1. 12 Nov, 2023 1 commit
    • Saurabh Sengar's avatar
      x86/hyperv: Fix the detection of E820_TYPE_PRAM in a Gen2 VM · 7e8037b0
      Saurabh Sengar authored
      A Gen2 VM doesn't support legacy PCI/PCIe, so both raw_pci_ops and
      raw_pci_ext_ops are NULL, and pci_subsys_init() -> pcibios_init()
      doesn't call pcibios_resource_survey() -> e820__reserve_resources_late();
      as a result, any emulated persistent memory of E820_TYPE_PRAM (12) via
      the kernel parameter memmap=nn[KMG]!ss is not added into iomem_resource
      and hence can't be detected by register_e820_pmem().
      
      Fix this by directly calling e820__reserve_resources_late() in
      hv_pci_init(), which is called from arch_initcall(pci_arch_init).
      
      It's ok to move a Gen2 VM's e820__reserve_resources_late() from
      subsys_initcall(pci_subsys_init) to arch_initcall(pci_arch_init) because
      the code in-between doesn't depend on the E820 resources.
      e820__reserve_resources_late() depends on e820__reserve_resources(),
      which has been called earlier from setup_arch().
      
      For a Gen-2 VM, the new hv_pci_init() also adds any memory of
      E820_TYPE_PMEM (7) into iomem_resource, and acpi_nfit_register_region() ->
      acpi_nfit_insert_resource() -> region_intersects() returns
      REGION_INTERSECTS, so the memory of E820_TYPE_PMEM won't get added twice.
      
      Changed the local variable "int gen2vm" to "bool gen2vm".
      Signed-off-by: default avatarSaurabh Sengar <ssengar@linux.microsoft.com>
      Signed-off-by: default avatarDexuan Cui <decui@microsoft.com>
      Signed-off-by: default avatarWei Liu <wei.liu@kernel.org>
      Message-ID: <1699691867-9827-1-git-send-email-ssengar@linux.microsoft.com>
      7e8037b0
  2. 10 Nov, 2023 1 commit
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