kvm.vger.kernel.org archive mirror
 help / color / mirror / Atom feed
From: "Nikunj A. Dadhania" <nikunj@amd.com>
To: Tom Lendacky <thomas.lendacky@amd.com>,
	linux-kernel@vger.kernel.org, x86@kernel.org,
	kvm@vger.kernel.org
Cc: bp@alien8.de, mingo@redhat.com, tglx@linutronix.de,
	dave.hansen@linux.intel.com, dionnaglaze@google.com,
	pgonda@google.com, seanjc@google.com, pbonzini@redhat.com
Subject: Re: [PATCH v7 06/16] virt: sev-guest: Move SNP Guest command mutex
Date: Sat, 27 Jan 2024 09:36:14 +0530	[thread overview]
Message-ID: <709a64c2-a58a-4d74-bb63-2e1193c2f83b@amd.com> (raw)
In-Reply-To: <47bbe1e6-e9c6-cff8-987e-e244581f689b@amd.com>

On 1/27/2024 3:41 AM, Tom Lendacky wrote:
> On 12/20/23 09:13, Nikunj A Dadhania wrote:
>> SNP command mutex is used to serialize the shared buffer access, command
>> handling and message sequence number races. Move the SNP guest command
>> mutex out of the sev guest driver and provide accessors to sev-guest
>> driver. Remove multiple lockdep check in sev-guest driver, next patch adds
>> a single lockdep check in snp_send_guest_request().
>>
>> Signed-off-by: Nikunj A Dadhania <nikunj@amd.com>
>> ---
>>   arch/x86/include/asm/sev-guest.h        |  3 +++
>>   arch/x86/kernel/sev.c                   | 21 +++++++++++++++++++++
>>   drivers/virt/coco/sev-guest/sev-guest.c | 23 +++++++----------------
>>   3 files changed, 31 insertions(+), 16 deletions(-)
>>
>> diff --git a/arch/x86/include/asm/sev-guest.h b/arch/x86/include/asm/sev-guest.h
>> index 27cc15ad6131..2f3cceb88396 100644
>> --- a/arch/x86/include/asm/sev-guest.h
>> +++ b/arch/x86/include/asm/sev-guest.h
>> @@ -81,4 +81,7 @@ struct snp_guest_req {
>>     int snp_issue_guest_request(struct snp_guest_req *req, struct snp_req_data *input,
>>                   struct snp_guest_request_ioctl *rio);
>> +void snp_guest_cmd_lock(void);
>> +void snp_guest_cmd_unlock(void);
>> +
>>   #endif /* __VIRT_SEVGUEST_H__ */
>> diff --git a/arch/x86/kernel/sev.c b/arch/x86/kernel/sev.c
>> index 6aa0bdf8a7a0..191193924b22 100644
>> --- a/arch/x86/kernel/sev.c
>> +++ b/arch/x86/kernel/sev.c
>> @@ -941,6 +941,21 @@ static void snp_cleanup_vmsa(struct sev_es_save_area *vmsa)
>>           free_page((unsigned long)vmsa);
>>   }
>>   +/*  SNP Guest command mutex to serialize the shared buffer access and command handling. */
>> +static struct mutex snp_guest_cmd_mutex;
> 
> You should probably use:
> 
> static DEFINE_MUTEX(snp_guest_cmd_mutex);
> 
> That way you can avoid the initialization in snp_init_platform_device().
> 
> With that:
> 
> Reviewed-by: Tom Lendacky <thomas.lendacky@amd.com>

Sure, will change.

