This hypercall either initializes a page with zeros, or copies another page. According to LoPAPR, the i-cache of the page should also be flushed when using H_ICACHE_INVALIDATE or H_ICACHE_SYNCHRONIZE, but this is currently only done when running with TCG - assuming the cache will be flushed with KVM anyway when switching back to kernel / VM context. The code currently also does not explicitely flush the data cache with H_ICACHE_SYNCHRONIZE, since this either also should be done when switching back to kernel / VM context (with KVM), or not matter anyway (for TCG).
Signed-off-by: Thomas Huth <[email protected]> --- hw/ppc/spapr_hcall.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) diff --git a/hw/ppc/spapr_hcall.c b/hw/ppc/spapr_hcall.c index f14f849..91e703d 100644 --- a/hw/ppc/spapr_hcall.c +++ b/hw/ppc/spapr_hcall.c @@ -387,6 +387,47 @@ static target_ulong h_set_xdabr(PowerPCCPU *cpu, sPAPRMachineState *spapr, return H_SUCCESS; } +static target_ulong h_page_init(PowerPCCPU *cpu, sPAPRMachineState *spapr, + target_ulong opcode, target_ulong *args) +{ + target_ulong flags = args[0]; + target_ulong dest = args[1]; + target_ulong src = args[2]; + uint8_t buf[TARGET_PAGE_SIZE]; + + if (flags & ~(H_ICACHE_SYNCHRONIZE | H_ICACHE_INVALIDATE + | H_COPY_PAGE | H_ZERO_PAGE)) { + qemu_log_mask(LOG_UNIMP, "h_page_init: Bad flags (" TARGET_FMT_lx "\n", + flags); + } + + if (!is_ram_address(spapr, dest) || (dest & ~TARGET_PAGE_MASK) != 0) { + return H_PARAMETER; + } + + if (flags & H_COPY_PAGE) { + if (!is_ram_address(spapr, src) || (src & ~TARGET_PAGE_MASK) != 0) { + return H_PARAMETER; + } + cpu_physical_memory_read(src, buf, TARGET_PAGE_SIZE); + } else if (flags & H_ZERO_PAGE) { + memset(buf, 0, TARGET_PAGE_SIZE); + } + + if (flags & (H_COPY_PAGE | H_ZERO_PAGE)) { + cpu_physical_memory_write(dest, buf, TARGET_PAGE_SIZE); + } + + if (flags & (H_ICACHE_SYNCHRONIZE | H_ICACHE_INVALIDATE)) { + if (tcg_enabled()) { + tb_flush(CPU(cpu)); + } + /* XXX: Flush data cache for H_ICACHE_SYNCHRONIZE? */ + } + + return H_SUCCESS; +} + #define FLAGS_REGISTER_VPA 0x0000200000000000ULL #define FLAGS_REGISTER_DTL 0x0000400000000000ULL #define FLAGS_REGISTER_SLBSHADOW 0x0000600000000000ULL @@ -1046,6 +1087,7 @@ static void hypercall_register_types(void) spapr_register_hypercall(H_SET_SPRG0, h_set_sprg0); spapr_register_hypercall(H_SET_DABR, h_set_dabr); spapr_register_hypercall(H_SET_XDABR, h_set_xdabr); + spapr_register_hypercall(H_PAGE_INIT, h_page_init); spapr_register_hypercall(H_SET_MODE, h_set_mode); /* "debugger" hcalls (also used by SLOF). Note: We do -not- differenciate -- 1.8.3.1
