From: Oleksandr <olekstysh@gmail.com>
To: Julien Grall <julien@xen.org>
Cc: Jan Beulich <jbeulich@suse.com>,
xen-devel@lists.xenproject.org,
Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>,
Stefano Stabellini <sstabellini@kernel.org>,
Volodymyr Babchuk <Volodymyr_Babchuk@epam.com>,
Julien Grall <julien.grall@arm.com>
Subject: Re: [PATCH V1 09/16] arm/ioreq: Introduce arch specific bits for IOREQ/DM features
Date: Sat, 26 Sep 2020 16:18:05 +0300 [thread overview]
Message-ID: <3e29285b-bc8d-2152-918b-30c0d8d40a53@gmail.com> (raw)
In-Reply-To: <1575fbc3-5791-67f1-d1e1-823d5e0a8abc@xen.org>
On 26.09.20 16:12, Julien Grall wrote:
> Hi,
Hi Julien.
>
> On 24/09/2020 19:02, Oleksandr wrote:
>> On 24.09.20 19:02, Oleksandr wrote:
>>> On 24.09.20 14:08, Jan Beulich wrote:
>>>> On 23.09.2020 22:16, Oleksandr wrote:
>>>>> On 23.09.20 21:03, Julien Grall wrote:
>>>>>> On 10/09/2020 21:22, Oleksandr Tyshchenko wrote:
>>>>>>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>>>>>>> @@ -91,6 +108,28 @@ struct arch_domain
>>>>>>> #endif
>>>>>>> } __cacheline_aligned;
>>>>>>> +enum hvm_io_completion {
>>>>>>> + HVMIO_no_completion,
>>>>>>> + HVMIO_mmio_completion,
>>>>>>> + HVMIO_pio_completion
>>>>>>> +};
>>>>>>> +
>>>>>>> +struct hvm_vcpu_io {
>>>>>>> + /* I/O request in flight to device model. */
>>>>>>> + enum hvm_io_completion io_completion;
>>>>>>> + ioreq_t io_req;
>>>>>>> +
>>>>>>> + /*
>>>>>>> + * HVM emulation:
>>>>>>> + * Linear address @mmio_gla maps to MMIO physical frame
>>>>>>> @mmio_gpfn.
>>>>>>> + * The latter is known to be an MMIO frame (not RAM).
>>>>>>> + * This translation is only valid for accesses as per
>>>>>>> @mmio_access.
>>>>>>> + */
>>>>>>> + struct npfec mmio_access;
>>>>>>> + unsigned long mmio_gla;
>>>>>>> + unsigned long mmio_gpfn;
>>>>>>> +};
>>>>>>> +
>>>>>> Why do we need to re-define most of this? Can't this just be in
>>>>>> common
>>>>>> code?
>>>>> Jan asked almost the similar question in "[PATCH V1 02/16] xen/ioreq:
>>>>> Make x86's IOREQ feature common".
>>>>> Please see my answer there:
>>>>> https://patchwork.kernel.org/patch/11769105/#23637511
>>>>>
>>>>> Theoretically we could move this to the common code, but the
>>>>> question is
>>>>> how to be with other struct fields the x86's struct hvm_vcpu_io
>>>>> has/needs but
>>>>> Arm's seems not, would it be possible to logically split struct
>>>>> hvm_vcpu_io into common and arch parts?
>>>> Have struct vcpu_io and struct arch_vcpu_io as a sub-part of it?
>>> Although it is going to pull a lot of changes into x86/hvm/*, yes
>>> this way
>>> we indeed could logically split struct hvm_vcpu_io into common and
>>> arch parts in a clear way.
>>> If it is really worth it, I will start looking into it.
>> Julien, I noticed that three fields mmio* are not used within current
>> series on Arm. Do we expect them to be used later on?
>
> IIRC, I just copied them blindly when writing the PoC.
>
> The information can already be found using the HSR (syndrome
> register), so those fields would be redundant for us.
Got it.
>
>
>> Would be the following acceptable?
