On Thu, 29 Jun 2023, Vikram Garhwal wrote: > From: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com> > > In order to use virtio backends we need to initialize RAM for the > xen-mapcache (which is responsible for mapping guest memory using foreign > mapping) to work. Calculate and add hi/low memory regions based on > machine->ram_size. > > Use the constants defined in public header arch-arm.h to be aligned with the > xen > toolstack. > > While using this machine, the toolstack should then pass real ram_size using > "-m" arg. If "-m" is not given, create a QEMU machine without IOREQ, TPM and > VIRTIO to keep it usable for /etc/init.d/xencommons. > > Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshche...@epam.com> > Signed-off-by: Vikram Garhwal <vikram.garh...@amd.com> > --- > hw/arm/xen_arm.c | 45 +++++++++++++++++++++++++++++++++++++++++++++ > 1 file changed, 45 insertions(+) > > diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c > index c0a93f2c9d..cc4dffee70 100644 > --- a/hw/arm/xen_arm.c > +++ b/hw/arm/xen_arm.c > @@ -60,6 +60,8 @@ struct XenArmState { > } cfg; > }; > > +static MemoryRegion ram_lo, ram_hi; > + > #define VIRTIO_MMIO_DEV_SIZE 0x200 > > #define NR_VIRTIO_MMIO_DEVICES \ > @@ -86,6 +88,39 @@ static void xen_create_virtio_mmio_devices(XenArmState > *xam) > } > } > > +static void xen_init_ram(MachineState *machine) > +{ > + MemoryRegion *sysmem = get_system_memory(); > + ram_addr_t block_len, ram_size[GUEST_RAM_BANKS]; > + > + if (machine->ram_size <= GUEST_RAM0_SIZE) { > + ram_size[0] = machine->ram_size; > + ram_size[1] = 0; > + block_len = GUEST_RAM0_BASE + ram_size[0]; > + } else { > + ram_size[0] = GUEST_RAM0_SIZE; > + ram_size[1] = machine->ram_size - GUEST_RAM0_SIZE; > + block_len = GUEST_RAM1_BASE + ram_size[1]; > + } > + > + memory_region_init_ram(&ram_memory, NULL, "xen.ram", block_len, > + &error_fatal); > + > + memory_region_init_alias(&ram_lo, NULL, "xen.ram.lo", &ram_memory, > + GUEST_RAM0_BASE, ram_size[0]); > + memory_region_add_subregion(sysmem, GUEST_RAM0_BASE, &ram_lo); > + DPRINTF("Initialized region xen.ram.lo: base 0x%llx size 0x%lx\n", > + GUEST_RAM0_BASE, ram_size[0]); > + > + if (ram_size[1] > 0) { > + memory_region_init_alias(&ram_hi, NULL, "xen.ram.hi", &ram_memory, > + GUEST_RAM1_BASE, ram_size[1]); > + memory_region_add_subregion(sysmem, GUEST_RAM1_BASE, &ram_hi); > + DPRINTF("Initialized region xen.ram.hi: base 0x%llx size 0x%lx\n", > + GUEST_RAM1_BASE, ram_size[1]); > + } > +} > + > void arch_handle_ioreq(XenIOState *state, ioreq_t *req) > { > hw_error("Invalid ioreq type 0x%x\n", req->type); > @@ -135,6 +170,14 @@ static void xen_arm_init(MachineState *machine) > > xam->state = g_new0(XenIOState, 1); > > + if (machine->ram_size == 0) { > + DPRINTF("ram_size not specified. QEMU machine will be started > without" > + " TPM, IOREQ and Virtio-MMIO backends\n"); > + return; > + }
I would say "ram_size not specified. QEMU machine started without IOREQ (no emulated devices including Virtio)." We might add more devices in the future beyond Virtio and TPM. I don't think we want to call out the whole list here. > + xen_init_ram(machine); > + > xen_register_ioreq(xam->state, machine->smp.cpus, xen_memory_listener); > > xen_create_virtio_mmio_devices(xam); > @@ -182,6 +225,8 @@ static void xen_arm_machine_class_init(ObjectClass *oc, > void *data) > mc->init = xen_arm_init; > mc->max_cpus = 1; > mc->default_machine_opts = "accel=xen"; > + /* Set explicitly here to make sure that real ram_size is passed */ > + mc->default_ram_size = 0; > > printf("CHECK for NEW BUILD\n"); > #ifdef CONFIG_TPM > -- > 2.25.1 >