Buildresult: powerpc-fixes/g5_defconfig/powerpc-gcc5 built on Jun 21 2019, 00:04

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Status:	OK
Date/Time:	Jun 21 2019, 00:04
Duration:	0:01:02.447341
Builder:	ka4
Revision:	KVM: PPC: Book3S HV: Invalidate ERAT when flushing guest TLB entries (`50087112592016a3fc10b394a55f1f1a1bde6908)`
Target:	powerpc-fixes/g5_defconfig/powerpc-gcc5
Branch:	powerpc-fixes
Compiler:	powerpc-gcc5 (powerpc64-linux-gcc (GCC) 5.5.0 / GNU ld (GNU Binutils) 2.29.1.20170915)
Config:	g5_defconfig (download)
Log:	Download original Possible warnings (2) kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] WARNING: vmlinux.o(.text+0x30ba): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:.early_setup() Full Log # git rev-parse -q --verify 50087112592016a3fc10b394a55f1f1a1bde6908^{commit} 50087112592016a3fc10b394a55f1f1a1bde6908 already have revision, skipping fetch # git checkout -q -f -B kisskb 50087112592016a3fc10b394a55f1f1a1bde6908 # git clean -qxdf # < git log -1 # commit 50087112592016a3fc10b394a55f1f1a1bde6908 # Author: Suraj Jitindar Singh <sjitindarsingh@gmail.com> # Date: Thu Jun 20 11:46:49 2019 +1000 # # KVM: PPC: Book3S HV: Invalidate ERAT when flushing guest TLB entries # # When a guest vcpu moves from one physical thread to another it is # necessary for the host to perform a tlb flush on the previous core if # another vcpu from the same guest is going to run there. This is because the # guest may use the local form of the tlb invalidation instruction meaning # stale tlb entries would persist where it previously ran. This is handled # on guest entry in kvmppc_check_need_tlb_flush() which calls # flush_guest_tlb() to perform the tlb flush. # # Previously the generic radix__local_flush_tlb_lpid_guest() function was # used, however the functionality was reimplemented in flush_guest_tlb() # to avoid the trace_tlbie() call as the flushing may be done in real # mode. The reimplementation in flush_guest_tlb() was missing an erat # invalidation after flushing the tlb. # # This lead to observable memory corruption in the guest due to the # caching of stale translations. Fix this by adding the erat invalidation. # # Fixes: 70ea13f6e609 ("KVM: PPC: Book3S HV: Flush TLB on secondary radix threads") # Signed-off-by: Suraj Jitindar Singh <sjitindarsingh@gmail.com> # Signed-off-by: Michael Ellerman <mpe@ellerman.id.au> # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-gcc --version # < /opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux-ld --version # < git log --format=%s --max-count=1 50087112592016a3fc10b394a55f1f1a1bde6908 # < make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_g5_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- g5_defconfig # make -s -j 120 ARCH=powerpc O=/kisskb/build/powerpc-fixes_g5_defconfig_powerpc-gcc5 CROSS_COMPILE=/opt/cross/kisskb/korg/gcc-5.5.0-nolibc/powerpc64-linux/bin/powerpc64-linux- /kisskb/src/kernel/futex.c: In function 'do_futex': /kisskb/src/kernel/futex.c:1658:17: warning: 'oldval' may be used uninitialized in this function [-Wmaybe-uninitialized] return oldval == cmparg; ^ /kisskb/src/kernel/futex.c:1633:6: note: 'oldval' was declared here int oldval, ret; ^ WARNING: vmlinux.o(.text+0x30ba): Section mismatch in reference from the variable start_here_multiplatform to the function .init.text:.early_setup() The function start_here_multiplatform() references the function __init .early_setup(). This is often because start_here_multiplatform lacks a __init annotation or the annotation of .early_setup is wrong. Completed OK # rm -rf /kisskb/build/powerpc-fixes_g5_defconfig_powerpc-gcc5 # Build took: 0:01:02.447341

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