From: "Roger Pau Monné" <roger.pau@citrix.com>
To: Alexey G <x1917x@gmail.com>
Cc: xen-devel@lists.xenproject.org,
Ian Jackson <ian.jackson@eu.citrix.com>,
Wei Liu <wei.liu2@citrix.com>, Jan Beulich <jbeulich@suse.com>,
Andrew Cooper <andrew.cooper3@citrix.com>
Subject: Re: [RFC PATCH 11/12] hvmloader: use libacpi to build MCFG table
Date: Tue, 20 Mar 2018 08:58:09 +0000 [thread overview]
Message-ID: <20180320085809.aw3oxhajmxyo3e4i@MacBook-Pro-de-Roger.local> (raw)
In-Reply-To: <20180320072053.0000138d@gmail.com>
On Tue, Mar 20, 2018 at 07:20:53AM +1000, Alexey G wrote:
> On Mon, 19 Mar 2018 17:49:09 +0000
> Roger Pau Monné <roger.pau@citrix.com> wrote:
>
> >On Tue, Mar 13, 2018 at 04:33:56AM +1000, Alexey Gerasimenko wrote:
> >> This patch extends hvmloader_acpi_build_tables() with code which
> >> detects if MMCONFIG is available -- i.e. initialized and enabled
> >> (+we're running on Q35), obtains its base address and size and asks
> >> libacpi to build MCFG table for it via setting the flag
> >> ACPI_HAS_MCFG in a manner similar to other optional ACPI tables
> >> building.
> >>
> >> Signed-off-by: Alexey Gerasimenko <x1917x@gmail.com>
> >> ---
> >> tools/firmware/hvmloader/util.c | 70
> >> +++++++++++++++++++++++++++++++++++++++++ 1 file changed, 70
> >> insertions(+)
> >>
> >> diff --git a/tools/firmware/hvmloader/util.c
> >> b/tools/firmware/hvmloader/util.c index d8db9e3c8e..c6fc81d52a 100644
> >> --- a/tools/firmware/hvmloader/util.c
> >> +++ b/tools/firmware/hvmloader/util.c
> >> @@ -782,6 +782,69 @@ int get_pc_machine_type(void)
> >> return machine_type;
> >> }
> >>
> >> +#define PCIEXBAR_ADDR_MASK_64MB (~((1ULL << 26) - 1))
> >> +#define PCIEXBAR_ADDR_MASK_128MB (~((1ULL << 27) - 1))
> >> +#define PCIEXBAR_ADDR_MASK_256MB (~((1ULL << 28) - 1))
> >> +#define PCIEXBAR_LENGTH_BITS(reg) (((reg) >> 1) & 3)
> >> +#define PCIEXBAREN 1
> >
> >PCIEXBAR_ENABLE maybe?
>
> PCIEXBAREN is just an official name of this bit from the
> Intel datasheet. :) OK, will rename it to PCIEXBAR_ENABLE.
Oh, if that's the name on the spec then leave it as-is. It's always
best to be able to search directly on the spec.
> >> +
> >> +static uint64_t mmconfig_get_base(void)
> >> +{
> >> + uint64_t base;
> >> + uint32_t reg = pci_readl(PCI_MCH_DEVFN, PCI_MCH_PCIEXBAR);
> >> +
> >> + base = reg | (uint64_t) pci_readl(PCI_MCH_DEVFN,
> >> PCI_MCH_PCIEXBAR+4) << 32;
> >
> >Please add parentheses in the above expression.
>
> Agree, parentheses will make the op priority clearer.
>
> >> +
> >> + switch (PCIEXBAR_LENGTH_BITS(reg))
> >> + {
> >> + case 0:
> >> + base &= PCIEXBAR_ADDR_MASK_256MB;
> >> + break;
> >> + case 1:
> >> + base &= PCIEXBAR_ADDR_MASK_128MB;
> >> + break;
> >> + case 2:
> >> + base &= PCIEXBAR_ADDR_MASK_64MB;
> >> + break;
> >
> >Missing newlines, plus this looks like it wants to use the defines
> >introduced in patch 7 (PCIEXBAR_{64,128,256}_BUSES). Also any reason
> >this patch and patch 7 cannot be put sequentially?
>
> I think all these #defines should find a way to pci_regs.h, it seems
> like an appropriate place for them.
