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Tsirkin" Subject: [RFC 24/32] accel/mshv: introduce SaveVMHandler Date: Mon, 23 Mar 2026 14:58:04 +0100 Message-Id: <20260323135812.383509-25-magnuskulke@linux.microsoft.com> X-Mailer: git-send-email 2.34.1 In-Reply-To: <20260323135812.383509-1-magnuskulke@linux.microsoft.com> References: <20260323135812.383509-1-magnuskulke@linux.microsoft.com> 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=13.77.154.182; envelope-from=magnuskulke@linux.microsoft.com; helo=linux.microsoft.com X-Spam_score_int: -42 X-Spam_score: -4.3 X-Spam_bar: ---- X-Spam_report: (-4.3 / 5.0 requ) BAYES_00=-1.9, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, RCVD_IN_DNSWL_MED=-2.3, RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001, 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 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 @linux.microsoft.com) X-ZM-MESSAGEID: 1774274584270158500 Content-Type: text/plain; charset="utf-8" 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 d1bf148bb8..365288b901 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; =20 MshvState *mshv_state; =20 +static int pause_vm(int vm_fd); +static int resume_vm(int vm_fd); + static int init_mshv(int *mshv_fd) { int fd =3D open("/dev/mshv", O_RDWR | O_CLOEXEC); @@ -80,6 +85,64 @@ static int set_time_freeze(int vm_fd, int freeze) return 0; } =20 +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 =3D opaque; + int ret; + + ret =3D 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 =3D opaque; + int ret; + + ret =3D 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 =3D opaque; + int ret; + + ret =3D 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 =3D 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; } =20 +static SaveVMHandlers savevm_mshv =3D { + .save_prepare =3D mshv_save_prepare, + .save_state =3D mshv_save_state, + .save_cleanup =3D mshv_save_cleanup, + .load_setup =3D mshv_load_setup, + .load_state =3D mshv_load_state, + .load_cleanup =3D 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); =20 + /* register custom handlers for migration events */ + register_savevm_live("mshv", 0, 1, &savevm_mshv, s); + return 0; } =20 --=20 2.34.1