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From:   Ard Biesheuvel <ardb@kernel.org>
Date:   Tue, 3 Mar 2020 22:40:23 +0100
Message-ID: <CAKv+Gu9bqB-nxk76ZKeaC14dTemS8ZZNtrwHd6PUWknkqnAueQ@mail.gmail.com>
Subject: Re: [PATCH 16/18] efi: add 'runtime' pointer to struct efi
To:     Guenter Roeck <linux@roeck-us.net>
Cc:     linux-efi <linux-efi@vger.kernel.org>,
        Arvind Sankar <nivedita@alum.mit.edu>,
        "the arch/x86 maintainers" <x86@kernel.org>,
        Linux Kernel Mailing List <linux-kernel@vger.kernel.org>,
        linux-arm-kernel <linux-arm-kernel@lists.infradead.org>
Content-Type: text/plain; charset="UTF-8"
Sender: linux-kernel-owner@vger.kernel.org
Precedence: bulk

On Tue, 3 Mar 2020 at 21:30, Guenter Roeck <linux@roeck-us.net> wrote:
>
> On Tue, Mar 03, 2020 at 07:14:52PM +0100, Ard Biesheuvel wrote:
> > On Tue, 3 Mar 2020 at 19:01, Ard Biesheuvel <ardb@kernel.org> wrote:
> > >
> > > On Tue, 3 Mar 2020 at 18:54, Guenter Roeck <linux@roeck-us.net> wrote:
> > > >
> > > > On Tue, Mar 03, 2020 at 05:39:43PM +0100, Ard Biesheuvel wrote:
> > > > > On Tue, 3 Mar 2020 at 17:03, Guenter Roeck <linux@roeck-us.net> wrote:
> > > > > >
> > > > > > On Sun, Feb 16, 2020 at 07:23:32PM +0100, Ard Biesheuvel wrote:
> > > > > > > Instead of going through the EFI system table each time, just copy the
> > > > > > > runtime services table pointer into struct efi directly. This is the
> > > > > > > last use of the system table pointer in struct efi, allowing us to
> > > > > > > drop it in a future patch, along with a fair amount of quirky handling
> > > > > > > of the translated address.
> > > > > > >
> > > > > > > Note that usually, the runtime services pointer changes value during
> > > > > > > the call to SetVirtualAddressMap(), so grab the updated value as soon
> > > > > > > as that call returns. (Mixed mode uses a 1:1 mapping, and kexec boot
> > > > > > > enters with the updated address in the system table, so in those cases,
> > > > > > > we don't need to do anything here)
> > > > > > >
> > > > > > > Signed-off-by: Ard Biesheuvel <ardb@kernel.org>
> > > > > >
> > > > > > This patch results in a crash with i386 efi boots if PAE (CONFIG_HIGHMEM64G=y)
> > > > > > is enabled. Bisect and crash logs attached. There is also a warning which
> > > > > > I don't recall seeing before, but it may not be caused by this patch
> > > > > > (I didn' bisect the warning). The warning is seen with all i386:efi boots,
> > > > > > not only when PAE is enabled. The warning log is also attached.
> > > > > >
> > > > > > Guenter
> > > > > >
> > > > > > ---
> > > > > > Qemu command line:
> > > > > >
> > > > > > qemu-system-i386 -kernel arch/x86/boot/bzImage -M pc -cpu Westmere \
> > > > > >         -no-reboot -m 256 -snapshot \
> > > > > >         -bios OVMF-pure-efi-32.fd \
> > > > > >         -usb -device usb-storage,drive=d0 \
> > > > > >         -drive file=rootfs.ext2,if=none,id=d0,format=raw \
> > > > > >         --append 'earlycon=uart8250,io,0x3f8,9600n8 panic=-1 slub_debug=FZPUA root=/dev/sda rootwait mem=256M console=ttyS0' \
> > > > > >         -nographic
> > > > > >
> > > > >
> > > > > I am failing to reproduce this. Do you have a .config and a copy of
> > > > > OVMF-pure-efi-32.fd anywhere?