Hm, pci_regs.h seems to contain the generic PCI registers. Those
should maybe live in a q35.h header, since it's very device specific
AFAICT.
> Regarding the order of hvmloader patches -- will verify this for
> the next version.
>
> >They are very related, and in fact I'm not sure why we need to write
> >this info to the device in patch 7 and then fetch it from the device
> >here. Isn't there an easier way to pass this information? At the end
> >this is all in hvmloader.
>
> Well, the hvmloader_acpi_build_tables() function mostly does device
> probing (using I/O instruction) and xenstore reads to collect system
> information in order to discover which ACPI_HAS_* flags it should pass
> to acpi_build_tables(), but using global variables to pass this kind of
> information for MMCONFIG will be OK too I think.
It was just a suggestion, it seems kind of cumbersome to write
something to a register and then fetch it afterwards, when it's all
done in the same binary.
> >> + case 3:
> >
> >default:
>
> There is '& 3' for the switch argument, but ok I guess, it's clearer
> with 'default'.
>
> >> + BUG(); /* a reserved value encountered */
> >> + }
> >> +
> >> + return base;
> >> +}
> >> +
> >> +static uint32_t mmconfig_get_size(void)
> >
> >unsigned int or size_t?
>
> Using types which are common to the existing code.
>
> size_t have almost zero use in hvmloader.
If it's available I would rather use it.
> >> +{
> >> + if (get_pc_machine_type() == MACHINE_TYPE_Q35)
> >> + {
> >> + if (mmconfig_is_enabled() && mmconfig_get_base())
> >
> >Coding style.
> >
> >Also you can join the conditions:
> >
> >if ( get_pc_machine_type() == MACHINE_TYPE_Q35 &&
> >mmconfig_is_enabled() &&
> > mmconfig_get_base() )
> > return true;
> >
> >Looking at this, is it actually a valid state to have
> >mmconfig_is_enabled() == true and mmconfig_get_base() == 0?
>
> Yes, in theory we can have either PCIEXBAREN=0 and a valid PCIEXBAR
> base, or vice versa.
> Of course normally we should not encounter a situation where base=0 and
> PCIEXBAREN=1, just covering here possible cases which the register
> format allows.
But those registers are set by hvmloader, and I don't think hvmloader
will ever set PCIEXBAREN == 1 and PCIEXBAR base == 0?
> Regarding check merging -- ok, sure. Short-circuit evaluation should
> guaranty that these registers are not touched on a different
> machine.
Yes, if you first check for the chipset type.
Thanks, Roger.
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next prev parent reply other threads:[~2018-03-20 8:58 UTC|newest]
Thread overview: 155+ messages / expand[flat|nested] mbox.gz Atom feed top
2018-03-12 18:33 [RFC PATCH 00/30] Xen Q35 Bringup patches + support for PCIe Extended Capabilities for passed through devices Alexey Gerasimenko
2018-03-12 18:33 ` [RFC PATCH 01/12] libacpi: new DSDT ACPI table for Q35 Alexey Gerasimenko
2018-03-12 19:38 ` Konrad Rzeszutek Wilk
2018-03-12 20:10 ` Alexey G
2018-03-12 20:32 ` Konrad Rzeszutek Wilk
2018-03-12 21:19 ` Alexey G
2018-03-13 2:41 ` Tian, Kevin
2018-03-19 12:43 ` Roger Pau Monné
2018-03-19 13:57 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 02/12] Makefile: build and use new DSDT " Alexey Gerasimenko
2018-03-19 12:46 ` Roger Pau Monné
2018-03-19 14:18 ` Alexey G
2018-03-19 13:07 ` Jan Beulich
2018-03-19 14:10 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 03/12] hvmloader: add function to query an emulated machine type (i440/Q35) Alexey Gerasimenko
2018-03-13 17:26 ` Wei Liu
