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Peter Zijlstra 28a99e95f5 x86/amd: Use IBPB for firmware calls 
On AMD IBRS does not prevent Retbleed; as such use IBPB before a
firmware call to flush the branch history state.

And because in order to do an EFI call, the kernel maps a whole lot of
the kernel page table into the EFI page table, do an IBPB just in case
in order to prevent the scenario of poisoning the BTB and causing an EFI
call using the unprotected RET there.

  [ bp: Massage. ]

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Signed-off-by: Borislav Petkov <bp@suse.de>
Link: https://lore.kernel.org/r/20220715194550.793957-1-cascardo@canonical.com
2022-07-18 15:38:09 +02:00
..
boot x86/compressed/64: Add identity mappings for setup_data entries 2022-07-06 11:23:39 +02:00
coco x86/tdx: Handle load_unaligned_zeropad() page-cross to a shared page 2022-06-17 15:37:33 -07:00
configs x86/config: Make the x86 defconfigs a bit more usable 2022-03-27 20:58:35 +02:00
crypto crypto: x86 - eliminate anonymous module_init & module_exit 2022-04-08 16:13:31 +08:00
entry x86/entry: Remove UNTRAIN_RET from native_irq_return_ldt 2022-07-14 09:45:12 +02:00
events Two small perf updates: 2022-06-05 10:40:31 -07:00
hyperv x86/Hyper-V: Add SEV negotiate protocol support in Isolation VM 2022-06-15 18:27:40 +00:00
ia32 x86: Remove a.out support 2022-04-11 18:04:27 +02:00
include x86/amd: Use IBPB for firmware calls 2022-07-18 15:38:09 +02:00
kernel x86/amd: Use IBPB for firmware calls 2022-07-18 15:38:09 +02:00
kvm KVM: emulate: do not adjust size of fastop and setcc subroutines 2022-07-15 07:49:40 -04:00
lib x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
math-emu x86/32: Remove lazy GS macros 2022-04-14 14:09:43 +02:00
mm x86/pat: Fix x86_has_pat_wp() 2022-07-13 12:44:04 +02:00
net x86/bpf: Use alternative RET encoding 2022-06-27 10:33:58 +02:00
pci x86/PCI: Revert "x86/PCI: Clip only host bridge windows for E820 regions" 2022-06-17 14:24:14 -05:00
platform efi/x86: use naked RET on mixed mode call wrapper 2022-07-16 09:51:24 -07:00
power x86/cpu: Load microcode during restore_processor_state() 2022-04-19 19:37:05 +02:00
purgatory x86/purgatory: Remove -nostdlib compiler flag 2021-12-30 14:13:06 +01:00
ras treewide: replace '---help---' in Kconfig files with 'help' 2020-06-14 01:57:21 +09:00
realmode Intel Trust Domain Extensions 2022-05-23 17:51:12 -07:00
tools x86/build: Use the proper name CONFIG_FW_LOADER 2021-12-29 22:20:38 +01:00
um um: Fix out-of-bounds read in LDT setup 2022-05-27 09:03:41 +02:00
video
virt/vmx/tdx x86/tdx: Provide common base for SEAMCALL and TDCALL C wrappers 2022-04-07 08:27:50 -07:00
xen Just when you thought that all the speculation bugs were addressed and 2022-07-11 18:15:25 -07:00
.gitignore .gitignore: add SPDX License Identifier 2020-03-25 11:50:48 +01:00
Kbuild x86/cc: Move arch/x86/{kernel/cc_platform.c => coco/core.c} 2022-02-23 18:25:58 +01:00
Kconfig x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
Kconfig.assembler x86/delay: Introduce TPAUSE delay 2020-05-07 16:06:20 +02:00
Kconfig.cpu x86/mmx_32: Remove X86_USE_3DNOW 2021-12-11 09:09:45 +01:00
Kconfig.debug x86/Kconfig: Fix indentation of arch/x86/Kconfig.debug 2022-05-25 15:39:27 +02:00
Makefile x86/retbleed: Add fine grained Kconfig knobs 2022-06-29 17:43:41 +02:00
Makefile.um um: allow not setting extra rpaths in the linux binary 2021-06-17 21:54:15 +02:00
Makefile_32.cpu x86/build: Do not add -falign flags unconditionally for clang 2021-09-19 10:35:53 +09:00