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From: Samuel Thibault <samuel.thibault@ens-lyon.org>
To: Jason Andryuk <jandryuk@gmail.com>
Cc: xen-devel@lists.xenproject.org,
	Daniel De Graaf <dgdegra@tycho.nsa.gov>,
	Quan Xu <quan.xu0@gmail.com>
Subject: Re: [PATCH 8/9] vtpmmgr: Shutdown more gracefully
Date: Tue, 4 May 2021 15:18:42 +0200	[thread overview]
Message-ID: <20210504131842.cas3s2rpd4cvr46q@begin> (raw)
In-Reply-To: <20210504124842.220445-9-jandryuk@gmail.com>

Jason Andryuk, le mar. 04 mai 2021 08:48:41 -0400, a ecrit:
> vtpmmgr uses the default, weak app_shutdown, which immediately calls the
> shutdown hypercall.  This short circuits the vtpmmgr clean up logic.  We
> need to perform the clean up to actually Flush our key out of the tpm.
> 
> Setting do_shutdown is one step in that direction, but vtpmmgr will most
> likely be waiting in tpmback_req_any.  We need to call shutdown_tpmback
> to cancel the wait inside tpmback and perform the shutdown.
> 
> Signed-off-by: Jason Andryuk <jandryuk@gmail.com>

Reviewed-by: Samuel Thibault <samuel.thibaut@ens-lyon.org>

> ---
>  stubdom/vtpmmgr/vtpmmgr.c | 12 +++++++++++-
>  1 file changed, 11 insertions(+), 1 deletion(-)
> 
> diff --git a/stubdom/vtpmmgr/vtpmmgr.c b/stubdom/vtpmmgr/vtpmmgr.c
> index 9fddaa24f8..46ea018921 100644
> --- a/stubdom/vtpmmgr/vtpmmgr.c
> +++ b/stubdom/vtpmmgr/vtpmmgr.c
> @@ -67,11 +67,21 @@ int hw_is_tpm2(void)
>      return (hardware_version.hw_version == TPM2_HARDWARE) ? 1 : 0;
>  }
>  
> +static int do_shutdown;
> +
> +void app_shutdown(unsigned int reason)
> +{
> +    printk("Shutdown requested: %d\n", reason);
> +    do_shutdown = 1;
> +
> +    shutdown_tpmback();
> +}
> +
>  void main_loop(void) {
>     tpmcmd_t* tpmcmd;
>     uint8_t respbuf[TCPA_MAX_BUFFER_LENGTH];
>  
> -   while(1) {
> +   while (!do_shutdown) {
>        /* Wait for requests from a vtpm */
>        vtpmloginfo(VTPM_LOG_VTPM, "Waiting for commands from vTPM's:\n");
>        if((tpmcmd = tpmback_req_any()) == NULL) {
> -- 
> 2.30.2
> 


  reply	other threads:[~2021-05-04 13:19 UTC|newest]

Thread overview: 30+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2021-05-04 12:48 [PATCH 0/9] vtpmmgr: Some fixes - still incomplete Jason Andryuk
2021-05-04 12:48 ` [PATCH 1/9] docs: Warn about incomplete vtpmmgr TPM 2.0 support Jason Andryuk
2021-05-04 17:55   ` Andrew Cooper
2021-05-07 15:31   ` Daniel P. Smith
2021-05-04 12:48 ` [PATCH 2/9] vtpmmgr: Print error code to aid debugging Jason Andryuk
2021-05-04 13:03   ` Samuel Thibault
2021-05-07 15:33   ` Daniel P. Smith
2021-05-04 12:48 ` [PATCH 3/9] stubom: newlib: Enable C99 formats for %z Jason Andryuk
2021-05-04 13:08   ` Samuel Thibault
2021-05-07 15:37   ` Daniel P. Smith
2021-05-04 12:48 ` [PATCH 4/9] vtpmmgr: Allow specifying srk_handle for TPM2 Jason Andryuk
2021-05-04 13:13   ` Samuel Thibault
2021-05-04 17:04     ` Jason Andryuk
2021-05-04 17:07       ` Samuel Thibault
2021-05-04 17:27         ` Jason Andryuk
2021-05-04 17:48           ` Samuel Thibault
2021-05-04 12:48 ` [PATCH 5/9] vtpmmgr: Move vtpmmgr_shutdown Jason Andryuk
2021-05-04 13:14   ` Samuel Thibault
2021-05-04 12:48 ` [PATCH 6/9] vtpmmgr: Flush transient keys on shutdown Jason Andryuk
2021-05-04 13:15   ` Samuel Thibault
2021-05-04 12:48 ` [PATCH 7/9] vtpmmgr: Flush all transient keys Jason Andryuk
2021-05-04 13:16   ` Samuel Thibault
2021-05-04 17:05     ` Jason Andryuk
2021-05-04 17:07       ` Samuel Thibault
2021-05-04 12:48 ` [PATCH 8/9] vtpmmgr: Shutdown more gracefully Jason Andryuk
2021-05-04 13:18   ` Samuel Thibault [this message]
2021-05-04 12:48 ` [PATCH 9/9] vtpmmgr: Support GetRandom passthrough on TPM 2.0 Jason Andryuk
2021-05-04 13:33   ` Samuel Thibault
2021-05-04 17:23     ` Jason Andryuk
2021-05-04 17:47       ` Samuel Thibault

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