Thomas Gleixner 7aa5128b5f x86/fpu/xsave: Handle compacted offsets correctly with supervisor states ... So far the cached fixed compacted offsets worked, but with (re-)enabling of ENQCMD this does no longer work with KVM fpstate. KVM does not have supervisor features enabled for the guest FPU, which means that KVM has then a different XSAVE area layout than the host FPU state. This in turn breaks the copy from/to UABI functions when invoked for a guest state. Remove the pre-calculated compacted offsets and calculate the offset of each component at runtime based on the XCOMP_BV field in the XSAVE header. The runtime overhead is not interesting because these copy from/to UABI functions are not used in critical fast paths. KVM uses them to save and restore FPU state during migration. The host uses them for ptrace and for the slow path of 32bit signal handling. Fixes: 7c1ef59145 ("x86/cpufeatures: Re-enable ENQCMD") Signed-off-by: Thomas Gleixner <tglx@linutronix.de> Signed-off-by: Borislav Petkov <bp@suse.de> Link: https://lore.kernel.org/r/20220324134623.627636809@linutronix.de		2022-03-30 11:20:36 +02:00
..
bugs.c	x86/fpu: Replace the includes of fpu/internal.h	2021-10-20 15:27:29 +02:00
context.h	x86/fpu: Update XFD state where required	2021-10-26 10:53:02 +02:00
core.c	x86/fpu: Remove redundant XCOMP_BV initialization	2022-03-29 20:57:18 +02:00
init.c	x86/fpu: Add fpu_state_config::legacy_features	2021-10-26 10:18:09 +02:00
internal.h	x86/fpu/signal: Prepare for variable sigframe length	2021-10-26 10:18:09 +02:00
legacy.h	x86/fpu: Remove .fixup usage	2021-12-11 09:09:48 +01:00
Makefile	treewide: Add SPDX license identifier - Makefile/Kconfig	2019-05-21 10:50:46 +02:00
regset.c	x86/ptrace: Fix xfpregs_set()'s incorrect xmm clearing	2022-02-18 11:23:21 +01:00
signal.c	x86/fpu/signal: Initialize sw_bytes in save_xstate_epilog()	2021-11-30 15:13:47 -08:00
xstate.c	x86/fpu/xsave: Handle compacted offsets correctly with supervisor states	2022-03-30 11:20:36 +02:00
xstate.h	RISCV:	2022-01-16 16:15:14 +02:00