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Sean Christopherson 00a669780f KVM: x86/mmu: Use MMU role to check for matching guest page sizes 
Originally, __kvm_sync_page used to check the cr4_pae bit in the role
to avoid zapping 4-byte kvm_mmu_pages when guest page size are 8-byte
or the other way round.  However, in commit 47c42e6b41 ("KVM: x86: fix
handling of role.cr4_pae and rename it to 'gpte_size'", 2019-03-28) it
was observed that this did not work for nested EPT, where the page table
size would be 8 bytes even if CR4.PAE=0.  (Note that the check still
has to be done for nested *NPT*, so it is not possible to use tdp_enabled
or similar).

Therefore, a hack was introduced to identify nested EPT shadow pages
and unconditionally call __kvm_sync_page() on them.  However, it is
possible to do without the hack to identify nested EPT shadow pages:
if EPT is active, there will be no shadow pages in non-EPT format,
and all of them will have gpte_is_8_bytes set to true; we can just
check the MMU role directly, and the test will always be true.

Even for non-EPT shadow MMUs, this test should really always be true
now that __kvm_sync_page() is called if and only if the role is an
exact match (kvm_mmu_get_page()) or is part of the current MMU context
(kvm_mmu_sync_roots()).  A future commit will convert the likely-pointless
check into a meaningful WARN to enforce that the mmu_roles of the current
context and the shadow page are compatible.

Cc: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Sean Christopherson <seanjc@google.com>
Message-Id: <20210622175739.3610207-11-seanjc@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
 		2021-06-24 18:00:37 -04:00
Documentation KVM: x86/mmu: Use MMU role to check for matching guest page sizes 2021-06-24 18:00:37 -04:00
LICENSES LICENSES: Add the CC-BY-4.0 license 2020-12-08 10:33:27 -07:00
arch KVM: x86/mmu: Use MMU role to check for matching guest page sizes 2021-06-24 18:00:37 -04:00
block block-5.13-2021-05-14 2021-05-15 08:52:30 -07:00
certs Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
crypto for-5.13/drivers-2021-04-27 2021-04-28 14:39:37 -07:00
drivers Driver core fixes for 5.13-rc2 2021-05-16 10:13:14 -07:00
fs Merge branch 'akpm' (patches from Andrew) 2021-05-15 09:42:27 -07:00
include KVM: debugfs: Reuse binary stats descriptors 2021-06-24 18:00:29 -04:00
init Merge branch 'akpm' (patches from Andrew) 2021-05-07 00:34:51 -07:00
ipc ipc/sem.c: spelling fix 2021-05-07 00:26:34 -07:00
kernel Two fixes for timers: 2021-05-16 09:42:13 -07:00
lib kasan: fix unit tests with CONFIG_UBSAN_LOCAL_BOUNDS enabled 2021-05-14 19:41:32 -07:00
mm mm/ioremap: fix iomap_max_page_shift 2021-05-14 19:41:32 -07:00
net mm: fix struct page layout on 32-bit systems 2021-05-14 19:41:32 -07:00
samples Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
scripts Kbuild updates for v5.13 (2nd) 2021-05-08 10:00:11 -07:00
security trusted-keys: match tpm_get_ops on all return paths 2021-05-12 22:36:37 +03:00
sound sound fixes for 5.13-rc1 2021-05-07 11:40:18 -07:00
tools KVM: selftests: Add selftest for KVM statistics data binary interface 2021-06-24 18:00:26 -04:00
usr .gitignore: prefix local generated files with a slash 2021-05-02 00:43:35 +09:00
virt KVM: debugfs: Reuse binary stats descriptors 2021-06-24 18:00:29 -04:00
.clang-format cxl for 5.12 2021-02-24 09:38:36 -08:00
.cocciconfig
…
.get_maintainer.ignore Opt out of scripts/get_maintainer.pl 2019-05-16 10:53:40 -07:00
.gitattributes .gitattributes: use 'dts' diff driver for dts files 2019-12-04 19:44:11 -08:00
.gitignore .gitignore: ignore only top-level modules.builtin 2021-05-02 00:43:35 +09:00
.mailmap Merge drm/drm-fixes into drm-misc-fixes 2021-05-11 13:35:52 +02:00
COPYING COPYING: state that all contributions really are covered by this file 2020-02-10 13:32:20 -08:00
CREDITS MAINTAINERS: move Murali Karicheri to credits 2021-04-29 15:47:30 -07:00
Kbuild kbuild: rename hostprogs-y/always to hostprogs/always-y 2020-02-04 01:53:07 +09:00
Kconfig kbuild: ensure full rebuild when the compiler is updated 2020-05-12 13:28:33 +09:00
MAINTAINERS libnvdimm fixes for 5.13-rc2 2021-05-15 08:32:51 -07:00
Makefile Linux 5.13-rc2 2021-05-16 15:27:44 -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.