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a72c71b77d
Currently if option '-icount auto' is passed to the QEMU TCG to enable counting instructions the VM crashes with the following error report when Linux runs on it: qemu-system-ppc64: Bad icount read This happens because read/write access to the SPRs PURR, VTB, and TBU40 is not integrated to the icount framework. This commit fixes that issue by making the read/write access of these SPRs aware of icount framework, adding the proper gen_io_start() calls before calling the helpers to load/store these SPRs in TCG and ensuring that the associated TBs end immediately after, accordingly to what's in docs/devel/tcg-icount.rst. Signed-off-by: Gustavo Romero <gromero@linux.ibm.com> Message-Id: <20200811153235.4527-1-gromero@linux.ibm.com> Reviewed-by: Richard Henderson <richard.henderson@linaro.org> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>