linux-kernel - Re: [PATCH v13 5/6] KVM: s390: pv: support for Destroy fast UVC

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Date:   Fri, 19 Aug 2022 12:01:09 +0200
From:   Janosch Frank <frankja@...ux.ibm.com>
To:     Claudio Imbrenda <imbrenda@...ux.ibm.com>, kvm@...r.kernel.org
Cc:     borntraeger@...ibm.com, thuth@...hat.com, pasic@...ux.ibm.com,
        david@...hat.com, linux-s390@...r.kernel.org,
        linux-kernel@...r.kernel.org, scgl@...ux.ibm.com,
        seiden@...ux.ibm.com, nrb@...ux.ibm.com
Subject: Re: [PATCH v13 5/6] KVM: s390: pv: support for Destroy fast UVC

On 8/10/22 14:56, Claudio Imbrenda wrote:
> Add support for the Destroy Secure Configuration Fast Ultravisor call,
> and take advantage of it for asynchronous destroy.
> 
> When supported, the protected guest is destroyed immediately using the
> new UVC, leaving only the memory to be cleaned up asynchronously.
> 
> Signed-off-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

Reviewed-by: Janosch Frank <frankja@...ux.ibm.com>

> ---
>   arch/s390/include/asm/uv.h | 10 +++++++
>   arch/s390/kvm/pv.c         | 57 ++++++++++++++++++++++++++++++++------
>   2 files changed, 59 insertions(+), 8 deletions(-)
> 
> diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h
> index be3ef9dd6972..28a9ad57b6f1 100644
> --- a/arch/s390/include/asm/uv.h
> +++ b/arch/s390/include/asm/uv.h
> @@ -34,6 +34,7 @@
>   #define UVC_CMD_INIT_UV			0x000f
>   #define UVC_CMD_CREATE_SEC_CONF		0x0100
>   #define UVC_CMD_DESTROY_SEC_CONF	0x0101
> +#define UVC_CMD_DESTROY_SEC_CONF_FAST	0x0102
>   #define UVC_CMD_CREATE_SEC_CPU		0x0120
>   #define UVC_CMD_DESTROY_SEC_CPU		0x0121
>   #define UVC_CMD_CONV_TO_SEC_STOR	0x0200
> @@ -81,6 +82,7 @@ enum uv_cmds_inst {
>   	BIT_UVC_CMD_UNSHARE_ALL = 20,
>   	BIT_UVC_CMD_PIN_PAGE_SHARED = 21,
>   	BIT_UVC_CMD_UNPIN_PAGE_SHARED = 22,
> +	BIT_UVC_CMD_DESTROY_SEC_CONF_FAST = 23,
>   	BIT_UVC_CMD_DUMP_INIT = 24,
>   	BIT_UVC_CMD_DUMP_CONFIG_STOR_STATE = 25,
>   	BIT_UVC_CMD_DUMP_CPU = 26,
> @@ -230,6 +232,14 @@ struct uv_cb_nodata {
>   	u64 reserved20[4];
>   } __packed __aligned(8);
>   
> +/* Destroy Configuration Fast */
> +struct uv_cb_destroy_fast {
> +	struct uv_cb_header header;
> +	u64 reserved08[2];
> +	u64 handle;
> +	u64 reserved20[5];
> +} __packed __aligned(8);