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Iglesias" To: qemu-devel@nongnu.org Cc: sstabellini@kernel.org, anthony@xenproject.org, paul@xen.org, peter.maydell@linaro.org, alex.bennee@linaro.org, xenia.ragiadakou@amd.com, jason.andryuk@amd.com, edgar.iglesias@amd.com, xen-devel@lists.xenproject.org, qemu-arm@nongnu.org Subject: [PATCH v2 04/12] hw/arm: xenpvh: Add support for SMP guests Date: Tue, 20 Aug 2024 16:29:41 +0200 Message-ID: <20240820142949.533381-5-edgar.iglesias@gmail.com> X-Mailer: git-send-email 2.43.0 In-Reply-To: <20240820142949.533381-1-edgar.iglesias@gmail.com> References: <20240820142949.533381-1-edgar.iglesias@gmail.com> MIME-Version: 1.0 Content-Transfer-Encoding: quoted-printable X-ZohoMail-DKIM: pass (identity @gmail.com) X-ZM-MESSAGEID: 1724164226608116600 Content-Type: text/plain; charset="utf-8" From: "Edgar E. Iglesias" Add SMP support for Xen PVH ARM guests. Create ms->smp.max_cpus ioreq servers to handle hotplug. Note that ms->smp.max_cpus will be passed to us by the user (Xen tools) set to the guests maxvcpus. The value in mc->max_cpus is an absolute maximum for the -smp option and won't be used to setup ioreq servers unless the user explicitly specifies it with -smp. If the user doesn't pass -smp on the command-line, smp.cpus and smp.max_cpus will default to 1. Signed-off-by: Edgar E. Iglesias Reviewed-by: Stefano Stabellini --- hw/arm/xen_arm.c | 23 +++++++++++++++++++++-- 1 file changed, 21 insertions(+), 2 deletions(-) diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c index 5f75cc3779..fda65d0d8d 100644 --- a/hw/arm/xen_arm.c +++ b/hw/arm/xen_arm.c @@ -173,7 +173,7 @@ static void xen_arm_init(MachineState *machine) =20 xen_init_ram(machine); =20 - xen_register_ioreq(xam->state, machine->smp.cpus, &xen_memory_listener= ); + xen_register_ioreq(xam->state, machine->smp.max_cpus, &xen_memory_list= ener); =20 xen_create_virtio_mmio_devices(xam); =20 @@ -218,7 +218,26 @@ static void xen_arm_machine_class_init(ObjectClass *oc= , void *data) MachineClass *mc =3D MACHINE_CLASS(oc); mc->desc =3D "Xen PVH ARM machine"; mc->init =3D xen_arm_init; - mc->max_cpus =3D 1; + + /* + * mc->max_cpus holds the MAX value allowed in the -smp command-line o= pts. + * + * 1. If users don't pass any -smp option: + * ms->smp.cpus will default to 1. + * ms->smp.max_cpus will default to 1. + * + * 2. If users pass -smp X: + * ms->smp.cpus will be set to X. + * ms->smp.max_cpus will also be set to X. + * + * 3. If users pass -smp X,maxcpus=3DY: + * ms->smp.cpus will be set to X. + * ms->smp.max_cpus will be set to Y. + * + * In scenarios 2 and 3, if X or Y are set to something larger than + * mc->max_cpus, QEMU will bail out with an error message. + */ + mc->max_cpus =3D GUEST_MAX_VCPUS; mc->default_machine_opts =3D "accel=3Dxen"; /* Set explicitly here to make sure that real ram_size is passed */ mc->default_ram_size =3D 0; --=20 2.43.0