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x86/amd_nb: Check vendor in AMD-only functions

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Exit early in functions which are meant to run on AMD only but which get
run on different vendor (VMs, etc).

 [ bp: rewrite commit message. ]

Signed-off-by: Pu Wen <puwen@hygon.cn>
Signed-off-by: Borislav Petkov <bp@suse.de>
Cc: bhelgaas@google.com
Cc: tglx@linutronix.de
Cc: mingo@redhat.com
Cc: hpa@zytor.com
Cc: x86@kernel.org
Cc: thomas.lendacky@amd.com
Cc: helgaas@kernel.org
Link: https://lkml.kernel.org/r/487d8078708baedaf63eb00a82251e228b58f1c2.1537885177.git.puwen@hygon.cn
This commit is contained in:
Pu Wen 2018-09-25 22:45:01 +08:00 committed by Borislav Petkov
parent c3fecca457
commit b7a5cb4f22
2 changed files with 7 additions and 0 deletions
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3
arch/x86/include/asm/amd_nb.h
View File

@ -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))

4
arch/x86/kernel/amd_nb.c
View File

@ -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)