From: Oleksandr <olekstysh@gmail.com>
To: Jan Beulich <jbeulich@suse.com>
Cc: "Oleksandr Tyshchenko" <oleksandr_tyshchenko@epam.com>,
"Paul Durrant" <paul@xen.org>,
"Andrew Cooper" <andrew.cooper3@citrix.com>,
"Roger Pau Monné" <roger.pau@citrix.com>,
"Julien Grall" <julien@xen.org>,
"Stefano Stabellini" <sstabellini@kernel.org>,
"Wei Liu" <wl@xen.org>, "Julien Grall" <julien.grall@arm.com>,
xen-devel@lists.xenproject.org
Subject: Re: [PATCH V2 01/23] x86/ioreq: Prepare IOREQ feature for making it common
Date: Fri, 13 Nov 2020 13:09:37 +0200 [thread overview]
Message-ID: <cd16e1f2-849d-ec12-3325-382b8f6689ff@gmail.com> (raw)
In-Reply-To: <61ea02e0-bdd4-5a0a-dd6f-b22e806e6d1e@suse.com>
On 12.11.20 12:58, Jan Beulich wrote:
Hi Jan.
> On 15.10.2020 18:44, Oleksandr Tyshchenko wrote:
>> From: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
>>
>> As a lot of x86 code can be re-used on Arm later on, this
>> patch makes some preparation to x86/hvm/ioreq.c before moving
>> to the common code. This way we will get a verbatim copy for
>> a code movement in subsequent patch (arch/x86/hvm/ioreq.c
>> will be *just* renamed to common/ioreq).
>>
>> This patch does the following:
>> 1. Introduce *inline* arch_hvm_ioreq_init(), arch_hvm_ioreq_destroy(),
>> arch_hvm_io_completion(), arch_hvm_destroy_ioreq_server() and
>> hvm_ioreq_server_get_type_addr() to abstract arch specific materials.
>> 2 Make hvm_map_mem_type_to_ioreq_server() *inline*. It is not going
>> to be called from the common code.
> As already indicated on another sub-thread, I think some of these
> are too large to be inline functions. Additionally, considering
> their single-use purpose, I don't think they should be placed in
> a header consumed by more than the producer and the sole consumer.
ok, the only reason I made these inline was to achieve a moving of the
whole x86/hvm/ioreq.c to the common code.
I will move some of them back to ioreq.c.
>
>> 3. Make get_ioreq_server() global. It is going to be called from
>> a few places.
> And with this its name ought to change, to fit the general naming
> model of global functions of this subsystem.
I think, with new requirements (making
hvm_map_mem_type_to_ioreq_server() common) this helper
doesn't need to be global. I will make it static again.
>
>> 4. Add IOREQ_STATUS_* #define-s and update candidates for moving.
> This, it seems to me, could be a separate patch.
Well, will do.
>
>> @@ -855,7 +841,7 @@ int hvm_destroy_ioreq_server(struct domain *d, ioservid_t id)
>>
>> domain_pause(d);
>>
>> - p2m_set_ioreq_server(d, 0, s);
>> + arch_hvm_destroy_ioreq_server(s);
> Iirc there are plans to rename hvm_destroy_ioreq_server() in the
> course of the generalization. If so, this arch hook would imo
> better be named following the new scheme right away.
Could you please clarify, are you speaking about the plans discussed there
"[PATCH V2 12/23] xen/ioreq: Remove "hvm" prefixes from involved
function names"?
Copy text for the convenience:
AT least some of the functions touched here would be nice to be
moved to a more consistent new naming scheme right away, to
avoid having to touch all the same places again. I guess ioreq
server functions would be nice to all start with ioreq_server_
and ioreq functions to all start with ioreq_. E.g. ioreq_send()
and ioreq_server_select().
or some other plans I am not aware of?
What I really want to avoid with IOREQ enabling work is the round-trips
related to naming things, this patch series
became quite big (and consumes som time to rebase and test it) and I
expect it to become bigger.
So the arch_hvm_destroy_ioreq_server() should be
arch_ioreq_server_destroy()?
>
>> @@ -1215,7 +1153,7 @@ void hvm_destroy_all_ioreq_servers(struct domain *d)
>> struct hvm_ioreq_server *s;
>> unsigned int id;
>>
>> - if ( !relocate_portio_handler(d, 0xcf8, 0xcf8, 4) )
>> + if ( !arch_hvm_ioreq_destroy(d) )
> There's no ioreq being destroyed here, so I think this wants
> renaming (and again ideally right away following the planned
> new scheme).
Agree that no ioreq being destroyed here. Probably
ioreq_server_check_for_destroy()?
I couldn't think of a better name.
