https://github.com/torvalds/linux
This fixes a bug where the trap number that is returned by __kvmppc_vcore_entry gets corrupted. The effect of the corruption is that IPIs get ignored on POWER9 systems when the IPI is sent via a doorbell interrupt to a CPU which is executing in a KVM guest. The effect of the IPI being ignored is often that another CPU locks up inside smp_call_function_many() (and if that CPU is holding a spinlock, other CPUs then lock up inside raw_spin_lock()). The trap number is currently held in register r12 for most of the assembly-language part of the guest exit path. In that path, we call kvmppc_subcore_exit_guest(), which is a C function, without restoring r12 afterwards. Depending on the kernel config and the compiler, it may modify r12 or it may not, so some config/compiler combinations see the bug and others don't. To fix this, we arrange for the trap number to be stored on the stack from the 'guest_bypass:' label until the end of the function, then the trap number is loaded and returned in r12 as before. Cc: stable@vger.kernel.org # v4.8+ Fixes: fd7bacbca47a ("KVM: PPC: Book3S HV: Fix TB corruption in guest exit path on HMI interrupt") Signed-off-by: Paul Mackerras <paulus@ozlabs.org>
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KVM: PPC: Book3S HV: Fix trap number return from __kvmppc_vcore_entry
File | Mode | Size |
---|---|---|
Makefile | -rw-r--r-- | 361 bytes |
compat.c | -rw-r--r-- | 2.2 KB |
ipc_sysctl.c | -rw-r--r-- | 5.4 KB |
mq_sysctl.c | -rw-r--r-- | 2.9 KB |
mqueue.c | -rw-r--r-- | 39.7 KB |
msg.c | -rw-r--r-- | 27.5 KB |
msgutil.c | -rw-r--r-- | 3.6 KB |
namespace.c | -rw-r--r-- | 4.8 KB |
sem.c | -rw-r--r-- | 58.3 KB |
shm.c | -rw-r--r-- | 38.8 KB |
syscall.c | -rw-r--r-- | 4.3 KB |
util.c | -rw-r--r-- | 22.3 KB |
util.h | -rw-r--r-- | 7.2 KB |
Computing file changes ...