[atishp04]

Summary by Sourcery

Support the SBI v3 PMU event info extension with extended raw event widths and integrate it into KVM with proper guest memory validation

New Features:

• Add SBI v3 PMU event info support via pmu_sbi_check_event_info and riscv_pmu_get_event_info to query firmware for available events
• Extend raw PMU event encoding to 56 bits for SBI v3 with new masks (RISCV_PMU_RAW_EVENT_V2_MASK) and index (RISCV_PMU_RAW_EVENT_V2_IDX)
• Introduce KVM SBI v3 PMU event info handler (kvm_riscv_vcpu_pmu_event_info) and expose SBI_EXT_PMU_EVENT_GET_INFO in KVM

Enhancements:

• Add sbi_v3_available flag and conditionally use v3-specific event probing
• Simplify pmu_sbi_event_map by delegating to riscv_pmu_get_event_info
• Add kvm_vcpu_validate_gpa_range helper and replace direct GPA-to-HVA checks in KVM PMU/SBI handlers
• Update KVM SBI version to 3.0 and add new SBI PMU extension ID for event info

Summary by CodeRabbit

• New Features

  • Added support for SBI PMU version 3.0, including extended event configuration and new event types.
  • Introduced the ability to query information for multiple PMU events in bulk.
  • Enhanced PMU event mapping and validation for improved compatibility and accuracy.

• Bug Fixes

  • Improved validation of guest physical address ranges and permissions for memory operations.

• Refactor

  • Simplified and centralized event info retrieval and address validation logic for better maintainability.