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Raghavendra Rao Ananta e423893fe3 selftests: KVM: Handle compiler optimizations in ucall 
[ Upstream commit 9e2f6498ef ]

The selftests, when built with newer versions of clang, is found
to have over optimized guests' ucall() function, and eliminating
the stores for uc.cmd (perhaps due to no immediate readers). This
resulted in the userspace side always reading a value of '0', and
causing multiple test failures.

As a result, prevent the compiler from optimizing the stores in
ucall() with WRITE_ONCE().

Suggested-by: Ricardo Koller <ricarkol@google.com>
Suggested-by: Reiji Watanabe <reijiw@google.com>
Signed-off-by: Raghavendra Rao Ananta <rananta@google.com>
Message-Id: <20220615185706.1099208-1-rananta@google.com>
Reviewed-by: Andrew Jones <drjones@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Signed-off-by: Sasha Levin <sashal@kernel.org>
History 2022-08-11 13:07:51 +02:00
..
accounting SPDX patches for 5.7-rc1. 2020-04-03 13:12:26 -07:00
arch tools headers cpufeatures: Sync with the kernel sources 2022-07-23 12:54:13 +02:00
bootconfig tools/bootconfig: Define memblock_free_ptr() to fix build error 2021-09-15 09:49:48 -07:00
bpf bpftool: Fix the error when lookup in no-btf maps 2022-04-08 14:23:31 +02:00
build perf build: Fix btf__load_from_kernel_by_id() feature check 2022-06-09 10:23:16 +02:00
cgroup tools/cgroup/slabinfo.py: updated to work on current kernel 2021-04-23 14:42:40 -07:00
debugging tools: Fix "the the" in a message in kernel-chktaint 2021-06-13 17:01:17 -06:00
edid tools/edid: Move EDID data sets from Documentation/ 2020-02-19 04:10:32 -07:00
firewire treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 156 2019-05-30 11:26:35 -07:00
firmware Driver Core and debugfs changes for 5.3-rc1 2019-07-12 12:24:03 -07:00
gpio tools: gpio-utils: fix various kernel-doc warnings 2021-03-26 14:56:19 +01:00
hv tools: hv: change http to https in hv_kvp_daemon.c 2020-07-06 10:46:23 +00:00
iio iio: event_monitor: Enable events before monitoring 2021-03-25 19:13:52 +00:00
include selftests/bpf: Extend verifier and bpf_sock tests for dst_port loads 2022-08-11 13:07:50 +02:00
io_uring tools/io_uring/io_uring-cp: sync with liburing example 2021-08-13 08:58:11 -06:00
kvm/kvm_stat tools/kvm_stat: fix display of error when multiple processes are found 2022-08-11 13:07:51 +02:00
laptop change email address for Pali Rohár 2020-04-10 15:36:22 -07:00
leds .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
lib libbpf: Fix logic for finding matching program for CO-RE relocation 2022-06-09 10:22:51 +02:00
memory-model tools/memory-model: Document data_race(READ_ONCE()) 2021-07-27 11:48:55 -07:00
objtool x86/retbleed: Add fine grained Kconfig knobs 2022-07-23 12:54:10 +02:00
pci tools: PCI: Zero-initialize param 2021-08-05 11:01:30 +01:00
pcmcia .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
perf perf symbol: Correct address for bss symbols 2022-08-03 12:03:54 +02:00
power tools/power turbostat: fix ICX DRAM power numbers 2022-06-09 10:22:32 +02:00
rcu tools/rcu: Add drgn script to dump number of RCU callbacks 2021-05-10 15:39:19 -07:00
scripts tools build: Fix quiet cmd indentation 2021-05-17 12:10:03 +09:00
spi spi: tools: make a symbolic link to the header file spi.h 2021-04-22 16:30:39 +01:00
testing selftests: KVM: Handle compiler optimizations in ucall 2022-08-11 13:07:51 +02:00
thermal/tmon tools/thermal/tmon: Add cross compiling support 2021-08-14 15:33:19 +02:00
time treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 282 2019-06-05 17:36:37 +02:00
tracing tools/latency-collector: Use correct size when writing queue_full_warning 2021-11-18 19:16:19 +01:00
usb usb: testusb: Fix for showing the connection speed 2021-09-14 10:31:41 +02:00
virtio tools/virtio: compile with -pthread 2022-05-25 09:57:25 +02:00
vm tools/vm/slabinfo: Handle files in debugfs 2022-08-11 13:07:50 +02:00
wmi treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 500 2019-06-19 17:09:55 +02:00
Makefile tracing/tools: Add the latency-collector to tools directory 2021-02-12 11:52:59 -05:00