> > > > >
> > > >
> > > > https://github.com/groeck/linux-build-test/blob/master/rootfs/firmware/OVMF-pure-efi-32.fd
> > > > https://github.com/groeck/linux-build-test/blob/master/rootfs/x86/rootfs.ext2.gz
> > > >
> > > > Config file is below, shortened by "make savedefconfig" on the actual
> > > > configuration used on next-20200303. Qemu version is 4.2, though that
> > > > should not really matter. Note that it isn't necessary to boot from usb,
> > > > that was just my test case.
> > > >
> > > > Here is a pointer to a complete log, showing the various conditions
> > > > resulting in the warning and the crash:
> > > >
> > > > https://kerneltests.org/builders/qemu-x86-next/builds/1310/steps/qemubuildcommand_1/logs/stdio
> > > >
> > >
> > > Thanks.
> > >
> > > How do I generate your exact .config from the below? I still cannot
> > > reproduce with the different firmware.
> > >
> > > My qemu is 3.1 btw
> > >
> >
> > Also, I don't see CONFIG_HIGHMEM64G=y anywhere below??
> >
>
> Sorry, I should have used make ARCH=i386 savedefconfig. Another attempt
> below. This needs to be built with "make ARCH=i386".
>

It still doesn't enable CONFIG_HIGHMEM64G, and so it is not entirely
clear to me how I should derive your failing config from this.
Couldn't you simply share the whole thing?


> CONFIG_SYSVIPC=y
> CONFIG_PREEMPT=y
> CONFIG_BSD_PROCESS_ACCT=y
> CONFIG_LOG_BUF_SHIFT=14
> CONFIG_EXPERT=y
> CONFIG_PROFILING=y
> CONFIG_ARCH_PXA=y
> CONFIG_PXA_SHARPSL=y
> CONFIG_MACH_AKITA=y
> CONFIG_MACH_BORZOI=y
> CONFIG_ZBOOT_ROM_TEXT=0x0
> CONFIG_ZBOOT_ROM_BSS=0x0
> CONFIG_CMDLINE="console=ttyS0,115200n8 console=tty1 noinitrd root=/dev/mtdblock2 rootfstype=jffs2   debug"
> CONFIG_FPE_NWFPE=y
> CONFIG_OPROFILE=m
> CONFIG_MODULES=y
> CONFIG_MODULE_UNLOAD=y
> CONFIG_MODULE_FORCE_UNLOAD=y
> # CONFIG_BLK_DEV_BSG is not set
> CONFIG_PARTITION_ADVANCED=y
> CONFIG_BINFMT_MISC=m
> CONFIG_NET=y
> CONFIG_PACKET=y
> CONFIG_UNIX=y
> CONFIG_INET=y
> CONFIG_SYN_COOKIES=y
> CONFIG_INET6_AH=m
> CONFIG_INET6_ESP=m
> CONFIG_INET6_IPCOMP=m
> CONFIG_IPV6_TUNNEL=m
> CONFIG_NETFILTER=y
> CONFIG_IP_NF_IPTABLES=m
> CONFIG_IP_NF_MATCH_ECN=m
> CONFIG_IP_NF_MATCH_TTL=m
> CONFIG_IP_NF_FILTER=m
> CONFIG_IP_NF_MANGLE=m
> CONFIG_IP_NF_RAW=m
> CONFIG_IP_NF_ARPTABLES=m
