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Sean Christopherson 05487215e6 KVM: x86: Don't attempt to load PDPTRs when 64-bit mode is enabled 
Don't attempt to load PDPTRs if EFER.LME=1, i.e. if 64-bit mode is
enabled.  A recent change to reload the PDTPRs when CR0.CD or CR0.NW is
toggled botched the EFER.LME handling and sends KVM down the PDTPR path
when is_paging() is true, i.e. when the guest toggles CD/NW in 64-bit
mode.

Split the CR0 checks for 64-bit vs. 32-bit PAE into separate paths.  The
64-bit path is specifically checking state when paging is toggled on,
i.e. CR0.PG transititions from 0->1.  The PDPTR path now needs to run if
the new CR0 state has paging enabled, irrespective of whether paging was
already enabled.  Trying to shave a few cycles to make the PDPTR path an
"else if" case is a mess.

Fixes: d42e3fae6f ("kvm: x86: Read PDPTEs on CR0.CD and CR0.NW changes")
Cc: Jim Mattson <jmattson@google.com>
Cc: Oliver Upton <oupton@google.com>
Cc: Peter Shier <pshier@google.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Reviewed-by: Jim Mattson <jmattson@google.com>
Reviewed-by: Maxim Levitsky <mlevitsk@redhat.com>
Message-Id: <20200714015732.32426-1-sean.j.christopherson@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
2020-08-09 12:51:50 -04:00
..
boot x86: Add support for ZSTD compressed kernel 2020-07-31 11:49:09 +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 Merge git://git.kernel.org/pub/scm/linux/kernel/git/netdev/net-next 2020-08-05 20:13:21 -07:00
events Misc cleanups all around the place. 2020-08-03 16:53:28 -07:00
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 Merge branch 'work.fdpic' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 13:29:39 -07:00
kernel Tracing updates for 5.9 2020-08-07 18:29:15 -07:00
kvm KVM: x86: Don't attempt to load PDPTRs when 64-bit mode is enabled 2020-08-09 12:51:50 -04:00
lib * AMD Memory bandwidth counter width fix, by Babu Moger. 2020-06-28 10:35:01 -07:00
math-emu Merge branch 'work.regset' of git://git.kernel.org/pub/scm/linux/kernel/git/viro/vfs 2020-08-07 09:29:25 -07:00
mm Merge branch 'akpm' (patches from Andrew) 2020-08-07 11:39:33 -07:00
net
oprofile
pci pci-v5.9-changes 2020-08-07 18:48:15 -07:00
platform mm: remove unneeded includes of <asm/pgalloc.h> 2020-08-07 11:33:26 -07:00
power mm, treewide: rename kzfree() to kfree_sensitive() 2020-08-07 11:33:22 -07:00
purgatory x86/purgatory: Add -fno-stack-protector 2020-06-16 17:05:07 -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
video
xen s390: implement diag318 2020-08-06 12:59:31 -07:00
.gitignore
Kbuild
Kconfig s390: implement diag318 2020-08-06 12:59:31 -07:00
Kconfig.assembler
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 x86/build: Move max-page-size option to LDFLAGS_vmlinux 2020-07-24 16:39:27 +02:00
Makefile.um
Makefile_32.cpu