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s=mimecast20190719; t=1699362195; h=from:from:reply-to:subject:subject:date:date:message-id:message-id: to:to:cc:cc:mime-version:mime-version: content-transfer-encoding:content-transfer-encoding; bh=IOHWcwclobqdsl9Xg2Xkt/KeeQp53aVoWqBsmhryhLo=; b=iWI+oiBTpuwqJWnOA3ArybrDfk+ZpkmBDgkNmKtHkeHt8YBwPaAaGhuh5HDEbJY0cBo2Zy ZfvLq8ccofn7MAMrhwyhUy+xcA7H1EdY+F3l2NOtCkTU2e22310UTtEvZCyudLbgZdOWJ2 RYIhq7ndUXtLQiuBy3Sa0zqriTNVWCc= X-MC-Unique: lZ6B-x-SMoiWxFHVZjCrlA-1 From: Gerd Hoffmann To: seabios@seabios.org Cc: qemu-devel@nongnu.org, Gerd Hoffmann , Claudio Fontana Subject: [PATCH v5] limit physical address space size Date: Tue, 7 Nov 2023 14:03:09 +0100 Message-ID: <20231107130309.3257776-1-kraxel@redhat.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-Scanned-By: MIMEDefang 3.4.1 on 10.11.54.10 Received-SPF: pass (zohomail.com: domain of gnu.org designates 209.51.188.17 as permitted sender) client-ip=209.51.188.17; envelope-from=qemu-devel-bounces+importer2=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.129.124; envelope-from=kraxel@redhat.com; helo=us-smtp-delivery-124.mimecast.com X-Spam_score_int: -20 X-Spam_score: -2.1 X-Spam_bar: -- X-Spam_report: (-2.1 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001, T_SCC_BODY_TEXT_LINE=-0.01 autolearn=ham autolearn_force=no X-Spam_action: no action X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.29 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+importer2=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer2=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1699362271841100003 Content-Type: text/plain; charset="utf-8" For better compatibility with old linux kernels, see source code comment. Related (same problem in ovmf): https://github.com/tianocore/edk2/commit/c1e853769046 Cc: Claudio Fontana Signed-off-by: Gerd Hoffmann Reported-by: Claudio Fontana --- src/fw/paravirt.c | 8 ++++++++ 1 file changed, 8 insertions(+) diff --git a/src/fw/paravirt.c b/src/fw/paravirt.c index e5d4eca0cb5a..a2c9c64d5e78 100644 --- a/src/fw/paravirt.c +++ b/src/fw/paravirt.c @@ -182,6 +182,14 @@ static void physbits(int qemu_quirk) __func__, signature, pae ? "yes" : "no", CPULongMode ? "yes" := "no", physbits, valid ? "yes" : "no"); =20 + if (valid && physbits > 46) { + // Old linux kernels have trouble dealing with more than 46 + // phys-bits, so avoid that for now. Seems to be a bug in the + // virtio-pci driver. Reported: centos-7, ubuntu-18.04 + dprintf(1, "%s: using phys-bits=3D46 (old linux kernel compatibili= ty)\n", __func__); + physbits =3D 46; + } + if (valid) CPUPhysBits =3D physbits; } --=20 2.41.0