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GET /api/patches/2231441/?format=api
{ "id": 2231441, "url": "http://patchwork.ozlabs.org/api/patches/2231441/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430172204.1006673-58-pbonzini@redhat.com/", "project": { "id": 14, "url": "http://patchwork.ozlabs.org/api/projects/14/?format=api", "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": "", "list_archive_url": "", "list_archive_url_format": "", "commit_url_format": "" }, "msgid": "<20260430172204.1006673-58-pbonzini@redhat.com>", "list_archive_url": null, "date": "2026-04-30T17:22:03", "name": "[PULL,57/58] whpx: i386: add SeparateSecurityDomain flag and make default", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "9af8b8eb8e38af3ff047eaedbe9ced1a89662584", "submitter": { "id": 2701, "url": "http://patchwork.ozlabs.org/api/people/2701/?format=api", "name": "Paolo Bonzini", "email": "pbonzini@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260430172204.1006673-58-pbonzini@redhat.com/mbox/", "series": [ { "id": 502347, "url": "http://patchwork.ozlabs.org/api/series/502347/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=502347", "date": "2026-04-30T17:21:16", "name": "[PULL,01/58] pythondeps: bump to meson 1.11.1", "version": 1, "mbox": "http://patchwork.ozlabs.org/series/502347/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2231441/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2231441/checks/", "tags": {}, "related": [], "headers": { "Return-Path": "<qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org>", "X-Original-To": "incoming@patchwork.ozlabs.org", "Delivered-To": "patchwork-incoming@legolas.ozlabs.org", "Authentication-Results": [ "legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) 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"<20260430172204.1006673-1-pbonzini@redhat.com>", "MIME-Version": "1.0", "Content-Transfer-Encoding": "8bit", "Received-SPF": "pass client-ip=170.10.129.124;\n envelope-from=pbonzini@redhat.com;\n 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,\n DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H4=0.001, RCVD_IN_MSPIKE_WL=0.001,\n SPF_HELO_PASS=-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": "qemu development <qemu-devel.nongnu.org>", "List-Unsubscribe": "<https://lists.nongnu.org/mailman/options/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=unsubscribe>", "List-Archive": "<https://lists.nongnu.org/archive/html/qemu-devel>", "List-Post": "<mailto:qemu-devel@nongnu.org>", "List-Help": "<mailto:qemu-devel-request@nongnu.org?subject=help>", "List-Subscribe": "<https://lists.nongnu.org/mailman/listinfo/qemu-devel>,\n <mailto:qemu-devel-request@nongnu.org?subject=subscribe>", "Errors-To": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org", "Sender": "qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org" }, "content": "From: Mohamed Mediouni <mohamed@unpredictable.fr>\n\nFor workloads where isolation is less important, -accel whpx,ssd=off\nwill provide significantly higher MMIO performance.