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KVM: TDX: Wrap mapping of leaf and non-leaf S-EPT entries into helpers

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Add a helper, tdx_sept_map_leaf_spte(), to wrap and isolate PAGE.ADD and
PAGE.AUG operations. Rename tdx_sept_link_private_spt() to
tdx_sept_map_nonleaf_spte() to wrap SEPT.ADD for symmetry.

Thus, transition tdx_sept_set_private_spte() into a "dispatch" routine for
setting/writing S-EPT entries.

No functional change intended.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Link: https://patch.msgid.link/20260509075500.4157-1-yan.y.zhao@intel.com
Signed-off-by: Sean Christopherson <seanjc@google.com>
This commit is contained in:
Sean Christopherson 2026-05-09 15:55:00 +08:00
parent 12d595795d
commit 176dcd88f4
1 changed files with 15 additions and 9 deletions
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24
arch/x86/kvm/vmx/tdx.c
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@ -1666,7 +1666,7 @@ static struct page *tdx_spte_to_sept_pt(struct kvm *kvm, gfn_t gfn,
return virt_to_page(sp->external_spt);
}
static int tdx_sept_link_private_spt(struct kvm *kvm, gfn_t gfn,
static int tdx_sept_map_nonleaf_spte(struct kvm *kvm, gfn_t gfn,
enum pg_level level, u64 mirror_spte)
{
gpa_t gpa = gfn_to_gpa(gfn);
@ -1688,18 +1688,12 @@ static int tdx_sept_link_private_spt(struct kvm *kvm, gfn_t gfn,
return 0;
}
static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
enum pg_level level, u64 mirror_spte)
static int tdx_sept_map_leaf_spte(struct kvm *kvm, gfn_t gfn, enum pg_level level,
u64 mirror_spte)
{
struct kvm_tdx *kvm_tdx = to_kvm_tdx(kvm);
kvm_pfn_t pfn = spte_to_pfn(mirror_spte);
if (KVM_BUG_ON(!is_shadow_present_pte(mirror_spte), kvm))
return -EIO;
if (!is_last_spte(mirror_spte, level))
return tdx_sept_link_private_spt(kvm, gfn, level, mirror_spte);
/* TODO: handle large pages. */
if (KVM_BUG_ON(level != PG_LEVEL_4K, kvm))
return -EIO;
@ -1724,6 +1718,18 @@ static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
return tdx_mem_page_aug(kvm, gfn, level, pfn);
}
static int tdx_sept_set_private_spte(struct kvm *kvm, gfn_t gfn,
enum pg_level level, u64 mirror_spte)
{
if (KVM_BUG_ON(!is_shadow_present_pte(mirror_spte), kvm))
return -EIO;
if (!is_last_spte(mirror_spte, level))
return tdx_sept_map_nonleaf_spte(kvm, gfn, level, mirror_spte);
return tdx_sept_map_leaf_spte(kvm, gfn, level, mirror_spte);
}
/*
* Ensure shared and private EPTs to be flushed on all vCPUs.
* tdh_mem_track() is the only caller that increases TD epoch. An increase in