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Nikunj A Dadhania fffb532378 KVM: x86: Check for rmaps allocation With TDP MMU being the default now, access to mmu_rmaps_stat debugfs file causes following oops: BUG: kernel NULL pointer dereference, address: 0000000000000000 PGD 0 P4D 0 Oops: 0000 [#1] PREEMPT SMP NOPTI CPU: 7 PID: 3185 Comm: cat Not tainted 5.16.0-rc4+ #204 RIP: 0010:pte_list_count+0x6/0x40 Call Trace: <TASK> ? kvm_mmu_rmaps_stat_show+0x15e/0x320 seq_read_iter+0x126/0x4b0 ? aa_file_perm+0x124/0x490 seq_read+0xf5/0x140 full_proxy_read+0x5c/0x80 vfs_read+0x9f/0x1a0 ksys_read+0x67/0xe0 __x64_sys_read+0x19/0x20 do_syscall_64+0x3b/0xc0 entry_SYSCALL_64_after_hwframe+0x44/0xae RIP: 0033:0x7fca6fc13912 Return early when rmaps are not present. Reported-by: Vasant Hegde <vasant.hegde@amd.com> Tested-by: Vasant Hegde <vasant.hegde@amd.com> Signed-off-by: Nikunj A Dadhania <nikunj@amd.com> Reviewed-by: Peter Xu <peterx@redhat.com> Reviewed-by: Sean Christopherson <seanjc@google.com> Message-Id: <20220105040337.4234-1-nikunj@amd.com> Cc: stable@vger.kernel.org Fixes: `3bcd0662d6` ("KVM: X86: Introduce mmu_rmaps_stat per-vm debugfs file") Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2022-01-07 12:04:01 -05:00
arch	KVM: x86: Check for rmaps allocation	2022-01-07 12:04:01 -05:00
block	block: call rq_qos_done() before ref check in batch completions	2021-11-26 09:53:23 -07:00
certs
crypto	Update to zstd-1.4.10	2021-11-13 15:32:30 -08:00
Documentation	KVM: VMX: Fix stale docs for kvm-intel.emulate_invalid_guest_state	2021-12-20 08:06:55 -05:00
drivers	parisc architecture bug and warning fixes for kernel v5.16-rc4	2021-12-05 12:58:18 -08:00
fs	Fixes for 5.16-rc3:	2021-12-04 17:22:53 -08:00
include	- Properly init uclamp_flags of a runqueue, on first enqueuing	2021-12-05 08:53:31 -08:00
init	kbuild: Fix -Wimplicit-fallthrough=5 error for GCC 5.x and 6.x	2021-11-14 18:59:49 -08:00
ipc	shm: extend forced shm destroy to support objects from several IPC nses	2021-11-20 10:35:54 -08:00
kernel	- Prevent a tick storm when a dedicated timekeeper CPU in nohz_full	2021-12-05 08:58:52 -08:00
lib	siphash: use _unaligned version by default	2021-11-29 19:50:50 -08:00
LICENSES
mm	Fixes for 5.16 folios:	2021-11-25 10:13:56 -08:00
net	Networking fixes for 5.16-rc4, including fixes from wireless,	2021-12-02 11:22:06 -08:00
samples	s390 updates for 5.16-rc2	2021-11-20 10:55:50 -08:00
scripts	Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/hid/hid	2021-11-24 09:44:13 -08:00
security	selinux: fix NULL-pointer dereference when hashtab allocation fails	2021-11-19 16:11:39 -05:00
sound	sound fixes for 5.16-rc4	2021-12-01 10:07:39 -08:00
tools	KVM: selftests: Add test to verify TRIPLE_FAULT on invalid L2 guest state	2021-12-20 08:06:55 -05:00
usr
virt	KVM: downgrade two BUG_ONs to WARN_ON_ONCE	2021-11-26 06:43:28 -05:00
.clang-format
.cocciconfig
.get_maintainer.ignore
.gitattributes
.gitignore
.mailmap	MAINTAINERS: update email address of Christian Borntraeger	2021-11-18 17:50:54 +01:00
COPYING
CREDITS
Kbuild
Kconfig
MAINTAINERS	TTY/Serial fixes for 5.16-rc4	2021-12-05 09:13:20 -08:00
Makefile	Linux 5.16-rc4	2021-12-05 14:08:22 -08:00
README

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.