KVM: Dynamically size IPA and fault blocks on ARM64#13581
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KVM on ARM64 defaults to 40-bit IPA, but can be dynamically limited by the host. Previously, we assumed a fixed 40-bit IPA and used large fault block sizes (up to 4TB), which could lead to GPAs exceeding the guest's IPA space. This caused sentry to crash with "set memory region failed" (EFAULT/EINVAL) during platform initialization. Fix this by: 1. Dynamically detecting host max IPA and limiting PhysicalAddressBits (up to 40). 2. Reducing faultBlockSize to 1GB (from 8GB) on ARM64 if IPA is <= 39-bit to pack GPAs tighter. PiperOrigin-RevId: 944592838
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KVM: Dynamically size IPA and fault blocks on ARM64
KVM on ARM64 defaults to 40-bit IPA, but can be dynamically limited by the host.
Previously, we assumed a fixed 40-bit IPA and used large fault block sizes (up
to 4TB), which could lead to GPAs exceeding the guest's IPA space. This caused
sentry to crash with "set memory region failed" (EFAULT/EINVAL) during platform
initialization.
Fix this by:
40).
pack GPAs tighter.