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Re: [Qemu-devel] [PATCH 2/2] scsi-disk: scsi-block device for scsi pass-
From: |
Paolo Bonzini |
Subject: |
Re: [Qemu-devel] [PATCH 2/2] scsi-disk: scsi-block device for scsi pass-through should not be removable |
Date: |
Wed, 29 May 2013 14:56:50 +0200 |
User-agent: |
Mozilla/5.0 (X11; Linux x86_64; rv:17.0) Gecko/20130514 Thunderbird/17.0.6 |
Il 29/05/2013 14:33, Pavel Hrdina ha scritto:
> On 29.5.2013 14:24, Paolo Bonzini wrote:
>> Il 29/05/2013 14:12, Pavel Hrdina ha scritto:
>>> This patch adds a new SCSI_DISK_F_MONITOR_NOT_REMOVABLE feature. By this
>>> feature we can set that the scsi-block (scsi pass-through) device
>>> will still
>>> be removable from the guest side, but from monitor it cannot be removed.
>>>
>>> Signed-off-by: Pavel Hrdina <address@hidden>
>>> ---
>>> hw/scsi/scsi-disk.c | 10 +++++++---
>>> 1 file changed, 7 insertions(+), 3 deletions(-)
>>>
>>> diff --git a/hw/scsi/scsi-disk.c b/hw/scsi/scsi-disk.c
>>> index c8d2a99..190c3ad 100644
>>> --- a/hw/scsi/scsi-disk.c
>>> +++ b/hw/scsi/scsi-disk.c
>>> @@ -61,8 +61,9 @@ typedef struct SCSIDiskReq {
>>> BlockAcctCookie acct;
>>> } SCSIDiskReq;
>>>
>>> -#define SCSI_DISK_F_REMOVABLE 0
>>> -#define SCSI_DISK_F_DPOFUA 1
>>> +#define SCSI_DISK_F_REMOVABLE 0
>>> +#define SCSI_DISK_F_DPOFUA 1
>>> +#define SCSI_DISK_F_MONITOR_NOT_REMOVABLE 2
>>>
>>> struct SCSIDiskState
>>> {
>>> @@ -2107,7 +2108,8 @@ static int scsi_initfn(SCSIDevice *dev)
>>> return -1;
>>> }
>>>
>>> - if (s->features & (1 << SCSI_DISK_F_REMOVABLE)) {
>>> + if ((s->features & (1 << SCSI_DISK_F_REMOVABLE)) &&
>>> + !(s->features & (1 <<
>>> SCSI_DISK_F_MONITOR_NOT_REMOVABLE))) {
>>> bdrv_set_dev_ops(s->qdev.conf.bs,
>>> &scsi_disk_removable_block_ops, s);
>>> } else {
>>> bdrv_set_dev_ops(s->qdev.conf.bs, &scsi_disk_block_ops, s);
>>> @@ -2463,6 +2465,8 @@ static const TypeInfo scsi_cd_info = {
>>> static Property scsi_block_properties[] = {
>>> DEFINE_PROP_DRIVE("drive", SCSIDiskState, qdev.conf.bs),
>>> DEFINE_PROP_INT32("bootindex", SCSIDiskState,
>>> qdev.conf.bootindex, -1),
>>> + DEFINE_PROP_BIT("monitor_not_removable", SCSIDiskState, features,
>>> + SCSI_DISK_F_MONITOR_NOT_REMOVABLE, true),
>>> DEFINE_PROP_END_OF_LIST(),
>>> };
>>>
>>>
>>
>> I think the right fix is simply to remove
>>
>> if (buf[1] & 0x80) {
>> s->features |= 1 << SCSI_DISK_F_REMOVABLE;
>> }
>>
>> from get_device_type.
>>
>> Paolo
>>
>
> That was my first approach, but without this option it fails to start
> the guest if there was no media in the real CD-ROM.
>
> These are the errors:
> qemu-system-x86_64: -device
> scsi-block,drive=drive-cd-disk,bus=scsi0.0,id=scsi_cd: Device needs
> media, but drive is empty
> qemu-system-x86_64: -device
> scsi-block,drive=drive-cd-disk,bus=scsi0.0,id=scsi_cd: Device
> initialization failed.
> qemu-system-x86_64: -device
> scsi-block,drive=drive-cd-disk,bus=scsi0.0,id=scsi_cd: Device
> 'scsi-block' could not be initialized
Right. This test does not make sense for passthrough. So if we add
another feature bit (e.g. SCSI_DISK_F_PASSTHROUGH) we can simply skip it.
Alternatively, the optimal test in the SCSI_DISK_F_PASSTHROUGH case
would be something like:
bool bdrv_is_opened(BlockDriverState *bs)
{
return bs->drv != NULL;
}
Kevin, would you be okay with adding such a function?
Paolo