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Subject[PATCH 1/2] x86/amd_nb: Add vendor checking for strict function access
Date
To prevent further PCI device ids checking in early_gart_iommu_check
which cannot happen both on Hygon and Intel platform, the function
amd_gart_present should return if it's not a AMD CPU.

Also only AMD or Hygon CPU should use the functionality provided by
early_is_amd_nb.

Signed-off-by: Pu Wen <puwen@hygon.cn>
---
arch/x86/include/asm/amd_nb.h | 3 +++
arch/x86/kernel/amd_nb.c | 4 ++++
2 files changed, 7 insertions(+)

diff --git a/arch/x86/include/asm/amd_nb.h b/arch/x86/include/asm/amd_nb.h
index fddb6d2..1ae4e57 100644
--- a/arch/x86/include/asm/amd_nb.h
+++ b/arch/x86/include/asm/amd_nb.h
@@ -103,6 +103,9 @@ static inline u16 amd_pci_dev_to_node_id(struct pci_dev *pdev)

static inline bool amd_gart_present(void)
{
+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD)
+ return false;
+
/* GART present only on Fam15h, upto model 0fh */
if (boot_cpu_data.x86 == 0xf || boot_cpu_data.x86 == 0x10 ||
(boot_cpu_data.x86 == 0x15 && boot_cpu_data.x86_model < 0x10))
diff --git a/arch/x86/kernel/amd_nb.c b/arch/x86/kernel/amd_nb.c
index b481b95..b51c6b1 100644
--- a/arch/x86/kernel/amd_nb.c
+++ b/arch/x86/kernel/amd_nb.c
@@ -264,6 +264,10 @@ bool __init early_is_amd_nb(u32 device)
const struct pci_device_id *id;
u32 vendor = device & 0xffff;

+ if (boot_cpu_data.x86_vendor != X86_VENDOR_AMD &&
+ boot_cpu_data.x86_vendor != X86_VENDOR_HYGON)
+ return false;
+
device >>= 16;
for (id = amd_nb_misc_ids; id->vendor; id++)
if (vendor == id->vendor && device == id->device)
--
2.7.4
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