tree 1b1a614741d991ab9b3396fda10656891c5310ae
parent 4143fbfd524b140b81122286c3984bd1aaac82b7
author Sean Christopherson <seanjc@google.com> 1654732352 +0000
committer Sean Christopherson <seanjc@google.com> 1658780429 -0700

x86: Use "safe" helpers to implement unsafe CRs accessors

Use the "safe" helpers to read and write CR0, CR3, and CR4, so that an
unexpected fault results in a detailed message instead of an generic
"unexpected fault" explosion.

Do not give RDMSR/WRMSR the same treatment.  KUT's exception fixup uses
per-CPU data and thus needs a stable GS.base.  Various tests modify
MSR_GS_BASE and routing them through the safe variants will cause
fireworks when trying to clear/read the exception vector with a garbage
GS.base.

Signed-off-by: Sean Christopherson <seanjc@google.com>
Link: https://lore.kernel.org/r/20220608235238.3881916-5-seanjc@google.com