{"id":2230476,"url":"http://patchwork.ozlabs.org/api/1.1/patches/2230476/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429190532.26538-13-mohamed@unpredictable.fr/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/1.1/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":""},"msgid":"<20260429190532.26538-13-mohamed@unpredictable.fr>","date":"2026-04-29T19:05:29","name":"[v21,12/15] hvf: arm: disable SME when nested virt is active","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"93b0115678cb9d63315caea31005d6507dbe3e8b","submitter":{"id":91318,"url":"http://patchwork.ozlabs.org/api/1.1/people/91318/?format=json","name":"Mohamed Mediouni","email":"mohamed@unpredictable.fr"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260429190532.26538-13-mohamed@unpredictable.fr/mbox/","series":[{"id":502138,"url":"http://patchwork.ozlabs.org/api/1.1/series/502138/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502138","date":"2026-04-29T19:05:29","name":"HVF: Add support for platform vGIC and nested virtualisation","version":21,"mbox":"http://patchwork.ozlabs.org/series/502138/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2230476/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2230476/checks/","tags":{},"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=unpredictable.fr header.i=@unpredictable.fr\n header.a=rsa-sha256 header.s=sig1 header.b=fBM9tdIt;\n\tdkim-atps=neutral","legolas.ozlabs.org;\n spf=pass (sender SPF authorized) smtp.mailfrom=nongnu.org\n (client-ip=209.51.188.17; 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helo=outbound.ms.icloud.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, DKIM_SIGNED=0.1,\n DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n SPF_HELO_PASS=-0.001,\n 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":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"Currently, Apple doesn't support the nested virtualisation + SME combination.\n\nSigned-off-by: Mohamed Mediouni \nReviewed-by: Philippe Mathieu-Daudé \n---\n target/arm/hvf/hvf.c | 5 +++++\n target/arm/hvf_arm.h | 5 +++++\n 2 files changed, 10 insertions(+)","diff":"diff --git a/target/arm/hvf/hvf.c b/target/arm/hvf/hvf.c\nindex ceeb61fbc0..51b37b3331 100644\n--- a/target/arm/hvf/hvf.c\n+++ b/target/arm/hvf/hvf.c\n@@ -1206,6 +1206,11 @@ static bool hvf_arm_get_host_cpu_features(ARMHostCPUFeatures *ahcf)\n FIELD_DP64_IDREG(&host_isar, ID_AA64DFR0, PMUVER, 0x1);\n }\n \n+ if (hvf_nested_virt_enabled()) {\n+ /* SME is not implemented with nested virt on the Apple side */\n+ FIELD_DP64_IDREG(&host_isar, ID_AA64PFR1, SME, 0);\n+ }\n+\n ahcf->isar = host_isar;\n \n /*\ndiff --git a/target/arm/hvf_arm.h b/target/arm/hvf_arm.h\nindex 8029d48caf..59e19f6e84 100644\n--- a/target/arm/hvf_arm.h\n+++ b/target/arm/hvf_arm.h\n@@ -11,6 +11,7 @@\n #ifndef QEMU_HVF_ARM_H\n #define QEMU_HVF_ARM_H\n \n+#include \"system/hvf.h\"\n #include \"target/arm/cpu-qom.h\"\n \n /**\n@@ -35,6 +36,10 @@ void hvf_arm_set_cpu_features_from_host(ARMCPU *cpu);\n if (__builtin_available(macOS 15.2, *)) {\n size_t svl_bytes;\n hv_return_t result = hv_sme_config_get_max_svl_bytes(&svl_bytes);\n+ /* Nested virt not supported together with SME right now. */\n+ if (hvf_nested_virt_enabled()) {\n+ return false;\n+ }\n if (result == HV_UNSUPPORTED) {\n return false;\n }\n","prefixes":["v21","12/15"]}