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linux/arch/s390/kvm
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Claudio Imbrenda 5ff9218157 KVM: s390: pv: simplify shutdown and fix race 
Simplify the shutdown of non-protected VMs. There is no need to do
complex manipulations of the counter if it was zero.

This also fixes a very rare race which caused pages to be torn down
from the address space with a non-zero counter even on older machines
that don't support the UVC instruction, causing a crash.

Reported-by: Marc Hartmayer <mhartmay@linux.ibm.com>
Fixes: fb491d5500 ("KVM: s390: pv: asynchronous destroy for reboot")
Reviewed-by: Nico Boehr <nrb@linux.ibm.com>
Signed-off-by: Claudio Imbrenda <imbrenda@linux.ibm.com>
Message-ID: <20230705111937.33472-2-imbrenda@linux.ibm.com>
2023-07-18 11:21:51 +02:00
..
diag.c KVM: s390/diag: fix racy access of physical cpu number in diag 9c handler 2023-06-16 11:08:09 +02:00
gaccess.c s390: fix various typos 2023-07-03 11:19:42 +02:00
gaccess.h KVM: s390: Extend MEM_OP ioctl by storage key checked cmpxchg 2023-02-07 18:06:00 +01:00
guestdbg.c KVM: s390: Add memcg accounting to KVM allocations 2020-12-10 13:36:05 +01:00
intercept.c s390: fix various typos 2023-07-03 11:19:42 +02:00
interrupt.c mm/gup: remove vmas parameter from get_user_pages_remote() 2023-06-09 16:25:26 -07:00
Kconfig kvm: Remove "select SRCU" 2023-04-05 13:47:42 +00:00
kvm-s390.c s390 updates for 6.5 merge window part 2 2023-07-06 13:18:30 -07:00
kvm-s390.h KVM: s390: Mark __kvm_s390_init() and its descendants as __init 2022-12-29 15:41:22 -05:00
Makefile KVM: s390: pci: add basic kvm_zdev structure 2022-07-11 09:54:27 +02:00
pci.c s390: fix various typos 2023-07-03 11:19:42 +02:00
pci.h KVM: s390: Mark __kvm_s390_init() and its descendants as __init 2022-12-29 15:41:22 -05:00
priv.c s390: include linux/io.h instead of asm/io.h 2023-07-03 11:19:40 +02:00
pv.c KVM: s390: pv: simplify shutdown and fix race 2023-07-18 11:21:51 +02:00
sigp.c s390: fix various typos 2023-07-03 11:19:42 +02:00
trace-s390.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
trace.h License cleanup: add SPDX GPL-2.0 license identifier to files with no license 2017-11-02 11:10:55 +01:00
vsie.c s390 updates for 6.5 merge window part 2 2023-07-06 13:18:30 -07:00