linux/arch/x86
Sean Christopherson 023cfa6fc2 KVM: VMX: Use proper accessor to read guest CR4 in handle_desc()
Use kvm_is_cr4_bit_set() to read guest CR4.UMIP when sanity checking that
a descriptor table VM-Exit occurs if and only if guest.CR4.UMIP=1.  UMIP
can't be guest-owned, i.e. using kvm_read_cr4_bits() to decache guest-
owned bits isn't strictly necessary, but eliminating raw reads of
vcpu->arch.cr4 is desirable as it makes it easy to visually audit KVM for
correctness.

Opportunistically add a compile-time assertion that UMIP isn't guest-owned
as letting the guest own UMIP isn't compatible with emulation (or any CR4
bit that is emulated by KVM).

Opportunistically change the WARN_ON() to a ONCE variant.  When the WARN
fires, it fires _a lot_, and spamming the kernel logs ends up doing more
harm than whatever led to KVM's unnecessary emulation.

Reported-by: Robert Hoo <robert.hu@intel.com>
Link: https://lore.kernel.org/all/20230310125718.1442088-4-robert.hu@intel.com
Link: https://lore.kernel.org/r/20230413231914.1482782-3-seanjc@google.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
2023-05-26 13:50:42 -07:00
..
boot * Do conditional __tdx_hypercall() 'output' processing via an 2023-04-28 09:36:09 -07:00
coco * Do conditional __tdx_hypercall() 'output' processing via an 2023-04-28 09:36:09 -07:00
configs x86/defconfig: Enable CONFIG_DEBUG_WX=y 2022-09-02 10:41:42 +02:00
crypto modules-6.4-rc1 2023-04-27 16:36:55 -07:00
entry Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
events perf/x86/intel/ds: Flush PEBS DS when changing PEBS_DATA_CFG 2023-05-08 10:58:27 +02:00
hyperv Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
ia32 x86/signal/32: Merge native and compat 32-bit signal code 2022-10-19 09:58:49 +02:00
include KVM: VMX: Fix header file dependency of asm/vmx.h 2023-05-19 13:56:25 -04:00
kernel x86/amd_nb: Add PCI ID for family 19h model 78h 2023-05-08 11:25:19 +02:00
kvm KVM: VMX: Use proper accessor to read guest CR4 in handle_desc() 2023-05-26 13:50:42 -07:00
lib x86/retbleed: Fix return thunk alignment 2023-05-12 17:19:53 -05:00
math-emu
mm x86-64: mm: clarify the 'positive addresses' user address rules 2023-05-03 10:37:22 -07:00
net bpf, x86: Simplify the parsing logic of structure parameters 2023-01-10 15:53:22 -08:00
pci pci-v6.4-changes 2023-04-27 10:45:30 -07:00
platform Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
power x86/cpu: Mark {hlt,resume}_play_dead() __noreturn 2023-04-14 17:31:27 +02:00
purgatory purgatory: fix disabling debug info 2023-04-08 19:36:53 +09:00
ras
realmode x86/boot: Skip realmode init code when running as Xen PV guest 2022-11-25 12:05:22 +01:00
tools ELF: fix all "Elf" typos 2023-04-08 13:45:37 -07:00
um um: make stub data pages size tweakable 2023-04-20 23:08:43 +02:00
video
virt/vmx/tdx
xen Objtool changes for v6.4: 2023-04-28 14:02:54 -07:00
.gitignore x86/purgatory: Omit use of bin2c 2022-07-25 10:32:32 +02:00
Kbuild
Kconfig Add support for new Linear Address Masking CPU feature. This is similar 2023-04-28 09:43:49 -07:00
Kconfig.assembler crypto: x86/aria-avx - fix build failure with old binutils 2023-01-20 18:29:31 +08:00
Kconfig.cpu
Kconfig.debug docs: move x86 documentation into Documentation/arch/ 2023-03-30 12:58:51 -06:00
Makefile x86/build: Make 64-bit defconfig the default 2023-02-15 14:20:17 +01:00
Makefile_32.cpu
Makefile.um um: Only disable SSE on clang to work around old GCC bugs 2023-04-04 09:57:05 +02:00