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hw/i386/pc: Account for SGX EPC sections when calculating device memory 

Add helpers to detect if SGX EPC exists above 4g, and if so, where SGX
EPC above 4g ends.  Use the helpers to adjust the device memory range
if SGX EPC exists above 4g.

For multiple virtual EPC sections, we just put them together physically
contiguous for the simplicity because we don't support EPC NUMA affinity
now. Once the SGX EPC NUMA support in the kernel SGX driver, we will
support this in the future.

Note that SGX EPC is currently hardcoded to reside above 4g.

Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
Signed-off-by: Yang Zhong <yang.zhong@intel.com>
Message-Id: <20210719112136.57018-18-yang.zhong@intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Sean Christopherson 2021-07-19 19:21:20 +08:00 committed by Paolo Bonzini
parent e2560114cd
commit 0cf4ce00d2
2 changed files with 17 additions and 1 deletions
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11
hw/i386/pc.c
View File

@ -919,8 +919,15 @@ void pc_memory_init(PCMachineState *pcms,
exit(EXIT_FAILURE);
}
if (pcms->sgx_epc.size != 0) {
machine->device_memory->base = sgx_epc_above_4g_end(&pcms->sgx_epc);
} else {
machine->device_memory->base =
0x100000000ULL + x86ms->above_4g_mem_size;
}
machine->device_memory->base =
ROUND_UP(0x100000000ULL + x86ms->above_4g_mem_size, 1 * GiB);
ROUND_UP(machine->device_memory->base, 1 * GiB);
if (pcmc->enforce_aligned_dimm) {
/* size device region assuming 1G page max alignment per slot */
@ -1005,6 +1012,8 @@ uint64_t pc_pci_hole64_start(void)
if (!pcmc->broken_reserved_end) {
hole64_start += memory_region_size(&ms->device_memory->mr);
}
} else if (pcms->sgx_epc.size != 0) {
hole64_start = sgx_epc_above_4g_end(&pcms->sgx_epc);
} else {
hole64_start = 0x100000000ULL + x86ms->above_4g_mem_size;
}

7
include/hw/i386/sgx-epc.h
View File

@ -57,4 +57,11 @@ typedef struct SGXEPCState {
int sgx_epc_get_section(int section_nr, uint64_t *addr, uint64_t *size);
static inline uint64_t sgx_epc_above_4g_end(SGXEPCState *sgx_epc)
{
assert(sgx_epc != NULL && sgx_epc->base >= 0x100000000ULL);
return sgx_epc->base + sgx_epc->size;
}
#endif