linux-kernel - Re: [PATCH v4 5/7] crypto: ccp: Add new SEV/SNP platform shutdown API

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Message-ID: <a6f653d2-a75f-44d0-587a-e57fef0164ad@amd.com>
Date: Thu, 20 Feb 2025 13:21:50 -0600
From: Tom Lendacky <thomas.lendacky@....com>
To: Ashish Kalra <Ashish.Kalra@....com>, seanjc@...gle.com,
 pbonzini@...hat.com, tglx@...utronix.de, mingo@...hat.com, bp@...en8.de,
 dave.hansen@...ux.intel.com, x86@...nel.org, hpa@...or.com,
 john.allen@....com, herbert@...dor.apana.org.au
Cc: michael.roth@....com, dionnaglaze@...gle.com, nikunj@....com,
 ardb@...nel.org, kevinloughlin@...gle.com, Neeraj.Upadhyay@....com,
 aik@....com, kvm@...r.kernel.org, linux-kernel@...r.kernel.org,
 linux-crypto@...r.kernel.org, linux-coco@...ts.linux.dev
Subject: Re: [PATCH v4 5/7] crypto: ccp: Add new SEV/SNP platform shutdown API

On 2/19/25 14:54, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@....com>
> 
> Add new API interface to do SEV/SNP platform shutdown when KVM module
> is unloaded.

Just a nit below if you have to respin. Otherwise:

Reviewed-by: Tom Lendacky <thomas.lendacky@....com>

> 
> Reviewed-by: Dionna Glaze <dionnaglaze@...gle.com>
> Signed-off-by: Ashish Kalra <ashish.kalra@....com>
> ---
>  drivers/crypto/ccp/sev-dev.c | 13 +++++++++++++
>  include/linux/psp-sev.h      |  3 +++
>  2 files changed, 16 insertions(+)
> 
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index 582304638319..f0f3e6d29200 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -2445,6 +2445,19 @@ static void sev_firmware_shutdown(struct sev_device *sev)
>  	mutex_unlock(&sev_cmd_mutex);
>  }
>  
> +void sev_platform_shutdown(void)
> +{
> +	struct sev_device *sev;
> +
> +	if (!psp_master || !psp_master->sev_data)
> +		return;
> +
> +	sev = psp_master->sev_data;
> +
> +	sev_firmware_shutdown(sev);

	sev_firmware_shutdown(psp->master->sev_data);

and then you can get rid of the sev variable.

Thanks,
Tom

> +}
> +EXPORT_SYMBOL_GPL(sev_platform_shutdown);
> +
>  void sev_dev_destroy(struct psp_device *psp)
>  {
>  	struct sev_device *sev = psp->sev_data;
> diff --git a/include/linux/psp-sev.h b/include/linux/psp-sev.h
> index f3cad182d4ef..0b3a36bdaa90 100644
> --- a/include/linux/psp-sev.h
> +++ b/include/linux/psp-sev.h
> @@ -954,6 +954,7 @@ int sev_do_cmd(int cmd, void *data, int *psp_ret);
>  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);
>  
>  #else	/* !CONFIG_CRYPTO_DEV_SP_PSP */
>  
> @@ -988,6 +989,8 @@ static inline void *snp_alloc_firmware_page(gfp_t mask)
>  
>  static inline void snp_free_firmware_page(void *addr) { }
>  
> +static inline void sev_platform_shutdown(void) { }
> +
>  #endif	/* CONFIG_CRYPTO_DEV_SP_PSP */
>  
>  #endif	/* __PSP_SEV_H__ */