On Aug 22, 2016 6:53 PM, "Tom Lendacky" <thomas.lendacky@xxxxxxx> wrote:
>
> BOOT data (such as EFI related data) is not encyrpted when the system is
> booted and needs to be accessed as non-encrypted. Add support to the
> early_memremap API to identify the type of data being accessed so that
> the proper encryption attribute can be applied. Currently, two types
> of data are defined, KERNEL_DATA and BOOT_DATA.
What happens when you memremap boot services data outside of early
boot? Matt just added code that does this.
IMO this API is not so great. It scatters a specialized consideration
all over the place. Could early_memremap not look up the PA to figure
out what to do?
--Andy
[leaving the rest here for Matt's benefit]
> unsigned long size,
> + enum memremap_owner owner,
> + pgprot_t prot)
> +{
> + return prot;
> +}
> +
> void __init early_ioremap_reset(void)
> {
> early_ioremap_shutdown();
> @@ -213,16 +221,23 @@ early_ioremap(resource_size_t phys_addr, unsigned long size)
>
> /* Remap memory */
> void __init *
> -early_memremap(resource_size_t phys_addr, unsigned long size)
> +early_memremap(resource_size_t phys_addr, unsigned long size,
> + enum memremap_owner owner)
> {
> - return (__force void *)__early_ioremap(phys_addr, size,
> - FIXMAP_PAGE_NORMAL);
> + pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size, owner,
> + FIXMAP_PAGE_NORMAL);
> +
> + return (__force void *)__early_ioremap(phys_addr, size, prot);
> }
> #ifdef FIXMAP_PAGE_RO
> void __init *
> -early_memremap_ro(resource_size_t phys_addr, unsigned long size)
> +early_memremap_ro(resource_size_t phys_addr, unsigned long size,
> + enum memremap_owner owner)
> {
> - return (__force void *)__early_ioremap(phys_addr, size, FIXMAP_PAGE_RO);
> + pgprot_t prot = early_memremap_pgprot_adjust(phys_addr, size, owner,
> + FIXMAP_PAGE_RO);
> +
> + return (__force void *)__early_ioremap(phys_addr, size, prot);
> }
> #endif
>
> @@ -236,7 +251,8 @@ early_memremap_prot(resource_size_t phys_addr, unsigned long size,
>
> #define MAX_MAP_CHUNK (NR_FIX_BTMAPS << PAGE_SHIFT)
>
> -void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
> +void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size,
> + enum memremap_owner owner)
> {
> unsigned long slop, clen;
> char *p;
> @@ -246,7 +262,7 @@ void __init copy_from_early_mem(void *dest, phys_addr_t src, unsigned long size)
> clen = size;
> if (clen > MAX_MAP_CHUNK - slop)
> clen = MAX_MAP_CHUNK - slop;
> - p = early_memremap(src & PAGE_MASK, clen + slop);
> + p = early_memremap(src & PAGE_MASK, clen + slop, owner);
> memcpy(dest, p + slop, clen);
> early_memunmap(p, clen + slop);
> dest += clen;
> @@ -265,12 +281,14 @@ early_ioremap(resource_size_t phys_addr, unsigned long size)
>
> /* Remap memory */
> void __init *
> -early_memremap(resource_size_t phys_addr, unsigned long size)
> +early_memremap(resource_size_t phys_addr, unsigned long size,
> + enum memremap_owner owner)
> {
> return (void *)phys_addr;
> }
> void __init *
> -early_memremap_ro(resource_size_t phys_addr, unsigned long size)
> +early_memremap_ro(resource_size_t phys_addr, unsigned long size,
> + enum memremap_owner owner)
> {
> return (void *)phys_addr;
> }
>
--
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