> CONFIG_IP_NF_ARPFILTER=m
> CONFIG_IP_NF_ARP_MANGLE=m
> CONFIG_IP6_NF_IPTABLES=m
> CONFIG_IP6_NF_MATCH_EUI64=m
> CONFIG_IP6_NF_MATCH_FRAG=m
> CONFIG_IP6_NF_MATCH_OPTS=m
> CONFIG_IP6_NF_MATCH_HL=m
> CONFIG_IP6_NF_MATCH_IPV6HEADER=m
> CONFIG_IP6_NF_MATCH_RT=m
> CONFIG_IP6_NF_FILTER=m
> CONFIG_IP6_NF_MANGLE=m
> CONFIG_IP6_NF_RAW=m
> CONFIG_BT=m
> CONFIG_BT_RFCOMM=m
> CONFIG_BT_RFCOMM_TTY=y
> CONFIG_BT_BNEP=m
> CONFIG_BT_BNEP_MC_FILTER=y
> CONFIG_BT_BNEP_PROTO_FILTER=y
> CONFIG_BT_HIDP=m
> CONFIG_BT_HCIUART=m
> CONFIG_BT_HCIUART_H4=y
> CONFIG_BT_HCIUART_BCSP=y
> CONFIG_BT_HCIBCM203X=m
> CONFIG_BT_HCIBPA10X=m
> CONFIG_BT_HCIBFUSB=m
> CONFIG_BT_HCIDTL1=m
> CONFIG_BT_HCIBT3C=m
> CONFIG_BT_HCIBLUECARD=m
> CONFIG_BT_HCIVHCI=m
> CONFIG_PCCARD=y
> CONFIG_PCMCIA_PXA2XX=y
> CONFIG_MTD=y
> CONFIG_MTD_CMDLINE_PARTS=y
> CONFIG_MTD_BLOCK=y
> CONFIG_MTD_ROM=y
> CONFIG_MTD_COMPLEX_MAPPINGS=y
> CONFIG_MTD_RAW_NAND=y
> CONFIG_MTD_NAND_SHARPSL=y
> CONFIG_BLK_DEV_LOOP=y
> CONFIG_BLK_DEV_SD=y
> CONFIG_CHR_DEV_ST=m
> CONFIG_BLK_DEV_SR=m
> CONFIG_CHR_DEV_SG=m
> CONFIG_ATA=y
> CONFIG_PATA_PCMCIA=y
> CONFIG_NETDEVICES=y
> CONFIG_PCMCIA_PCNET=m
> CONFIG_PPP=m
> CONFIG_PPP_BSDCOMP=m
> CONFIG_PPP_ASYNC=m
> CONFIG_USB_CATC=m
> CONFIG_USB_KAWETH=m
> CONFIG_USB_PEGASUS=m
> CONFIG_USB_RTL8150=m
> CONFIG_USB_USBNET=m
> # CONFIG_USB_NET_CDC_SUBSET is not set
> CONFIG_INPUT_EVDEV=y
> # CONFIG_KEYBOARD_ATKBD is not set
> # CONFIG_INPUT_MOUSE is not set
> CONFIG_INPUT_TOUCHSCREEN=y
> CONFIG_TOUCHSCREEN_ADS7846=y
> CONFIG_INPUT_MISC=y
> CONFIG_INPUT_UINPUT=m
> # CONFIG_SERIO is not set
> # CONFIG_LEGACY_PTYS is not set
> CONFIG_SERIAL_8250=m
> CONFIG_SERIAL_8250_CS=m
> CONFIG_SERIAL_PXA=y
> CONFIG_SERIAL_PXA_CONSOLE=y
> CONFIG_SPI_PXA2XX=y
> CONFIG_FB=y
> CONFIG_FB_PXA=y
> CONFIG_LCD_CLASS_DEVICE=y
> CONFIG_LCD_CORGI=y
> CONFIG_BACKLIGHT_CLASS_DEVICE=y
> CONFIG_FRAMEBUFFER_CONSOLE=y
> CONFIG_FRAMEBUFFER_CONSOLE_ROTATION=y
> CONFIG_HID_A4TECH=m
> CONFIG_HID_APPLE=m
> CONFIG_HID_BELKIN=m
> CONFIG_HID_CHERRY=m
> CONFIG_HID_CHICONY=m
> CONFIG_HID_CYPRESS=m
> CONFIG_HID_EZKEY=m
> CONFIG_HID_GYRATION=m
> CONFIG_HID_MICROSOFT=m
> CONFIG_HID_MONTEREY=m
> CONFIG_HID_PANTHERLORD=m
> CONFIG_HID_PETALYNX=m
> CONFIG_HID_SAMSUNG=m
> CONFIG_HID_SUNPLUS=m
> CONFIG_USB_KBD=m
> CONFIG_USB_MOUSE=m
