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

[Sean Christopherson <seanjc@google.com>]

On Mon, May 08, 2023, Mathias Krause wrote:
> 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@grsecurity.net/
> [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

Acked-by: Sean Christopherson <seanjc@google.com>