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hv: psram: add kconfig to enable psram

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Add two Kconfig pSRAM config:
one for whether to enable the pSRAM on the platfrom or not;
another for if the pSRAM is enabled on the platform whether to enable
the pSRAM in the pre-launched RTVM.
If we enable the pSRAM on the platform, we should remove the pSRAM EPT
mapping from the SOS to prevent it could flush the pSRAM cache.

Tracked-On: #5330
Signed-off-by: Qian Wang <qian1.wang@intel.com>
This commit is contained in:
Li Fei1 2020-10-29 22:47:37 +08:00 committed by wenlingz
parent 99ee76781f
commit c6f9404f55
2 changed files with 14 additions and 0 deletions
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9
hypervisor/arch/x86/Kconfig
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@ -276,6 +276,15 @@ config CDP_ENABLED
prioritization of code and data fetches to the L2 or L3 cache in a
software configurable manner, depending on hardware support.
config PSRAM_ENABLED
bool "Enable pseudo-SRAM (pSRAM) support"
depends on !CDP_ENABLED
default n
help
This will enable RTVM to make use of pSRAM to improve the performance
of Real-Time applications. pSRAM essentially a block of cache, and is separated via
CAT and protected by some methods. pSRAM support and CDP support cannot co-exist.
config GPU_SBDF
hex "Segment, Bus, Device, and function of the GPU"
depends on ACPI_PARSE_ENABLED

5
hypervisor/arch/x86/guest/vm.c
View File

@ -364,6 +364,11 @@ static void prepare_sos_vm_memmap(struct acrn_vm *vm)
/* unmap PCIe MMCONFIG region since it's owned by hypervisor */
pci_mmcfg = get_mmcfg_region();
ept_del_mr(vm, (uint64_t *)vm->arch_vm.nworld_eptp, pci_mmcfg->address, get_pci_mmcfg_size(pci_mmcfg));
/* TODO: remove pSRAM from SOS prevent SOS to use clflush to flush the pSRAM cache.
* If we remove this EPT mapping from the SOS, the ACRN-DM can't do pSRAM EPT mapping
* because the SOS can't get the HPA of this memory region.
*/
}
/* Add EPT mapping of EPC reource for the VM */