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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-4.0-testing] x86/ucode: fix for AMD Fam15 CPUs
# HG changeset patch
# User Christoph Egger <Christoph.Egger@xxxxxxx>
# Date 1326665334 0
# Node ID d5b26918cd94c1d4dbc931d9761ffd9e652ed3c0
# Parent 5d372b8bccefea17a57a887f5828a57ee6adf2b5
x86/ucode: fix for AMD Fam15 CPUs
Remove hardcoded maximum size a microcode patch can have. This is
dynamic now.
The microcode patch for family15h can be larger than 2048 bytes and
gets silently truncated.
Signed-off-by: Christoph Egger <Christoph.Egger@xxxxxxx>
Backport from xen-unstable changeset 24411:ca5f588bd203 to Xen 4.0
---
diff -r 5d372b8bccef -r d5b26918cd94 xen/arch/x86/microcode_amd.c
--- a/xen/arch/x86/microcode_amd.c Sun Dec 18 14:51:04 2011 +0000
+++ b/xen/arch/x86/microcode_amd.c Sun Jan 15 22:08:54 2012 +0000
@@ -33,11 +33,11 @@
#define UCODE_EQUIV_CPU_TABLE_TYPE 0x00000000
#define UCODE_UCODE_TYPE 0x00000001
-#define UCODE_MAX_SIZE (2048)
-#define DEFAULT_UCODE_DATASIZE (896)
-#define MC_HEADER_SIZE (sizeof(struct microcode_header_amd))
-#define DEFAULT_UCODE_TOTALSIZE (DEFAULT_UCODE_DATASIZE + MC_HEADER_SIZE)
-#define DWSIZE (sizeof(uint32_t))
+struct mpbhdr {
+ uint32_t type;
+ uint32_t len;
+ uint8_t data[];
+};
/* serialize access to the physical write */
static DEFINE_SPINLOCK(microcode_update_lock);
@@ -66,10 +66,10 @@
return 0;
}
-static int microcode_fits(void *mc, int cpu)
+static int microcode_fits(const struct microcode_amd *mc_amd, int cpu)
{
struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
- struct microcode_header_amd *mc_header = mc;
+ struct microcode_header_amd *mc_header = mc_amd->mpb;
unsigned int current_cpu_id;
unsigned int equiv_cpu_id = 0x0;
unsigned int i;
@@ -98,9 +98,9 @@
if ( !equiv_cpu_id )
{
- printk(KERN_ERR "microcode: CPU%d cpu_id "
+ printk(KERN_INFO "microcode: CPU%d cpu_id "
"not found in equivalent cpu table\n", cpu);
- return -EINVAL;
+ return 0;
}
if ( (mc_header->processor_rev_id) != equiv_cpu_id )
@@ -112,14 +112,14 @@
}
if ( mc_header->patch_id <= uci->cpu_sig.rev )
- return -EINVAL;
+ return 0;
printk(KERN_INFO "microcode: CPU%d found a matching microcode "
"update with version 0x%x (current=0x%x)\n",
cpu, mc_header->patch_id, uci->cpu_sig.rev);
out:
- return 0;
+ return 1;
}
static int apply_microcode(int cpu)
@@ -128,16 +128,21 @@
struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
uint32_t rev, dummy;
struct microcode_amd *mc_amd = uci->mc.mc_amd;
+ struct microcode_header_amd *hdr;
/* We should bind the task to the CPU */
BUG_ON(raw_smp_processor_id() != cpu);
if ( mc_amd == NULL )
- return -EINVAL;
+ return -EINVAL;
+
+ hdr = mc_amd->mpb;
+ if ( hdr == NULL )
+ return -EINVAL;
spin_lock_irqsave(µcode_update_lock, flags);
- wrmsrl(MSR_AMD_PATCHLOADER, (unsigned long)&mc_amd->hdr.data_code);
+ wrmsrl(MSR_AMD_PATCHLOADER, (unsigned long)hdr);
/* get patch id after patching */
rdmsr(MSR_AMD_PATCHLEVEL, rev, dummy);
@@ -145,61 +150,67 @@
spin_unlock_irqrestore(µcode_update_lock, flags);
/* check current patch id and patch's id for match */
- if ( rev != mc_amd->hdr.patch_id )
+ if ( rev != hdr->patch_id )
{
printk(KERN_ERR "microcode: CPU%d update from revision "
"0x%x to 0x%x failed\n", cpu,
- mc_amd->hdr.patch_id, rev);
+ hdr->patch_id, rev);
return -EIO;
}
printk("microcode: CPU%d updated from revision "
"0x%x to 0x%x \n",
- cpu, uci->cpu_sig.rev, mc_amd->hdr.patch_id);
+ cpu, uci->cpu_sig.rev, hdr->patch_id);
uci->cpu_sig.rev = rev;
