From mboxrd@z Thu Jan 1 00:00:00 1970 Received: from linux.microsoft.com (linux.microsoft.com [13.77.154.182]) by smtp.subspace.kernel.org (Postfix) with ESMTP id C98B237F735 for ; Fri, 17 Apr 2026 10:58:00 +0000 (UTC) Authentication-Results: smtp.subspace.kernel.org; arc=none smtp.client-ip=13.77.154.182 ARC-Seal:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776423481; cv=none; b=mVBdPB0Lgo15OkB31RbAdfeMtGYh7C8P1x+FiJVFB28fQlMjT3GW2xk0NhBdpV5UFoZPHPz/F5dP9ARp/14ZviXLVfidTTPnbUqX3NcO5Wn1cXSZeRDMNaVnZmygS48jcXR7DSuybHvQtfED36lf16Sk9eevEQvt1vasQ6j6I+M= ARC-Message-Signature:i=1; a=rsa-sha256; d=subspace.kernel.org; s=arc-20240116; t=1776423481; c=relaxed/simple; bh=YIYJz4uQV8Uzvv7mqWNjei+7jct6XwQmJ3XYupgIEy8=; h=From:To:Cc:Subject:Date:Message-Id:In-Reply-To:References: MIME-Version; b=nHyrdIGeOCYEpizDPF+jMcAEwBXZfGJ1WF9z6jhYAQsRUfpMLgh1WzIRMuaAhMXtb0d2HVkl4UcD+WbYzrfmYLbRneXbI67OgWLVxvQomA3B1qU0i4kKMVFdHLtCUm4g9gCfYk7jal1GswYGqtT4ljjNuLdfeXi4ZAdR3/UX+Zs= ARC-Authentication-Results:i=1; smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com; spf=pass smtp.mailfrom=linux.microsoft.com; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b=ICTUaaaS; arc=none smtp.client-ip=13.77.154.182 Authentication-Results: smtp.subspace.kernel.org; dmarc=pass (p=none dis=none) header.from=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; spf=pass smtp.mailfrom=linux.microsoft.com Authentication-Results: smtp.subspace.kernel.org; dkim=pass (1024-bit key) header.d=linux.microsoft.com header.i=@linux.microsoft.com header.b="ICTUaaaS" Received: from DESKTOP-TUU1E5L.fritz.box (p5086d620.dip0.t-ipconnect.de [80.134.214.32]) by linux.microsoft.com (Postfix) with ESMTPSA id 8F9D120B7001; Fri, 17 Apr 2026 03:57:57 -0700 (PDT) DKIM-Filter: OpenDKIM Filter v2.11.0 linux.microsoft.com 8F9D120B7001 DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=linux.microsoft.com; s=default; t=1776423480; bh=Xw/caTrzhER4UZh+Hl5RTibaD3S7XoFJ/++MpcgizJQ=; h=From:To:Cc:Subject:Date:In-Reply-To:References:From; b=ICTUaaaSyGCPk0ZEfXl99cReLGE4GDPBP1BeA9SKYA/f3ocStA5vqjEvLVVi+ZwqF Pss/ONFs/3Ge+KrNdBZu1fJj3QmRWpdJFeXqC2vesGGcaaHDpa3aljSY35PK/cLqKs 5GiNol8HCRn65C0xx2qoC1iIEMQhAepx/rhI+ly8= From: Magnus Kulke To: qemu-devel@nongnu.org Cc: kvm@vger.kernel.org, Magnus Kulke , Wei Liu , "Michael S. Tsirkin" , =?UTF-8?q?C=C3=A9dric=20Le=20Goater?= , Zhao Liu , Richard Henderson , Paolo Bonzini , Wei Liu , Magnus Kulke , Alex Williamson , Marcel Apfelbaum , =?UTF-8?q?Philippe=20Mathieu-Daud=C3=A9?= , Marcelo Tosatti Subject: [PATCH 26/34] accel/mshv: introduce SaveVMHandler Date: Fri, 17 Apr 2026 12:56:10 +0200 Message-Id: <20260417105618.3621-27-magnuskulke@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260417105618.3621-1-magnuskulke@linux.microsoft.com> References: <20260417105618.3621-1-magnuskulke@linux.microsoft.com> Precedence: bulk X-Mailing-List: kvm@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 Content-Transfer-Encoding: 8bit This mechanism is used to handle more imperative partition-wide steps that have to be taken as part of a migration routine. Currently it's a skeleton that will just pause/resume the partition as part of a migration. It will later be extended with more specific steps like reference time and hypercall pages. Signed-off-by: Magnus Kulke --- accel/mshv/mshv-all.c | 75 +++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 75 insertions(+) diff --git a/accel/mshv/mshv-all.c b/accel/mshv/mshv-all.c index 4c1a42d002..5f81881c05 100644 --- a/accel/mshv/mshv-all.c +++ b/accel/mshv/mshv-all.c @@ -39,6 +39,8 @@ #include "system/mshv.h" #include "system/mshv_int.h" #include "system/reset.h" +#include "migration/qemu-file-types.h" +#include "migration/register.h" #include "trace.h" #include #include @@ -47,6 +49,9 @@ bool mshv_allowed; MshvState *mshv_state; +static int pause_vm(int vm_fd); +static int resume_vm(int vm_fd); + static int init_mshv(int *mshv_fd) { int fd = open("/dev/mshv", O_RDWR | O_CLOEXEC); @@ -80,6 +85,64 @@ static int set_time_freeze(int vm_fd, int freeze) return 0; } +static void mshv_save_state(QEMUFile *f, void *opaque) +{ + return; +} + +static int mshv_load_state(QEMUFile *f, void *opaque, int version_id) +{ + return 0; +} + +static int mshv_save_prepare(void *opaque, Error **errp) +{ + MshvState *s = opaque; + int ret; + + ret = pause_vm(s->vm); + if (ret < 0) { + error_setg(errp, "Failed to pause VM for migration"); + return -1; + } + + return 0; +} + +static void mshv_save_cleanup(void *opaque) +{ + MshvState *s = opaque; + int ret; + + ret = resume_vm(s->vm); + if (ret < 0) { + error_report("Failed to resme VM after migration"); + } +} + +static int mshv_load_setup(QEMUFile *f, void *opaque, Error **errp) +{ + MshvState *s = opaque; + int ret; + + ret = pause_vm(s->vm); + if (ret < 0) { + error_setg(errp, "Failed to pause VM for migration restore"); + return -1; + } + + return 0; +} + +static int mshv_load_cleanup(void *opaque) +{ + MshvState *s = opaque; + + resume_vm(s->vm); + + return 0; +} + static int pause_vm(int vm_fd) { int ret; @@ -454,6 +517,15 @@ static int mshv_init_vcpu(CPUState *cpu) return 0; } +static SaveVMHandlers savevm_mshv = { + .save_prepare = mshv_save_prepare, + .save_state = mshv_save_state, + .save_cleanup = mshv_save_cleanup, + .load_setup = mshv_load_setup, + .load_state = mshv_load_state, + .load_cleanup = mshv_load_cleanup, +}; + static int mshv_init(AccelState *as, MachineState *ms) { MshvState *s; @@ -509,6 +581,9 @@ static int mshv_init(AccelState *as, MachineState *ms) 0, "mshv-memory"); memory_listener_register(&mshv_io_listener, &address_space_io); + /* register custom handlers for migration events */ + register_savevm_live("mshv", 0, 1, &savevm_mshv, s); + return 0; } -- 2.34.1