Tom Lendacky 6f0f2d5ef8 KVM: x86: Mitigate the cross-thread return address predictions bug ...

By default, KVM/SVM will intercept attempts by the guest to transition
out of C0. However, the KVM_CAP_X86_DISABLE_EXITS capability can be used
by a VMM to change this behavior. To mitigate the cross-thread return
address predictions bug (X86_BUG_SMT_RSB), a VMM must not be allowed to
override the default behavior to intercept C0 transitions.

Use a module parameter to control the mitigation on processors that are
vulnerable to X86_BUG_SMT_RSB. If the processor is vulnerable to the
X86_BUG_SMT_RSB bug and the module parameter is set to mitigate the bug,
KVM will not allow the disabling of the HLT, MWAIT and CSTATE exits.

Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
Message-Id: <4019348b5e07148eb4d593380a5f6713b93c9a16.1675956146.git.thomas.lendacky@amd.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

2023-02-10 07:27:37 -05:00

..

alpha

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

arc

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

arm

ARM fixes for 6.2

2023-01-27 12:49:00 -08:00

arm64

ARM64:

2023-01-24 17:48:09 -08:00

csky

arch/csky patches for 6.2-rc1

2022-12-19 07:51:30 -06:00

hexagon

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

ia64

elfcore: Add a cprm parameter to elf_core_extra_{phdrs,data_size}

2023-01-05 15:12:12 +00:00

loongarch

LoongArch: Add generic ex-handler unwind in prologue unwinder

2023-01-17 11:42:16 +08:00

m68k

m68k: remove broken strcmp implementation

2022-12-21 08:56:43 -08:00

microblaze

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

mips

of/fdt: run soc memory setup when early_init_dt_scan_memory fails

2023-01-03 18:41:01 -06:00

nios2

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

openrisc

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

parisc

parisc architecture fixes for kernel v6.2-rc1:

2022-12-20 08:43:53 -06:00

powerpc

powerpc fixes for 6.2 #3

2023-01-15 07:09:41 -06:00

riscv

RISC-V Fixes for 6.2-rc6

2023-01-27 12:52:45 -08:00

s390

s390: workaround invalid gcc-11 out of bounds read warning

2023-01-17 19:00:59 +01:00

sh

sh/mm: Fix pmd_t for real

2023-01-10 05:31:42 -06:00

sparc

MM patches for 6.2-rc1.

2022-12-13 19:29:45 -08:00

um

New Feature:

2022-12-17 14:06:53 -06:00

x86

KVM: x86: Mitigate the cross-thread return address predictions bug

2023-02-10 07:27:37 -05:00

xtensa

xtensa: drop unused members of struct thread_struct

2023-01-06 23:33:11 -08:00

.gitignore

…

Kconfig

arm64 fixes for -rc1

2022-12-16 13:46:41 -06:00