Lai Jiangshan 6e1d849fa3 KVM: x86: Intercept LA57 to inject #GP fault when it's reserved ... Unconditionally intercept changes to CR4.LA57 so that KVM correctly injects a #GP fault if the guest attempts to set CR4.LA57 when it's supported in hardware but not exposed to the guest. Long term, KVM needs to properly handle CR4 bits that can be under guest control but also may be reserved from the guest's perspective. But, KVM currently sets the CR4 guest/host mask only during vCPU creation, and reworking flows to change that will take a bit of elbow grease. Even if/when generic support for intercepting reserved bits exists, it's probably not worth letting the guest set CR4.LA57 directly. LA57 can't be toggled while long mode is enabled, thus it's all but guaranteed to be set once (maybe twice, e.g. by BIOS and kernel) during boot and never touched again. On the flip side, letting the guest own CR4.LA57 may incur extra VMREADs. In other words, this temporary "hack" is probably also the right long term fix. Fixes: fd8cb43373 ("KVM: MMU: Expose the LA57 feature to VM.") Cc: stable@vger.kernel.org Cc: Lai Jiangshan <jiangshanlai@gmail.com> Signed-off-by: Lai Jiangshan <laijs@linux.alibaba.com> [sean: rewrote changelog] Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com> Message-Id: <20200930041659.28181-2-sean.j.christopherson@intel.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>		2020-10-21 17:48:49 -04:00
..
boot	Merge 'x86/kaslr' to pick up dependent bits	2020-09-07 18:09:43 +02:00
configs	x86/defconfigs: Refresh defconfig files	2020-07-25 12:02:14 +02:00
crypto	crypto: x86/curve25519 - Remove unused carry variables	2020-07-31 18:25:29 +10:00
entry	x86/entry: Unbreak 32bit fast syscall	2020-09-04 15:50:14 +02:00
events	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
hyperv	vmalloc: fix the owner argument for the new __vmalloc_node_range callers	2020-07-03 16:15:25 -07:00
ia32	mm: remove unneeded includes of <asm/pgalloc.h>	2020-08-07 11:33:26 -07:00
include	KVM: x86: allow kvm_x86_ops.set_efer to return an error value	2020-10-21 17:48:48 -04:00
kernel	cpuidle-haltpoll: fix error comments in arch_haltpoll_disable	2020-09-28 07:57:28 -04:00
kvm	KVM: x86: Intercept LA57 to inject #GP fault when it's reserved	2020-10-21 17:48:49 -04:00
lib	x86/cmdline: Disable jump tables for cmdline.c	2020-09-03 10:59:16 +02:00
math-emu	treewide: Use fallthrough pseudo-keyword	2020-08-23 17:36:59 -05:00
mm	x86/kvm: Update the comment about asynchronous page fault in exc_page_fault()	2020-10-21 17:36:31 -04:00
net	bpf, i386: Remove unneeded conversion to bool	2020-05-07 16:29:14 +02:00
oprofile
pci	xen: branch for v5.9-rc2	2020-08-21 12:28:33 -07:00
platform	efi/x86: Move 32-bit code into efi_32.c	2020-08-20 11:18:36 +02:00
power	Kbuild updates for v5.9	2020-08-09 14:10:26 -07:00
purgatory	Misc fixes and small updates all around the place:	2020-08-15 10:38:03 -07:00
ras	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
realmode	Rebase locking/kcsan to locking/urgent	2020-06-11 20:02:46 +02:00
tools
um	kbuild: remove cc-option test of -fno-stack-protector	2020-07-07 11:13:10 +09:00
video
xen	xen: branch for v5.9-rc1b	2020-08-14 13:34:37 -07:00
.gitignore
Kbuild
Kconfig	A set of posix CPU timer changes which allows to defer the heavy work of	2020-08-14 14:17:51 -07:00
Kconfig.assembler	x86/delay: Introduce TPAUSE delay	2020-05-07 16:06:20 +02:00
Kconfig.cpu	treewide: replace '---help---' in Kconfig files with 'help'	2020-06-14 01:57:21 +09:00
Kconfig.debug	locking/lockdep: Fix TRACE_IRQFLAGS vs. NMIs	2020-07-27 15:13:29 +02:00
Makefile	Kbuild updates for v5.9	2020-08-09 14:10:26 -07:00
Makefile_32.cpu
Makefile.um