Buildresult: powerpc-fixes/s390-defconfig/s390x-gcc8 built on Jul 26 2021, 01:46

kisskb

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Status:	OK
Date/Time:	Jul 26 2021, 01:46
Duration:	0:05:59.505063
Builder:	blade46
Revision:	KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state (`d9c57d3ed52a92536f5fa59dc5ccdd58b4875076)`
Target:	powerpc-fixes/s390-defconfig/s390x-gcc8
Branch:	powerpc-fixes
Compiler:	s390x-gcc8 (s390-linux-gcc (GCC) 8.1.0 / GNU ld (GNU Binutils) 2.30)
Config:	defconfig (download)
Log:	Download original No warnings found in log. Full Log # git rev-parse -q --verify d9c57d3ed52a92536f5fa59dc5ccdd58b4875076^{commit} d9c57d3ed52a92536f5fa59dc5ccdd58b4875076 already have revision, skipping fetch # git checkout -q -f -B kisskb d9c57d3ed52a92536f5fa59dc5ccdd58b4875076 # git clean -qxdf # < git log -1 # commit d9c57d3ed52a92536f5fa59dc5ccdd58b4875076 # Author: Nicholas Piggin <npiggin@gmail.com> # Date: Thu Jul 8 21:26:22 2021 +1000 # # KVM: PPC: Book3S HV Nested: Sanitise H_ENTER_NESTED TM state # # The H_ENTER_NESTED hypercall is handled by the L0, and it is a request # by the L1 to switch the context of the vCPU over to that of its L2 # guest, and return with an interrupt indication. The L1 is responsible # for switching some registers to guest context, and the L0 switches # others (including all the hypervisor privileged state). # # If the L2 MSR has TM active, then the L1 is responsible for # recheckpointing the L2 TM state. Then the L1 exits to L0 via the # H_ENTER_NESTED hcall, and the L0 saves the TM state as part of the exit, # and then it recheckpoints the TM state as part of the nested entry and # finally HRFIDs into the L2 with TM active MSR. Not efficient, but about # the simplest approach for something that's horrendously complicated. # # Problems arise if the L1 exits to the L0 with a TM state which does not # match the L2 TM state being requested. For example if the L1 is # transactional but the L2 MSR is non-transactional, or vice versa. The # L0's HRFID can take a TM Bad Thing interrupt and crash. # # Fix this by disallowing H_ENTER_NESTED in TM[T] state entirely, and then # ensuring that if the L1 is suspended then the L2 must have TM active, # and if the L1 is not suspended then the L2 must not have TM active. # # Fixes: 360cae313702 ("KVM: PPC: Book3S HV: Nested guest entry via hypercall") # Cc: stable@vger.kernel.org # v4.20+ # Reported-by: Alexey Kardashevskiy <aik@ozlabs.ru> # Acked-by: Michael Neuling <mikey@neuling.org> # Signed-off-by: Nicholas Piggin <npiggin@gmail.com> # Signed-off-by: Michael Ellerman <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 d9c57d3ed52a92536f5fa59dc5ccdd58b4875076 # < 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: 0:05:59.505063

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