On 3/18/25 15:07, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@xxxxxxx>
>
> If SNP host support (SYSCFG.SNPEn) is set, then the RMP table must
> be initialized before calling SEV INIT.
>
> In other words, if SNP_INIT(_EX) is not issued or fails then
> SEV INIT will fail if SNP host support (SYSCFG.SNPEn) is enabled.
>
> Fixes: 1ca5614b84eed ("crypto: ccp: Add support to initialize the AMD-SP for SEV-SNP")
Just wondering if this really needs a Fixes: tag. Either way SNP and SEV
won't be initialized, you're just returning earlier with an error code
rather than attempting the SEV_INIT(_EX) and getting back a failing
error code.
Thanks,
Tom
> Signed-off-by: Ashish Kalra <ashish.kalra@xxxxxxx>
>
> v2:
> - Fix commit logs.
> ---
> drivers/crypto/ccp/sev-dev.c | 7 ++-----
> 1 file changed, 2 insertions(+), 5 deletions(-)
>
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index 2e87ca0e292a..a0e3de94704e 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -1112,7 +1112,7 @@ static int __sev_snp_init_locked(int *error)
> if (!sev_version_greater_or_equal(SNP_MIN_API_MAJOR, SNP_MIN_API_MINOR)) {
> dev_dbg(sev->dev, "SEV-SNP support requires firmware version >= %d:%d\n",
> SNP_MIN_API_MAJOR, SNP_MIN_API_MINOR);
> - return 0;
> + return -EOPNOTSUPP;
> }
>
> /* SNP_INIT requires MSR_VM_HSAVE_PA to be cleared on all CPUs. */
> @@ -1325,12 +1325,9 @@ static int _sev_platform_init_locked(struct sev_platform_init_args *args)
> */
> rc = __sev_snp_init_locked(&args->error);
> if (rc && rc != -ENODEV) {
> - /*
> - * Don't abort the probe if SNP INIT failed,
> - * continue to initialize the legacy SEV firmware.
> - */
> dev_err(sev->dev, "SEV-SNP: failed to INIT rc %d, error %#x\n",
> rc, args->error);
> + return rc;
> }
>
> /* Defer legacy SEV/SEV-ES support if allowed by caller/module. */
