semantic: 0.209
other: 0.208
device: 0.093
debug: 0.061
vnc: 0.060
network: 0.055
performance: 0.050
graphic: 0.047
permissions: 0.045
files: 0.042
socket: 0.039
PID: 0.037
boot: 0.033
KVM: 0.020
debug: 0.175
files: 0.162
other: 0.134
device: 0.106
PID: 0.059
semantic: 0.057
network: 0.051
boot: 0.049
performance: 0.042
vnc: 0.037
KVM: 0.034
socket: 0.033
graphic: 0.032
permissions: 0.028

ARM: HCR.TVM traps are not implemented

On AARCH64, setting HCR.TVM to 1 is supposed to trap all writes to CTLR_EL1, TTBR0_EL1, TTBR1_EL1, TCR_EL1, ESR_EL1, FAR_EL1, AFSR0_EL1, AFSR1_EL1, MAIR_EL1, AMAIR_EL1, and CONTEXTIDR_EL1. However, it currently has no effect (QEMU emulator version 4.1.1).

It is also likely that TRVM will not trap, but, I didn't verify this.

Yes to both.

Patch posted:
https://lists.nongnu.org/archive/html/qemu-devel/2020-02/msg04401.html

If you could help testing, that would be appreciated.

Thank you for the patch! I am happy to test this for you. I will apply the patch/compile/test and get back to you.

I tested in AArch64 mode and it worked for me. Looking at the patch, we might be missing trapping for "TTBCR"in AA32 though.

Oops.  Thanks for the review.  Posted v2 with ttbcr included.

Thank you! I also tested AArch32 and the code works. Ship it!

Fixed here:
https://git.qemu.org/?p=qemu.git;a=commitdiff;h=84929218512c