From: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
Wire up TDX PV map_gpa hypercall to the kvm/mmu backend.
Signed-off-by: Isaku Yamahata <isaku.yamahata@xxxxxxxxx>
---
arch/x86/kvm/vmx/tdx.c | 53 ++++++++++++++++++++++++++++++++++++++++++
1 file changed, 53 insertions(+)
diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index f20fcf8325aa..08a4e63e4aea 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -1225,6 +1225,57 @@ static int tdx_emulate_wrmsr(struct kvm_vcpu *vcpu)
return 1;
}
+static int tdx_map_gpa(struct kvm_vcpu *vcpu)
+{
+ struct kvm *kvm = vcpu->kvm;
+ gpa_t gpa = tdvmcall_a0_read(vcpu);
+ gpa_t size = tdvmcall_a1_read(vcpu);
+ gpa_t end = gpa + size;
+ gfn_t s = gpa_to_gfn(gpa) & ~kvm_gfn_shared_mask(kvm);
+ gfn_t e = gpa_to_gfn(end) & ~kvm_gfn_shared_mask(kvm);
+ int i;
+
+ if (!IS_ALIGNED(gpa, 4096) || !IS_ALIGNED(size, 4096) ||
+ end < gpa ||
+ end > kvm_gfn_shared_mask(kvm) << (PAGE_SHIFT + 1) ||
+ kvm_is_private_gpa(kvm, gpa) != kvm_is_private_gpa(kvm, end)) {
+ tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+ return 1;
+ }
+
+ /*
+ * Check how the requested region overlaps with the KVM memory slots.
+ * For simplicity, require that it must be contained within a memslot or
+ * it must not overlap with any memslots (MMIO).
+ */
+ for (i = 0; i < kvm_arch_nr_memslot_as_ids(kvm); i++) {
+ struct kvm_memslots *slots = __kvm_memslots(kvm, i);
+ struct kvm_memslot_iter iter;
+
+ kvm_for_each_memslot_in_gfn_range(&iter, slots, s, e) {
+ struct kvm_memory_slot *slot = iter.slot;
+ gfn_t slot_s = slot->base_gfn;
+ gfn_t slot_e = slot->base_gfn + slot->npages;
+
+ /* no overlap */
+ if (e < slot_s || s >= slot_e)
+ continue;
+
+ /* contained in slot */
+ if (slot_s <= s && e <= slot_e) {
+ if (kvm_slot_can_be_private(slot))
+ return tdx_vp_vmcall_to_user(vcpu);
+ continue;
+ }
+
+ break;
+ }
+ }
+
+ tdvmcall_set_return_code(vcpu, TDG_VP_VMCALL_INVALID_OPERAND);
+ return 1;
+}
+
static int handle_tdvmcall(struct kvm_vcpu *vcpu)
{
if (tdvmcall_exit_type(vcpu))
@@ -1250,6 +1301,8 @@ static int handle_tdvmcall(struct kvm_vcpu *vcpu)
* guest TD doesn't make sense. No argument check is done.
*/
return tdx_vp_vmcall_to_user(vcpu);
+ case TDG_VP_VMCALL_MAP_GPA:
+ return tdx_map_gpa(vcpu);
default:
break;
}
--
2.25.1
