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Date: Thu, 20 Jun 2013 10:24:14 -0500
From: Jacob Shin <jacob.shin@....com>
To: Ingo Molnar <mingo@...nel.org>
CC: "H. Peter Anvin" <hpa@...or.com>, Ingo Molnar <mingo@...hat.com>,
Thomas Gleixner <tglx@...utronix.de>,
Yinghai Lu <yinghai@...nel.org>,
Henrique de Moraes Holschuh <hmh@....eng.br>,
Borislav Petkov <bp@...en8.de>,
Andreas Herrmann <herrmann.der.user@...glemail.com>,
<x86@...nel.org>, <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH V3 0/2] x86/microcode/amd: early loading fixes
On Thu, Jun 20, 2013 at 10:16:16AM -0500, Jacob Shin wrote:
> On Thu, Jun 20, 2013 at 12:30:53PM +0200, Ingo Molnar wrote:
> >
> > * Jacob Shin <jacob.shin@....com> wrote:
> >
> > > On Fri, Jun 07, 2013 at 09:22:18PM -0500, Jacob Shin wrote:
> > > > This patchset addreses two problems with early loading on AMD.
> > > >
> > > > First, feedback from Yinghai that find_ucode_in_initrd() should be
> > > > marked __init:
> > > > https://lkml.org/lkml/2013/6/4/695
> > > >
> > > > And second, feedback from Henrique that Intel early loading supports
> > > > multiple microcode firmware concatenated together, whereas the current
> > > > AMD implementation lacks this support:
> > > > https://lkml.org/lkml/2013/5/31/4
> > > >
> > > > V3:
> > > > * style fix -- reduce multiple if statements into a single one
> > >
> > > Hi hpa or Yinghai, just wondering if you had the chance to look at this
> > > V3 yet.
> >
> > It appears Peter applied v2 to tip:x86/microcode two days before you sent
> > v3 - please send any changes in v3 as delta patches.
>
> I actually recieved the tip-bot email <https://lkml.org/lkml/2013/6/12/468>
> couple of days after sending out the above message, so I assumed that
> V3 was committed in.
>
> I should have read the tip-bot message thoroughly and noticed
> it. Sorry about that. Here is the delta patch:
Sigh :-( .. sorry, forgot to sign off. Here it is again:
---8<---
>From 1445587da716b306f39feef46fb7150f292060c7 Mon Sep 17 00:00:00 2001
From: Jacob Shin <jacob.shin@....com>
Date: Thu, 20 Jun 2013 09:52:50 -0500
Subject: [PATCH] x86, microcode, amd: another early loading fixup
commit cd1c32ca969ebfd65e61312c988223bb14f09c2e is an early premature
rendition of the patch. Augment it with this delta patch to:
* correctly mark offset and size of the matching bin file
* use __pa instead of __pa_nodebug during AP load
* check for !initrd_start before using it
Signed-off-by: Jacob Shin <jacob.shin@....com>
---
arch/x86/kernel/microcode_amd_early.c | 40 ++++++++++++++++++++-------------
1 file changed, 24 insertions(+), 16 deletions(-)
diff --git a/arch/x86/kernel/microcode_amd_early.c b/arch/x86/kernel/microcode_amd_early.c
index 4c593c2..1ac6e9a 100644
--- a/arch/x86/kernel/microcode_amd_early.c
+++ b/arch/x86/kernel/microcode_amd_early.c
@@ -143,13 +143,17 @@ static void __cpuinit apply_ucode_in_initrd(void *ucode, size_t size)
left -= offset;
}
- offset = data - (u8 *)ucode;
+ /* mark where the next microcode container file starts */
+ offset = data - (u8 *)ucode;
*uoffset += offset;
*usize -= offset;
+ ucode = data;
}
- if (!eq_id)
+ if (!eq_id) {
+ *usize = 0;
return;
+ }
/* find ucode and update if needed */
@@ -166,15 +170,21 @@ static void __cpuinit apply_ucode_in_initrd(void *ucode, size_t size)
mc = (struct microcode_amd *)(data + SECTION_HDR_SIZE);
if (eq_id == mc->hdr.processor_rev_id && rev < mc->hdr.patch_id)
if (__apply_microcode_amd(mc) == 0) {
- if (!(*new_rev))
- *new_rev = mc->hdr.patch_id;
- break;
+ rev = mc->hdr.patch_id;
+ *new_rev = rev;
}
offset = header[1] + SECTION_HDR_SIZE;
data += offset;
left -= offset;
}
+
+ /* mark where this microcode container file ends */
+ offset = *usize - (data - (u8 *)ucode);
+ *usize -= offset;
+
+ if (!(*new_rev))
+ *usize = 0;
}
void __init load_ucode_amd_bsp(void)
@@ -204,19 +214,20 @@ void __cpuinit load_ucode_amd_ap(void)
size_t *usize;
void *ucode;
- mc = (struct microcode_amd *)__pa_nodebug(amd_bsp_mpb);
+ mc = (struct microcode_amd *)__pa(amd_bsp_mpb);
if (mc->hdr.patch_id && mc->hdr.processor_rev_id) {
__apply_microcode_amd(mc);
return;
}
- initrd = (unsigned long *)__pa_nodebug(&initrd_start);
- uoffset = (unsigned long *)__pa_nodebug(&ucode_offset);
- usize = (size_t *)__pa_nodebug(&ucode_size);
- if (!*usize)
+ initrd = (unsigned long *)__pa(&initrd_start);
+ uoffset = (unsigned long *)__pa(&ucode_offset);
+ usize = (size_t *)__pa(&ucode_size);
+
+ if (!*usize || !*initrd)
return;
- ucode = (void *)((unsigned long)__pa_nodebug(*initrd) + *uoffset);
+ ucode = (void *)((unsigned long)__pa(*initrd) + *uoffset);
apply_ucode_in_initrd(ucode, *usize);
}
@@ -250,7 +261,7 @@ void __cpuinit load_ucode_amd_ap(void)
if (cpu && !ucode_loaded) {
void *ucode;
- if (!ucode_size)
+ if (!ucode_size || !initrd_start)
return;
ucode = (void *)(initrd_start + ucode_offset);
@@ -278,10 +289,7 @@ int __init save_microcode_in_initrd_amd(void)
pr_info("microcode: updated early to new patch_level=0x%08x\n",
ucode_new_rev);
- if (ucode_loaded)
- return 0;
-
- if (!ucode_size)
+ if (ucode_loaded || !ucode_size || !initrd_start)
return 0;
ucode = (void *)(initrd_start + ucode_offset);
--
1.7.9.5
--
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