On 2015/12/17 4:14, Alex Williamson wrote:
On Fri, 2015-12-11 at 16:53 +0800, Yongji Xie wrote:
Current vfio-pci implementation disallows to mmap MSI-X table in
case that user get to touch this directly.
However, EEH mechanism could ensure that a given pci device
can only shoot the MSIs
On 2015/12/17 4:04, Alex Williamson wrote:
On Fri, 2015-12-11 at 16:53 +0800, Yongji Xie wrote:
Current vfio-pci implementation disallows to mmap
sub-page(size < PAGE_SIZE) MMIO BARs because these BARs' mmio page
may be shared with other BARs.
But we should allow to mmap these sub-page M
her BARs.
This patch adds support for this case and we also add a
VFIO_DEVICE_FLAGS_PCI_PAGE_ALIGNED flag to notify userspace that
platform supports all MMIO BARs to be page aligned.
Signed-off-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
drivers/vfio/pci/vfio_pci.c
-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
arch/powerpc/kernel/pci-common.c | 10 +-
1 file changed, 9 insertions(+), 1 deletion(-)
diff --git a/arch/powerpc/kernel/pci-common.c b/arch/powerpc/kernel/pci-common.c
index 0f7a60f..6989e0f 100644
--- a/arch/powerpc/kernel/pci-common.c
On 2015/12/18 5:46, Alex Williamson wrote:
On Thu, 2015-12-17 at 18:26 +0800, yongji xie wrote:
On 2015/12/17 4:04, Alex Williamson wrote:
On Fri, 2015-12-11 at 16:53 +0800, Yongji Xie wrote:
Current vfio-pci implementation disallows to mmap
sub-page(size < PAGE_SIZE) MMIO BARs beca
orm
support all PCI BARs are page aligned.
- Add support for a VFIO-PCI ioctl to indicate that platform
support mmapping MSI-X table.
Yongji Xie (3):
powerpc/pci: Enforce all MMIO BARs to be page aligned
vfio-pci: Allow to mmap sub-page MMIO BARs if all MMIO BARs are p
userspace that it's safe to mmap MSI-X table.
Signed-off-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
drivers/vfio/pci/vfio_pci.c |5 -
drivers/vfio/pci/vfio_pci_private.h |5 +
include/uapi/linux/vfio.h |2 ++
3 files changed, 11 insertions(+), 1 de
ags: VFIO_DEVICE_FLAGS_PCI_PAGE_ALIGNED
VFIO_DEVICE_FLAGS_PCI_MSIX_MMAP
- Add a Kconfig option to support for mmapping MSI-X table.
[1] https://lkml.org/lkml/2015/11/23/748
Yongji Xie (3):
PCI: Add support for enforcing all MMIO BARs to be page aligned
vfio-pci: Allow to mmap sub-page MMIO BARs if all MMIO B
IZE.
Signed-off-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
drivers/vfio/pci/vfio_pci.c |7 ++-
1 file changed, 6 insertions(+), 1 deletion(-)
diff --git a/drivers/vfio/pci/vfio_pci.c b/drivers/vfio/pci/vfio_pci.c
index 7e9f497..09b3805 100644
--- a/drivers/vfio/pci/vfio_pci.c
+++
for mmapping MSI-X table.
Signed-off-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
drivers/vfio/pci/Kconfig|4
drivers/vfio/pci/vfio_pci.c |6 --
2 files changed, 8 insertions(+), 2 deletions(-)
diff --git a/drivers/vfio/pci/Kconfig b/drivers/vfio/pci/Kconfig
index 0
ts PAGE_SIZE is 64KB.
Signed-off-by: Yongji Xie <xyj...@linux.vnet.ibm.com>
---
Documentation/kernel-parameters.txt |4
arch/powerpc/include/asm/pci.h | 11 +++
drivers/pci/pci.c | 17 +
drivers/pci/pci.h |7 ++
On 2016/1/5 5:42, Benjamin Herrenschmidt wrote:
On Mon, 2016-01-04 at 14:07 -0700, Alex Williamson wrote:
On Thu, 2015-12-31 at 16:50 +0800, Yongji Xie wrote:
Current vfio-pci implementation disallows to mmap MSI-X
table in case that user get to touch this directly.
However, EEH mechanism can
On 2016/1/5 4:47, Alex Williamson wrote:
On Thu, 2015-12-31 at 16:50 +0800, Yongji Xie wrote:
When vfio passthrough a PCI device of which MMIO BARs
are smaller than PAGE_SIZE, guest will not handle the
mmio accesses to the BARs which leads to mmio emulations
in host.
This is because vfio
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