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[v4,3/7] crypto: ccp: Reset TMR size at SNP Shutdown

Message ID e13263246be91e4e0073b4c81d4d9e2fc41a6e1d.1739997129.git.ashish.kalra@amd.com (mailing list archive)
State New
Headers show
Series Move initializing SEV/SNP functionality to KVM | expand

Commit Message

Kalra, Ashish Feb. 19, 2025, 8:53 p.m. UTC 
From: Ashish Kalra <ashish.kalra@amd.com>

When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB sized,
ensure that TMR size is reset back to default when SNP is shutdown as
SNP initialization and shutdown as part of some SNP ioctls may leave
TMR size modified and cause subsequent SEV only initialization to fail.

Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
---
 drivers/crypto/ccp/sev-dev.c | 3 +++
 1 file changed, 3 insertions(+)

Comments

Dionna Amalie Glaze Feb. 20, 2025, 4:47 p.m. UTC | #1 
On Wed, Feb 19, 2025 at 12:53 PM Ashish Kalra <Ashish.Kalra@amd.com> wrote:
>
> From: Ashish Kalra <ashish.kalra@amd.com>
>
> When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB sized,
> ensure that TMR size is reset back to default when SNP is shutdown as
> SNP initialization and shutdown as part of some SNP ioctls may leave
> TMR size modified and cause subsequent SEV only initialization to fail.
>
> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>

Acked-by: Dionna Glaze <dionnaglaze@google.com>

> ---
>  drivers/crypto/ccp/sev-dev.c | 3 +++
>  1 file changed, 3 insertions(+)
>
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index b06f43eb18f7..be8a84ce24c7 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -1751,6 +1751,9 @@ static int __sev_snp_shutdown_locked(int *error, bool panic)
>         sev->snp_initialized = false;
>         dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n");
>
> +       /* Reset TMR size back to default */
> +       sev_es_tmr_size = SEV_TMR_SIZE;
> +
>         return ret;
>  }
>
> --
> 2.34.1
>
Tom Lendacky Feb. 20, 2025, 6:55 p.m. UTC | #2 
On 2/19/25 14:53, Ashish Kalra wrote:
> From: Ashish Kalra <ashish.kalra@amd.com>
> 
> When SEV-SNP is enabled the TMR needs to be 2MB aligned and 2MB sized,
> ensure that TMR size is reset back to default when SNP is shutdown as
> SNP initialization and shutdown as part of some SNP ioctls may leave
> TMR size modified and cause subsequent SEV only initialization to fail.

This is a long run-on sentence, please re-work this to make it more
informative and clear as to what the issue is.

Other than that,

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

> 
> Signed-off-by: Ashish Kalra <ashish.kalra@amd.com>
> ---
>  drivers/crypto/ccp/sev-dev.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
> index b06f43eb18f7..be8a84ce24c7 100644
> --- a/drivers/crypto/ccp/sev-dev.c
> +++ b/drivers/crypto/ccp/sev-dev.c
> @@ -1751,6 +1751,9 @@ static int __sev_snp_shutdown_locked(int *error, bool panic)
>  	sev->snp_initialized = false;
>  	dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n");
>  
> +	/* Reset TMR size back to default */
> +	sev_es_tmr_size = SEV_TMR_SIZE;
> +
>  	return ret;
>  }
>
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Patch

diff --git a/drivers/crypto/ccp/sev-dev.c b/drivers/crypto/ccp/sev-dev.c
index b06f43eb18f7..be8a84ce24c7 100644
--- a/drivers/crypto/ccp/sev-dev.c
+++ b/drivers/crypto/ccp/sev-dev.c
@@ -1751,6 +1751,9 @@  static int __sev_snp_shutdown_locked(int *error, bool panic)
 	sev->snp_initialized = false;
 	dev_dbg(sev->dev, "SEV-SNP firmware shutdown\n");
 
+	/* Reset TMR size back to default */
+	sev_es_tmr_size = SEV_TMR_SIZE;
+
 	return ret;
 }