> CONFIG_USB=m
> CONFIG_USB_MON=m
> CONFIG_USB_OHCI_HCD=m
> CONFIG_USB_SL811_HCD=m
> CONFIG_USB_SL811_CS=m
> CONFIG_USB_ACM=m
> CONFIG_USB_PRINTER=m
> CONFIG_USB_STORAGE=m
> CONFIG_USB_MDC800=m
> CONFIG_USB_MICROTEK=m
> CONFIG_USB_SERIAL=m
> CONFIG_USB_SERIAL_GENERIC=y
> CONFIG_USB_SERIAL_BELKIN=m
> CONFIG_USB_SERIAL_DIGI_ACCELEPORT=m
> CONFIG_USB_SERIAL_CYPRESS_M8=m
> CONFIG_USB_SERIAL_EMPEG=m
> CONFIG_USB_SERIAL_FTDI_SIO=m
> CONFIG_USB_SERIAL_VISOR=m
> CONFIG_USB_SERIAL_IPAQ=m
> CONFIG_USB_SERIAL_IR=m
> CONFIG_USB_SERIAL_EDGEPORT=m
> CONFIG_USB_SERIAL_EDGEPORT_TI=m
> CONFIG_USB_SERIAL_GARMIN=m
> CONFIG_USB_SERIAL_IPW=m
> CONFIG_USB_SERIAL_KEYSPAN_PDA=m
> CONFIG_USB_SERIAL_KEYSPAN=m
> CONFIG_USB_SERIAL_KLSI=m
> CONFIG_USB_SERIAL_KOBIL_SCT=m
> CONFIG_USB_SERIAL_MCT_U232=m
> CONFIG_USB_SERIAL_PL2303=m
> CONFIG_USB_SERIAL_SAFE=m
> CONFIG_USB_SERIAL_TI=m
> CONFIG_USB_SERIAL_CYBERJACK=m
> CONFIG_USB_SERIAL_XIRCOM=m
> CONFIG_USB_SERIAL_OMNINET=m
> CONFIG_USB_EMI62=m
> CONFIG_USB_EMI26=m
> CONFIG_USB_LEGOTOWER=m
> CONFIG_USB_LCD=m
> CONFIG_USB_CYTHERM=m
> CONFIG_USB_IDMOUSE=m
> CONFIG_USB_GADGET=m
> CONFIG_USB_ZERO=m
> CONFIG_USB_ETH=m
> CONFIG_USB_GADGETFS=m
> CONFIG_USB_MASS_STORAGE=m
> CONFIG_USB_G_SERIAL=m
> CONFIG_MMC=y
> CONFIG_MMC_PXA=y
> CONFIG_EXT2_FS=y
> CONFIG_EXT2_FS_XATTR=y
> CONFIG_EXT2_FS_POSIX_ACL=y
> CONFIG_EXT2_FS_SECURITY=y
> CONFIG_EXT3_FS=y
> CONFIG_MSDOS_FS=y
> CONFIG_VFAT_FS=y
> CONFIG_TMPFS=y
> CONFIG_JFFS2_FS=y
> CONFIG_JFFS2_SUMMARY=y
> CONFIG_JFFS2_COMPRESSION_OPTIONS=y
> CONFIG_JFFS2_RUBIN=y
> CONFIG_CRAMFS=m
> CONFIG_NFS_FS=m
> CONFIG_NFS_V4=m
> CONFIG_NLS_DEFAULT="cp437"
> CONFIG_NLS_CODEPAGE_437=y
> CONFIG_NLS_ISO8859_1=y
> CONFIG_NLS_UTF8=y
> CONFIG_CRYPTO_TEST=m
> CONFIG_CRYPTO_HMAC=y
> CONFIG_CRYPTO_MD4=m
> CONFIG_CRYPTO_MICHAEL_MIC=m
> CONFIG_CRYPTO_SHA512=m
> CONFIG_CRYPTO_WP512=m
> CONFIG_CRYPTO_ANUBIS=m
> CONFIG_CRYPTO_ARC4=m
> CONFIG_CRYPTO_BLOWFISH=m
> CONFIG_CRYPTO_CAST5=m
> CONFIG_CRYPTO_CAST6=m
> CONFIG_CRYPTO_KHAZAD=m
> CONFIG_CRYPTO_SERPENT=m
> CONFIG_CRYPTO_TEA=m
> CONFIG_CRYPTO_TWOFISH=m
> CONFIG_CRC_CCITT=y
> CONFIG_LIBCRC32C=m
> CONFIG_FONTS=y
> CONFIG_FONT_8x8=y
> CONFIG_FONT_8x16=y
> CONFIG_MAGIC_SYSRQ=y
> # CONFIG_DEBUG_PREEMPT is not set
> # CONFIG_FTRACE is not set
> CONFIG_DEBUG_LL=y