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Zenghui Yu fd66dcfbc9 KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace 
commit 23bde34771f1ea92fb5e6682c0d8c04304d34b3b upstream.

It was recently reported that if GICR_TYPER is accessed before the RD base
address is set, we'll suffer from the unset @rdreg dereferencing. Oops...

	gpa_t last_rdist_typer = rdreg->base + GICR_TYPER +
			(rdreg->free_index - 1) * KVM_VGIC_V3_REDIST_SIZE;

It's "expected" that users will access registers in the redistributor if
the RD has been properly configured (e.g., the RD base address is set). But
it hasn't yet been covered by the existing documentation.

Per discussion on the list [1], the reporting of the GICR_TYPER.Last bit
for userspace never actually worked. And it's difficult for us to emulate
it correctly given that userspace has the flexibility to access it any
time. Let's just drop the reporting of the Last bit for userspace for now
(userspace should have full knowledge about it anyway) and it at least
prevents kernel from panic ;-)

[1] https://lore.kernel.org/kvmarm/c20865a267e44d1e2c0d52ce4e012263@kernel.org/

Fixes: ba7b3f1275fd ("KVM: arm/arm64: Revisit Redistributor TYPER last bit computation")
Reported-by: Keqian Zhu <zhukeqian1@huawei.com>
Signed-off-by: Zenghui Yu <yuzenghui@huawei.com>
Signed-off-by: Marc Zyngier <maz@kernel.org>
Reviewed-by: Eric Auger <eric.auger@redhat.com>
Link: https://lore.kernel.org/r/20201117151629.1738-1-yuzenghui@huawei.com
Cc: stable@vger.kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
 		2021-03-16 16:41:35 +08:00
Documentation xtensa: fix TLBTEMP area placement 2021-03-16 16:41:29 +08:00
LICENSES Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
arch KVM: PPC: Book3S HV: XIVE: Fix possible oops when accessing ESB page 2021-03-16 16:41:35 +08:00
block blk-cgroup: Pre-allocate tree node on blkg_conf_prep 2021-03-16 16:40:25 +08:00
certs Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
crypto crypto: algif_skcipher - EBUSY on aio should be an error 2021-03-16 16:38:24 +08:00
drivers spi: bcm2835: Fix use-after-free on unbind 2021-03-16 16:41:33 +08:00
fs cifs: fix a memleak with modefromsid 2021-03-16 16:41:35 +08:00
include wireless: Use linux/stddef.h instead of stddef.h 2021-03-16 16:41:34 +08:00
init printk: reduce LOG_BUF_SHIFT range for H8300 2021-03-16 16:39:45 +08:00
ipc ipc/util.c: sysvipc_find_ipc() incorrectly updates position index 2021-03-16 16:27:51 +08:00
kernel sched/fair: Fix overutilized update in enqueue_task_fair() 2021-03-16 16:41:33 +08:00
lib random32: make prandom_u32() output unpredictable 2021-03-16 16:40:40 +08:00
mm mm, page_alloc: skip ->waternark_boost for atomic order-0 allocations 2021-03-16 16:41:33 +08:00
net ipv4: use IS_ENABLED instead of ifdef 2021-03-16 16:41:33 +08:00
package config/arm64: OPEN CONFIG_PSI and phytium configs 2021-03-16 11:02:59 +08:00
samples samples/bpf: Fix possible deadlock in xdpsock 2021-03-16 16:39:46 +08:00
scripts scripts/setlocalversion: make git describe output more reliable 2021-03-16 16:39:28 +08:00
security selinux: Fix error return code in sel_ib_pkey_sid_slow() 2021-03-16 16:40:55 +08:00
sound ALSA: hda/realtek: Add some Clove SSID in the ALC293(ALC1220) 2021-03-16 16:41:26 +08:00
tools selftests/bpf: Fix error return code in run_getsockopt_test() 2021-03-16 16:41:20 +08:00
usr Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
virt KVM: arm64: vgic-v3: Drop the reporting of GICR_TYPER.Last for userspace 2021-03-16 16:41:35 +08:00
.clang-format Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.cocciconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.get_maintainer.ignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitattributes Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
.gitignore Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
COPYING Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
CREDITS Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kbuild Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
Kconfig Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
MAINTAINERS Documentation/llvm: add documentation on building w/ Clang/LLVM 2021-03-16 16:34:24 +08:00
Makefile kbuild: fix broken builds because of GZIP,BZIP2,LZOP variables 2021-03-16 16:35:20 +08:00
README Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
README.md Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
backport_remove_lists.txt Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00
tools_key.pub Init Repo base on linux 5.4.32 long term, and add base tlinux kernel interfaces. 2021-03-16 11:01:34 +08:00

README.md

Tencent Linux Kernel 4.0