From patchwork Tue Feb 25 11:48:51 2020 Content-Type: text/plain; charset="utf-8" MIME-Version: 1.0 Content-Transfer-Encoding: 8bit X-Patchwork-Submitter: Paolo Bonzini X-Patchwork-Id: 11403325 Return-Path: Received: from mail.kernel.org (pdx-korg-mail-1.web.codeaurora.org [172.30.200.123]) by pdx-korg-patchwork-2.web.codeaurora.org (Postfix) with ESMTP id DDED5138D for ; Tue, 25 Feb 2020 11:54:23 +0000 (UTC) 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 mail.kernel.org (Postfix) with ESMTPS id A404E21556 for ; Tue, 25 Feb 2020 11:54:23 +0000 (UTC) Authentication-Results: mail.kernel.org; dkim=fail reason="signature verification failed" (2048-bit key) header.d=gmail.com header.i=@gmail.com header.b="ZnC+PsqW" DMARC-Filter: OpenDMARC Filter v1.3.2 mail.kernel.org A404E21556 Authentication-Results: mail.kernel.org; dmarc=fail (p=none dis=none) header.from=redhat.com Authentication-Results: mail.kernel.org; spf=pass smtp.mailfrom=qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Received: from localhost ([::1]:53496 helo=lists1p.gnu.org) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6Yn8-0005d2-PI for patchwork-qemu-devel@patchwork.kernel.org; Tue, 25 Feb 2020 06:54:22 -0500 Received: from eggs.gnu.org ([2001:470:142:3::10]:49017) by lists.gnu.org with esmtp (Exim 4.90_1) (envelope-from ) id 1j6Yk7-0000C1-B1 for qemu-devel@nongnu.org; Tue, 25 Feb 2020 06:51:18 -0500 Received: from Debian-exim by eggs.gnu.org with spam-scanned (Exim 4.71) (envelope-from ) id 1j6Yk2-0005HC-Ht for qemu-devel@nongnu.org; Tue, 25 Feb 2020 06:51:14 -0500 Received: from mail-wr1-x441.google.com ([2a00:1450:4864:20::441]:46412) by eggs.gnu.org with esmtps (TLS1.0:RSA_AES_128_CBC_SHA1:16) (Exim 4.71) (envelope-from ) id 1j6Yk2-0005Dx-4J for qemu-devel@nongnu.org; Tue, 25 Feb 2020 06:51:10 -0500 Received: by mail-wr1-x441.google.com with SMTP id j7so1842559wrp.13 for ; Tue, 25 Feb 2020 03:51:09 -0800 (PST) DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=20161025; h=sender:from:to:subject:date:message-id:mime-version :content-transfer-encoding; bh=e9Bm64ekAxxkyn2z9xBC7p66RaTmBC8hGAQkTqwSS0I=; b=ZnC+PsqW3su/cF/eteHBARPXad6omnLwnpoumSbX/MJIdoZYwq+99qp7MRDfhNqVDz IE9ABNVvMzvnOIpR0u4bIqAzqX20A849Adi3yTlol8FQRy00XpdAE2EDgBWhc9qZJsNL wqeItqAiBefVkS9cvQzZR7uZ9TBLDzr1WXLIX5xb43sjnPatLpWOKk9a+N038m2vgWvU lIPGyPfAkzcN1lNaryhWPwGgku7HY0cke7mq1h3/l+4yyyTeCkYCrEjaZ98rHokzNRst WOZkARYtiNVnb25Gko63BWsMMr2TXSKaqEYwcIIYa50NHWuDvbVyXYwzW/1wQ2xvdIyY lPuQ== X-Google-DKIM-Signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=1e100.net; s=20161025; h=x-gm-message-state:sender:from:to:subject:date:message-id :mime-version:content-transfer-encoding; bh=e9Bm64ekAxxkyn2z9xBC7p66RaTmBC8hGAQkTqwSS0I=; b=htOYYOFmsIpfTaUlZ6OVy/oAKXKZHGZMp0xUvHTUo7vIVBB/vCz+7txMTNEt/tf001 1SkttEqQm+rwvHGL5AwrUjMfmJ758TsHgw0kSx7Qoz+yufuWcT/dzTnqa6HSoYMYUoVD 1LELjCEgIxVMArxGfIzbgz+91HNwOIy600dIwpBGPRIzdqj4TdLrmg2LBfv3ji+E3Elj rv/3jpSzntVSPgtYN4WWpHA/pt2DPr1yc87p60HTX4VMHoQl1SoubtraeE3akC9ebZDd nh0e2gObeWumOnCp7YOvffzIUaPJvltpggLPGXyt7Vg+wRATJUCf17NqmTtXblo2LXIm N4+g== X-Gm-Message-State: APjAAAXri7eV/B9Cor4SkOFJaP3dRGZTXtx6GWNZUQxmHw98NF/erfWU 3gIJkuUQJx2exfa+9OlfLxNFLS4c