lkml.org 
[lkml]   [2017]   [Jun]   [14]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: [PATCH v6 20/34] x86, mpparse: Use memremap to map the mpf and mpc data
On Wed, Jun 07, 2017 at 02:16:43PM -0500, Tom Lendacky wrote:
> The SMP MP-table is built by UEFI and placed in memory in a decrypted
> state. These tables are accessed using a mix of early_memremap(),
> early_memunmap(), phys_to_virt() and virt_to_phys(). Change all accesses
> to use early_memremap()/early_memunmap(). This allows for proper setting
> of the encryption mask so that the data can be successfully accessed when
> SME is active.
>
> Signed-off-by: Tom Lendacky <thomas.lendacky@amd.com>
> ---
> arch/x86/kernel/mpparse.c | 98 ++++++++++++++++++++++++++++++++-------------
> 1 file changed, 70 insertions(+), 28 deletions(-)

...

> @@ -515,6 +516,12 @@ void __init default_get_smp_config(unsigned int early)
> if (acpi_lapic && acpi_ioapic)
> return;
>
> + mpf = early_memremap(mpf_base, sizeof(*mpf));
> + if (!mpf) {
> + pr_err("MPTABLE: mpf early_memremap() failed\n");

If you're going to introduce new prefixes then add:

#undef pr_fmt
#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt

at the beginning of the file so that they all say "mpparse:" instead.

And pls make that message more user-friendly: "Error mapping MP table"
or so.

--
Regards/Gruss,
Boris.

Good mailing practices for 400: avoid top-posting and trim the reply.

\
 
 \ /
  Last update: 2017-06-14 18:09    [W:0.289 / U:0.720 seconds]
©2003-2020 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site