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From 70a74795c5071bf591e6e557b7c8c492ead0e675 Mon Sep 17 00:00:00 2001
From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Date: Tue, 29 Aug 2023 21:35:18 -0700
Subject: [PATCH 02/11] xen_arm: Initialize RAM and add hi/low memory regions
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 and other
emulated devices like TPM and VIRTIO. This is done to keep this QEMU machine
usable for /etc/init.d/xencommons.
Signed-off-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Signed-off-by: Vikram Garhwal <vikram.garhwal@amd.com>
Reviewed-by: Stefano Stabellini <sstabellini@kernel.org>
Signed-off-by: Stefano Stabellini <stefano.stabellini@amd.com>
---
hw/arm/xen_arm.c | 45 +++++++++++++++++++++++++++++++++++++
include/hw/xen/xen_native.h | 8 +++++++
2 files changed, 53 insertions(+)
diff --git a/hw/arm/xen_arm.c b/hw/arm/xen_arm.c
index 7393b37355..f83b983ec5 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;
+
/*
* VIRTIO_MMIO_DEV_SIZE is imported from tools/libs/light/libxl_arm.c under Xen
* repository.
@@ -92,6 +94,39 @@ 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);
@@ -141,6 +176,14 @@ 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 started without IOREQ"
+ "(no emulated devices including Virtio)\n");
+ return;
+ }
+
+ xen_init_ram(machine);
+
xen_register_ioreq(xam->state, machine->smp.cpus, &xen_memory_listener);
xen_create_virtio_mmio_devices(xam);
@@ -188,6 +231,8 @@ 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;
#ifdef CONFIG_TPM
object_class_property_add(oc, "tpm-base-addr", "uint64_t",
diff --git a/include/hw/xen/xen_native.h b/include/hw/xen/xen_native.h
index a4b1aa9e5d..5d2718261f 100644
--- a/include/hw/xen/xen_native.h
+++ b/include/hw/xen/xen_native.h
@@ -539,4 +539,12 @@ static inline int xendevicemodel_set_irq_level(xendevicemodel_handle *dmod,
#define GUEST_VIRTIO_MMIO_SPI_LAST 43
#endif
+#if defined(__i386__) || defined(__x86_64__)
+#define GUEST_RAM_BANKS 2
+#define GUEST_RAM0_BASE 0x40000000ULL /* 3GB of low RAM @ 1GB */
+#define GUEST_RAM0_SIZE 0xc0000000ULL
+#define GUEST_RAM1_BASE 0x0200000000ULL /* 1016GB of RAM @ 8GB */
+#define GUEST_RAM1_SIZE 0xfe00000000ULL
+#endif
+
#endif /* QEMU_HW_XEN_NATIVE_H */
--
2.39.2
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