X-Google-Smtp-Source: APXvYqwyDIOecxJmcPFm/UU6728CIXvc8A2UH/VFDQcMJBgbnY5bfZMDSewCEQZTBFd3Fs6CzlR5uQ== X-Received: by 2002:adf:f288:: with SMTP id k8mr76988042wro.301.1582631467990; Tue, 25 Feb 2020 03:51:07 -0800 (PST) Received: from 640k.localdomain ([93.56.166.5]) by smtp.gmail.com with ESMTPSA id b67sm3922326wmc.38.2020.02.25.03.51.07 for (version=TLS1_2 cipher=ECDHE-RSA-AES128-GCM-SHA256 bits=128/128); Tue, 25 Feb 2020 03:51:07 -0800 (PST) From: Paolo Bonzini To: qemu-devel@nongnu.org Subject: [PULL 000/136] Misc patches for 2020-02-25 (refactoring and Coccinelle edition) Date: Tue, 25 Feb 2020 12:48:51 +0100 Message-Id: <1582631466-13880-1-git-send-email-pbonzini@redhat.com> X-Mailer: git-send-email 1.8.3.1 MIME-Version: 1.0 X-detected-operating-system: by eggs.gnu.org: Genre and OS details not recognized. X-Received-From: 2a00:1450:4864:20::441 X-BeenThere: qemu-devel@nongnu.org X-Mailman-Version: 2.1.23 Precedence: list List-Id: List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: qemu-devel-bounces+patchwork-qemu-devel=patchwork.kernel.org@nongnu.org Sender: "Qemu-devel" The following changes since commit c1e667d2598b9b3ce62b8e89ed22dd38dfe9f57f: Merge remote-tracking branch 'remotes/stefanha/tags/block-pull-request' into staging (2020-02-24 11:38:54 +0000) are available in the git repository at: git://github.com/bonzini/qemu.git tags/for-upstream for you to fetch changes up to 4db373bef1544b3b5e02ed376d0788c5b6a7548b: Merge branch 'exec_rw_const_v4' of https://github.com/philmd/qemu into HEAD (2020-02-25 09:37:42 +0100) ---------------------------------------------------------------- * device_del fix (Julia) * FXAM fix (myself) * memdev refactoring (Igor) * memory region API cleanups (Peter, Philippe) * ioeventfd optimization (Stefan) * new WHPX maintainer (Sunil) * Large guest startup optimizations (Chen) ---------------------------------------------------------------- Igor Mammedov (79): numa: remove deprecated -mem-path fallback to anonymous RAM machine: introduce memory-backend property machine: alias -mem-path and -mem-prealloc into memory-foo backend machine: introduce convenience MachineState::ram initialize MachineState::ram in NUMA case vl.c: move -m parsing after memory backends has been processed vl.c: ensure that ram_size matches size of machine.memory-backend alpha/dp264: use memdev for RAM arm/aspeed: actually check RAM size arm/aspeed: use memdev for RAM arm/collie: use memdev for RAM arm/cubieboard: use memdev for RAM arm/digic_boards: use memdev for RAM arm/highbank: use memdev for RAM arm/imx25_pdk: drop RAM size fixup arm/imx25_pdk: use memdev for RAM arm/integratorcp: use memdev for RAM arm/kzm: drop RAM size fixup arm/kzm: use memdev for RAM arm/mcimx6ul-evk: use memdev for RAM arm/mcimx7d-sabre: use memdev for RAM arm/mps2-tz: use memdev for RAM arm/mps2: use memdev for RAM arm/musicpal: use memdev for RAM arm/nseries: use memdev for RAM arm/omap_sx1: use memdev for RAM arm/palm: use memdev for RAM arm/sabrelite: use memdev for RAM arm/raspi: use memdev for RAM arm/sbsa-ref: use memdev for RAM arm/versatilepb: use memdev for RAM arm/vexpress: use memdev for RAM arm/virt: