# git rev-parse -q --verify c9f016e72b5cc7d4d68fac51f8e72c8c7a69c06e^{commit}
c9f016e72b5cc7d4d68fac51f8e72c8c7a69c06e
already have revision, skipping fetch
# git checkout -q -f -B kisskb c9f016e72b5cc7d4d68fac51f8e72c8c7a69c06e
# git clean -qxdf
# < git log -1
# commit c9f016e72b5cc7d4d68fac51f8e72c8c7a69c06e
# Merge: 3df9427f351a a547a5880cba
# Author: Linus Torvalds <torvalds@linux-foundation.org>
# Date:   Sun Sep 1 14:43:08 2024 -0700
# 
#     Merge tag 'x86-urgent-2024-09-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip
#     
#     Pull x86 fixes from Thomas Gleixner:
#     
#      - x2apic_disable() clears x2apic_state and x2apic_mode unconditionally,
#        even when the state is X2APIC_ON_LOCKED, which prevents the kernel to
#        disable it thereby creating inconsistent state.
#     
#        Reorder the logic so it actually works correctly
#     
#      - The XSTATE logic for handling LBR is incorrect as it assumes that
#        XSAVES supports LBR when the CPU supports LBR. In fact both
#        conditions need to be true. Otherwise the enablement of LBR in the
#        IA32_XSS MSR fails and subsequently the machine crashes on the next
#        XRSTORS operation because IA32_XSS is not initialized.
#     
#        Cache the XSTATE support bit during init and make the related
#        functions use this cached information and the LBR CPU feature bit to
#        cure this.
#     
#      - Cure a long standing bug in KASLR
#     
#        KASLR uses the full address space between PAGE_OFFSET and vaddr_end
#        to randomize the starting points of the direct map, vmalloc and
#        vmemmap regions. It thereby limits the size of the direct map by
#        using the installed memory size plus an extra configurable margin for
#        hot-plug memory. This limitation is done to gain more randomization
#        space because otherwise only the holes between the direct map,
#        vmalloc, vmemmap and vaddr_end would be usable for randomizing.
#     
#        The limited direct map size is not exposed to the rest of the kernel,
#        so the memory hot-plug and resource management related code paths
#        still operate under the assumption that the available address space
#        can be determined with MAX_PHYSMEM_BITS.
#     
#        request_free_mem_region() allocates from (1 << MAX_PHYSMEM_BITS) - 1
#        downwards. That means the first allocation happens past the end of
#        the direct map and if unlucky this address is in the vmalloc space,
#        which causes high_memory to become greater than VMALLOC_START and
#        consequently causes iounmap() to fail for valid ioremap addresses.
#     
#        Cure this by exposing the end of the direct map via PHYSMEM_END and
#        use that for the memory hot-plug and resource management related
#        places instead of relying on MAX_PHYSMEM_BITS. In the KASLR case
#        PHYSMEM_END maps to a variable which is initialized by the KASLR
#        initialization and otherwise it is based on MAX_PHYSMEM_BITS as
#        before.
#     
#      - Prevent a data leak in mmio_read(). The TDVMCALL exposes the value of
#        an initialized variabled on the stack to the VMM. The variable is
#        only required as output value, so it does not have to exposed to the
#        VMM in the first place.
#     
#      - Prevent an array overrun in the resource control code on systems with
#        Sub-NUMA Clustering enabled because the code failed to adjust the
#        index by the number of SNC nodes per L3 cache.
#     
#     * tag 'x86-urgent-2024-09-01' of git://git.kernel.org/pub/scm/linux/kernel/git/tip/tip:
#       x86/resctrl: Fix arch_mbm_* array overrun on SNC
#       x86/tdx: Fix data leak in mmio_read()
#       x86/kaslr: Expose and use the end of the physical memory address space
#       x86/fpu: Avoid writing LBR bit to IA32_XSS unless supported
#       x86/apic: Make x2apic_disable() work correctly
# < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-ld --version
# < git log --format=%s --max-count=1 c9f016e72b5cc7d4d68fac51f8e72c8c7a69c06e
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  sun3_defconfig
# < make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  help
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  olddefconfig
# make -s -j 160 ARCH=m68k O=/kisskb/build/linus_sun3_defconfig_m68k-gcc11 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-11.3.0-nolibc/m68k-linux/bin/m68k-linux-  
Completed OK
# rm -rf /kisskb/build/linus_sun3_defconfig_m68k-gcc11
# Build took: 0:02:19.645086