2018-03-13 17:58 ` Alexey G
2018-03-13 18:04 ` Wei Liu
2018-03-19 12:56 ` Roger Pau Monné
2018-03-19 16:26 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 04/12] hvmloader: add ACPI enabling for Q35 Alexey Gerasimenko
2018-03-13 17:26 ` Wei Liu
2018-03-19 13:01 ` Roger Pau Monné
2018-03-19 23:59 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 05/12] hvmloader: add Q35 DSDT table loading Alexey Gerasimenko
2018-03-19 14:45 ` Roger Pau Monné
2018-03-20 0:15 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 06/12] hvmloader: add basic Q35 support Alexey Gerasimenko
2018-03-19 15:30 ` Roger Pau Monné
2018-03-19 23:44 ` Alexey G
2018-03-20 9:20 ` Roger Pau Monné
2018-03-20 21:23 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 07/12] hvmloader: allocate MMCONFIG area in the MMIO hole + minor code refactoring Alexey Gerasimenko
2018-03-19 15:58 ` Roger Pau Monné
2018-03-19 19:49 ` Alexey G
2018-03-20 8:50 ` Roger Pau Monné
2018-03-20 9:25 ` Paul Durrant
2018-03-21 0:58 ` Alexey G
2018-03-21 9:09 ` Roger Pau Monné
2018-03-21 9:36 ` Paul Durrant
2018-03-21 14:35 ` Alexey G
2018-03-21 14:58 ` Paul Durrant
2018-03-21 14:25 ` Alexey G
2018-03-21 14:54 ` Paul Durrant
2018-03-21 17:41 ` Alexey G
2018-03-21 15:20 ` Roger Pau Monné
2018-03-21 16:56 ` Alexey G
2018-03-21 17:06 ` Paul Durrant
2018-03-22 0:31 ` Alexey G
2018-03-22 9:04 ` Jan Beulich
2018-03-22 9:55 ` Alexey G
2018-03-22 10:06 ` Paul Durrant
2018-03-22 11:56 ` Alexey G
2018-03-22 12:09 ` Jan Beulich
2018-03-22 13:05 ` Alexey G
2018-03-22 13:20 ` Jan Beulich
2018-03-22 14:34 ` Alexey G
2018-03-22 14:42 ` Jan Beulich
2018-03-22 15:08 ` Alexey G
2018-03-23 13:57 ` Paul Durrant
2018-03-23 22:32 ` Alexey G
2018-03-26 9:24 ` Roger Pau Monné
2018-03-26 19:42 ` Alexey G
2018-03-27 8:45 ` Roger Pau Monné
2018-03-27 15:37 ` Alexey G
2018-03-28 9:30 ` Roger Pau Monné
2018-03-28 11:42 ` Alexey G
2018-03-28 12:05 ` Paul Durrant
2018-03-28 10:03 ` Paul Durrant
2018-03-28 14:14 ` Alexey G
2018-03-21 17:15 ` Roger Pau Monné
2018-03-21 22:49 ` Alexey G
2018-03-22 9:29 ` Paul Durrant
2018-03-22 10:05 ` Roger Pau Monné
2018-03-22 10:09 ` Paul Durrant
2018-03-22 11:36 ` Alexey G
2018-03-22 10:50 ` Alexey G
2018-03-22 9:57 ` Roger Pau Monné
2018-03-22 12:29 ` Alexey G
2018-03-22 12:44 ` Roger Pau Monné
2018-03-22 15:31 ` Alexey G
2018-03-23 10:29 ` Paul Durrant
2018-03-23 11:38 ` Jan Beulich
2018-03-23 13:52 ` Paul Durrant
2018-05-29 14:23 ` Jan Beulich
2018-05-29 17:56 ` Alexey G
2018-05-29 18:47 ` Alexey G
2018-05-30 4:32 ` Alexey G
2018-05-30 8:13 ` Jan Beulich
2018-05-31 4:25 ` Alexey G
2018-05-30 8:12 ` Jan Beulich
2018-05-31 5:15 ` Alexey G
2018-06-01 5:30 ` Jan Beulich
2018-06-01 15:53 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 08/12] libxl: Q35 support (new option device_model_machine) Alexey Gerasimenko
2018-03-13 17:25 ` Wei Liu
2018-03-13 17:32 ` Anthony PERARD
2018-03-19 17:01 ` Roger Pau Monné
2018-03-19 22:11 ` Alexey G
2018-03-20 9:11 ` Roger Pau Monné
2018-03-21 16:27 ` Wei Liu
2018-03-21 17:03 ` Anthony PERARD
2018-03-21 16:25 ` Wei Liu
2018-03-12 18:33 ` [RFC PATCH 09/12] libxl: Xen Platform device support for Q35 Alexey Gerasimenko
2018-03-19 15:05 ` Alexey G
2018-03-21 16:32 ` Wei Liu
2018-03-12 18:33 ` [RFC PATCH 10/12] libacpi: build ACPI MCFG table if requested Alexey Gerasimenko
2018-03-19 17:33 ` Roger Pau Monné
2018-03-19 21:46 ` Alexey G
2018-03-20 9:03 ` Roger Pau Monné
2018-03-20 21:06 ` Alexey G
2018-05-29 14:36 ` Jan Beulich
