On 19.07.14 12:14, Paul Mackerras wrote:
At present, kvmppc_handle_load and kvmppc_handle_store only handle emulated MMIO loads and stores. This extends them to be able to handle loads and stores to guest memory as well. This is so that kvmppc_emulate_instruction can be used to emulate loads and stores in cases other than when an attempt to execute the instruction by the CPU has resulted in an interrupt. To avoid having to look up the translation for the effective address again in kvmppc_handle_load/store when the caller of kvmppc_emulate_mmio has already done it, we arrange to pass down the translation in a new struct kvmppc_translated_address, which is a new argument to kvmppc_emulate_mmio() and kvmppc_emulate_instruction(). This also enables us to check that the guest hasn't replaced a load with a store instruction. This also makes the register updates for the paired-single FPU registers match for emulated MMIO accesses what is done for accesses to normal memory. The new code for accessing normal guest memory uses kvmppc_ld and kvmppc_st, which call kvmppc_xlate, which is only defined for Book 3S. For Book E, kvmppc_handle_load/store still only work for emulated MMIO. Signed-off-by: Paul Mackerras <paulus@xxxxxxxxx>
Please check out my other patch set where I made kvmppc_ld/st available for BookE and also split the MMIO path off completely. Since we do want to take the shortcut through paddr that we only know for memory traps, I really think we're better off treating that whole optimized code path as a separate piece.
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