[PATCH v2 0/8] x86/sev-es: Fixes for SEV-ES Guest Support

From: Joerg Roedel
Date: Wed May 19 2021 - 09:53:23 EST

From: Joerg Roedel <jroedel@xxxxxxx>


here is the second version of my pending SEV-ES fixes. The most
important patches are patch 1 to 5, as they fix warnings and splats
that trigger with various debugging options are enabled.

Patches 6 to 8 fix a correctness issue in the instruction emulation
part of the #VC exception handler.

Please review.



Link to v1: https://lore.kernel.org/lkml/20210512075445.18935-1-joro@xxxxxxxxxx/

Changes since v1:

- Documented why __get_user()/__put_user() are safe to use in
the #VC handlers memory access path.

- Merged the revert into patch 3

- Refactored code in the instruction decoder and added #GP
reporting when getting the instructions linear address fails.

Joerg Roedel (8):
x86/sev-es: Don't return NULL from sev_es_get_ghcb()
x86/sev-es: Forward page-faults which happen during emulation
x86/sev-es: Use __put_user()/__get_user() for data accesses
x86/sev-es: Fix error message in runtime #VC handler
x86/sev-es: Leave NMI-mode before sending signals
x86/insn-eval: Make 0 a valid RIP for insn_get_effective_ip()
x86/insn: Extend error reporting from
x86/sev-es: Propagate #GP if getting linear instruction address failed

arch/x86/include/asm/insn-eval.h | 6 +-
arch/x86/kernel/sev.c | 127 +++++++++++++++++++++----------
arch/x86/kernel/umip.c | 10 +--
arch/x86/lib/insn-eval.c | 52 ++++++++-----
4 files changed, 129 insertions(+), 66 deletions(-)

base-commit: a50c5bebc99c525e7fbc059988c6a5ab8680cb76