arm64/boot: Disable trapping of PMZR_EL0 writes to EL2grafted

__init_el2_fgt2() writes one mask to both HDFGRTR2_EL2 and HDFGWTR2_EL2.
PMZR_EL0 is write-only, so its trap bit, nPMZR_EL0, exists only in
HDFGWTR2_EL2 and is therefore never set: a PMZR_EL0 write from the host
traps to EL2, where the nVHE hypervisor has no handler and BUG()s. The
kernel never writes PMZR_EL0, but kernel.perf_user_access=1 has the PMU
driver set PMUSERENR_EL0.UEN for a task with a user-read event, so a
write from EL0 reaches the trap and takes the host down without a panic
message.

Accumulate the HDFGWTR2_EL2 bits separately, as __init_el2_fgt() already
does for HDFGWTR_EL2, and set nPMZR_EL0 with the other FEAT_PMUv3p9
bits.

Fixes: 858c7bfcb35e1 ("arm64/boot: Enable EL2 requirements for FEAT_PMUv3p9")
Cc: stable@vger.kernel.org
Signed-off-by: Fuad Tabba <fuad.tabba@linux.dev>
Reviewed-by: Anshuman Khandual <anshuman.khandual@arm.com>
Reviewed-by: Oliver Upton <oupton@kernel.org>
Signed-off-by: Will Deacon <will@kernel.org>

1 files changed, 107 insertions, 0 deletions

diff --git a/drivers/android/binder/trace.rs b/drivers/android/binder/trace.rs
new file mode 100644
index 000000000..06aabb3cc
--- /dev/null
+++ b/drivers/android/binder/trace.rs
@@ -0,0 +1,107 @@
+// SPDX-License-Identifier: GPL-2.0
+
+// Copyright (C) 2025 Google LLC.
+
+use crate::transaction::Transaction;
+
+use core::ptr;
+
+use kernel::bindings::{rust_binder_transaction, task_struct};
+use kernel::error::Result;
+use kernel::ffi::{c_int, c_uint, c_ulong};
+use kernel::task::Task;
+use kernel::tracepoint::declare_trace;
+
+declare_trace! {
+    unsafe fn binder_ioctl(cmd: c_uint, arg: c_ulong);
+    unsafe fn binder_ioctl_done(ret: c_int);
+    unsafe fn binder_read_done(ret: c_int);
+    unsafe fn binder_write_done(ret: c_int);
+    unsafe fn binder_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool);
+    unsafe fn binder_transaction(reply: bool, t: rust_binder_transaction, thread: *mut task_struct);
+    unsafe fn binder_transaction_received(t: rust_binder_transaction);
+    unsafe fn binder_transaction_fd_send(t_debug_id: c_int, fd: c_int, offset: usize);
+    unsafe fn binder_transaction_fd_recv(t_debug_id: c_int, fd: c_int, offset: usize);
+    unsafe fn binder_command(cmd: u32);
+    unsafe fn binder_return(ret: u32);
+}
+
+#[inline]
+fn raw_transaction(t: &Transaction) -> rust_binder_transaction {
+    ptr::from_ref(t).cast_mut().cast()
+}
+
+#[inline]
+fn to_errno(ret: Result) -> i32 {
+    match ret {
+        Ok(()) => 0,
+        Err(err) => err.to_errno(),
+    }
+}
+
+#[inline]
+pub(crate) fn trace_ioctl(cmd: u32, arg: usize) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_ioctl(cmd, arg as c_ulong) }
+}
+
+#[inline]
+pub(crate) fn trace_ioctl_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_ioctl_done(to_errno(ret)) }
+}
+#[inline]
+pub(crate) fn trace_read_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_read_done(to_errno(ret)) }
+}
+#[inline]
+pub(crate) fn trace_write_done(ret: Result) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_write_done(to_errno(ret)) }
+}
+
+#[inline]
+pub(crate) fn trace_wait_for_work(proc_work: bool, transaction_stack: bool, thread_todo: bool) {
+    // SAFETY: Always safe to call.
+    unsafe { binder_wait_for_work(proc_work, transaction_stack, thread_todo) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction(reply: bool, t: &Transaction, thread: Option<&Task>) {
+    let thread = match thread {
+        Some(thread) => thread.as_ptr(),
+        None => core::ptr::null_mut(),
+    };
+    // SAFETY: The raw transaction is valid for the duration of this call. The thread pointer is
+    // valid or null.
+    unsafe { binder_transaction(reply, raw_transaction(t), thread) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction_received(t: &Transaction) {
+    // SAFETY: The raw transaction is valid for the duration of this call.
+    unsafe { binder_transaction_received(raw_transaction(t)) }
+}
+
+#[inline]
+pub(crate) fn trace_transaction_fd_send(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_send(t_debug_id as c_int, fd as c_int, offset) }
+}
+#[inline]
+pub(crate) fn trace_transaction_fd_recv(t_debug_id: usize, fd: u32, offset: usize) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_transaction_fd_recv(t_debug_id as c_int, fd as c_int, offset) }
+}
+
+#[inline]
+pub(crate) fn trace_command(cmd: u32) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_command(cmd) }
+}
+#[inline]
+pub(crate) fn trace_return(ret: u32) {
+    // SAFETY: This function is always safe to call.
+    unsafe { binder_return(ret) }
+}