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> } > > +bool sev_is_snp_ciphertext_hiding_supported(void) > +{ > + struct psp_device *psp = psp_master; > + struct sev_device *sev; > + > + if (!psp || !psp->sev_data) > + return false; > + > + sev = psp->sev_data; > + > + /* > + * Feature information indicates if CipherTextHiding feature is > + * supported by the SEV firmware and additionally platform status > + * indicates if CipherTextHiding feature is enabled in the > + * Platform BIOS. > + */ > + return ((sev->snp_feat_info_0.ecx & SNP_CIPHER_TEXT_HIDING_SUPPORTED) && > + sev->snp_plat_status.ciphertext_hiding_cap); > +} > +EXPORT_SYMBOL_GPL(sev_is_snp_ciphertext_hiding_supported); > + > static int snp_get_platform_data(struct sev_device *sev, int *error) > { > struct sev_data_snp_feature_info snp_feat_info; > diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h > index 5fb6ae0f51cc..d83185b4268b 100644 > --- a/include/linux/psp-sev.h > +++ b/include/linux/psp-sev.h > @@ -843,6 +843,8 @@ struct snp_feature_info { > u32 edx; > } __packed; > > +#define SNP_CIPHER_TEXT_HIDING_SUPPORTED BIT(3) > + > #ifdef CONFIG_CRYPTO_DEV_SP_PSP > > /** > @@ -986,6 +988,7 @@ void *psp_copy_user_blob(u64 uaddr, u32 len); > void *snp_alloc_firmware_page(gfp_t mask); > void snp_free_firmware_page(void *addr); > void sev_platform_shutdown(void); > +bool sev_is_snp_ciphertext_hiding_supported(void); > > #else /* !CONFIG_CRYPTO_DEV_SP_PSP */ > > @@ -1022,6 +1025,8 @@ static inline void snp_free_firmware_page(void *addr) { } > > static inline void sev_platform_shutdown(void) { } > > +static inline bool sev_is_snp_ciphertext_hiding_supported(void) { return false; } > + > #endif /* CONFIG_CRYPTO_DEV_SP_PSP */ > > #endif /* __PSP_SEV_H__ */