From mboxrd@z Thu Jan 1 00:00:00 1970 Return-Path: X-Spam-Checker-Version: SpamAssassin 3.4.0 (2014-02-07) on aws-us-west-2-korg-lkml-1.web.codeaurora.org Received: from lists.gnu.org (lists.gnu.org [209.51.188.17]) (using TLSv1.2 with cipher ECDHE-RSA-AES256-GCM-SHA384 (256/256 bits)) (No client certificate requested) by smtp.lore.kernel.org (Postfix) with ESMTPS id D4C5BC83F14 for ; Thu, 31 Aug 2023 01:21:56 +0000 (UTC) Received: from localhost ([::1] helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1qbWN8-0003uV-RH; Wed, 30 Aug 2023 21:21:22 -0400 Received: from eggs.gnu.org ([2001:470:142:3::10]) by lists.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qbWN7-0003tp-Tr for qemu-devel@nongnu.org; Wed, 30 Aug 2023 21:21:21 -0400 Received: from sin.source.kernel.org ([145.40.73.55]) by eggs.gnu.org with esmtps (TLS1.2:ECDHE_RSA_AES_256_GCM_SHA384:256) (Exim 4.90_1) (envelope-from ) id 1qbWN5-0005IV-0y for qemu-devel@nongnu.org; Wed, 30 Aug 2023 21:21:21 -0400 Received: from smtp.kernel.org (relay.kernel.org [52.25.139.140]) (using TLSv1.3 with cipher TLS_AES_256_GCM_SHA384 (256/256 bits) key-exchange X25519 server-signature RSA-PSS (2048 bits) server-digest SHA256) (No client certificate requested) by sin.source.kernel.org (Postfix) with ESMTPS id D993FCE1F52; Thu, 31 Aug 2023 01:21:14 +0000 (UTC) Received: by smtp.kernel.org (Postfix) with ESMTPSA id 7384BC433C8; Thu, 31 Aug 2023 01:21:12 +0000 (UTC) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/simple; d=kernel.org; s=k20201202; t=1693444873; bh=1W2dwato+cMipbrf3KqufgJM8ww8MZMwe8GfsrLCKkY=; h=Date:From:To:cc:Subject:In-Reply-To:References:From; b=UjuseZSmw7KegvK3hxh+2dinBDZYR/C1PBblWB3pICy25yWK4ZqyT7yJfGV5EEQce /Lj54W7HOYgNRdGQzm87qyezMuApxDVyUHLje09KWg30zDyeGPWmLd3soKxUrqvOEs r5yMZ+AxqatAaRQX1ZdYH6ghT/H/K1ASoL4iRsxIYkIog+oaFLsD//45CBwamP//2+ LkI+U7OQ2Dxhj3In6S8vWrDL6aovwlJy34QUv54AMegsNOZ95oq+uywQatGg/9qI6d Nb7CetZGtP2q3G6+vzGnXUrbGpHYg1vTKfTTkwXksX2Ewu41aSB18MSM2tSvfRNLsD yO9W91t/NtUIA== Date: Wed, 30 Aug 2023 18:21:10 -0700 (PDT) From: Stefano Stabellini X-X-Sender: sstabellini@ubuntu-linux-20-04-desktop To: Vikram Garhwal cc: qemu-devel@nongnu.org, sstabellini@kernel.org, Oleksandr Tyshchenko Subject: Re: [QEMU][PATCH v4 2/2] xen_arm: Initialize RAM and add hi/low memory regions In-Reply-To: <20230830043518.21584-3-vikram.garhwal@amd.com> Message-ID: References: <20230830043518.21584-1-vikram.garhwal@amd.com> <20230830043518.21584-3-vikram.garhwal@amd.com> User-Agent: Alpine 2.22 (DEB 394 2020-01-19) MIME-Version: 1.0 Content-Type: text/plain; charset=US-ASCII Received-SPF: pass client-ip=145.40.73.55; envelope-from=sstabellini@kernel.org; helo=sin.source.kernel.org X-Spam_score_int: -43 X-Spam_score: -4.4 X-Spam_bar: ---- X-Spam_report: (-4.4 / 5.0 requ) BAYES_00=-1.9, DKIMWL_WL_HIGH=-0.001, DKIM_SIGNED=0.1, DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1, RCVD_IN_DNSWL_MED=-2.3, SPF_HELO_NONE=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: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org Sender: qemu-devel-bounces+qemu-devel=archiver.kernel.org@nongnu.org On Tue, 29 Aug 2023, Vikram Garhwal wrote: > From: Oleksandr Tyshchenko > > 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 > Signed-off-by: Vikram Garhwal Reviewed-by: Stefano Stabellini > --- > 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 */ > -- > 2.17.1 >