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    Subject[PATCH] x86: Adding comments about .iommu_table and its neighbors.
    Date
    Updating the linker section with comments about .iommu_table and
    some other ones that I know of.

    CC: Sam Ravnborg <sam@ravnborg.org>
    CC: H. Peter Anvin <hpa@zytor.com>
    CC: Fujita Tomonori <fujita.tomonori@lab.ntt.co.jp>
    CC: Thomas Gleixner <tglx@linutronix.de>
    CC: Ingo Molnar <mingo@redhat.com>
    Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
    ---
    arch/x86/kernel/vmlinux.lds.S | 22 ++++++++++++++++++++++
    1 files changed, 22 insertions(+), 0 deletions(-)

    diff --git a/arch/x86/kernel/vmlinux.lds.S b/arch/x86/kernel/vmlinux.lds.S
    index b92e040..3f07c37 100644
    --- a/arch/x86/kernel/vmlinux.lds.S
    +++ b/arch/x86/kernel/vmlinux.lds.S
    @@ -242,6 +242,12 @@ SECTIONS
    __x86_cpu_dev_end = .;
    }

    + /*
    + * start address and size of operations which during runtime
    + * can be patched with virtualization friendly instructions or
    + * baremetal native ones. Think page table operations.
    + * Details in paravirt_types.h
    + */
    . = ALIGN(8);
    .parainstructions : AT(ADDR(.parainstructions) - LOAD_OFFSET) {
    __parainstructions = .;
    @@ -249,6 +255,11 @@ SECTIONS
    __parainstructions_end = .;
    }

    + /*
    + * struct alt_inst entries. From the header (alternative.h):
    + * "Alternative instructions for different CPU types or capabilities"
    + * Think locking instructions on spinlocks.
    + */
    . = ALIGN(8);
    .altinstructions : AT(ADDR(.altinstructions) - LOAD_OFFSET) {
    __alt_instructions = .;
    @@ -256,10 +267,21 @@ SECTIONS
    __alt_instructions_end = .;
    }

    + /*
    + * And here are the replacement instructions. The linker sticks
    + * them as binary blobs. The .altinstructions has enough data to
    + * get the address and the length of them to patch the kernel safely.
    + */
    .altinstr_replacement : AT(ADDR(.altinstr_replacement) - LOAD_OFFSET) {
    *(.altinstr_replacement)
    }

    + /*
    + * struct iommu_table_entry entries are injected in this section.
    + * It is an array of IOMMUs which during run time gets sorted depending
    + * on its dependency order. After rootfs_initcall is complete
    + * this section can be safely removed.
    + */
    .iommu_table : AT(ADDR(.iommu_table) - LOAD_OFFSET) {
    __iommu_table = .;
    *(.iommu_table)
    --
    1.7.0.1


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