[PATCH 4/4] x86/mce: Make usable address checks Intel-only

Borislav Petkov
2015-11-24T07:42:24Z

From: Borislav Petkov <bp@suse.de>

The MCi_MISC bitfield definitions mce_usable_address() checks are
Intel-only. Make them so.

While at it, move mce_usable_address() up, before all its callers and
get rid of the forward declaration.

Signed-off-by: Borislav Petkov <bp@suse.de>
Acked-by: Tony Luck <tony.luck@intel.com>
---
arch/x86/kernel/cpu/mcheck/mce.c | 40 ++++++++++++++++++++++------------------
1 file changed, 22 insertions(+), 18 deletions(-)

diff --git a/arch/x86/kernel/cpu/mcheck/mce.c b/arch/x86/kernel/cpu/mcheck/mce.c
index e00e85ab7387..3865e95cc5ec 100644
--- a/arch/x86/kernel/cpu/mcheck/mce.c
+++ b/arch/x86/kernel/cpu/mcheck/mce.c
@@ -114,7 +114,6 @@ static struct work_struct mce_work;
static struct irq_work mce_irq_work;

static void (*quirk_no_way_out)(int bank, struct mce *m, struct pt_regs *regs);
-static int mce_usable_address(struct mce *m);

/*
* CPU/chipset specific EDAC code can register a notifier call here to print
@@ -475,6 +474,28 @@ static void mce_report_event(struct pt_regs *regs)
irq_work_queue(&mce_irq_work);
}

+/*
+ * Check if the address reported by the CPU is in a format we can parse.
+ * It would be possible to add code for most other cases, but all would
+ * be somewhat complicated (e.g. segment offset would require an instruction
+ * parser). So only support physical addresses up to page granuality for now.
+ */
+static int mce_usable_address(struct mce *m)
+{
+ if (!(m->status & MCI_STATUS_MISCV) || !(m->status & MCI_STATUS_ADDRV))
+ return 0;
+
+ /* Checks after this one are Intel-specific: */
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_INTEL)
+ return 1;
+
+ if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT)
+ return 0;
+ if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS)
+ return 0;
+ return 1;
+}
+
static int srao_decode_notifier(struct notifier_block *nb, unsigned long val,
void *data)
{
@@ -930,23 +951,6 @@ reset:
return ret;
}

-/*
- * Check if the address reported by the CPU is in a format we can parse.
- * It would be possible to add code for most other cases, but all would
- * be somewhat complicated (e.g. segment offset would require an instruction
- * parser). So only support physical addresses up to page granuality for now.
- */
-static int mce_usable_address(struct mce *m)
-{
- if (!(m->status & MCI_STATUS_MISCV) || !(m->status & MCI_STATUS_ADDRV))
- return 0;
- if (MCI_MISC_ADDR_LSB(m->misc) > PAGE_SHIFT)
- return 0;
- if (MCI_MISC_ADDR_MODE(m->misc) != MCI_MISC_ADDR_PHYS)
- return 0;
- return 1;
-}
-
static void mce_clear_state(unsigned long *toclear)
{
int i;
--
2.3.5