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KVM: TDX: Set gfn_direct_bits to shared bit

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Make the direct root handle memslot GFNs at an alias with the TDX shared
bit set.

For TDX shared memory, the memslot GFNs need to be mapped at an alias with
the shared bit set. These shared mappings will be mapped on the KVM MMU's
"direct" root. The direct root has it's mappings shifted by applying
"gfn_direct_bits" as a mask. The concept of "GPAW" (guest physical address
width) determines the location of the shared bit. So set gfn_direct_bits
based on this, to map shared memory at the proper GPA.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Co-developed-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
Co-developed-by: Yan Zhao <yan.y.zhao@intel.com>
Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Message-ID: <20241112073613.22100-1-yan.y.zhao@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata 2024-11-12 15:36:13 +08:00 committed by Paolo Bonzini
parent 87e3f45e80
commit e0fbb3bbb5
1 changed files with 5 additions and 0 deletions
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5
arch/x86/kvm/vmx/tdx.c
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@ -1051,6 +1051,11 @@ static int tdx_td_init(struct kvm *kvm, struct kvm_tdx_cmd *cmd)
kvm_tdx->attributes = td_params->attributes;
kvm_tdx->xfam = td_params->xfam;
if (td_params->config_flags & TDX_CONFIG_FLAGS_MAX_GPAW)
kvm->arch.gfn_direct_bits = TDX_SHARED_BIT_PWL_5;
else
kvm->arch.gfn_direct_bits = TDX_SHARED_BIT_PWL_4;
kvm_tdx->state = TD_STATE_INITIALIZED;
out:
/* kfree() accepts NULL. */