Re: [PATCH 1/3] target/arm: Mark registers which call pmu_op_start() as ARM_CP_IO

[Richard Henderson <richard.henderson@linaro.org>]

On 9/23/22 05:34, Peter Maydell wrote:
> In commit 01765386a888 we made some system register write functions
> call pmu_op_start()/pmu_op_finish(). This means that they now touch
> timers, so for icount to work these registers must have the ARM_CP_IO
> flag set.
> 
> This fixes a bug where when icount is enabled a guest that touches
> MDCR_EL3, MDCR_EL2, PMCNTENSET_EL0 or PMCNTENCLR_EL0 would cause
> QEMU to print an error message and exit, for example:
> 
> [    2.495971] TCP: Hash tables configured (established 1024 bind 1024)
> [    2.496213] UDP hash table entries: 256 (order: 1, 8192 bytes)
> [    2.496386] UDP-Lite hash table entries: 256 (order: 1, 8192 bytes)
> [    2.496917] NET: Registered protocol family 1
> qemu-system-aarch64: Bad icount read
> 
> Reported-by: Thomas Huth<thuth@redhat.com>
> Signed-off-by: Peter Maydell<peter.maydell@linaro.org>
> ---
>   target/arm/helper.c | 12 ++++++------
>   1 file changed, 6 insertions(+), 6 deletions(-)

Reviewed-by: Richard Henderson <richard.henderson@linaro.org>

r~