>
>> +static inline int hvm_map_mem_type_to_ioreq_server(struct domain *d,
>> + ioservid_t id,
>> + uint32_t type,
>> + uint32_t flags)
>> +{
>> + struct hvm_ioreq_server *s;
>> + int rc;
>> +
>> + if ( type != HVMMEM_ioreq_server )
>> + return -EINVAL;
>> +
>> + if ( flags & ~XEN_DMOP_IOREQ_MEM_ACCESS_WRITE )
>> + return -EINVAL;
>> +
>> + spin_lock_recursive(&d->arch.hvm.ioreq_server.lock);
>> +
>> + s = get_ioreq_server(d, id);
>> +
>> + rc = -ENOENT;
>> + if ( !s )
>> + goto out;
>> +
>> + rc = -EPERM;
>> + if ( s->emulator != current->domain )
>> + goto out;
>> +
>> + rc = p2m_set_ioreq_server(d, flags, s);
>> +
>> + out:
>> + spin_unlock_recursive(&d->arch.hvm.ioreq_server.lock);
>> +
>> + if ( rc == 0 && flags == 0 )
>> + {
>> + struct p2m_domain *p2m = p2m_get_hostp2m(d);
> I realize I may be asking too much, but would it be possible if,
> while moving code, you made simple and likely uncontroversial
> adjustments like adding const here? (Such adjustments would be
> less desirable to make if they increased the size of the patch,
> e.g. if you were touching only nearby code.)
This function as well as one located below won't be moved to this header
for the next version of patch.
ok, will add const.
>
>> + if ( read_atomic(&p2m->ioreq.entry_count) )
>> + p2m_change_entry_type_global(d, p2m_ioreq_server, p2m_ram_rw);
>> + }
>> +
>> + return rc;
>> +}
>> +
>> +static inline int hvm_ioreq_server_get_type_addr(const struct domain *d,
>> + const ioreq_t *p,
>> + uint8_t *type,
>> + uint64_t *addr)
>> +{
>> + uint32_t cf8 = d->arch.hvm.pci_cf8;
> Similarly, for example, neither this nor ...
>
>> + if ( p->type != IOREQ_TYPE_COPY && p->type != IOREQ_TYPE_PIO )
>> + return -EINVAL;
>> +
>> + if ( p->type == IOREQ_TYPE_PIO &&
>> + (p->addr & ~3) == 0xcfc &&
>> + CF8_ENABLED(cf8) )
>> + {
>> + uint32_t x86_fam;
> ... this really need to use a fixed width type - unsigned int is
> going to be quite fine. But since you're only moving this code,
> I guess I'm not going to insist.
Will use unsigned int.
>
>> +static inline bool arch_hvm_ioreq_destroy(struct domain *d)
>> +{
>> + if ( !relocate_portio_handler(d, 0xcf8, 0xcf8, 4) )
>> + return false;
>> +
>> + return true;
> Any reason this cannot simply be
>
> return relocate_portio_handler(d, 0xcf8, 0xcf8, 4);
Yes, good point.
--
Regards,
Oleksandr Tyshchenko
next prev parent reply other threads:[~2020-11-13 11:10 UTC|newest]
Thread overview: 109+ messages / expand[flat|nested] mbox.gz Atom feed top
2020-10-15 16:44 [PATCH V2 00/23] IOREQ feature (+ virtio-mmio) on Arm Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 01/23] x86/ioreq: Prepare IOREQ feature for making it common Oleksandr Tyshchenko
2020-10-20 7:13 ` Paul Durrant
2020-11-04 9:06 ` Oleksandr
2020-11-04 9:59 ` Paul Durrant
2020-11-12 10:58 ` Jan Beulich
2020-11-13 11:09 ` Oleksandr [this message]
2020-11-13 11:20 ` Jan Beulich
2020-11-13 12:45 ` Oleksandr
2020-11-13 14:31 ` Jan Beulich
2020-10-15 16:44 ` [PATCH V2 02/23] xen/ioreq: Make x86's IOREQ feature common Oleksandr Tyshchenko
2020-10-20 7:57 ` Paul Durrant
2020-11-10 16:45 ` Oleksandr
2020-11-17 14:47 ` Oleksandr
2020-11-17 15:29 ` Paul Durrant
2020-11-17 16:29 ` Oleksandr
2020-11-17 19:43 ` Paul Durrant
2020-11-12 11:11 ` Jan Beulich
2020-11-13 13:11 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 03/23] xen/ioreq: Make x86's hvm_ioreq_needs_completion() common Oleksandr Tyshchenko
2020-10-20 7:59 ` Paul Durrant
2020-10-15 16:44 ` [PATCH V2 04/23] xen/ioreq: Provide alias for the handle_mmio() Oleksandr Tyshchenko
2020-10-20 9:14 ` Paul Durrant
2020-10-20 10:05 ` Jan Beulich
2020-10-20 10:38 ` Paul Durrant
2020-11-10 19:44 ` Oleksandr
2020-11-11 7:27 ` Jan Beulich
2020-11-11 8:09 ` Oleksandr
2020-11-11 8:16 ` Jan Beulich
2020-10-15 16:44 ` [PATCH V2 05/23] xen/ioreq: Make x86's hvm_mmio_first(last)_byte() common Oleksandr Tyshchenko
2020-10-20 9:15 ` Paul Durrant
2020-10-15 16:44 ` [PATCH V2 06/23] xen/ioreq: Make x86's hvm_ioreq_(page/vcpu/server) structs common Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 07/23] xen/ioreq: Move x86's ioreq_gfn(server) to struct domain Oleksandr Tyshchenko
