Paul Mackerras ae49dedaa9 KVM: PPC: Book3S HV: Handle non-present PTEs in page fault functions ... Since cd758a9b57 "KVM: PPC: Book3S HV: Use __gfn_to_pfn_memslot in HPT page fault handler", it's been possible in fairly rare circumstances to load a non-present PTE in kvmppc_book3s_hv_page_fault() when running a guest on a POWER8 host. Because that case wasn't checked for, we could misinterpret the non-present PTE as being a cache-inhibited PTE. That could mismatch with the corresponding hash PTE, which would cause the function to fail with -EFAULT a little further down. That would propagate up to the KVM_RUN ioctl() generally causing the KVM userspace (usually qemu) to fall over. This addresses the problem by catching that case and returning to the guest instead. For completeness, this fixes the radix page fault handler in the same way. For radix this didn't cause any obvious misbehaviour, because we ended up putting the non-present PTE into the guest's partition-scoped page tables, leading immediately to another hypervisor data/instruction storage interrupt, which would go through the page fault path again and fix things up. Fixes: cd758a9b57 "KVM: PPC: Book3S HV: Use __gfn_to_pfn_memslot in HPT page fault handler" Bugzilla: https://bugzilla.redhat.com/show_bug.cgi?id=1820402 Reported-by: David Gibson <david@gibson.dropbear.id.au> Tested-by: David Gibson <david@gibson.dropbear.id.au> Signed-off-by: Paul Mackerras <paulus@ozlabs.org>		2020-04-21 09:23:41 +10:00
..
boot	Kbuild updates for v5.6 (2nd)	2020-02-09 16:05:50 -08:00
configs	virtio: fixes, cleanups	2020-02-07 12:26:34 -08:00
crypto	crypto: remove CRYPTO_TFM_RES_BAD_KEY_LEN	2020-01-09 11:30:53 +08:00
include	ARM:	2020-04-02 15:13:15 -07:00
kernel	bpf: Support llvm-objcopy for vmlinux BTF	2020-03-19 12:32:38 +01:00
kexec	powerpc: Replace cpu_up/down() with add/remove_cpu()	2020-03-25 12:59:35 +01:00
kvm	KVM: PPC: Book3S HV: Handle non-present PTEs in page fault functions	2020-04-21 09:23:41 +10:00
lib	powerpc: Fix __clear_user() with KUAP enabled	2019-12-16 23:19:44 +11:00
math-emu	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 152	2019-05-30 11:26:32 -07:00
mm	mm: allow VM_FAULT_RETRY for multiple times	2020-04-02 09:35:30 -07:00
net	treewide: Use sizeof_field() macro	2019-12-09 10:36:44 -08:00
oprofile	powerpc updates for 5.6	2020-02-04 13:06:46 +00:00
perf	perf/core: Add new branch sample type for HW index of raw branch records	2020-02-11 13:23:49 +01:00
platforms	mm/sparse: rename pfn_present() to pfn_in_present_section()	2020-04-02 09:35:30 -07:00
purgatory	treewide: Replace GPLv2 boilerplate/reference with SPDX - rule 441	2019-06-05 17:37:17 +02:00
sysdev	powerpc updates for 5.6	2020-02-04 13:06:46 +00:00
tools	powerpc: Do not consider weak unresolved symbol relocations as bad	2020-01-31 20:17:22 +11:00
xmon	powerpc/xmon: Fix whitespace handling in getstring()	2020-02-18 21:31:12 +11:00
Kbuild	powerpc/kexec: Move kexec files into a dedicated subdir.	2019-11-21 15:41:34 +11:00
Kconfig	Merge branch 'next-integrity' of git://git.kernel.org/pub/scm/linux/kernel/git/zohar/linux-integrity	2020-04-02 14:49:46 -07:00
Kconfig.debug	powerpc/ptdump: Only enable PPC_CHECK_WX with STRICT_KERNEL_RWX	2020-01-23 21:31:13 +11:00
Makefile	powerpc: Don't add -mabi= flags when building with Clang	2019-11-25 21:45:43 +11:00
Makefile.postlink	powerpc: Do not consider weak unresolved symbol relocations as bad	2020-01-31 20:17:22 +11:00