ARM physical heap: exclude all identity-mapped memory #2087
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When an Azure instance starts, a few seconds may elapse before its network interface acquires a DHCP address, and during this time interval the Azure Wire Server is unreachable. To avoid potentially misleading log output, do not print error messages if connection to the server fails at the first attempt.
The memory range that is identity-mapped during boot is used, among other things, as temporary stack for both the boot processor and the secondary processors; theefore, it should not be included in the physical memory ranges, otherwise a secondary processor can corrupt memory that has been allocated for other kernel uses. This fixes unhandled exceptions that cause boot failures when running the kernel on Azure Standard_D2ps_v5 instances.
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The memory range that is identity-mapped during boot is used, among other things, as temporary stack for both the boot processor and the secondary processors; therefore, it should not be included in the physical memory ranges, otherwise a secondary processor can corrupt memory that has been allocated for other kernel uses. This fixes unhandled exceptions that cause boot failures when running the kernel on Azure Standard_D2ps_v5 instances.
In addition, the Azure cloud_init code is being amended to avoid printing a potentially misleading error message if an unsuccessful attempt to connect to the Azure Wire Server is made before the network interface acquires a DHCP address.