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GET /api/patches/2195828/?format=api
{ "id": 2195828, "url": "http://patchwork.ozlabs.org/api/patches/2195828/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260212062522.99565-4-anisinha@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": "<20260212062522.99565-4-anisinha@redhat.com>", "list_archive_url": null, "date": "2026-02-12T06:24:47", "name": "[v4,03/31] hw/accel: add a per-accelerator callback to change VM accelerator handle", "commit_ref": null, "pull_url": null, "state": "new", "archived": false, "hash": "540be60f683123a27b17dde4c970bc55b1cced85", "submitter": { "id": 86030, "url": "http://patchwork.ozlabs.org/api/people/86030/?format=api", "name": "Ani Sinha", "email": "anisinha@redhat.com" }, "delegate": null, "mbox": "http://patchwork.ozlabs.org/project/qemu-devel/patch/20260212062522.99565-4-anisinha@redhat.com/mbox/", "series": [ { "id": 491935, "url": "http://patchwork.ozlabs.org/api/series/491935/?format=api", "web_url": "http://patchwork.ozlabs.org/project/qemu-devel/list/?series=491935", "date": "2026-02-12T06:24:45", "name": "Introduce support for confidential guest reset (x86)", "version": 4, "mbox": "http://patchwork.ozlabs.org/series/491935/mbox/" } ], "comments": "http://patchwork.ozlabs.org/api/patches/2195828/comments/", "check": "pending", "checks": "http://patchwork.ozlabs.org/api/patches/2195828/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) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 header.b=cP9E2Q/6;\n\tdkim=pass (2048-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=google header.b=hRb+BmHc;\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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Therefore, the old accelerator guest\nfile handle must be closed and a new one created. To this end, a per-accelerator\ncallback, \"reset_vmfd\" is introduced that would get called when a confidential\nguest is reset. Subsequent patches will introduce specific implementation of\nthis callback for KVM accelerator.\n\nSigned-off-by: Ani Sinha <anisinha@redhat.com>\n---\n include/accel/accel-ops.h | 1 +\n system/runstate.c | 37 ++++++++++++++++++++++++++++++++++++-\n 2 files changed, 37 insertions(+), 1 deletion(-)", "diff": "diff --git a/include/accel/accel-ops.h b/include/accel/accel-ops.h\nindex 23a8c246e1..998a95ca69 100644\n--- a/include/accel/accel-ops.h\n+++ b/include/accel/accel-ops.h\n@@ -23,6 +23,7 @@ struct AccelClass {\n AccelOpsClass *ops;\n \n int (*init_machine)(AccelState *as, MachineState *ms);\n+ int (*reset_vmfd)(MachineState *ms);\n bool (*cpu_common_realize)(CPUState *cpu, Error **errp);\n void (*cpu_common_unrealize)(CPUState *cpu);\n /* get_stats: Append statistics to @buf */\ndiff --git a/system/runstate.c b/system/runstate.c\nindex 5d58260ed5..0a74e3ade5 100644\n--- a/system/runstate.c\n+++ b/system/runstate.c\n@@ -42,6 +42,7 @@\n #include \"qapi/qapi-commands-run-state.h\"\n #include \"qapi/qapi-events-run-state.h\"\n #include \"qemu/accel.h\"\n+#include \"accel/accel-ops.h\"\n #include \"qemu/error-report.h\"\n #include \"qemu/job.h\"\n #include \"qemu/log.h\"\n@@ -509,6 +510,9 @@ void qemu_system_reset(ShutdownCause reason)\n {\n MachineClass *mc;\n ResetType type;\n+ AccelClass *ac = ACCEL_GET_CLASS(current_accel());\n+ bool vmfd_reset = false;\n+ int ret;\n \n mc = current_machine ? MACHINE_GET_CLASS(current_machine) : NULL;\n \n@@ -521,6 +525,29 @@ void qemu_system_reset(ShutdownCause reason)\n default:\n type = RESET_TYPE_COLD;\n }\n+\n+ /*\n+ * different accelerators implement how to close the old file handle of\n+ * the accelerator descriptor and create a new one here. Resetting\n+ * file handle is necessary to create a new confidential VM context post\n+ * VM reset.\n+ */\n+ if (!cpus_are_resettable() &&\n+ (reason == SHUTDOWN_CAUSE_GUEST_RESET ||\n+ reason == SHUTDOWN_CAUSE_HOST_QMP_SYSTEM_RESET)) {\n+ if (ac->reset_vmfd) {\n+ ret = ac->reset_vmfd(current_machine);\n+ if (ret < 0) {\n+ error_report(\"unable to reset vmfd: %s(%d)\",\n+ strerror(-ret), ret);\n+ vm_stop(RUN_STATE_INTERNAL_ERROR);\n+ }\n+ vmfd_reset = true;\n+ } else {\n+ error_report(\"accelerator does not support reset\");\n+ }\n+ }\n+\n if (mc && mc->reset) {\n mc->reset(current_machine, type);\n } else {\n@@ -543,7 +570,15 @@ void qemu_system_reset(ShutdownCause reason)\n * it does _more_ than cpu_synchronize_all_post_reset().\n */\n if (cpus_are_resettable()) {\n- cpu_synchronize_all_post_reset();\n+ if (vmfd_reset) {\n+ /*\n+ * If vmfd has changed, then vcpufds have also changed.\n+ * Need to sync full cpu state for non confidential guests.\n+ */\n+ cpu_synchronize_all_post_init();\n+ } else {\n+ cpu_synchronize_all_post_reset();\n+ }\n }\n \n vm_set_suspended(false);\n", "prefixes": [ "v4", "03/31" ] }