[PATCH 5.10 00/10] KVM CR0.WP series backport

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This is a backport of the CR0.WP KVM series[1] to Linux v5.10. It
further extends the v5.15 backport by two patches, namely patch 5 (which
is the prerequisite for Lai's patches) and patch 8 which was already
part of the v5.15.27 stable update but didn't made it to v5.10.

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 v5.10.177       10.37s    88.7s    69.7s
    + patches              4.88s     4.92s   70.1s

TDP MMU is, as for v5.15, slower than shadow paging on a vanilla kernel.
Fortunately it's disabled by default.

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


Lai Jiangshan (4):
  KVM: X86: Don't reset mmu context when X86_CR4_PCIDE 1->0
  KVM: X86: Don't reset mmu context when toggling X86_CR4_PGE
  KVM: X86: Ensure that dirty PDPTRs are loaded
  KVM: x86/mmu: Reconstruct shadow page root if the guest PDPTEs is
    changed

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 (2):
  KVM: x86: Read and pass all CR0/CR4 role bits to shadow MMU helper
  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             | 42 +++++++++++++++++++++++++++++++++-
 arch/x86/kvm/mmu/mmu.c         | 32 +++++++++++++++++++-------
 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             | 32 +++++++++++++++++++++-----
 9 files changed, 118 insertions(+), 24 deletions(-)

-- 
2.39.2




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