KVM: x86/mmu: hard code more bits in kvm_init_shadow_npt_mmu

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The host CR0 does not really reflect onto the NPT format because
hCR0.PG=1 must be set and hCR0.WP is ignored.  Carve that in stone
by removing the cr0 argument from kvm_init_shadow_npt_mmu.

Pass in WP=1 as well; it does not matter for GMET disabled because
PFERR_USER_MASK is always set, but a cleared W bit in the nested page
tables cannot be overridden in supervisor mode when GMET is enabled,
either.  In fact, since CR0.WP=0 is the weird "extra accesses allowed"
mode, it is acutally easier think about it being always set.

Likewise, clear X86_CR4_SMAP to avoid that KVM erroneously faults on
supervisor accesses to an U=1 page.

Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>

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This commit is contained in:

Paolo Bonzini 2026-04-27 11:30:56 -04:00

parent 7658b9343a

commit ec65797ce3

3 changed files with 7 additions and 7 deletions

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4

arch/x86/kvm/mmu.h

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8

arch/x86/kvm/mmu/mmu.c

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2

arch/x86/kvm/svm/nested.c

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