spapr_numa: use spapr_numa_get_vcpu_assoc() in home_node hcall
The current implementation of h_home_node_associativity hard codes the values of associativity domains of the vcpus. Let's make it consider the values already initialized in spapr->numa_assoc_array, via the spapr_numa_get_vcpu_assoc() helper. We want to set it and forget it, and for that we also need to assert that we don't overflow the registers of the hypercall. >From R4 to R9 we can squeeze in 12 associativity domains for vcpus, so let's assert that VCPU_ASSOC_SIZE -1 isn't greater than that. Reviewed-by: Greg Kurz <groug@kaod.org> Signed-off-by: Daniel Henrique Barboza <danielhb413@gmail.com> Message-Id: <20200904172422.617460-4-danielhb413@gmail.com> Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
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@ -176,10 +176,11 @@ static target_ulong h_home_node_associativity(PowerPCCPU *cpu,
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target_ulong opcode,
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target_ulong *args)
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{
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g_autofree uint32_t *vcpu_assoc = NULL;
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target_ulong flags = args[0];
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target_ulong procno = args[1];
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PowerPCCPU *tcpu;
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int idx;
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int idx, assoc_idx;
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/* only support procno from H_REGISTER_VPA */
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if (flags != 0x1) {
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@ -191,16 +192,40 @@ static target_ulong h_home_node_associativity(PowerPCCPU *cpu,
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return H_P2;
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}
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/* sequence is the same as in the "ibm,associativity" property */
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/*
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* Given that we want to be flexible with the sizes and indexes,
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* we must consider that there is a hard limit of how many
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* associativities domain we can fit in R4 up to R9, which would be
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* 12 associativity domains for vcpus. Assert and bail if that's
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* not the case.
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*/
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G_STATIC_ASSERT((VCPU_ASSOC_SIZE - 1) <= 12);
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vcpu_assoc = spapr_numa_get_vcpu_assoc(spapr, tcpu);
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/* assoc_idx starts at 1 to skip associativity size */
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assoc_idx = 1;
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idx = 0;
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#define ASSOCIATIVITY(a, b) (((uint64_t)(a) << 32) | \
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((uint64_t)(b) & 0xffffffff))
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args[idx++] = ASSOCIATIVITY(0, 0);
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args[idx++] = ASSOCIATIVITY(0, tcpu->node_id);
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args[idx++] = ASSOCIATIVITY(procno, -1);
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for ( ; idx < 6; idx++) {
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args[idx] = -1;
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for (idx = 0; idx < 6; idx++) {
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int32_t a, b;
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/*
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* vcpu_assoc[] will contain the associativity domains for tcpu,
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* including tcpu->node_id and procno, meaning that we don't
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* need to use these variables here.
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*
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* We'll read 2 values at a time to fill up the ASSOCIATIVITY()
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* macro. The ternary will fill the remaining registers with -1
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* after we went through vcpu_assoc[].
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*/
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a = assoc_idx < VCPU_ASSOC_SIZE ?
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be32_to_cpu(vcpu_assoc[assoc_idx++]) : -1;
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b = assoc_idx < VCPU_ASSOC_SIZE ?
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be32_to_cpu(vcpu_assoc[assoc_idx++]) : -1;
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args[idx] = ASSOCIATIVITY(a, b);
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}
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#undef ASSOCIATIVITY
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