Regards
Nikunj


  reply	other threads:[~2024-01-27  4:06 UTC|newest]

Thread overview: 38+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2023-12-20 15:13 [PATCH v7 00/16] Add Secure TSC support for SNP guests Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 01/16] virt: sev-guest: Use AES GCM crypto library Nikunj A Dadhania
2024-01-25 10:36   ` Borislav Petkov
2024-01-27  3:54     ` Nikunj A. Dadhania
2023-12-20 15:13 ` [PATCH v7 02/16] virt: sev-guest: Replace dev_dbg with pr_debug Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 03/16] virt: sev-guest: Add SNP guest request structure Nikunj A Dadhania
2024-01-25 11:59   ` Borislav Petkov
2024-01-27  4:01     ` Nikunj A. Dadhania
2024-01-31 13:58     ` Nikunj A. Dadhania
2024-02-01 10:29       ` Borislav Petkov
2024-02-01 11:10         ` Nikunj A. Dadhania
2024-02-01 14:07           ` Borislav Petkov
2024-02-02  3:50             ` Nikunj A. Dadhania
2024-02-02 16:14               ` Borislav Petkov
2024-02-05  9:23                 ` Nikunj A. Dadhania
2024-02-06 10:04                   ` Borislav Petkov
2024-01-26 21:16   ` Tom Lendacky
2024-01-27  4:05     ` Nikunj A. Dadhania
2023-12-20 15:13 ` [PATCH v7 04/16] virt: sev-guest: Add vmpck_id to snp_guest_dev struct Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 05/16] x86/sev: Cache the secrets page address Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 06/16] virt: sev-guest: Move SNP Guest command mutex Nikunj A Dadhania
2024-01-26 22:11   ` Tom Lendacky
2024-01-27  4:06     ` Nikunj A. Dadhania [this message]
2023-12-20 15:13 ` [PATCH v7 07/16] x86/sev: Move and reorganize sev guest request api Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 08/16] x86/mm: Add generic guest initialization hook Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 09/16] x86/cpufeatures: Add synthetic Secure TSC bit Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 10/16] x86/sev: Add Secure TSC support for SNP guests Nikunj A Dadhania
2024-02-01 15:46   ` Paolo Bonzini
2024-02-01 15:48     ` Paolo Bonzini
2023-12-20 15:13 ` [PATCH v7 11/16] x86/sev: Change TSC MSR behavior for Secure TSC enabled guests Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 12/16] x86/sev: Prevent RDTSC/RDTSCP interception " Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 13/16] x86/kvmclock: Skip kvmclock when Secure TSC is available Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 14/16] x86/sev: Mark Secure TSC as reliable Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 15/16] x86/cpu/amd: Do not print FW_BUG for Secure TSC Nikunj A Dadhania
2023-12-20 15:13 ` [PATCH v7 16/16] x86/sev: Enable Secure TSC for SNP guests Nikunj A Dadhania
2024-01-25  6:08 ` [PATCH v7 00/16] Add Secure TSC support " Nikunj A. Dadhania
2024-01-26  1:00   ` Dionna Amalie Glaze
2024-01-27  4:10     ` Nikunj A. Dadhania

Reply instructions:

You may reply publicly to this message via plain-text email
using any one of the following methods:

* Save the following mbox file, import it into your mail client,
  and reply-to-all from there: mbox

  Avoid top-posting and favor interleaved quoting:
  https://en.wikipedia.org/wiki/Posting_style#Interleaved_style

* Reply using the --to, --cc, and --in-reply-to
  switches of git-send-email(1):

  git send-email \
    --in-reply-to=709a64c2-a58a-4d74-bb63-2e1193c2f83b@amd.com \
    --to=nikunj@amd.com \
    --cc=bp@alien8.de \
    --cc=dave.hansen@linux.intel.com \
    --cc=dionnaglaze@google.com \
    --cc=kvm@vger.kernel.org \
    --cc=linux-kernel@vger.kernel.org \
    --cc=mingo@redhat.com \
    --cc=pbonzini@redhat.com \
    --cc=pgonda@google.com \
    --cc=seanjc@google.com \
    --cc=tglx@linutronix.de \
    --cc=thomas.lendacky@amd.com \
    --cc=x86@kernel.org \
    /path/to/YOUR_REPLY

  https://kernel.org/pub/software/scm/git/docs/git-send-email.html

* If your mail client supports setting the In-Reply-To header
  via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).