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| author | Alexey Dobriyan <[email protected]> | 2024-08-02 18:42:51 +0300 |
|---|---|---|
| committer | Juergen Gross <[email protected]> | 2024-09-12 08:25:12 +0200 |
| commit | 661362e3dcab464d6b6976c019fd5b5433bda85f (patch) | |
| tree | 9b4d1de06c78d7f7176100b8c50dd99b7d5d54a5 /tools/perf/util/scripting-engines/trace-event-python.c | |
| parent | be35d91c8880650404f3bf813573222dfb106935 (diff) | |
xen, pvh: fix unbootable VMs (PVH + KASAN - AMD_MEM_ENCRYPT)
Uninstrument arch/x86/platform/pvh/enlighten.c: KASAN has not been setup
_this_ early in the boot process.
Steps to reproduce:
make allnoconfig
make sure CONFIG_AMD_MEM_ENCRYPT is disabled
AMD_MEM_ENCRYPT independently uninstruments lib/string.o
so PVH boot code calls into uninstrumented memset() and
memcmp() which can make the bug disappear depending on
the compiler.
enable CONFIG_PVH
enable CONFIG_KASAN
enable serial console
this is fun exercise if you never done it from nothing :^)
make
qemu-system-x86_64 \
-enable-kvm \
-cpu host \
-smp cpus=1 \
-m 4096 \
-serial stdio \
-kernel vmlinux \
-append 'console=ttyS0 ignore_loglevel'
Messages on serial console will easily tell OK kernel from unbootable
kernel. In bad case qemu hangs in an infinite loop stroboscoping
"SeaBIOS" message.
Signed-off-by: Alexey Dobriyan <[email protected]>
Acked-by: Juergen Gross <[email protected]>
Message-ID: <[email protected]>
Signed-off-by: Juergen Gross <[email protected]>
Diffstat (limited to 'tools/perf/util/scripting-engines/trace-event-python.c')
0 files changed, 0 insertions, 0 deletions