2018-05-29 18:20 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 11/12] hvmloader: use libacpi to build MCFG table Alexey Gerasimenko
2018-03-14 17:48 ` Alexey G
2018-03-19 17:49 ` Roger Pau Monné
2018-03-19 21:20 ` Alexey G
2018-03-20 8:58 ` Roger Pau Monné [this message]
2018-03-20 9:36 ` Jan Beulich
2018-03-20 20:53 ` Alexey G
2018-03-21 7:36 ` Jan Beulich
2018-05-29 14:46 ` Jan Beulich
2018-05-29 17:26 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 12/12] docs: provide description for device_model_machine option Alexey Gerasimenko
2018-03-12 18:33 ` [RFC PATCH 13/30] pc/xen: Xen Q35 support: provide IRQ handling for PCI devices Alexey Gerasimenko
2018-03-14 10:48 ` Paolo Bonzini
[not found] ` <406abf99-4311-f08d-9f61-df72a9a3ef05@redhat.com>
2018-03-14 11:28 ` Alexey G
2018-03-12 18:33 ` [RFC PATCH 14/30] pc/q35: Apply PCI bus BSEL property for Xen PCI device hotplug Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 15/30] q35/acpi/xen: Provide ACPI PCI hotplug interface for Xen on Q35 Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 16/30] q35/xen: Add Xen platform device support for Q35 Alexey Gerasimenko
2018-03-12 19:44 ` Eduardo Habkost
[not found] ` <20180312194406.GX3417@localhost.localdomain>
2018-03-12 20:56 ` Alexey G
2018-03-12 21:44 ` Eduardo Habkost
[not found] ` <20180312214402.GY3417@localhost.localdomain>
2018-03-13 23:49 ` Alexey G
2018-03-13 9:24 ` [Qemu-devel] " Daniel P. Berrangé
2018-03-12 18:34 ` [RFC PATCH 17/30] q35: Fix incorrect values for PCIEXBAR masks Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 18/30] xen/pt: XenHostPCIDevice: provide functions for PCI Capabilities and PCIe Extended Capabilities enumeration Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 19/30] xen/pt: avoid reading PCIe device type and cap version multiple times Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 20/30] xen/pt: determine the legacy/PCIe mode for a passed through device Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 21/30] xen/pt: Xen PCIe passthrough support for Q35: bypass PCIe topology check Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 22/30] xen/pt: add support for PCIe Extended Capabilities and larger config space Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 23/30] xen/pt: handle PCIe Extended Capabilities Next register Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 24/30] xen/pt: allow to hide PCIe Extended Capabilities Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 25/30] xen/pt: add Vendor-specific PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 26/30] xen/pt: add fixed-size PCIe Extended Capabilities descriptors Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 27/30] xen/pt: add AER PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 28/30] xen/pt: add descriptors and size calculation for RCLD/ACS/PMUX/DPA/MCAST/TPH/DPC PCIe Extended Capabilities Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 29/30] xen/pt: add Resizable BAR PCIe Extended Capability descriptor and sizing Alexey Gerasimenko
2018-03-12 18:34 ` [RFC PATCH 30/30] xen/pt: add VC/VC9/MFVC PCIe Extended Capabilities descriptors " Alexey Gerasimenko
2018-03-13 9:21 ` [Qemu-devel] [RFC PATCH 00/30] Xen Q35 Bringup patches + support for PCIe Extended Capabilities for passed through devices Daniel P. Berrangé
2018-03-13 11:37 ` Alexey G
2018-03-13 11:44 ` Daniel P. Berrangé
2018-03-16 17:34 ` Alexey G
2018-03-16 18:26 ` Stefano Stabellini
2018-03-16 18:36 ` Roger Pau Monné
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