use memdev for RAM arm/xilinx_zynq: drop RAM size fixup arm/xilinx_zynq: use memdev for RAM arm/xlnx-versal-virt: use memdev for RAM arm/xlnx-zcu102: use memdev for RAM s390x/s390-virtio-ccw: use memdev for RAM null-machine: use memdev for RAM cris/axis_dev88: use memdev for RAM hppa: use memdev for RAM x86/microvm: use memdev for RAM x86/pc: use memdev for RAM lm32/lm32_boards: use memdev for RAM lm32/milkymist: use memdev for RAM m68k/an5206: use memdev for RAM m68k/q800: use memdev for RAM m68k/mcf5208: use memdev for RAM m68k/next-cube: use memdev for RAM mips/boston: use memdev for RAM mips/mips_fulong2e: drop RAM size fixup mips/mips_fulong2e: use memdev for RAM mips/mips_jazz: use memdev for RAM mips/mips_jazz: add max ram size check mips/mips_malta: use memdev for RAM mips/mips_mipssim: use memdev for RAM mips/mips_r4k: use memdev for RAM ppc/e500: drop RAM size fixup ppc/e500: use memdev for RAM ppc/mac_newworld: use memdev for RAM ppc/mac_oldworld: use memdev for RAM ppc/pnv: use memdev for RAM ppc/ppc405_boards: add RAM size checks ppc/ppc405_boards: use memdev for RAM ppc/{ppc440_bamboo, sam460ex}: drop RAM size fixup ppc/{ppc440_bamboo, sam460ex}: use memdev for RAM ppc/spapr: use memdev for RAM ppc/virtex_ml507: use memdev for RAM sparc/leon3: use memdev for RAM sparc/sun4m: use memdev for RAM sparc/niagara: use memdev for RAM remove no longer used memory_region_allocate_system_memory() exec: cleanup qemu_minrampagesize()/qemu_maxrampagesize() exec: drop bogus mem_path from qemu_ram_alloc_from_fd() make mem_path local variable hostmem: introduce "prealloc-threads" property hostmem: fix strict bind policy tests/numa-test: make top level args dynamic and g_autofree(cli) cleanups tests:numa-test: use explicit memdev to specify node RAM Julia Suvorova (1): qdev-monitor: Forbid repeated device_del Paolo Bonzini (4): target/i386: check for empty register in FXAM Merge tag 'patchew/20200219160953.13771-1-imammedo@redhat.com' of https://github.com/patchew-project/qemu into HEAD Merge tag 'patchew/20200224205533.23798-1-philmd@redhat.com' of https://github.com/patchew-project/qemu into HEAD Merge branch 'exec_rw_const_v4' of https://github.com/philmd/qemu into HEAD Peter Maydell (1): Avoid address_space_rw() with a constant is_write argument Philippe Mathieu-Daudé (51): scripts/git.orderfile: Display Cocci scripts before code modifications hw: Remove unnecessary cast when calling dma_memory_read() exec: Rename ram_ptr variable exec: Let flatview API take void pointer arguments exec: Let the address_space API use void pointer arguments hw/net: Avoid casting non-const pointer, use address_space_write() Remove unnecessary cast when using the address_space API exec: Let the cpu_[physical]_memory API use void pointer arguments Remove unnecessary cast when using the cpu_[physical]_memory API hw/ide/internal: Remove unused DMARestartFunc typedef hw/ide: Let the DMAIntFunc prototype use a boolean 'is_write' argument hw/virtio: Let virtqueue_map_iovec() use a boolean 'is_write' argument hw/virtio: Let vhost_memory_map() use a boolean 'is_write' argument exec: Let address_space_unmap() use a boolean 'is_write' argument