>> 1. Both fields "io_completion" and "io_req" (which seems to be the
>> only fields used in common/ioreq.c) are moved to common struct vcpu
>> as part of struct vcpu_io,
>> enum hvm_io_completion is also moved (and renamed).
>> 2. We remove everything related to hvm_vcpu* from the Arm header.
>> 3. x86's struct hvm_vcpu_io stays as it is (but without two fields
>> "io_completion" and "io_req").
>> I think, this way we separate a common part and reduce Xen
>> changes (which are getting bigger).
>
> The plan looks reasonable to me.
OK, will follow it. Thank you
--
Regards,
Oleksandr Tyshchenko
next prev parent reply other threads:[~2020-09-26 13:18 UTC|newest]
Thread overview: 111+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-09-10 20:21 [PATCH V1 00/16] IOREQ feature (+ virtio-mmio) on Arm Oleksandr Tyshchenko
2020-09-10 20:21 ` [PATCH V1 01/16] x86/ioreq: Prepare IOREQ feature for making it common Oleksandr Tyshchenko
2020-09-14 13:52 ` Jan Beulich
2020-09-21 12:22 ` Oleksandr
2020-09-21 12:31 ` Jan Beulich
2020-09-21 12:47 ` Oleksandr
2020-09-21 13:29 ` Jan Beulich
2020-09-21 14:43 ` Oleksandr
2020-09-21 15:28 ` Jan Beulich
2020-09-23 17:22 ` Julien Grall
2020-09-23 18:08 ` Oleksandr
2020-09-10 20:21 ` [PATCH V1 02/16] xen/ioreq: Make x86's IOREQ feature common Oleksandr Tyshchenko
2020-09-14 14:17 ` Jan Beulich
2020-09-21 19:02 ` Oleksandr
2020-09-22 6:33 ` Jan Beulich
2020-09-22 9:58 ` Oleksandr
2020-09-22 10:54 ` Jan Beulich
2020-09-22 15:05 ` Oleksandr
2020-09-22 15:52 ` Jan Beulich
2020-09-23 12:28 ` Oleksandr
2020-09-24 10:58 ` Jan Beulich
2020-09-24 15:38 ` Oleksandr
2020-09-24 15:51 ` Jan Beulich
2020-09-24 18:01 ` Julien Grall
2020-09-25 8:19 ` Paul Durrant
2020-09-30 13:39 ` Oleksandr
2020-09-30 17:47 ` Julien Grall
2020-10-01 6:59 ` Paul Durrant
2020-10-01 8:49 ` Jan Beulich
2020-10-01 8:50 ` Paul Durrant
2020-09-10 20:21 ` [PATCH V1 03/16] xen/ioreq: Make x86's hvm_ioreq_needs_completion() common Oleksandr Tyshchenko
2020-09-14 14:59 ` Jan Beulich
2020-09-22 16:16 ` Oleksandr
2020-09-23 17:27 ` Julien Grall
2020-09-10 20:21 ` [PATCH V1 04/16] xen/ioreq: Provide alias for the handle_mmio() Oleksandr Tyshchenko
2020-09-14 15:10 ` Jan Beulich
2020-09-22 16:20 ` Oleksandr
2020-09-23 17:28 ` Julien Grall
2020-09-23 18:17 ` Oleksandr
2020-09-10 20:21 ` [PATCH V1 05/16] xen/ioreq: Make x86's hvm_mmio_first(last)_byte() common Oleksandr Tyshchenko
2020-09-14 15:13 ` Jan Beulich
2020-09-22 16:24 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 06/16] xen/ioreq: Make x86's hvm_ioreq_(page/vcpu/server) structs common Oleksandr Tyshchenko
2020-09-14 15:16 ` Jan Beulich
2020-09-14 15:59 ` Julien Grall
2020-09-22 16:33 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 07/16] xen/dm: Make x86's DM feature common Oleksandr Tyshchenko
