# git rev-parse -q --verify 11c41994b1c3a7cb08c87883cc19d469258882b6^{commit}
11c41994b1c3a7cb08c87883cc19d469258882b6
already have revision, skipping fetch
# git checkout -q -f -B kisskb 11c41994b1c3a7cb08c87883cc19d469258882b6
# git clean -qxdf
# < git log -1
# commit 11c41994b1c3a7cb08c87883cc19d469258882b6
# Author: Michael Ellerman <mpe@ellerman.id.au>
# Date:   Fri Sep 24 01:10:31 2021 +1000
# 
#     KVM: PPC: Book3S HV: Use GLOBAL_TOC for kvmppc_h_set_dabr/xdabr()
#     
#     kvmppc_h_set_dabr(), and kvmppc_h_set_xdabr() which jumps into
#     it, need to use _GLOBAL_TOC to setup the kernel TOC pointer, because
#     kvmppc_h_set_dabr() uses LOAD_REG_ADDR() to load dawr_force_enable.
#     
#     When called from hcall_try_real_mode() we have the kernel TOC in r2,
#     established near the start of kvmppc_interrupt_hv(), so there is no
#     issue.
#     
#     But they can also be called from kvmppc_pseries_do_hcall() which is
#     module code, so the access ends up happening with the kvm-hv module's
#     r2, which will not point at dawr_force_enable and could even cause a
#     fault.
#     
#     With the current code layout and compilers we haven't observed a fault
#     in practice, the load hits somewhere in kvm-hv.ko and silently returns
#     some bogus value.
#     
#     Note that we we expect p8/p9 guests to use the DAWR, but SLOF uses
#     h_set_dabr() to test if sc1 works correctly, see SLOF's
#     lib/libhvcall/brokensc1.c.
#     
#     Fixes: c1fe190c0672 ("powerpc: Add force enable of DAWR on P9 option")
#     Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
#     Reviewed-by: Daniel Axtens <dja@axtens.net>
#     Link: https://lore.kernel.org/r/20210923151031.72408-1-mpe@ellerman.id.au
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-gcc --version
# < /opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-ld --version
# < git log --format=%s --max-count=1 11c41994b1c3a7cb08c87883cc19d469258882b6
# < make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  defconfig
# < make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  help
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  olddefconfig
# make -s -j 32 ARCH=s390 O=/kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-8.1.0-nolibc/s390-linux/bin/s390-linux-  
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_s390-defconfig_s390x-gcc8
# Build took: 0:03:12.182313