return 0;
}
-static int get_next_ucode_from_buffer_amd(void *mc, const void *buf,
- size_t size, unsigned long *offset)
+static int get_next_ucode_from_buffer_amd(struct microcode_amd *mc_amd,
+ const void *buf, size_t bufsize,
+ unsigned long *offset)
{
- struct microcode_header_amd *mc_header;
- size_t total_size;
const uint8_t *bufp = buf;
unsigned long off;
+ const struct mpbhdr *mpbuf;
off = *offset;
/* No more data */
- if ( off >= size )
+ if ( off >= bufsize )
return 1;
- if ( bufp[off] != UCODE_UCODE_TYPE )
+ mpbuf = (const struct mpbhdr *)&bufp[off];
+ if ( mpbuf->type != UCODE_UCODE_TYPE )
{
printk(KERN_ERR "microcode: error! "
"Wrong microcode payload type field\n");
return -EINVAL;
}
- mc_header = (struct microcode_header_amd *)(&bufp[off+8]);
+ printk(KERN_INFO "microcode: size %lu, total_size %u, offset %ld\n",
+ bufsize, mpbuf->len, off);
- total_size = (unsigned long) (bufp[off+4] + (bufp[off+5] << 8));
-
- printk(KERN_INFO "microcode: size %lu, total_size %lu, offset %ld\n",
- (unsigned long)size, total_size, off);
-
- if ( (off + total_size) > size )
+ if ( (off + mpbuf->len) > bufsize )
{
printk(KERN_ERR "microcode: error! Bad data in microcode data file\n");
return -EINVAL;
}
- memset(mc, 0, UCODE_MAX_SIZE);
- memcpy(mc, (const void *)(&bufp[off + 8]), total_size);
+ if (mc_amd->mpb_size < mpbuf->len) {
+ if (mc_amd->mpb) {
+ xfree(mc_amd->mpb);
+ mc_amd->mpb_size = 0;
+ }
+ mc_amd->mpb = xmalloc_bytes(mpbuf->len);
+ if (mc_amd->mpb == NULL)
+ return -ENOMEM;
+ mc_amd->mpb_size = mpbuf->len;
+ }
+ memcpy(mc_amd->mpb, mpbuf->data, mpbuf->len);
- *offset = off + total_size + 8;
+ *offset = off + mpbuf->len + 8;
return 0;
}
@@ -254,7 +265,7 @@
int error = 0;
int ret;
struct ucode_cpu_info *uci = &per_cpu(ucode_cpu_info, cpu);
- void *mc;
+ struct microcode_amd *mc_amd, *mc_old;
/* We should bind the task to the CPU */
BUG_ON(cpu != raw_smp_processor_id());
@@ -275,8 +286,8 @@
return -EINVAL;
}
- mc = xmalloc_bytes(UCODE_MAX_SIZE);
- if ( mc == NULL )
+ mc_amd = xmalloc(struct microcode_amd);
+ if ( mc_amd == NULL )
{
printk(KERN_ERR "microcode: error! "
"Can not allocate memory for microcode patch\n");
@@ -284,32 +295,37 @@
goto out;
}
+ mc_old = uci->mc.mc_amd;
/* implicitely validates uci->mc.mc_valid */
- uci->mc.mc_amd = mc;
+ uci->mc.mc_amd = mc_amd;
/*
* It's possible the data file has multiple matching ucode,
* lets keep searching till the latest version
*/
- while ( (ret = get_next_ucode_from_buffer_amd(mc, buf, size, &offset)) ==
0)
+ mc_amd->mpb = NULL;
+ mc_amd->mpb_size = 0;
+ while ( (ret = get_next_ucode_from_buffer_amd(mc_amd, buf, size,
+ &offset)) == 0)
{
- error = microcode_fits(mc, cpu);
- if (error != 0)
+ error = microcode_fits(mc_amd, cpu);
+ if (error <= 0)
continue;
error = apply_microcode(cpu);
- if (error == 0)
+ if (error == 0) {
+ error = 1;
break;
+ }
}
/* On success keep the microcode patch for
* re-apply on resume.
*/
- if (error) {
- xfree(mc);
- mc = NULL;
+ if (error == 0) {
+ xfree(mc_old);
+ return 0;
}
- uci->mc.mc_amd = mc;
out:
xfree(equiv_cpu_table);
diff -r 5d372b8bccef -r d5b26918cd94 xen/include/asm-x86/microcode.h
--- a/xen/include/asm-x86/microcode.h Sun Dec 18 14:51:04 2011 +0000
+++ b/xen/include/asm-x86/microcode.h Sun Jan 15 22:08:54 2012 +0000
@@ -71,8 +71,8 @@
} __attribute__((packed));
struct microcode_amd {
- struct microcode_header_amd hdr;
- unsigned int mpb[0];
+ void *mpb;
+ size_t mpb_size;
};
struct cpu_signature {
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