Ben Gardon a889ea54b3 KVM: x86/mmu: Ensure TDP MMU roots are freed after yield ... Many TDP MMU functions which need to perform some action on all TDP MMU roots hold a reference on that root so that they can safely drop the MMU lock in order to yield to other threads. However, when releasing the reference on the root, there is a bug: the root will not be freed even if its reference count (root_count) is reduced to 0. To simplify acquiring and releasing references on TDP MMU root pages, and to ensure that these roots are properly freed, move the get/put operations into another TDP MMU root iterator macro. Moving the get/put operations into an iterator macro also helps simplify control flow when a root does need to be freed. Note that using the list_for_each_entry_safe macro would not have been appropriate in this situation because it could keep a pointer to the next root across an MMU lock release + reacquire, during which time that root could be freed. Reported-by: Maciej S. Szmigiero <maciej.szmigiero@oracle.com> Suggested-by: Paolo Bonzini <pbonzini@redhat.com> Fixes: faaf05b00a ("kvm: x86/mmu: Support zapping SPTEs in the TDP MMU") Fixes: 063afacd87 ("kvm: x86/mmu: Support invalidate range MMU notifier for TDP MMU") Fixes: a6a0b05da9 ("kvm: x86/mmu: Support dirty logging for the TDP MMU") Fixes: 1488199856 ("kvm: x86/mmu: Support disabling dirty logging for the tdp MMU") Signed-off-by: Ben Gardon <bgardon@google.com> Message-Id: <20210107001935.3732070-1-bgardon@google.com> Cc: stable@vger.kernel.org Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2021-01-07 18:11:31 -05:00
..
boot	A set of fixes for x86:	2020-12-06 11:22:39 -08:00
configs	* A defconfig fix, from Daniel Díaz.	2020-09-20 15:06:43 -07:00
crypto	crypto: x86/poly1305 - add back a needed assignment	2020-10-24 09:38:32 +11:00
entry	A couple of x86 fixes which missed rc1 due to my stupidity:	2020-10-27 14:39:29 -07:00
events	perf/x86/intel: Check PEBS status correctly	2020-12-03 10:00:26 +01:00
hyperv	hyperv-fixes for 5.10-rc3	2020-11-05 11:32:03 -08:00
ia32	x86: remove address space overrides using set_fs()	2020-09-08 22:21:36 -04:00
include	Merge branch 'kvm-master' into kvm-next	2021-01-07 18:06:52 -05:00
kernel	Merge branch 'kvm-master' into kvm-next	2021-01-07 18:06:52 -05:00
kvm	KVM: x86/mmu: Ensure TDP MMU roots are freed after yield	2021-01-07 18:11:31 -05:00
lib	x86/insn-eval: Use new for_each_insn_prefix() macro to loop over prefixes bytes	2020-12-06 10:03:08 +01:00
math-emu	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
mm	x86/mm/mem_encrypt: Fix definition of PMD_FLAGS_DEC_WP	2020-12-10 12:28:06 +01:00
net	bpf: x64: Do not emit sub/add 0, %rsp when !stack_depth	2020-09-29 16:47:39 -07:00
oprofile
pci	pci-v5.10-changes	2020-10-22 12:41:00 -07:00
platform	efi/x86: Free efi_pgd with free_pages()	2020-11-10 19:18:11 +01:00
power	Kbuild updates for v5.9	2020-08-09 14:10:26 -07:00
purgatory	treewide: Convert macro and uses of __section(foo) to __section("foo")	2020-10-25 14:51:49 -07:00
ras	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
realmode	x86/head/64: Don't call verify_cpu() on starting APs	2020-09-09 11:33:20 +02:00
tools	x86/insn: Make inat-tables.c suitable for pre-decompression code	2020-09-07 19:45:24 +02:00
um	arch/um: partially revert the conversion to __section() macro	2020-10-26 15:39:37 -07:00
video
xen	xen: branch for v5.10-rc5	2020-11-20 10:30:48 -08:00
.gitignore
Kbuild
Kconfig	kbuild: Hoist '--orphan-handling' into Kconfig	2020-12-01 22:45:36 +09:00
Kconfig.assembler
Kconfig.cpu	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Kconfig.debug	x86, powerpc: Rename memcpy_mcsafe() to copy_mc_to_{user, kernel}()	2020-10-06 11:18:04 +02:00
Makefile	kbuild: Hoist '--orphan-handling' into Kconfig	2020-12-01 22:45:36 +09:00
Makefile_32.cpu
Makefile.um