# 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/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-gcc --version
# < /opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-ld --version
# < git log --format=%s --max-count=1 50087112592016a3fc10b394a55f1f1a1bde6908
# < make -s -j 24 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  defconfig
# make -s -j 24 ARCH=arm64 O=/kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4 CROSS_COMPILE=/opt/cross/kisskb/br-aarch64-glibc-2016.08-613-ge98b4dd/bin/aarch64-linux-  
arch/arm64/Makefile:27: ld does not support --fix-cortex-a53-843419; kernel may be susceptible to erratum
arch/arm64/Makefile:40: LSE atomics not supported by binutils
/kisskb/src/net/ipv4/fib_semantics.c: In function 'fib_check_nh_v4_gw':
/kisskb/src/net/ipv4/fib_semantics.c:1027:12: warning: 'err' may be used uninitialized in this function [-Wmaybe-uninitialized]
   if (!tbl || err) {
            ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c: In function 'sh_mobile_i2c_isr':
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:399:26: warning: 'data' may be used uninitialized in this function [-Wmaybe-uninitialized]
   pd->msg->buf[real_pos] = data;
                          ^
/kisskb/src/drivers/i2c/busses/i2c-sh_mobile.c:372:16: note: 'data' was declared here
  unsigned char data;
                ^
In file included from /kisskb/src/include/linux/rwsem.h:16:0,
                 from /kisskb/src/include/linux/notifier.h:15,
                 from /kisskb/src/include/linux/clk.h:17,
                 from /kisskb/src/drivers/tty/serial/sh-sci.c:24:
/kisskb/src/drivers/tty/serial/sh-sci.c: In function 'sci_dma_rx_submit':
/kisskb/src/include/linux/spinlock.h:288:3: warning: 'flags' may be used uninitialized in this function [-Wmaybe-uninitialized]
   _raw_spin_unlock_irqrestore(lock, flags); \
   ^
/kisskb/src/drivers/tty/serial/sh-sci.c:1353:16: note: 'flags' was declared here
  unsigned long flags;
                ^
Completed OK
# rm -rf /kisskb/build/powerpc-fixes_arm64-defconfig_arm64-gcc5.4
# Build took: 0:05:39.289700