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[PATCH v2 20/32] i386: acpi: Add SGX EPC entry to ACPI tables
From: |
Yang Zhong |
Subject: |
[PATCH v2 20/32] i386: acpi: Add SGX EPC entry to ACPI tables |
Date: |
Tue, 11 May 2021 14:20:39 +0800 |
From: Sean Christopherson <sean.j.christopherson@intel.com>
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 <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
---
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 bfecb0038c..0fd967e9c8 100644
--- a/hw/i386/acpi-build.c
+++ b/hw/i386/acpi-build.c
@@ -1800,6 +1800,28 @@ 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 */
--
2.29.2.334.gfaefdd61ec
- [PATCH v2 09/32] i386: Add SGX CPUID leaf FEAT_SGX_12_1_EAX, (continued)
- [PATCH v2 09/32] i386: Add SGX CPUID leaf FEAT_SGX_12_1_EAX, Yang Zhong, 2021/05/11
- [PATCH v2 10/32] i386: Add get/set/migrate support for SGX_LEPUBKEYHASH MSRs, Yang Zhong, 2021/05/11
- [PATCH v2 12/32] i386: Update SGX CPUID info according to hardware/KVM/user input, Yang Zhong, 2021/05/11
- [PATCH v2 13/32] linux-headers: Add placeholder for KVM_CAP_SGX_ATTRIBUTE, Yang Zhong, 2021/05/11
- [PATCH v2 14/32] i386: kvm: Add support for exposing PROVISIONKEY to guest, Yang Zhong, 2021/05/11
- [PATCH v2 15/32] i386: Propagate SGX CPUID sub-leafs to KVM, Yang Zhong, 2021/05/11
- [PATCH v2 16/32] Adjust min CPUID level to 0x12 when SGX is enabled, Yang Zhong, 2021/05/11
- [PATCH v2 17/32] hw/i386/fw_cfg: Set SGX bits in feature control fw_cfg accordingly, Yang Zhong, 2021/05/11
- [PATCH v2 18/32] hw/i386/pc: Account for SGX EPC sections when calculating device memory, Yang Zhong, 2021/05/11
- [PATCH v2 19/32] i386/pc: Add e820 entry for SGX EPC section(s), Yang Zhong, 2021/05/11
- [PATCH v2 20/32] i386: acpi: Add SGX EPC entry to ACPI tables,
Yang Zhong <=
- [PATCH v2 21/32] q35: Add support for SGX EPC, Yang Zhong, 2021/05/11
- [PATCH v2 24/32] sgx-epc: Add the reset interface for sgx-epc virt device, Yang Zhong, 2021/05/11
- [PATCH v2 22/32] i440fx: Add support for SGX EPC, Yang Zhong, 2021/05/11
- [PATCH v2 23/32] hostmem: Add the reset interface for EPC backend reset, Yang Zhong, 2021/05/11
- [PATCH v2 25/32] qmp: Add query-sgx command, Yang Zhong, 2021/05/11
- [PATCH v2 26/32] hmp: Add 'info sgx' command, Yang Zhong, 2021/05/11
- [PATCH v2 27/32] i386: Add sgx_get_info() interface, Yang Zhong, 2021/05/11
- [PATCH v2 28/32] bitops: Support 32 and 64 bit mask macro, Yang Zhong, 2021/05/11
- [PATCH v2 30/32] Kconfig: Add CONFIG_SGX support, Yang Zhong, 2021/05/11
- [PATCH v2 31/32] sgx-epc: Add the fill_device_info() callback support, Yang Zhong, 2021/05/11