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 08:12:38 -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 B011B7F7C8; Wed, 29 May 2019 15:12:37 +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 41BB879423; Wed, 29 May 2019 15:12:31 +0000 (UTC) From: "Laszlo Ersek" To: edk2-devel-groups-io Cc: Ard Biesheuvel , Gerd Hoffmann , Jordan Justen Subject: [PATCH for-edk2-stable201905 4/6] Revert "OvmfPkg/PlatformPei: assign PciSize on both i440fx/q35 branches explicitly" Date: Wed, 29 May 2019 17:12:07 +0200 Message-Id: <20190529151209.17503-5-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 [10.5.110.28]); Wed, 29 May 2019 15:12:37 +0000 (UTC) Content-Transfer-Encoding: quoted-printable This reverts commit 60e95bf5094fbb9b728729ccfaf32184b3662317. 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 | 3 +-- 1 file changed, 1 insertion(+), 2 deletions(-) diff --git a/OvmfPkg/PlatformPei/Platform.c b/OvmfPkg/PlatformPei/Platfor= m.c index 5e0a15484230..0876316eefbc 100644 --- a/OvmfPkg/PlatformPei/Platform.c +++ b/OvmfPkg/PlatformPei/Platform.c @@ -190,10 +190,8 @@ MemMapInitialization ( ASSERT (TopOfLowRam <=3D PciExBarBase); ASSERT (PciExBarBase <=3D MAX_UINT32 - SIZE_256MB); PciBase =3D (UINT32)(PciExBarBase + SIZE_256MB); - PciSize =3D 0xFC000000 - PciBase; } else { PciBase =3D (TopOfLowRam < BASE_2GB) ? BASE_2GB : TopOfLowRam; - PciSize =3D 0xFC000000 - PciBase; } =20 // @@ -209,6 +207,7 @@ MemMapInitialization ( // 0xFED20000 gap 896 KB // 0xFEE00000 LAPIC 1 MB // + PciSize =3D 0xFC000000 - PciBase; AddIoMemoryBaseSizeHob (PciBase, PciSize); PcdStatus =3D PcdSet64S (PcdPciMmio32Base, PciBase); ASSERT_RETURN_ERROR (PcdStatus); --=20 2.19.1.3.g30247aa5d201