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KVM: x86/mmu: Add an is_mirror member for union kvm_mmu_page_role

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Introduce a "is_mirror" member to the kvm_mmu_page_role union to identify
SPTEs associated with the mirrored EPT.

The TDX module maintains the private half of the EPT mapped in the TD in
its protected memory. KVM keeps a copy of the private GPAs in a mirrored
EPT tree within host memory. This "is_mirror" attribute enables vCPUs to
find and get the root page of mirrored EPT from the MMU root list for a
guest TD. This also allows KVM MMU code to detect changes in mirrored EPT
according to the "is_mirror" mmu page role and propagate the changes to
the private EPT managed by TDX module.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Message-ID: <20240718211230.1492011-6-rick.p.edgecombe@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2024-07-18 14:12:17 -07:00 committed by Paolo Bonzini
parent 3a4eb364a4
commit 6961ab0bae
3 changed files with 15 additions and 3 deletions
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8
arch/x86/include/asm/kvm_host.h
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@ -313,10 +313,11 @@ struct kvm_kernel_irq_routing_entry;
* the number of unique SPs that can theoretically be created is 2^n, where n * the number of unique SPs that can theoretically be created is 2^n, where n
* is the number of bits that are used to compute the role. * is the number of bits that are used to compute the role.
* *
* But, even though there are 19 bits in the mask below, not all combinations * But, even though there are 20 bits in the mask below, not all combinations
* of modes and flags are possible: * of modes and flags are possible:
* *
* - invalid shadow pages are not accounted, so the bits are effectively 18 * - invalid shadow pages are not accounted, mirror pages are not shadowed,
* so the bits are effectively 18.
* *
* - quadrant will only be used if has_4_byte_gpte=1 (non-PAE paging); * - quadrant will only be used if has_4_byte_gpte=1 (non-PAE paging);
* execonly and ad_disabled are only used for nested EPT which has * execonly and ad_disabled are only used for nested EPT which has
@ -349,7 +350,8 @@ union kvm_mmu_page_role {
unsigned ad_disabled:1; unsigned ad_disabled:1;
unsigned guest_mode:1; unsigned guest_mode:1;
unsigned passthrough:1; unsigned passthrough:1;
unsigned :5; unsigned is_mirror:1;
unsigned :4;
/* /*
* This is left at the top of the word so that * This is left at the top of the word so that

5
arch/x86/kvm/mmu/mmu_internal.h
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@ -157,6 +157,11 @@ static inline int kvm_mmu_page_as_id(struct kvm_mmu_page *sp)
return kvm_mmu_role_as_id(sp->role); return kvm_mmu_role_as_id(sp->role);
} }
static inline bool is_mirror_sp(const struct kvm_mmu_page *sp)
{
return sp->role.is_mirror;
}
static inline void kvm_mmu_alloc_external_spt(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp) static inline void kvm_mmu_alloc_external_spt(struct kvm_vcpu *vcpu, struct kvm_mmu_page *sp)
{ {
/* /*

5
arch/x86/kvm/mmu/spte.h
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@ -276,6 +276,11 @@ static inline struct kvm_mmu_page *root_to_sp(hpa_t root)
return spte_to_child_sp(root); return spte_to_child_sp(root);
} }
static inline bool is_mirror_sptep(tdp_ptep_t sptep)
{
return is_mirror_sp(sptep_to_sp(rcu_dereference(sptep)));
}
static inline bool is_mmio_spte(struct kvm *kvm, u64 spte) static inline bool is_mmio_spte(struct kvm *kvm, u64 spte)
{ {
return (spte & shadow_mmio_mask) == kvm->arch.shadow_mmio_value && return (spte & shadow_mmio_mask) == kvm->arch.shadow_mmio_value &&