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Sean Christopherson 92f58b5c01 KVM: x86/mmu: Use fast invalidate mechanism to zap MMIO sptes 
Use the fast invalidate mechasim to zap MMIO sptes on a MMIO generation
wrap.  The fast invalidate flow was reintroduced to fix a livelock bug
in kvm_mmu_zap_all() that can occur if kvm_mmu_zap_all() is invoked when
the guest has live vCPUs.  I.e. using kvm_mmu_zap_all() to handle the
MMIO generation wrap is theoretically susceptible to the livelock bug.

This effectively reverts commit 4771450c34 ("Revert "KVM: MMU: drop
kvm_mmu_zap_mmio_sptes""), i.e. restores the behavior of commit
a8eca9dcc6 ("KVM: MMU: drop kvm_mmu_zap_mmio_sptes").

Note, this actually fixes commit 571c5af06e ("KVM: x86/mmu:
Voluntarily reschedule as needed when zapping MMIO sptes"), but there
is no need to incrementally revert back to using fast invalidate, e.g.
doing so doesn't provide any bisection or stability benefits.

Fixes: 571c5af06e ("KVM: x86/mmu: Voluntarily reschedule as needed when zapping MMIO sptes")
Cc: stable@vger.kernel.org
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2019-09-24 14:35:18 +02:00
arch KVM: x86/mmu: Use fast invalidate mechanism to zap MMIO sptes 2019-09-24 14:35:18 +02:00
block dma-mapping updates for 5.4: 2019-09-19 13:27:23 -07:00
certs Revert "Merge tag 'keys-acl-20190703' of git://git.kernel.org/pub/scm/linux/kernel/git/dhowells/linux-fs" 2019-07-10 18:43:43 -07:00
crypto - crypto and DM crypt advances that allow the crypto API to reclaim 2019-09-21 10:40:37 -07:00
Documentation KVM/Hyper-V: Add new KVM capability KVM_CAP_HYPERV_DIRECT_TLBFLUSH 2019-09-24 13:37:13 +02:00
drivers - New Drivers 2019-09-23 19:37:49 -07:00
fs selinux/stable-5.4 PR 20190917 2019-09-23 11:21:04 -07:00
include cpu/SMT: create and export cpu_smt_possible() 2019-09-24 13:37:28 +02:00
init Modules updates for v5.4 2019-09-22 10:34:46 -07:00
ipc Merge branch 'work.mount-base' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2019-09-18 13:15:58 -07:00
kernel cpu/SMT: create and export cpu_smt_possible() 2019-09-24 13:37:28 +02:00
lib Modules updates for v5.4 2019-09-22 10:34:46 -07:00
LICENSES LICENSES: Rename other to deprecated 2019-05-03 06:34:32 -06:00
mm hmm related patches for 5.4 2019-09-21 10:07:42 -07:00
net RDMA subsystem updates for 5.4 2019-09-21 10:26:24 -07:00
samples rpmsg updates for v5.4 2019-09-22 10:58:15 -07:00
scripts Modules updates for v5.4 2019-09-22 10:34:46 -07:00
security I have four patches for v5.4. Nothing is major. All but one are in 2019-09-23 14:25:45 -07:00
sound Main MIPS changes for v5.4: 2019-09-22 09:30:30 -07:00
tools KVM: selftests: hyperv_cpuid: add check for NoNonArchitecturalCoreSharing bit 2019-09-24 13:37:31 +02:00
usr kbuild: remove clean-dirs syntax 2019-08-29 23:54:29 +09:00
virt * s390: ioctl hardening, selftests 2019-09-18 09:49:13 -07:00
.clang-format clang-format: Update with the latest for_each macro list 2019-08-31 10:00:51 +02:00
.cocciconfig
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes
.gitignore Modules updates for v5.4 2019-09-22 10:34:46 -07:00
.mailmap Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2019-09-18 12:34:53 -07:00
COPYING COPYING: use the new text with points to the license files 2018-03-23 12:41:45 -06:00
CREDITS CREDITS: Update email address 2019-09-13 17:21:38 +03:00
Kbuild kbuild: do not descend to ./Kbuild when cleaning 2019-08-21 21:03:58 +09:00
Kconfig docs: kbuild: convert docs to ReST and rename to *.rst 2019-06-14 14:21:21 -06:00
MAINTAINERS - New Drivers 2019-09-23 19:37:49 -07:00
Makefile Modules updates for v5.4 2019-09-22 10:34:46 -07:00
README Drop all 00-INDEX files from Documentation/ 2018-09-09 15:08:58 -06:00

README 

Linux kernel
============

There are several guides for kernel developers and users. These guides can
be rendered in a number of formats, like HTML and PDF. Please read
Documentation/admin-guide/README.rst first.

In order to build the documentation, use ``make htmldocs`` or
``make pdfdocs``.  The formatted documentation can also be read online at:

    https://www.kernel.org/doc/html/latest/

There are various text files in the Documentation/ subdirectory,
several of them using the Restructured Text markup notation.

Please read the Documentation/process/changes.rst file, as it contains the
requirements for building and running the kernel, and information about
the problems which may result by upgrading your kernel.