Let address_space_rw() calls pass a boolean 'is_write' argument exec: Let cpu_[physical]_memory API use a boolean 'is_write' argument Let cpu_[physical]_memory() calls pass a boolean 'is_write' argument Avoid cpu_physical_memory_rw() with a constant is_write argument memory: Correctly return alias region type memory: Simplify memory_region_init_rom_nomigrate() to ease review scripts/cocci: Rename memory-region-{init-ram -> housekeeping} scripts/cocci: Patch to replace memory_region_init_{ram, readonly -> rom} hw/arm: Use memory_region_init_rom() with read-only regions hw/display: Use memory_region_init_rom() with read-only regions hw/mips: Use memory_region_init_rom() with read-only regions hw/m68k: Use memory_region_init_rom() with read-only regions hw/net: Use memory_region_init_rom() with read-only regions hw/pci-host: Use memory_region_init_rom() with read-only regions hw/ppc: Use memory_region_init_rom() with read-only regions hw/riscv: Use memory_region_init_rom() with read-only regions hw/sh4: Use memory_region_init_rom() with read-only regions hw/sparc: Use memory_region_init_rom() with read-only regions scripts/cocci: Patch to detect potential use of memory_region_init_rom hw/arm/stm32: Use memory_region_init_rom() with read-only regions hw/ppc/ppc405: Use memory_region_init_rom() with read-only regions hw/i386/pc_sysfw: Simplify using memory_region_init_alias() hw/i386/pc_sysfw: Remove unused 'ram_size' argument scripts/cocci: Patch to remove unnecessary memory_region_set_readonly() hw/arm: Remove unnecessary memory_region_set_readonly() on ROM alias scripts/cocci: Patch to let devices own their MemoryRegions hw/arm: Let devices own the MemoryRegion they create hw/char: Let devices own the MemoryRegion they create hw/core: Let devices own the MemoryRegion they create hw/display: Let devices own the MemoryRegion they create hw/dma: Let devices own the MemoryRegion they create hw/riscv: Let devices own the MemoryRegion they create hw/input/milkymist-softusb: Remove unused 'pmem_ptr' field hw/input/milkymist-softusb: Let devices own the MemoryRegion they create hw/net/milkymist-minimac2: Let devices own the MemoryRegion they create hw/block/onenand: Let devices own the MemoryRegion they create accel/kvm: Check ioctl(KVM_SET_USER_MEMORY_REGION) return value Stefan Hajnoczi (1): memory: batch allocate ioeventfds[] in address_space_update_ioeventfds() Sunil Muthuswamy (1): WHPX: Assigning maintainer for Windows Hypervisor Platform bauerchen (1): mem-prealloc: optimize large guest startup MAINTAINERS | 9 ++ accel/kvm/kvm-all.c | 18 ++- backends/hostmem-file.c | 8 -- backends/hostmem-memfd.c | 1 - backends/hostmem-ram.c | 2 - backends/hostmem.c | 53 +++++-- dma-helpers.c | 4 +- exec.c | 131 ++++++----------- hw/alpha/alpha_sys.h | 2 +- hw/alpha/dp264.c | 3 +- hw/alpha/typhoon.c | 8 +- hw/arm/aspeed.c | 18 +-- hw/arm/boot.c | 6 +- hw/arm/collie.c | 16 ++- hw/arm/cubieboard.c | 25 ++-- hw/arm/digic_boards.c | 40 +++--- hw/arm/exynos4210.c | 14 +- hw/arm/fsl-imx25.c | 10 +- hw/arm/fsl-imx31.c | 6 +- hw/arm/fsl-imx6.c | 6 +- hw/arm/fsl-imx6ul.c | 9 +- hw/arm/highbank.c | 10 +- hw/arm/imx25_pdk.c | 19 +-- hw/arm/integratorcp.c | 9 +- hw/arm/kzm.c | 18 +-- hw/arm/mainstone.c | 3 +- hw/arm/mcimx6ul-evk.c | 25 ++-- hw/arm/mcimx7d-sabre.c | 25 ++-- hw/arm/mps2-tz.c | 15 +- hw/arm/mps2.c | 15 +- hw/arm/msf2-soc.c | 6 +- hw/arm/musicpal.c | 18 ++- hw/arm/nrf51_soc.c | 2 +- hw/arm/nseries.c | 32 +++-- hw/arm/omap_sx1.c | 26 ++-- hw/arm/palm.c | 22 ++- hw/arm/raspi.c | 10 +- hw/arm/sabrelite.c | 23 ++- hw/arm/sbsa-ref.c | 7 +- hw/arm/smmu-common.c | 3 +- hw/arm/smmuv3.c | 10 +- hw/arm/spitz.c | 3 +- hw/arm/stellaris.c | 3 +- hw/arm/stm32f205_soc.c | 11 +- hw/arm/stm32f405_soc.c | 12 +- hw/arm/tosa.c | 3 +- hw/arm/versatilepb.c | 7 +- hw/arm/vexpress.c | 14 +- hw/arm/virt.c | 7 +- hw/arm/xilinx_zynq.c | 20 ++- hw/arm/xlnx-versal-virt.c | 7 +- hw/arm/xlnx-zcu102.c | 7 +- hw/arm/xlnx-zynqmp.c | 11 +- hw/block/onenand.c | 7 +- hw/char/serial.c | 7 +- hw/core/machine.c | 48 +++++++ hw/core/null-machine.c | 8 +- hw/core/numa.c | 101 ++++--------- hw/core/platform-bus.c | 3 +- hw/cris/axis_dev88.c | 8 +- hw/display/cg3.c | 5 +- hw/display/exynos4210_fimd.c | 3 +- hw/display/g364fb.c | 3 +- hw/display/macfb.c | 4 +- hw/display/milkymist-tmu2.c | 8 +- hw/display/omap_dss.c | 2 +- hw/display/omap_lcdc.c | 10 +- hw/display/ramfb.c | 2 +- hw/display/tcx.c | 5 +- hw/dma/etraxfs_dma.c | 25 ++-- hw/dma/i8257.c | 2 +- hw/dma/rc4030.c | 14 +- hw/dma/xlnx-zdma.c | 11 +- hw/hppa/machine.c | 10 +- hw/i386/microvm.c | 12 +- hw/i386/pc.c | 19 ++- hw/i386/pc_sysfw.c | 29 ++-- hw/ide/ahci.c | 2 +- hw/ide/core.c | 2 +- hw/ide/macio.c | 2 +- hw/ide/pci.c | 2 +- hw/input/milkymist-softusb.c | 12 +- hw/lm32/lm32_boards.c | 39 +++-- hw/lm32/milkymist.c | 21 ++- hw/m68k/an5206.c | 5 +- hw/m68k/mcf5208.c | 5 +- hw/m68k/next-cube.c | 5 +- hw/m68k/q800.c | 9 +- hw/mips/boston.c | 11 +- hw/mips/mips_fulong2e.c | 18 +-- hw/mips/mips_jazz.c | 18 +-- hw/mips/mips_malta.c | 10 +- hw/mips/mips_mipssim.c | 12 +- hw/mips/mips_r4k.c | 15 +- hw/misc/aspeed_sdmc.c | 83 ++++++++--- hw/misc/pc-testdev.c | 2 +- hw/net/cadence_gem.c | 21 ++- hw/net/dp8393x.c | 75 +++++----- hw/net/i82596.c | 25 ++-- hw/net/lasi_i82596.c | 5 +- hw/net/milkymist-minimac2.c | 8 +- hw/nvram/spapr_nvram.c | 4 +- hw/pci-host/prep.c | 5 +- hw/ppc/e500.c | 17 ++- hw/ppc/e500plat.c | 1 + hw/ppc/mac_newworld.c | 9 +- hw/ppc/mac_oldworld.c | 9 +- hw/ppc/mpc8544ds.c | 1 + hw/ppc/pnv.c | 8 +- hw/ppc/pnv_lpc.c | 8 +- hw/ppc/ppc405_boards.c | 54 ++++--- hw/ppc/ppc440_bamboo.c | 12 +- hw/ppc/ppc440_uc.c | 6 +- hw/ppc/ppc4xx_devs.c | 67 +++++---- hw/ppc/sam460ex.c | 6 +- hw/ppc/spapr.c | 8 +- hw/ppc/spapr_hcall.c | 4 +- hw/ppc/virtex_ml507.c | 12 +- hw/riscv/sifive_e.c | 9 +- hw/riscv/sifive_u.c | 2 +- hw/s390x/css.c | 12 +- hw/s390x/ipl.c | 2 +- hw/s390x/s390-pci-bus.c | 2 +- hw/s390x/s390-virtio-ccw.c | 7 +- hw/s390x/virtio-ccw.c | 2 +- hw/scsi/vmw_pvscsi.c | 8 +- hw/sd/sdhci.c | 15 +- hw/sh4/shix.c | 3 +- hw/sparc/leon3.c | 9 +- hw/sparc/sun4m.c | 74 +++++----- hw/sparc64/niagara.c | 7 +- hw/virtio/vhost.c | 8 +- hw/virtio/virtio.c | 7 +- hw/xen/xen_pt_graphics.c | 2 +- include/exec/cpu-all.h | 2 +- include/exec/cpu-common.h | 12 +- include/exec/memory.h | 16 +-- include/hw/boards.h | 54 +++---- include/hw/ide/internal.h | 3 +- include/hw/misc/aspeed_sdmc.h | 1 + include/hw/ppc/ppc4xx.h | 9 +- include/sysemu/hostmem.h | 20 ++- include/sysemu/numa.h | 1 + include/sysemu/sysemu.h | 2 - memory.c | 34 +++-- qdev-monitor.c | 6 + qemu-deprecated.texi | 9 -- qtest.c | 52 +++---- scripts/coccinelle/exec_rw_const.cocci | 111 ++++++++++++++ .../coccinelle/memory-region-housekeeping.cocci | 159 +++++++++++++++++++++ scripts/coccinelle/memory-region-init-ram.cocci | 38 ----- scripts/git.orderfile | 3 + softmmu/vl.c | 78 ++++++++-- target/i386/fpu_helper.c | 6 +- target/i386/hax-all.c | 6 +- target/i386/hvf/vmx.h | 7 +- target/i386/hvf/x86_mmu.c | 12 +- target/i386/whpx-all.c | 2 +- target/s390x/excp_helper.c | 2 +- target/s390x/helper.c | 6 +- target/s390x/mmu_helper.c | 2 +- tests/qtest/numa-test.c | 138 +++++++++--------- util/oslib-posix.c | 32 +++-- 163 files changed, 1524 insertions(+), 1244 deletions(-) create mode 100644 scripts/coccinelle/exec_rw_const.cocci create mode 100644 scripts/coccinelle/memory-region-housekeeping.cocci delete mode 100644 scripts/coccinelle/memory-region-init-ram.cocci --- hw/core/numa.c | 18 +----------------- qemu-deprecated.texi | 9 --------- 2 files changed, 1 insertion(+), 26 deletions(-) diff --git a/hw/core/numa.c b/hw/core/numa.c index 0d1b4be..840e685 100644 --- a/hw/core/numa.c +++ b/hw/core/numa.c @@ -784,24 +784,8 @@ static void allocate_system_memory_nonnuma(MemoryRegion *mr, Object *owner, { if (mem_path) { #ifdef __linux__ - Error *err = NULL; memory_region_init_ram_from_file(mr, owner, name, ram_size, 0, 0, - mem_path, &err); - if (err) { - error_report_err(err); - if (mem_prealloc) { - exit(1); - } - warn_report("falling back to regular RAM allocation"); - error_printf("This is deprecated. Make sure that -mem-path " - " specified path has sufficient resources to allocate" - " -m specified RAM amount\n"); - /* Legacy behavior: if allocation failed, fall back to - * regular RAM allocation. - */ - mem_path = NULL; - memory_region_init_ram_nomigrate(mr, owner, name, ram_size, &error_fatal); - } + mem_path, &error_fatal); #else fprintf(stderr, "-mem-path not supported on this host\n"); exit(1); diff --git a/qemu-deprecated.texi b/qemu-deprecated.texi index 0671c26..66eca3a 100644 --- a/qemu-deprecated.texi +++ b/qemu-deprecated.texi @@ -113,15 +113,6 @@ QEMU using implicit generic or board specific splitting rule. Use @option{memdev} with @var{memory-backend-ram} backend or @option{mem} (if it's supported by used machine type) to define mapping explictly instead. -@subsection -mem-path fallback to RAM (since 4.1) -Currently if guest RAM allocation from file pointed by @option{mem-path} -fails, QEMU falls back to allocating from RAM, which might result -in unpredictable behavior since the backing file specified by the user -is ignored. In the future, users will be responsible for making sure -the backing storage specified with @option{-mem-path} can actually provide -the guest RAM configured with @option{-m} and QEMU will fail to start up if -RAM allocation is unsuccessful. - @subsection RISC-V -bios (since 4.1) QEMU 4.1 introduced support for the -bios option in QEMU for RISC-V for the