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[Qemu-devel] [RFC PATCH 18/20] i386: acpi: Add SGX EPC entry to ACPI tab
From: |
Sean Christopherson |
Subject: |
[Qemu-devel] [RFC PATCH 18/20] i386: acpi: Add SGX EPC entry to ACPI tables |
Date: |
Tue, 6 Aug 2019 11:56:47 -0700 |
The ACPI Device entry for SGX EPC is essentially a hack whose primary
purpose is to provide software with a way to autoprobe SGX support,
e.g. to allow software to implement SGX support as a driver. Details
on the individual EPC sections are not enumerated through ACPI tables,
i.e. software must enumerate the EPC sections via CPUID. Furthermore,
software expects to see only a single EPC Device in the ACPI tables
regardless of the number of EPC sections in the system.
However, several versions of Windows do rely on the ACPI tables to
enumerate the address and size of the EPC. So, regardless of the number
of EPC sections exposed to the guest, create exactly *one* EPC device
with a _CRS entry that spans the entirety of all EPC sections (which are
guaranteed to be contiguous in QEMU).
Note, NUMA support for EPC memory is intentionally not considered as
enumerating EPC NUMA information is not yet defined for bare metal.
Signed-off-by: Sean Christopherson <address@hidden>
---
hw/i386/acpi-build.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)
diff --git a/hw/i386/acpi-build.c b/hw/i386/acpi-build.c
index f3fdfefcd5..73d5321e0e 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -2222,6 +2222,28 @@ build_dsdt(GArray *table_data, BIOSLinker *linker,
aml_append(sb_scope, dev);
}
+ if (pcms->sgx_epc) {
+ uint64_t epc_base = pcms->sgx_epc->base;
+ uint64_t epc_size = pcms->sgx_epc->size;
+
+ dev = aml_device("EPC");
+ aml_append(dev, aml_name_decl("_HID", aml_eisaid("INT0E0C")));
+ aml_append(dev, aml_name_decl("_STR",
+ aml_unicode("Enclave Page Cache 1.0")));
+ crs = aml_resource_template();
+ aml_append(crs,
+ aml_qword_memory(AML_POS_DECODE, AML_MIN_FIXED,
+ AML_MAX_FIXED, AML_NON_CACHEABLE,
+ AML_READ_WRITE, 0, epc_base,
+ epc_base + epc_size - 1, 0, epc_size));
+ aml_append(dev, aml_name_decl("_CRS", crs));
+
+ method = aml_method("_STA", 0, AML_NOTSERIALIZED);
+ aml_append(method, aml_return(aml_int(0x0f)));
+ aml_append(dev, method);
+
+ aml_append(sb_scope, dev);
+ }
aml_append(dsdt, sb_scope);
/* copy AML table into ACPI tables blob and patch header there */
--
2.22.0
- [Qemu-devel] [RFC PATCH 10/20] i386: Update SGX CPUID info according to hardware/KVM/user input, (continued)
- [Qemu-devel] [RFC PATCH 10/20] i386: Update SGX CPUID info according to hardware/KVM/user input, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 14/20] i386: Adjust min CPUID level to 0x12 when SGX is enabled, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 06/20] i386: Add SGX CPUID leaf FEAT_SGX_12_1_EAX, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 12/20] i386: kvm: Add support for exposing PROVISIONKEY to guest, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 07/20] i386: Add SGX CPUID leaf FEAT_SGX_12_1_EBX, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 11/20] linux-headers: Add temporary placeholder for KVM_CAP_SGX_ATTRIBUTE, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 02/20] i386: Add 'sgx-epc' device to expose EPC sections to guest, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 03/20] vl: Add "sgx-epc" option to expose SGX EPC sections to guest, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 20/20] i440fx: Add support for SGX EPC, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 18/20] i386: acpi: Add SGX EPC entry to ACPI tables,
Sean Christopherson <=
- [Qemu-devel] [RFC PATCH 16/20] hw/i386/pc: Account for SGX EPC sections when calculating device memory, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 19/20] q35: Add support for SGX EPC, Sean Christopherson, 2019/08/06
- [Qemu-devel] [RFC PATCH 13/20] i386: Propagate SGX CPUID sub-leafs to KVM, Sean Christopherson, 2019/08/06
- Re: [Qemu-devel] [RFC PATCH 00/20] i386: Add support for Intel SGX, no-reply, 2019/08/06
- Re: [Qemu-devel] [RFC PATCH 00/20] i386: Add support for Intel SGX, no-reply, 2019/08/06