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@@ -239,6 +239,25 @@ __initcall(register_memory);
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#ifdef CONFIG_KEXEC
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+
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+/*
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+ * This function checks if the reserved crashkernel is allowed on the specific
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+ * IA64 machine flavour. Machines without an IO TLB use swiotlb and require
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+ * some memory below 4 GB (i.e. in 32 bit area), see the implementation of
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+ * lib/swiotlb.c. The hpzx1 architecture has an IO TLB but cannot use that
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+ * in kdump case. See the comment in sba_init() in sba_iommu.c.
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+ *
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+ * So, the only machvec that really supports loading the kdump kernel
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+ * over 4 GB is "sn2".
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+ */
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+static int __init check_crashkernel_memory(unsigned long pbase, size_t size)
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+{
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+ if (ia64_platform_is("sn2") || ia64_platform_is("uv"))
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+ return 1;
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+ else
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+ return pbase < (1UL << 32);
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+}
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+
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static void __init setup_crashkernel(unsigned long total, int *n)
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{
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unsigned long long base = 0, size = 0;
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@@ -252,6 +271,16 @@ static void __init setup_crashkernel(unsigned long total, int *n)
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base = kdump_find_rsvd_region(size,
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rsvd_region, *n);
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}
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+
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+ if (!check_crashkernel_memory(base, size)) {
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+ pr_warning("crashkernel: There would be kdump memory "
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+ "at %ld GB but this is unusable because it "
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+ "must\nbe below 4 GB. Change the memory "
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+ "configuration of the machine.\n",
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+ (unsigned long)(base >> 30));
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+ return;
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+ }
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+
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if (base != ~0UL) {
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printk(KERN_INFO "Reserving %ldMB of memory at %ldMB "
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"for crashkernel (System RAM: %ldMB)\n",
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