The interrupt stack table (IST) mechanism is the only thing preventing kvm from deferring saving and reloading of some significant state. It is also somewhat complicated.
Remove it by switching the special exceptions to use the normal irqstack. Changes from v1: - rebase on tip/master - as a step, consolidate stack switching into a single macro Jeremy, Xen is also affected; please review. Avi Kivity (4): x86: drop the use of the tss interrupt stack table (IST) x86: Consolidate irq stack switching to a single macro x86: Make interrupt stack switching atomic x86: Move NMI back to interrupt stack arch/x86/include/asm/desc.h | 12 ----- arch/x86/include/asm/page_64.h | 7 --- arch/x86/include/asm/pda.h | 2 +- arch/x86/include/asm/processor.h | 11 ---- arch/x86/kernel/asm-offsets_64.c | 1 - arch/x86/kernel/cpu/common.c | 35 -------------- arch/x86/kernel/dumpstack_64.c | 96 -------------------------------------- arch/x86/kernel/entry_64.S | 89 ++++++++++------------------------- arch/x86/kernel/traps.c | 12 ++-- 9 files changed, 33 insertions(+), 232 deletions(-) -- To unsubscribe from this list: send the line "unsubscribe kvm" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
