (using TLSv1.2 with cipher AECDH-AES256-SHA (256/256 bits)) (No client certificate requested) by mx1.redhat.com (Postfix) with ESMTPS id DC33930C0DED; Wed, 29 May 2019 15:12:30 +0000 (UTC) Received: from lacos-laptop-7.usersys.redhat.com (ovpn-120-170.rdu2.redhat.com [10.10.120.170]) by smtp.corp.redhat.com (Postfix) with ESMTP id 28F0D4DA; Wed, 29 May 2019 15:12:28 +0000 (UTC) From: "Laszlo Ersek" To: edk2-devel-groups-io Cc: Ard Biesheuvel , Gerd Hoffmann , Jordan Justen Subject: [PATCH for-edk2-stable201905 3/6] Revert "OvmfPkg/PlatformPei: hoist PciBase assignment above the i440fx/q35 branching" Date: Wed, 29 May 2019 17:12:06 +0200 Message-Id: <20190529151209.17503-4-lersek@redhat.com> In-Reply-To: <20190529151209.17503-1-lersek@redhat.com> References: <20190529151209.17503-1-lersek@redhat.com> MIME-Version: 1.0 X-Scanned-By: MIMEDefang 2.79 on 10.5.11.16 X-Greylist: Sender IP whitelisted, not delayed by milter-greylist-4.5.16 (mx1.redhat.com [10.5.110.45]); Wed, 29 May 2019 15:12:30 +0000 (UTC) Content-Transfer-Encoding: quoted-printable This reverts commit 9a2e8d7c65ef7f39c6754d27e52954b616bc6628. The original fix for triggered a bug / incorrect assumption in QEMU. QEMU assumes that the PCIEXBAR is below the 32-bit PCI window, not above it. When the firmware doesn't satisfy this assumption, QEMU generates an \_SB.PCI0._CRS object in the ACPI DSDT that does not reflect the firmware's 32-bit MMIO BAR assignments. This causes OSes to re-assign 32-bit MMIO BARs. Working around the problem in the firmware looks less problematic than fixing QEMU. Revert the original changes first, before implementing an alternative fix. Cc: Ard Biesheuvel Cc: Gerd Hoffmann Cc: Jordan Justen Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3D1859 Signed-off-by: Laszlo Ersek --- OvmfPkg/PlatformPei/Platform.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platfor= m.c index 9c013613a1a0..5e0a15484230 100644 --- a/OvmfPkg/PlatformPei/Platform.c +++ b/OvmfPkg/PlatformPei/Platform.c @@ -181,7 +181,6 @@ MemMapInitialization ( =20 TopOfLowRam =3D GetSystemMemorySizeBelow4gb (); PciExBarBase =3D 0; - PciBase =3D (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam; if (mHostBridgeDevId =3D=3D INTEL_Q35_MCH_DEVICE_ID) { // // The MMCONFIG area is expected to fall between the top of low RA= M and @@ -193,6 +192,7 @@ MemMapInitialization ( PciBase =3D (UINT32)(PciExBarBase + SIZE_256MB); PciSize =3D 0xFC000000 - PciBase; } else { + PciBase =3D (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam; PciSize =3D 0xFC000000 - PciBase; } =20 --=20 2.19.1.3.g30247aa5d201