[PATCH 6.2 0/5] KVM CR0.WP series backport

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This is a backport of the CR0.WP KVM series[1] to Linux v6.2. All
commits applied either clean or with only minor changes needed to
account for missing prerequisite patches, e.g. the lack of a
kvm_is_cr0_bit_set() helper for patch 5 or the slightly different
surrounding context in patch 4 (__always_inline vs. plain inline for
to_kvm_vmx()).

I used 'ssdd 10 50000' from rt-tests[2] as a micro-benchmark, running on
a grsecurity L1 VM. Below table shows the results (runtime in seconds,
lower is better):

                        legacy     TDP    shadow
    Linux v6.2.10        7.61s    7.98s    68.6s
    + patches            3.37s    3.41s    70.2s

The KVM unit test suite showed no regressions.

Please consider applying.

Thanks,
Mathias

[1] https://lore.kernel.org/kvm/20230322013731.102955-1-minipli@xxxxxxxxxxxxxx/
[2] https://git.kernel.org/pub/scm/utils/rt-tests/rt-tests.git


Mathias Krause (3):
  KVM: x86: Do not unload MMU roots when only toggling CR0.WP with TDP
    enabled
  KVM: x86: Make use of kvm_read_cr*_bits() when testing bits
  KVM: VMX: Make CR0.WP a guest owned bit

Paolo Bonzini (1):
  KVM: x86/mmu: Avoid indirect call for get_cr3

Sean Christopherson (1):
  KVM: x86/mmu: Refresh CR0.WP prior to checking for emulated permission
    faults

 arch/x86/kvm/kvm_cache_regs.h  |  2 +-
 arch/x86/kvm/mmu.h             | 26 ++++++++++++++++++-
 arch/x86/kvm/mmu/mmu.c         | 46 ++++++++++++++++++++++++++--------
 arch/x86/kvm/mmu/paging_tmpl.h |  2 +-
 arch/x86/kvm/pmu.c             |  4 +--
 arch/x86/kvm/vmx/nested.c      |  4 +--
 arch/x86/kvm/vmx/vmx.c         |  6 ++---
 arch/x86/kvm/vmx/vmx.h         | 18 +++++++++++++
 arch/x86/kvm/x86.c             | 12 +++++++++
 9 files changed, 99 insertions(+), 21 deletions(-)

-- 
2.39.2




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