From: "Michael S. Tsirkin" <mst@redhat.com>
To: Adrian Catangiu <acatan@amazon.com>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
qemu-devel@nongnu.org, kvm@vger.kernel.org,
linux-s390@vger.kernel.org, gregkh@linuxfoundation.org,
graf@amazon.com, rdunlap@infradead.org, arnd@arndb.de,
ebiederm@xmission.com, rppt@kernel.org, 0x7f454c46@gmail.com,
borntraeger@de.ibm.com, Jason@zx2c4.com, jannh@google.com,
w@1wt.eu, colmmacc@amazon.com, luto@kernel.org, tytso@mit.edu,
ebiggers@kernel.org, dwmw@amazon.co.uk, bonzini@gnu.org,
sblbir@amazon.com, raduweis@amazon.com, corbet@lwn.net,
mhocko@kernel.org, rafael@kernel.org, pavel@ucw.cz,
mpe@ellerman.id.au, areber@redhat.com, ovzxemul@gmail.com,
avagin@gmail.com, ptikhomirov@virtuozzo.com, gil@azul.com,
asmehra@redhat.com, dgunigun@redhat.com, vijaysun@ca.ibm.com,
oridgar@gmail.com, ghammer@redhat.com
Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver
Date: Tue, 9 Feb 2021 09:55:32 -0500 [thread overview]
Message-ID: <20210209095350-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <1612200294-17561-3-git-send-email-acatan@amazon.com>
> +The ``vmgenid`` driver uses ACPI events to be notified by hardware
> +changes to the 128-bit Vm Gen Id UUID.
That's ok, problem is ACPI event processing is asynchronous.
What we need is thus to flush out ACPI events whenever userspace
does a read, otherwise the value it gets will be stale.
--
MST
WARNING: multiple messages have this Message-ID (diff)
From: "Michael S. Tsirkin" <mst@redhat.com>
To: Adrian Catangiu <acatan@amazon.com>
Cc: Jason@zx2c4.com, areber@redhat.com, kvm@vger.kernel.org,
linux-doc@vger.kernel.org, ghammer@redhat.com,
vijaysun@ca.ibm.com, 0x7f454c46@gmail.com, qemu-devel@nongnu.org,
mhocko@kernel.org, dgunigun@redhat.com, avagin@gmail.com,
pavel@ucw.cz, ptikhomirov@virtuozzo.com,
linux-s390@vger.kernel.org, corbet@lwn.net, mpe@ellerman.id.au,
rafael@kernel.org, ebiggers@kernel.org, borntraeger@de.ibm.com,
sblbir@amazon.com, bonzini@gnu.org, arnd@arndb.de,
jannh@google.com, raduweis@amazon.com, asmehra@redhat.com,
graf@amazon.com, rppt@kernel.org, luto@kernel.org, gil@azul.com,
oridgar@gmail.com, colmmacc@amazon.com, tytso@mit.edu,
gregkh@linuxfoundation.org, rdunlap@infradead.org,
linux-kernel@vger.kernel.org, ebiederm@xmission.com,
ovzxemul@gmail.com, w@1wt.eu, dwmw@amazon.co.uk
Subject: Re: [PATCH v5 2/2] drivers/virt: vmgenid: add vm generation id driver
Date: Tue, 9 Feb 2021 09:55:32 -0500 [thread overview]
Message-ID: <20210209095350-mutt-send-email-mst@kernel.org> (raw)
In-Reply-To: <1612200294-17561-3-git-send-email-acatan@amazon.com>
> +The ``vmgenid`` driver uses ACPI events to be notified by hardware
> +changes to the 128-bit Vm Gen Id UUID.
That's ok, problem is ACPI event processing is asynchronous.
What we need is thus to flush out ACPI events whenever userspace
does a read, otherwise the value it gets will be stale.
--
MST
next prev parent reply other threads:[~2021-02-09 14:57 UTC|newest]
Thread overview: 24+ messages / expand[flat|nested] mbox.gz Atom feed top
2021-02-01 17:24 [PATCH v5 0/2] System Generation ID driver and VMGENID backend Adrian Catangiu
2021-02-01 17:24 ` acatan--- via
2021-02-01 17:24 ` Adrian Catangiu
2021-02-01 17:24 ` [PATCH v5 1/2] drivers/misc: sysgenid: add system generation id driver Adrian Catangiu
2021-02-01 17:24 ` acatan--- via
2021-02-01 17:24 ` Adrian Catangiu
2021-02-02 12:04 ` Greg KH
2021-02-02 12:04 ` Greg KH
2021-02-02 12:05 ` Greg KH
2021-02-02 12:05 ` Greg KH
2021-02-09 14:44 ` Catangiu, Adrian Costin
2021-02-02 12:08 ` Greg KH
2021-02-02 12:08 ` Greg KH
2021-02-09 14:46 ` Catangiu, Adrian Costin
2021-02-02 22:58 ` Randy Dunlap
2021-02-02 22:58 ` Randy Dunlap
2021-02-09 14:52 ` Michael S. Tsirkin
2021-02-09 14:52 ` Michael S. Tsirkin
2021-02-09 16:44 ` Catangiu, Adrian Costin
2021-02-01 17:24 ` [PATCH v5 2/2] drivers/virt: vmgenid: add vm " Adrian Catangiu
2021-02-01 17:24 ` acatan--- via
2021-02-01 17:24 ` Adrian Catangiu
2021-02-09 14:55 ` Michael S. Tsirkin [this message]
2021-02-09 14:55 ` Michael S. Tsirkin
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