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8607daa214
KVM/arm64 fixes for 6.3, part #2 Fixes for a rather interesting set of bugs relating to the MMU: - Read the MMU notifier seq before dropping the mmap lock to guard against reading a potentially stale VMA - Disable interrupts when walking user page tables to protect against the page table being freed - Read the MTE permissions for the VMA within the mmap lock critical section, avoiding the use of a potentally stale VMA pointer Additionally, some fixes targeting the vPMU: - Return the sum of the current perf event value and PMC snapshot for reads from userspace - Don't save the value of guest writes to PMCR_EL0.{C,P}, which could otherwise lead to userspace erroneously resetting the vPMU during VM save/restore