2020-09-14 15:56 ` Jan Beulich
2020-09-22 16:46 ` Oleksandr
2020-09-24 11:03 ` Jan Beulich
2020-09-24 12:47 ` Oleksandr
2020-09-23 17:35 ` Julien Grall
2020-09-23 18:28 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 08/16] xen/mm: Make x86's XENMEM_resource_ioreq_server handling common Oleksandr Tyshchenko
2020-09-10 20:22 ` [PATCH V1 09/16] arm/ioreq: Introduce arch specific bits for IOREQ/DM features Oleksandr Tyshchenko
2020-09-11 10:14 ` Oleksandr
2020-09-16 7:51 ` Jan Beulich
2020-09-22 17:12 ` Oleksandr
2020-09-23 18:03 ` Julien Grall
2020-09-23 20:16 ` Oleksandr
2020-09-24 11:08 ` Jan Beulich
2020-09-24 16:02 ` Oleksandr
2020-09-24 18:02 ` Oleksandr
2020-09-25 6:51 ` Jan Beulich
2020-09-25 9:47 ` Oleksandr
2020-09-26 13:12 ` Julien Grall
2020-09-26 13:18 ` Oleksandr [this message]
2020-09-24 16:51 ` Julien Grall
2020-09-24 17:25 ` Julien Grall
2020-09-24 18:22 ` Oleksandr
2020-09-26 13:21 ` Julien Grall
2020-09-26 14:57 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 10/16] xen/mm: Handle properly reference in set_foreign_p2m_entry() on Arm Oleksandr Tyshchenko
2020-09-16 7:17 ` Jan Beulich
2020-09-16 8:50 ` Julien Grall
2020-09-16 8:52 ` Jan Beulich
2020-09-16 8:55 ` Julien Grall
2020-09-22 17:30 ` Oleksandr
2020-09-16 8:08 ` Jan Beulich
2020-09-10 20:22 ` [PATCH V1 11/16] xen/ioreq: Introduce hvm_domain_has_ioreq_server() Oleksandr Tyshchenko
2020-09-16 8:04 ` Jan Beulich
2020-09-16 8:13 ` Paul Durrant
2020-09-16 8:39 ` Julien Grall
2020-09-16 8:43 ` Paul Durrant
2020-09-22 18:39 ` Oleksandr
2020-09-22 18:23 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 12/16] xen/dm: Introduce xendevicemodel_set_irq_level DM op Oleksandr Tyshchenko
2020-09-26 13:50 ` Julien Grall
2020-09-26 14:21 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 13/16] xen/ioreq: Make x86's invalidate qemu mapcache handling common Oleksandr Tyshchenko
2020-09-16 8:50 ` Jan Beulich
2020-09-22 19:32 ` Oleksandr
2020-09-24 11:16 ` Jan Beulich
2020-09-24 16:45 ` Oleksandr
2020-09-25 7:03 ` Jan Beulich
2020-09-25 13:05 ` Oleksandr
2020-10-02 9:55 ` Oleksandr
2020-10-07 10:38 ` Julien Grall
2020-10-07 12:01 ` Oleksandr
2020-09-10 20:22 ` [PATCH V1 14/16] xen/ioreq: Use guest_cmpxchg64() instead of cmpxchg() Oleksandr Tyshchenko
2020-09-16 9:04 ` Jan Beulich
2020-09-16 9:07 ` Julien Grall
2020-09-16 9:09 ` Paul Durrant
2020-09-16 9:12 ` Julien Grall
2020-09-22 20:05 ` Oleksandr
2020-09-23 18:12 ` Julien Grall
2020-09-23 20:29 ` Oleksandr
2020-09-16 9:07 ` Paul Durrant
2020-09-23 18:05 ` Julien Grall
2020-09-10 20:22 ` [PATCH V1 15/16] libxl: Introduce basic virtio-mmio support on Arm Oleksandr Tyshchenko
2020-09-10 20:22 ` [PATCH V1 16/16] [RFC] libxl: Add support for virtio-disk configuration Oleksandr Tyshchenko
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