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hv: update SSRAM regions EPT memory type to WB 

when SSRAM regions are assigned to service VM
  to support virtulization of SSRAM for post-launched
  RTVMs, service VM need to access all SSRAM regions
  for management, typically, service VM does data
  cleanup in SSRAM region when it is reclaimed from
  a shutdown RTVM.

  This patch update memory type from UC(by default)
  to WB, else SSARM region will be evicted when access
  from guest happens.

Tracked-On: #7425
Signed-off-by: Yonghua Huang <yonghua.huang@intel.com>
This commit is contained in:
Yonghua Huang 2022-05-06 11:22:05 +03:00 committed by acrnsi-robot
parent d6a69970c6
commit 961b5d16f4
1 changed files with 28 additions and 10 deletions
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38
hypervisor/arch/x86/guest/vm.c
View File

@ -538,16 +538,34 @@ static void prepare_service_vm_memmap(struct acrn_vm *vm)
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));
/* remove Software SRAM region from Service VM EPT, to prevent Service VM from using clflush to
* flush the Software SRAM cache.
* This is applicable to prelaunch RTVM case only. And only the part that prelaunch RTVM uses needs
* to be removed from Service VM EPT.
*
* PRE_RTVM_SW_SRAM_MAX_SIZE is the size of Software SRAM that prelaunch RTVM uses, presumed to be
* starting from Software SRAM base. For other cases, PRE_RTVM_SW_SRAM_MAX_SIZE should be defined
* as 0, and no region is removed from Service VM EPT.
*/
ept_del_mr(vm, pml4_page, service_vm_hpa2gpa(get_software_sram_base()), PRE_RTVM_SW_SRAM_MAX_SIZE);
if (is_software_sram_enabled()) {
/*
* Native Software SRAM resources shall be assigned to either Pre-launched RTVM
* or Service VM. Software SRAM support for Post-launched RTVM is virtualized
* in Service VM.
*
* 1) Native Software SRAM resources are assigned to Pre-launched RTVM:
* - Remove Software SRAM regions from Service VM EPT, to prevent
* Service VM from using clflush to flush the Software SRAM cache.
* - PRE_RTVM_SW_SRAM_MAX_SIZE is the size of Software SRAM that
* Pre-launched RTVM uses, presumed to be starting from Software SRAM base.
* For other cases, PRE_RTVM_SW_SRAM_MAX_SIZE should be defined as 0,
* and no region will be removed from Service VM EPT.
*
* 2) Native Software SRAM resources are assigned to Service VM:
* - Software SRAM regions are added to EPT of Service VM by default
* with memory type UC.
* - But, Service VM need to access Software SRAM regions
* when virtualizing them for Post-launched RTVM.
* - So memory type of Software SRAM regions in EPT shall be updated to EPT_WB.
*/
#if (PRE_RTVM_SW_SRAM_MAX_SIZE > 0U)
ept_del_mr(vm, pml4_page, service_vm_hpa2gpa(get_software_sram_base()), PRE_RTVM_SW_SRAM_MAX_SIZE);
#else
ept_modify_mr(vm, pml4_page, service_vm_hpa2gpa(get_software_sram_base()),
get_software_sram_size(), EPT_WB, EPT_MT_MASK);
#endif
}
/* unmap Intel IOMMU register pages for below reason:
* Service VM can detect IOMMU capability in its ACPI table hence it may access