From: Paolo Bonzini <pbonzini@redhat.com>
To: kvm@vger.kernel.org
Cc: qemu-devel@nongnu.org
Subject: Re: [PATCH 3/3] megasas: LSI Megaraid SAS emulation
Date: Sun, 03 Jul 2011 16:36:22 +0200 [thread overview]
Message-ID: <4E107E66.3030001@redhat.com> (raw)
In-Reply-To: <4E0F2215.4040307@suse.de>
On 07/02/2011 03:50 PM, Hannes Reinecke wrote:
> (And no, I will not getting into another dog-fight with Paul B. here.
> Virtio can do without bounce buffers. AHCI can. So I fail to see why
> SCSI has to rely on bounce buffers.)
I agree, but I do see why a SCSI device might prefer to rely on bounce
buffers for non-I/O commands. This is why in my last RFC series for
vmw_pvscsi I let the device choose whether to force a bounce buffer or
get an external iovec from the HBA.
Paolo
WARNING: multiple messages have this Message-ID (diff)
From: Paolo Bonzini <pbonzini@redhat.com>
To: Hannes Reinecke <hare@suse.de>
Cc: kvm@vger.kernel.org, Alexander Graf <agraf@suse.de>,
Stefan Haynoczi <stefanha@linux.vnet.ibm.com>,
qemu-devel@nongnu.org
Subject: Re: [Qemu-devel] [PATCH 3/3] megasas: LSI Megaraid SAS emulation
Date: Sun, 03 Jul 2011 16:36:22 +0200 [thread overview]
Message-ID: <4E107E66.3030001@redhat.com> (raw)
In-Reply-To: <4E0F2215.4040307@suse.de>
On 07/02/2011 03:50 PM, Hannes Reinecke wrote:
> (And no, I will not getting into another dog-fight with Paul B. here.
> Virtio can do without bounce buffers. AHCI can. So I fail to see why
> SCSI has to rely on bounce buffers.)
I agree, but I do see why a SCSI device might prefer to rely on bounce
buffers for non-I/O commands. This is why in my last RFC series for
vmw_pvscsi I let the device choose whether to force a bounce buffer or
get an external iovec from the HBA.
Paolo
next prev parent reply other threads:[~2011-07-03 14:36 UTC|newest]
Thread overview: 39+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-07-01 15:35 [PATCH 0/3] [v5] Megasas HBA Emulation Hannes Reinecke
2011-07-01 15:35 ` [Qemu-devel] " Hannes Reinecke
2011-07-01 15:35 ` [PATCH 1/3] iov: Update parameter usage in iov_(to|from)_buf() Hannes Reinecke
2011-07-01 15:35 ` [Qemu-devel] " Hannes Reinecke
2011-07-01 15:35 ` [PATCH 2/3] scsi: Add 'hba_private' to SCSIRequest Hannes Reinecke
2011-07-01 15:35 ` [Qemu-devel] " Hannes Reinecke
2011-07-01 15:35 ` [PATCH 3/3] megasas: LSI Megaraid SAS emulation Hannes Reinecke
2011-07-01 15:35 ` [Qemu-devel] " Hannes Reinecke
2011-07-01 16:42 ` Alexander Graf
2011-07-01 16:42 ` [Qemu-devel] " Alexander Graf
2011-07-02 13:50 ` Hannes Reinecke
2011-07-02 13:50 ` [Qemu-devel] " Hannes Reinecke
2011-07-02 12:28 ` Alexander Graf
2011-07-02 12:28 ` [Qemu-devel] " Alexander Graf
2011-07-03 14:36 ` Paolo Bonzini [this message]
2011-07-03 14:36 ` Paolo Bonzini
2011-07-04 6:13 ` Hannes Reinecke
2011-07-04 6:13 ` [Qemu-devel] " Hannes Reinecke
2011-07-04 6:34 ` Paolo Bonzini
2011-07-04 6:34 ` [Qemu-devel] " Paolo Bonzini
2011-07-04 7:26 ` Hannes Reinecke
2011-07-04 7:26 ` [Qemu-devel] " Hannes Reinecke
2011-07-04 10:29 ` Paolo Bonzini
2011-07-04 10:29 ` [Qemu-devel] " Paolo Bonzini
2011-07-04 12:52 ` Hannes Reinecke
2011-07-04 12:52 ` [Qemu-devel] " Hannes Reinecke
2011-07-04 12:56 ` Paolo Bonzini
2011-07-04 12:56 ` [Qemu-devel] " Paolo Bonzini
2011-07-02 16:14 ` Stefan Hajnoczi
2011-07-02 16:14 ` Stefan Hajnoczi
2011-07-04 8:37 ` Hannes Reinecke
2011-07-04 8:37 ` Hannes Reinecke
2011-07-01 15:57 ` [PATCH 2/3] scsi: Add 'hba_private' to SCSIRequest Paolo Bonzini
2011-07-01 15:57 ` [Qemu-devel] " Paolo Bonzini
2011-07-01 16:19 ` [PATCH 1/3] iov: Update parameter usage in iov_(to|from)_buf() Alexander Graf
2011-07-01 16:19 ` [Qemu-devel] " Alexander Graf
-- strict thread matches above, loose matches on Subject: below --
2011-07-01 7:42 [PATCH 0/3] [v4] Megasas HBA emulation Hannes Reinecke
2011-07-01 7:42 ` [PATCH 1/3] iov: Add 'offset' parameter to iov_to_buf() Hannes Reinecke
2011-07-01 7:42 ` [PATCH 2/3] scsi: replace 'tag' with 'hba_private' pointer Hannes Reinecke
2011-07-01 7:42 ` [PATCH 3/3] megasas: LSI Megaraid SAS emulation Hannes Reinecke
2011-07-01 9:16 ` Alexander Graf
2011-07-03 8:09 ` Michael S. Tsirkin
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