linux-kernel - Re: [regression] significant delays when secureboot is enabled since 6.10

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Message-ID: <7e47f97aede88b87fbb9c9284db2005764bfbedd.camel@huaweicloud.com>
Date: Thu, 12 Sep 2024 10:13:55 +0200
From: Roberto Sassu <roberto.sassu@...weicloud.com>
To: Jarkko Sakkinen <jarkko@...nel.org>, James Bottomley
	 <James.Bottomley@...senPartnership.com>, Linux regressions mailing list
	 <regressions@...ts.linux.dev>
Cc: keyrings@...r.kernel.org, "linux-integrity@...r.kernel.org"
	 <linux-integrity@...r.kernel.org>, LKML <linux-kernel@...r.kernel.org>, 
	Pengyu Ma <mapengyu@...il.com>
Subject: Re: [regression] significant delays when secureboot is enabled
 since 6.10

On Wed, 2024-09-11 at 18:14 +0300, Jarkko Sakkinen wrote:
> On Wed Sep 11, 2024 at 11:53 AM EEST, Roberto Sassu wrote:
> > I made few measurements. I have a Fedora 38 VM with TPM passthrough.
> 
> I was thinking more like
> 
> sudo bpftrace -e 'k:tpm_transmit { @start[tid] = nsecs; } kr:tpm_transmit { @[kstack, ustack, comm] = sum(nsecs - @start[tid]); delete(@start[tid]); } END { clear(@start); }'
> 
> For example when running "tpm2_createprimary --hierarchy o -G rsa2048 -c owner.txt", I get:

Sure:

Without HMAC:

@[
    tpm_transmit_cmd+50
    tpm2_pcr_extend+295
    tpm_pcr_extend+221
    ima_add_template_entry+437
    ima_store_template+114
    ima_store_measurement+209
    process_measurement+2473
    ima_file_check+82
    security_file_post_open+92
    path_openat+550
    do_filp_open+171
    do_sys_openat2+186
    do_sys_open+76
    __x64_sys_openat+35
    x64_sys_call+9589
    do_syscall_64+96
    entry_SYSCALL_64_after_hwframe+118
, 
    0x7f338ee7be55
    0x55bf24459ac2
    0x7f338eda2b8a
    0x7f338eda2c4b
    0x55bf2445a9b5
, cat]: 5273648


With HMAC:

@[
    tpm_transmit_cmd+50
    tpm2_flush_context+95
    tpm2_start_auth_session+676
    tpm2_pcr_extend+39
    tpm_pcr_extend+221
    ima_add_template_entry+437
    ima_store_template+114
    ima_store_measurement+209
    process_measurement+2473
    ima_file_check+82
    security_file_post_open+92
    path_openat+550
    do_filp_open+171
    do_sys_openat2+186
    do_sys_open+76
    __x64_sys_openat+35
    x64_sys_call+9589
    do_syscall_64+96
    entry_SYSCALL_64_after_hwframe+118
, 
    0x7f03ea0ade55
    0x55f929b7dac2
    0x7f03e9fd4b8a
    0x7f03e9fd4c4b
    0x55f929b7e9b5
, cat]: 3128177
@[
    tpm_transmit_cmd+50
    tpm2_pcr_extend+338
    tpm_pcr_extend+221
    ima_add_template_entry+437
    ima_store_template+114
    ima_store_measurement+209
    process_measurement+2473
    ima_file_check+82
    security_file_post_open+92
    path_openat+550
    do_filp_open+171
    do_sys_openat2+186
    do_sys_open+76
    __x64_sys_openat+35
    x64_sys_call+9589
    do_syscall_64+96
    entry_SYSCALL_64_after_hwframe+118
, 
    0x7f03ea0ade55
    0x55f929b7dac2
    0x7f03e9fd4b8a
    0x7f03e9fd4c4b
    0x55f929b7e9b5
, cat]: 25851638
@[
    tpm_transmit_cmd+50
    tpm2_load_context+161
    tpm2_start_auth_session+98
    tpm2_pcr_extend+39
    tpm_pcr_extend+221
    ima_add_template_entry+437
    ima_store_template+114
    ima_store_measurement+209
    process_measurement+2473
    ima_file_check+82
    security_file_post_open+92
    path_openat+550
    do_filp_open+171
    do_sys_openat2+186
    do_sys_open+76
    __x64_sys_openat+35
    x64_sys_call+9589
    do_syscall_64+96
    entry_SYSCALL_64_after_hwframe+118
, 
    0x7f03ea0ade55
    0x55f929b7dac2
    0x7f03e9fd4b8a
    0x7f03e9fd4c4b
    0x55f929b7e9b5
, cat]: 35928108
@[
    tpm_transmit_cmd+50
    tpm2_start_auth_session+650
    tpm2_pcr_extend+39
    tpm_pcr_extend+221
    ima_add_template_entry+437
    ima_store_template+114
    ima_store_measurement+209
    process_measurement+2473
    ima_file_check+82
    security_file_post_open+92
    path_openat+550
    do_filp_open+171
    do_sys_openat2+186
    do_sys_open+76
    __x64_sys_openat+35
    x64_sys_call+9589
    do_syscall_64+96
    entry_SYSCALL_64_after_hwframe+118
, 
    0x7f03ea0ade55
    0x55f929b7dac2
    0x7f03e9fd4b8a
    0x7f03e9fd4c4b
    0x55f929b7e9b5
, cat]: 84616611

Roberto