Kyle Huey d2602da3da x86/fpu: Emulate XRSTOR's behavior if the xfeatures PKRU bit is not set ... commit d7e5aceace upstream. The hardware XRSTOR instruction resets the PKRU register to its hardware init value (namely 0) if the PKRU bit is not set in the xfeatures mask. Emulating that here restores the pre-5.14 behavior for PTRACE_SET_REGSET with NT_X86_XSTATE, and makes sigreturn (which still uses XRSTOR) and ptrace behave identically. KVM has never used XRSTOR and never had this behavior, so KVM opts-out of this emulation by passing a NULL pkru pointer to copy_uabi_to_xstate(). Fixes: e84ba47e31 ("x86/fpu: Hook up PKRU into ptrace()") Signed-off-by: Kyle Huey <me@kylehuey.com> Signed-off-by: Dave Hansen <dave.hansen@linux.intel.com> Link: https://lore.kernel.org/all/20221115230932.7126-6-khuey%40kylehuey.com Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>		2023-01-14 10:33:42 +01:00
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alpha	alpha: fix syscall entry in !AUDUT_SYSCALL case	2022-12-31 13:31:55 +01:00
arc	…
arm	ARM: renumber bits related to _TIF_WORK_MASK	2023-01-12 12:01:55 +01:00
arm64	arm64: dts: mediatek: mt8195-demo: fix the memory size of node secmon	2023-01-07 11:11:49 +01:00
csky	…
hexagon	…
ia64	…
loongarch	LoongArch: mm: Fix huge page entry update for virtual machine	2022-12-08 14:59:15 +08:00
m68k	…
microblaze	…
mips	of/fdt: run soc memory setup when early_init_dt_scan_memory fails	2023-01-12 12:02:51 +01:00
nios2	…
openrisc	…
parisc	parisc: Align parisc MADV_XXX constants with all other architectures	2023-01-14 10:33:40 +01:00
powerpc	powerpc/ftrace: fix syscall tracing on PPC64_ELF_ABI_V1	2023-01-07 11:11:48 +01:00
riscv	riscv, kprobes: Stricter c.jr/c.jalr decoding	2023-01-12 12:02:51 +01:00
s390	* Document the interaction between KVM_CAP_HALT_POLL and halt_poll_ns	2022-12-06 10:49:19 -08:00
sh	…
sparc	…
um	um: virt-pci: Avoid GCC non-NULL warning	2023-01-07 11:11:52 +01:00
x86	x86/fpu: Emulate XRSTOR's behavior if the xfeatures PKRU bit is not set	2023-01-14 10:33:42 +01:00
xtensa	xtensa: add __umulsidi3 helper	2023-01-07 11:11:46 +01:00
.gitignore	…
Kconfig	ftrace: Allow WITH_ARGS flavour of graph tracer with shadow call stack	2022-12-31 13:32:45 +01:00