\n\nSigned-off-by: Mohamed Mediouni <mohamed@unpredictable.fr>\nLink: https://lore.kernel.org/r/20260422214225.2242-37-mohamed@unpredictable.fr\nSigned-off-by: Paolo Bonzini <pbonzini@redhat.com>\n---\n include/system/whpx-internal.h | 2 ++\n accel/whpx/whpx-common.c | 1 +\n target/i386/whpx/whpx-all.c | 64 ++++++++++++++++++++++++++++++++++\n 3 files changed, 67 insertions(+)", "diff": "diff --git a/include/system/whpx-internal.h b/include/system/whpx-internal.h\nindex 15027a7d524..c295c5a5290 100644\n--- a/include/system/whpx-internal.h\n+++ b/include/system/whpx-internal.h\n@@ -47,6 +47,8 @@ struct whpx_state {\n bool hyperv_enlightenments_required;\n bool hyperv_enlightenments_enabled;\n \n+ bool separate_security_domain;\n+\n bool ignore_unknown_msr;\n bool intercept_msr_gp;\n };\ndiff --git a/accel/whpx/whpx-common.c b/accel/whpx/whpx-common.c\nindex d846e08714b..247e12db812 100644\n--- a/accel/whpx/whpx-common.c\n+++ b/accel/whpx/whpx-common.c\n@@ -556,6 +556,7 @@ static void whpx_accel_instance_init(Object *obj)\n whpx->hyperv_enlightenments_enabled = false;\n whpx->ignore_unknown_msr = true;\n whpx->intercept_msr_gp = false;\n+ whpx->separate_security_domain = true;\n }\n \n static const TypeInfo whpx_accel_type = {\ndiff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex d6bc36686c2..9d0c391e36f 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -2962,6 +2962,39 @@ static void whpx_set_intercept_msr_gp(Object *obj, Visitor *v,\n }\n }\n \n+static void whpx_set_ssd(Object *obj, Visitor *v,\n+ const char *name, void *opaque,\n+ Error **errp)\n+{\n+ struct whpx_state *whpx = &whpx_global;\n+ OnOffAuto mode;\n+\n+ if (!visit_type_OnOffAuto(v, name, &mode, errp)) {\n+ return;\n+ }\n+\n+ switch (mode) {\n+ case ON_OFF_AUTO_ON:\n+ whpx->separate_security_domain = true;\n+ break;\n+\n+ case ON_OFF_AUTO_OFF:\n+ whpx->separate_security_domain = false;\n+ break;\n+\n+ case ON_OFF_AUTO_AUTO:\n+ whpx->separate_security_domain = true;\n+ break;\n+ default:\n+ /*\n+ * The value was checked in visit_type_OnOffAuto() above. If\n+ * we get here, then something is wrong in QEMU.\n+ */\n+ abort();\n+ }\n+}\n+\n+\n void whpx_arch_accel_class_init(ObjectClass *oc)\n {\n object_class_property_add(oc, \"ignore-unknown-msr\", \"OnOffAuto\",\n@@ -2974,6 +3007,11 @@ void whpx_arch_accel_class_init(ObjectClass *oc)\n NULL, NULL);\n object_class_property_set_description(oc, \"intercept-msr-gp\",\n \"Intercept #GP to log erroring MSR accesses.\");\n+ object_class_property_add(oc, \"ssd\", \"OnOffAuto\",\n+ NULL, whpx_set_ssd,\n+ NULL, NULL);\n+ object_class_property_set_description(oc, \"ssd\",\n+ \"Separate security domain\");\n }\n \n int whpx_accel_init(AccelState *as, MachineState *ms)\n@@ -3169,6 +3207,32 @@ int whpx_accel_init(AccelState *as, MachineState *ms)\n }\n }\n \n+ /*\n+ * The combination of separate security domain off\n+ * and disabling specifically these features results\n+ * in a significant vmexit performance improvement\n+ * by skipping speculative execution mitigations.\n+ */\n+ if (!whpx->separate_security_domain) {\n+ processor_features.Bank0.IbrsSupport = 0;\n+ processor_features.Bank0.StibpSupport = 0;\n+ processor_features.Bank0.IbpbSupport = 0;\n+ processor_features.Bank0.SsbdSupport = 0;\n+ processor_features.Bank0.IbrsAllSupport = 0;\n+ processor_features.Bank1.PsfdSupport = 0;\n+ memset(&prop, 0, sizeof(WHV_PARTITION_PROPERTY));\n+ prop.SeparateSecurityDomain = 0;\n+ hr = whp_dispatch.WHvSetPartitionProperty(\n+ whpx->partition,\n+ WHvPartitionPropertyCodeSeparateSecurityDomain,\n+ &prop,\n+ sizeof(WHV_PARTITION_PROPERTY));\n+ if (FAILED(hr)) {\n+ error_report(\"WHPX: failed to unset separate security domain, hr=%08lx\", hr);\n+ /* Some old Windows 10 releases didn't have this, so not fatal*/\n+ }\n+ }\n+\n hr = whp_dispatch.WHvSetPartitionProperty(\n whpx->partition,\n WHvPartitionPropertyCodeProcessorFeaturesBanks,\n", "prefixes": [ "PULL", "57/58" ] }