linux-kernel - [RFC v1 1/2] vfio/pci: Expose PCIe PASID capability to guest

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Message-Id: <1580300325-86259-2-git-send-email-yi.l.liu@intel.com>
Date:   Wed, 29 Jan 2020 04:18:44 -0800
From:   "Liu, Yi L" <yi.l.liu@...el.com>
To:     alex.williamson@...hat.com, eric.auger@...hat.com
Cc:     kevin.tian@...el.com, jacob.jun.pan@...ux.intel.com,
        joro@...tes.org, ashok.raj@...el.com, yi.l.liu@...el.com,
        jun.j.tian@...el.com, yi.y.sun@...el.com,
        jean-philippe.brucker@....com, peterx@...hat.com,
        iommu@...ts.linux-foundation.org, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org
Subject: [RFC v1 1/2] vfio/pci: Expose PCIe PASID capability to guest

From: Liu Yi L <yi.l.liu@...el.com>

This patch exposes PCIe PASID capability to guest. Existing vfio_pci
driver hides it from guest by setting the capability length as 0 in
pci_ext_cap_length[].

This capability is required for vSVA enabling on pass-through PCIe
devices.

Cc: Kevin Tian <kevin.tian@...el.com>
CC: Jacob Pan <jacob.jun.pan@...ux.intel.com>
Cc: Alex Williamson <alex.williamson@...hat.com>
Cc: Eric Auger <eric.auger@...hat.com>
Cc: Jean-Philippe Brucker <jean-philippe.brucker@....com>
Signed-off-by: Liu Yi L <yi.l.liu@...el.com>
---
 drivers/vfio/pci/vfio_pci_config.c | 2 +-
 1 file changed, 1 insertion(+), 1 deletion(-)

diff --git a/drivers/vfio/pci/vfio_pci_config.c b/drivers/vfio/pci/vfio_pci_config.c
index 90c0b80..4b9af99 100644
--- a/drivers/vfio/pci/vfio_pci_config.c
+++ b/drivers/vfio/pci/vfio_pci_config.c
@@ -95,7 +95,7 @@ static const u16 pci_ext_cap_length[PCI_EXT_CAP_ID_MAX + 1] = {
 	[PCI_EXT_CAP_ID_LTR]	=	PCI_EXT_CAP_LTR_SIZEOF,
 	[PCI_EXT_CAP_ID_SECPCI]	=	0,	/* not yet */
 	[PCI_EXT_CAP_ID_PMUX]	=	0,	/* not yet */
-	[PCI_EXT_CAP_ID_PASID]	=	0,	/* not yet */
+	[PCI_EXT_CAP_ID_PASID]	=	PCI_EXT_CAP_PASID_SIZEOF,
 };
 
 /*
-- 
2.7.4