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kvm: mmu: Separate making non-leaf sptes from link_shadow_page 

The TDP MMU page fault handler will need to be able to create non-leaf
SPTEs to build up the paging structures. Rather than re-implementing the
function, factor the SPTE creation out of link_shadow_page.

Tested by running kvm-unit-tests and KVM selftests on an Intel Haswell
machine. This series introduced no new failures.

This series can be viewed in Gerrit at:
	https://linux-review.googlesource.com/c/virt/kvm/kvm/+/2538

Signed-off-by: Ben Gardon <bgardon@google.com>
Message-Id: <20200925212302.3979661-9-bgardon@google.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Ben Gardon 2020-09-25 14:22:48 -07:00 committed by Paolo Bonzini
parent c0623f5e5d
commit cc4674d0de
1 changed files with 16 additions and 7 deletions
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23
arch/x86/kvm/mmu/mmu.c
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@ -2573,6 +2573,21 @@ static void shadow_walk_next(struct kvm_shadow_walk_iterator *iterator)
__shadow_walk_next(iterator, *iterator->sptep);
}
static u64 make_nonleaf_spte(u64 *child_pt, bool ad_disabled)
{
u64 spte;
spte = __pa(child_pt) | shadow_present_mask | PT_WRITABLE_MASK |
shadow_user_mask | shadow_x_mask | shadow_me_mask;
if (ad_disabled)
spte |= SPTE_AD_DISABLED_MASK;
else
spte |= shadow_accessed_mask;
return spte;
}
static void link_shadow_page(struct kvm_vcpu *vcpu, u64 *sptep,
struct kvm_mmu_page *sp)
{
@ -2580,13 +2595,7 @@ static void link_shadow_page(struct kvm_vcpu *vcpu, u64 *sptep,
BUILD_BUG_ON(VMX_EPT_WRITABLE_MASK != PT_WRITABLE_MASK);
spte = __pa(sp->spt) | shadow_present_mask | PT_WRITABLE_MASK |
shadow_user_mask | shadow_x_mask | shadow_me_mask;
if (sp_ad_disabled(sp))
spte |= SPTE_AD_DISABLED_MASK;
else
spte |= shadow_accessed_mask;
spte = make_nonleaf_spte(sp->spt, sp_ad_disabled(sp));
mmu_spte_set(sptep, spte);