On 29.07.2019 19:38, Andrew Cooper wrote:
> --- a/xen/arch/x86/traps.c
> +++ b/xen/arch/x86/traps.c
> @@ -108,6 +108,12 @@ idt_entry_t __section(".bss.page_aligned")
> __aligned(PAGE_SIZE)
> /* Pointer to the IDT of every CPU. */
> idt_entry_t *idt_tables[NR_CPUS] __read_mostly;
>
> +/*
> + * The TSS is smaller than a page, but we give it a full page to avoid
> + * adjacent per-cpu data leaking via Meltdown when XPTI is in use.
> + */
> +DEFINE_PER_CPU_PAGE_ALIGNED(struct tss_struct, init_tss);
I assume there's a reason why you didn't introduce a wrapper
union to pad this to page size - I'd like to understand this
reason (see also my reply to patch 1) before acking both
patches.
Jan
_______________________________________________
Xen-devel mailing list
Xen-devel@lists.xenproject.org
https://lists.xenproject.org/mailman/listinfo/xen-devel