2020-11-12 11:21 ` Jan Beulich
2020-11-13 14:05 ` Oleksandr
2020-11-18 12:09 ` Oleksandr
2020-11-18 12:29 ` Paul Durrant
2020-10-15 16:44 ` [PATCH V2 08/23] xen/ioreq: Introduce ioreq_params to abstract accesses to arch.hvm.params Oleksandr Tyshchenko
2020-10-20 10:41 ` Paul Durrant
2020-11-10 20:00 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 09/23] xen/dm: Make x86's DM feature common Oleksandr Tyshchenko
2020-11-12 11:32 ` Jan Beulich
2020-11-13 14:28 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 10/23] xen/mm: Make x86's XENMEM_resource_ioreq_server handling common Oleksandr Tyshchenko
2020-11-12 11:40 ` Jan Beulich
2020-11-13 15:00 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 11/23] xen/ioreq: Move x86's io_completion/io_req fields to struct vcpu Oleksandr Tyshchenko
2020-10-20 10:55 ` Paul Durrant
2020-11-10 20:59 ` Oleksandr
2020-11-11 8:04 ` Jan Beulich
2020-11-11 8:14 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 12/23] xen/ioreq: Remove "hvm" prefixes from involved function names Oleksandr Tyshchenko
2020-11-12 11:45 ` Jan Beulich
2020-11-12 12:14 ` Paul Durrant
2020-11-13 15:53 ` Oleksandr
2020-11-23 14:39 ` Oleksandr
2020-11-23 14:56 ` Jan Beulich
2020-11-23 15:47 ` Oleksandr
2020-11-23 15:54 ` Paul Durrant
2020-11-23 16:36 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 13/23] xen/ioreq: Use guest_cmpxchg64() instead of cmpxchg() Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 14/23] arm/ioreq: Introduce arch specific bits for IOREQ/DM features Oleksandr Tyshchenko
2020-11-12 11:48 ` Jan Beulich
2020-11-13 15:48 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 15/23] xen/arm: Stick around in leave_hypervisor_to_guest until I/O has completed Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 16/23] xen/mm: Handle properly reference in set_foreign_p2m_entry() on Arm Oleksandr Tyshchenko
2020-11-12 12:18 ` Jan Beulich
2020-11-13 17:00 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 17/23] xen/ioreq: Introduce domain_has_ioreq_server() Oleksandr Tyshchenko
2020-10-20 10:51 ` Paul Durrant
2020-11-10 20:53 ` Oleksandr
2020-11-11 8:08 ` Jan Beulich
2020-11-11 8:41 ` Oleksandr
2020-11-11 13:27 ` Jan Beulich
2020-11-11 16:28 ` Paul Durrant
2020-11-11 17:33 ` Oleksandr
2020-11-11 17:31 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 18/23] xen/dm: Introduce xendevicemodel_set_irq_level DM op Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 19/23] xen/arm: io: Abstract sign-extension Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 20/23] xen/ioreq: Make x86's send_invalidate_req() common Oleksandr Tyshchenko
2020-11-12 11:55 ` Jan Beulich
2020-11-13 16:03 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 21/23] xen/arm: Add mapcache invalidation handling Oleksandr Tyshchenko
2020-10-16 6:29 ` Jan Beulich
2020-10-16 8:41 ` Julien Grall
2020-10-16 8:56 ` Jan Beulich
2020-11-11 0:03 ` Oleksandr
2020-11-11 19:27 ` Julien Grall
2020-11-11 19:42 ` Oleksandr
2020-10-15 16:44 ` [PATCH V2 22/23] libxl: Introduce basic virtio-mmio support on Arm Oleksandr Tyshchenko
2020-10-15 16:44 ` [PATCH V2 23/23] [RFC] libxl: Add support for virtio-disk configuration Oleksandr Tyshchenko
2020-11-09 6:45 ` Wei Chen
2020-11-11 0:53 ` Oleksandr
2020-11-11 4:28 ` Wei Chen
2020-11-13 17:38 ` Oleksandr
2020-10-29 7:41 ` [PATCH V2 00/23] IOREQ feature (+ virtio-mmio) on Arm Masami Hiramatsu
2020-10-29 18:48 ` Oleksandr Tyshchenko
2020-10-29 19:53 ` Stefano Stabellini
2020-10-29 21:13 ` Oleksandr Tyshchenko
2020-10-29 21:34 ` Stefano Stabellini
2020-10-30 11:34 ` Masami Hiramatsu
2020-10-31 21:10 ` Oleksandr Tyshchenko
2020-11-02 7:23 ` Wei Chen
2020-11-02 18:05 ` Oleksandr
2020-11-03 14:30 ` Masami Hiramatsu
2020-11-03 21:09 ` Oleksandr
2020-10-29 20:03 ` Alex Bennée
2020-10-29 20:10 ` Stefano Stabellini
2020-10-29 22:06 ` Oleksandr Tyshchenko
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