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Message-ID: <YMiNnN99PuAKbplA@work-vm>
Date: Tue, 15 Jun 2021 12:23:08 +0100
From: "Dr. David Alan Gilbert" <dgilbert@...hat.com>
To: Brijesh Singh <brijesh.singh@....com>
Cc: x86@...nel.org, linux-kernel@...r.kernel.org, kvm@...r.kernel.org,
linux-coco@...ts.linux.dev, linux-mm@...ck.org,
linux-crypto@...r.kernel.org, Thomas Gleixner <tglx@...utronix.de>,
Ingo Molnar <mingo@...hat.com>, Joerg Roedel <jroedel@...e.de>,
Tom Lendacky <thomas.lendacky@....com>,
"H. Peter Anvin" <hpa@...or.com>, Ard Biesheuvel <ardb@...nel.org>,
Paolo Bonzini <pbonzini@...hat.com>,
Sean Christopherson <seanjc@...gle.com>,
Vitaly Kuznetsov <vkuznets@...hat.com>,
Wanpeng Li <wanpengli@...cent.com>,
Jim Mattson <jmattson@...gle.com>,
Andy Lutomirski <luto@...nel.org>,
Dave Hansen <dave.hansen@...ux.intel.com>,
Sergio Lopez <slp@...hat.com>, Peter Gonda <pgonda@...gle.com>,
Peter Zijlstra <peterz@...radead.org>,
Srinivas Pandruvada <srinivas.pandruvada@...ux.intel.com>,
David Rientjes <rientjes@...gle.com>, tony.luck@...el.com,
npmccallum@...hat.com, Borislav Petkov <bp@...e.de>
Subject: Re: [PATCH Part2 RFC v3 14/37] crypto:ccp: Provide APIs to issue
SEV-SNP commands
* Brijesh Singh (brijesh.singh@....com) wrote:
> Provide the APIs for the hypervisor to manage an SEV-SNP guest. The
> commands for SEV-SNP is defined in the SEV-SNP firmware specification.
>
> Signed-off-by: Brijesh Singh <brijesh.singh@....com>
> ---
> drivers/crypto/ccp/sev-dev.c | 24 ++++++++++++
> include/linux/psp-sev.h | 74 ++++++++++++++++++++++++++++++++++++
> 2 files changed, 98 insertions(+)
>
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index b225face37b1..def2996111db 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -1014,6 +1014,30 @@ int sev_guest_df_flush(int *error)
> }
> EXPORT_SYMBOL_GPL(sev_guest_df_flush);
>
> +int snp_guest_decommission(struct sev_data_snp_decommission *data, int *error)
> +{
> + return sev_do_cmd(SEV_CMD_SNP_DECOMMISSION, data, error);
> +}
> +EXPORT_SYMBOL_GPL(snp_guest_decommission);
> +
> +int snp_guest_df_flush(int *error)
> +{
> + return sev_do_cmd(SEV_CMD_SNP_DF_FLUSH, NULL, error);
> +}
> +EXPORT_SYMBOL_GPL(snp_guest_df_flush);
> +
> +int snp_guest_page_reclaim(struct sev_data_snp_page_reclaim *data, int *error)
> +{
> + return sev_do_cmd(SEV_CMD_SNP_PAGE_RECLAIM, data, error);
> +}
> +EXPORT_SYMBOL_GPL(snp_guest_page_reclaim);
> +
> +int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error)
> +{
> + return sev_do_cmd(SEV_CMD_SNP_DBG_DECRYPT, data, error);
> +}
> +EXPORT_SYMBOL_GPL(snp_guest_dbg_decrypt);
> +
> static void sev_exit(struct kref *ref)
> {
> misc_deregister(&misc_dev->misc);
> diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
> index 1b53e8782250..63ef766cbd7a 100644
> --- a/include/linux/psp-sev.h
> +++ b/include/linux/psp-sev.h
> @@ -860,6 +860,65 @@ int sev_guest_df_flush(int *error);
> */
> int sev_guest_decommission(struct sev_data_decommission *data, int *error);
>
> +/**
> + * snp_guest_df_flush - perform SNP DF_FLUSH command
> + *
> + * @sev_ret: sev command return code
> + *
> + * Returns:
> + * 0 if the sev successfully processed the command
> + * -%ENODEV if the sev device is not available
> + * -%ENOTSUPP if the sev does not support SEV
sev not supporting SEV? Is that actually 'sev does not support SNP'?
> + * -%ETIMEDOUT if the sev command timed out
> + * -%EIO if the sev returned a non-zero return code
> + */
> +int snp_guest_df_flush(int *error);
> +
> +/**
> + * snp_guest_decommission - perform SNP_DECOMMISSION command
> + *
> + * @decommission: sev_data_decommission structure to be processed
> + * @sev_ret: sev command return code
> + *
> + * Returns:
> + * 0 if the sev successfully processed the command
> + * -%ENODEV if the sev device is not available
> + * -%ENOTSUPP if the sev does not support SEV
> + * -%ETIMEDOUT if the sev command timed out
> + * -%EIO if the sev returned a non-zero return code
> + */
> +int snp_guest_decommission(struct sev_data_snp_decommission *data, int *error);
> +
> +/**
> + * snp_guest_page_reclaim - perform SNP_PAGE_RECLAIM command
> + *
> + * @decommission: sev_snp_page_reclaim structure to be processed
> + * @sev_ret: sev command return code
> + *
> + * Returns:
> + * 0 if the sev successfully processed the command
> + * -%ENODEV if the sev device is not available
> + * -%ENOTSUPP if the sev does not support SEV
> + * -%ETIMEDOUT if the sev command timed out
> + * -%EIO if the sev returned a non-zero return code
> + */
> +int snp_guest_page_reclaim(struct sev_data_snp_page_reclaim *data, int *error);
> +
> +/**
> + * snp_guest_dbg_decrypt - perform SEV SNP_DBG_DECRYPT command
> + *
> + * @sev_ret: sev command return code
> + *
> + * Returns:
> + * 0 if the sev successfully processed the command
> + * -%ENODEV if the sev device is not available
> + * -%ENOTSUPP if the sev does not support SEV
> + * -%ETIMEDOUT if the sev command timed out
> + * -%EIO if the sev returned a non-zero return code
> + */
> +int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error);
> +
> +
> void *psp_copy_user_blob(u64 uaddr, u32 len);
>
> #else /* !CONFIG_CRYPTO_DEV_SP_PSP */
> @@ -887,6 +946,21 @@ sev_issue_cmd_external_user(struct file *filep, unsigned int id, void *data, int
>
> static inline void *psp_copy_user_blob(u64 __user uaddr, u32 len) { return ERR_PTR(-EINVAL); }
>
> +static inline int
> +snp_guest_decommission(struct sev_data_snp_decommission *data, int *error) { return -ENODEV; }
> +
> +static inline int snp_guest_df_flush(int *error) { return -ENODEV; }
> +
> +static inline int snp_guest_page_reclaim(struct sev_data_snp_page_reclaim *data, int *error)
> +{
> + return -ENODEV;
> +}
> +
> +static inline int snp_guest_dbg_decrypt(struct sev_data_snp_dbg *data, int *error)
> +{
> + return -ENODEV;
> +}
> +
> #endif /* CONFIG_CRYPTO_DEV_SP_PSP */
>
> #endif /* __PSP_SEV_H__ */
> --
> 2.17.1
>
>
--
Dr. David Alan Gilbert / dgilbert@...hat.com / Manchester, UK
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