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virt/coco/sev-guest: Check SEV_SNP attribute at probe time 

No need to check it on every ioctl. And yes, this is a common SEV driver
but it does only SNP-specific operations currently. This can be
revisited later, when more use cases appear.

No functional changes.

Signed-off-by: Borislav Petkov (AMD) <bp@alien8.de>
Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>
Link: https://lore.kernel.org/r/20230307192449.24732-3-bp@alien8.de
This commit is contained in:
Borislav Petkov (AMD) 2023-02-15 11:01:42 +01:00
parent eeac8ede17
commit d6fd48eff7
2 changed files with 3 additions and 3 deletions
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3
arch/x86/kernel/sev.c
View File

@ -2183,9 +2183,6 @@ int snp_issue_guest_request(u64 exit_code, struct snp_req_data *input, unsigned
struct ghcb *ghcb;
int ret;
if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return -ENODEV;
if (!fw_err)
return -EINVAL;

3
drivers/virt/coco/sev-guest/sev-guest.c
View File

@ -703,6 +703,9 @@ static int __init sev_guest_probe(struct platform_device *pdev)
void __iomem *mapping;
int ret;
if (!cc_platform_has(CC_ATTR_GUEST_SEV_SNP))
return -ENODEV;
if (!dev->platform_data)
return -ENODEV;