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Tue, 12 Sep 2023 05:07:37 -0700 (PDT) From: Ani Sinha To: david@redhat.com Cc: pbonzini@redhat.com, mst@redhat.com, richard.henderson@linaro.org, philmd@linaro.org, Ani Sinha , qemu-devel@nongnu.org Subject: [PATCH] cpu/cpuid: check CPUID_PAE to determine 36 bit processor address space Date: Tue, 12 Sep 2023 17:36:50 +0530 Message-Id: <20230912120650.371781-1-anisinha@redhat.com> X-Mailer: git-send-email 2.39.1 MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable 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+importer=patchew.org@nongnu.org; helo=lists.gnu.org; Received-SPF: pass client-ip=170.10.133.124; envelope-from=anisinha@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_H3=0.001, RCVD_IN_MSPIKE_WL=0.001, SPF_HELO_NONE=0.001, SPF_PASS=-0.001 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+importer=patchew.org@nongnu.org Sender: qemu-devel-bounces+importer=patchew.org@nongnu.org X-ZohoMail-DKIM: pass (identity @redhat.com) X-ZM-MESSAGEID: 1694520508690100001 Content-Type: text/plain; charset="utf-8" PAE mode in x86 supports 36 bit address space. Check the PAE CPUID on the guest processor and set phys_bits to 36 if PAE feature is set. This is in addition to checking the presence of PSE36 CPUID feature for setting 36 bit phys_bits. Signed-off-by: Ani Sinha Acked-by: Michael S. Tsirkin Reviewed-by: David Hildenbrand --- target/i386/cpu.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) Note: Not sure what tests I should be running in order to make sure I am not breaking any guest OSes. Usual qtests pass. diff --git a/target/i386/cpu.c b/target/i386/cpu.c index 24ee67b42d..f3a5c99117 100644 --- a/target/i386/cpu.c +++ b/target/i386/cpu.c @@ -7375,7 +7375,7 @@ static void x86_cpu_realizefn(DeviceState *dev, Error= **errp) return; } =20 - if (env->features[FEAT_1_EDX] & CPUID_PSE36) { + if (env->features[FEAT_1_EDX] & (CPUID_PSE36 | CPUID_PAE)) { cpu->phys_bits =3D 36; } else { cpu->phys_bits =3D 32; --=20 2.39.1