Sean Christopherson 361209e054 KVM: Explicitly define the "memslot update in-progress" bit ... KVM uses bit 0 of the memslots generation as an "update in-progress" flag, which is used by x86 to prevent caching MMIO access while the memslots are changing. Although the intended behavior is flag-like, e.g. MMIO sptes intentionally drop the in-progress bit so as to avoid caching data from in-flux memslots, the implementation oftentimes treats the bit as part of the generation number itself, e.g. incrementing the generation increments twice, once to set the flag and once to clear it. Prior to commit 4bd518f159 ("KVM: use separate generations for each address space"), incorporating the "update in-progress" bit into the generation number largely made sense, e.g. "real" generations are even, "bogus" generations are odd, most code doesn't need to be aware of the bit, etc... Now that unique memslots generation numbers are assigned to each address space, stealthing the in-progress status into the generation number results in a wide variety of subtle code, e.g. kvm_create_vm() jumps over bit 0 when initializing the memslots generation without any hint as to why. Explicitly define the flag and convert as much code as possible (which isn't much) to actually treat it like a flag. This paves the way for eventually using a different bit for "update in-progress" so that it can be a flag in truth instead of a awkward extension to the generation number. Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2019-02-20 22:48:34 +01:00
..
arm	KVM: Call kvm_arch_memslots_updated() before updating memslots	2019-02-20 22:48:32 +01:00
async_pf.c	KVM: fix some typos	2018-12-21 11:28:26 +01:00
async_pf.h	KVM: fix checkpatch.pl errors in kvm/async_pf.h	2015-06-19 17:16:25 +02:00
coalesced_mmio.c	kvm: Add memcg accounting to KVM allocations	2019-02-20 22:48:29 +01:00
coalesced_mmio.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00
eventfd.c	kvm: Add memcg accounting to KVM allocations	2019-02-20 22:48:29 +01:00
irqchip.c	kvm: Add memcg accounting to KVM allocations	2019-02-20 22:48:29 +01:00
Kconfig	KVM: arm64: Prevent KVM_COMPAT from being selected	2018-06-21 17:17:50 +01:00
kvm_main.c	KVM: Explicitly define the "memslot update in-progress" bit	2019-02-20 22:48:34 +01:00
vfio.c	kvm: Add memcg accounting to KVM allocations	2019-02-20 22:48:29 +01:00
vfio.h	License cleanup: add SPDX GPL-2.0 license identifier to files with no license	2017-11-02 11:10:55 +01:00