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[PATCH v11 15/17] xen/arm: account IO handlers for emulated PCI MSI-X
- To: "xen-devel@xxxxxxxxxxxxxxxxxxxx" <xen-devel@xxxxxxxxxxxxxxxxxxxx>
- From: Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Date: Sat, 2 Dec 2023 01:27:07 +0000
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- Cc: Stewart Hildebrand <stewart.hildebrand@xxxxxxx>, Oleksandr Andrushchenko <Oleksandr_Andrushchenko@xxxxxxxx>, Stefano Stabellini <sstabellini@xxxxxxxxxx>, Julien Grall <julien@xxxxxxx>, Bertrand Marquis <bertrand.marquis@xxxxxxx>, Michal Orzel <michal.orzel@xxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>, Julien Grall <jgrall@xxxxxxxxxx>, Volodymyr Babchuk <Volodymyr_Babchuk@xxxxxxxx>
- Delivery-date: Sat, 02 Dec 2023 01:27:30 +0000
- List-id: Xen developer discussion <xen-devel.lists.xenproject.org>
- Thread-index: AQHaJL6p9eGZ4W17RUGnV1K8Sgg+4w==
- Thread-topic: [PATCH v11 15/17] xen/arm: account IO handlers for emulated PCI MSI-X
From: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
At the moment, we always allocate an extra 16 slots for IO handlers
(see MAX_IO_HANDLER). So while adding IO trap handlers for the emulated
MSI-X registers we need to explicitly tell that we have additional IO
handlers, so those are accounted.
Signed-off-by: Oleksandr Andrushchenko <oleksandr_andrushchenko@xxxxxxxx>
Acked-by: Julien Grall <jgrall@xxxxxxxxxx>
Signed-off-by: Volodymyr Babchuk <volodymyr_babchuk@xxxxxxxx>
---
This actually moved here from the part 2 of the prep work for PCI
passthrough on Arm as it seems to be the proper place for it.
Since v5:
- optimize with IS_ENABLED(CONFIG_HAS_PCI_MSI) since VPCI_MAX_VIRT_DEV is
defined unconditionally
New in v5
---
xen/arch/arm/vpci.c | 14 +++++++++++++-
1 file changed, 13 insertions(+), 1 deletion(-)
diff --git a/xen/arch/arm/vpci.c b/xen/arch/arm/vpci.c
index 7a6a0017d1..348ba0fbc8 100644
--- a/xen/arch/arm/vpci.c
+++ b/xen/arch/arm/vpci.c
@@ -130,6 +130,8 @@ static int vpci_get_num_handlers_cb(struct domain *d,
unsigned int domain_vpci_get_num_mmio_handlers(struct domain *d)
{
+ unsigned int count;
+
if ( !has_vpci(d) )
return 0;
@@ -150,7 +152,17 @@ unsigned int domain_vpci_get_num_mmio_handlers(struct
domain *d)
* For guests each host bridge requires one region to cover the
* configuration space. At the moment, we only expose a single host bridge.
*/
- return 1;
+ count = 1;
+
+ /*
+ * There's a single MSI-X MMIO handler that deals with both PBA
+ * and MSI-X tables per each PCI device being passed through.
+ * Maximum number of emulated virtual devices is VPCI_MAX_VIRT_DEV.
+ */
+ if ( IS_ENABLED(CONFIG_HAS_PCI_MSI) )
+ count += VPCI_MAX_VIRT_DEV;
+
+ return count;
}
/*
--
2.42.0
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