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d="scan'208";a="2602754" From: Anthony PERARD To: Date: Thu, 4 Jul 2019 15:42:23 +0100 Message-ID: <20190704144233.27968-26-anthony.perard@citrix.com> X-Mailer: git-send-email 2.22.0 In-Reply-To: <20190704144233.27968-1-anthony.perard@citrix.com> References: <20190704144233.27968-1-anthony.perard@citrix.com> MIME-Version: 1.0 Subject: [Xen-devel] [PATCH v3 25/35] OvmfPkg/XenPlatformPei: Reserve VGA memory region, to boot Linux X-BeenThere: xen-devel@lists.xenproject.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: Xen developer discussion List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , Cc: Ard Biesheuvel , Jordan Justen , Julien Grall , Anthony PERARD , xen-devel@lists.xenproject.org, Laszlo Ersek Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: quoted-printable Errors-To: xen-devel-bounces@lists.xenproject.org Sender: "Xen-devel" Linux panic if the VGA region isn't reserved. When Linux is booted on EFI system, it expects the memory at 0xa0000 to _not_ be conventional memory. Otherwise a variable isn't initialised properly and Linux panic when a virtual console/terminal is asked to be created. See for more detail: https://lists.xenproject.org/archives/html/xen-devel/2019-03/msg02139.html Ref: https://bugzilla.tianocore.org/show_bug.cgi?id=3D1689 Signed-off-by: Anthony PERARD Acked-by: Laszlo Ersek --- Notes: v3: - fix commit message OvmfPkg/XenPlatformPei/Xen.c | 16 ++++++++++++++++ 1 file changed, 16 insertions(+) diff --git a/OvmfPkg/XenPlatformPei/Xen.c b/OvmfPkg/XenPlatformPei/Xen.c index 62a2c3ed93..9866b7c212 100644 --- a/OvmfPkg/XenPlatformPei/Xen.c +++ b/OvmfPkg/XenPlatformPei/Xen.c @@ -291,6 +291,12 @@ XenPublishRamRegions ( Status =3D XenGetE820Map (&E820Map, &E820EntriesCount); ASSERT_EFI_ERROR (Status); =20 + AddMemoryBaseSizeHob (0, 0xA0000); + // + // Video memory + Legacy BIOS region, to allow Linux to boot. + // + AddReservedMemoryBaseSizeHob (0xA0000, BASE_1MB - 0xA0000, TRUE); + for (Index =3D 0; Index < E820EntriesCount; Index++) { UINT64 Base; UINT64 End; @@ -304,6 +310,16 @@ XenPublishRamRegions ( Base =3D ALIGN_VALUE (Entry->BaseAddr, (UINT64)EFI_PAGE_SIZE); End =3D (Entry->BaseAddr + Entry->Length) & ~(UINT64)EFI_PAGE_MASK; =20 + // + // Ignore the first 1MB, this is handled before the loop. + // + if (Base < BASE_1MB) { + Base =3D BASE_1MB; + } + if (Base >=3D End) { + continue; + } + switch (Entry->Type) { case EfiAcpiAddressRangeMemory: AddMemoryRangeHob (Base, End); --=20 Anthony PERARD _______________________________________________ Xen-devel mailing list Xen-devel@lists.xenproject.org https://lists.xenproject.org/mailman/listinfo/xen-devel