[Xen-devel] [PATCH 3/3] xen/MSI: Retrieve MSI msg from cached msi_desc->msg

[Yijing Wang <wangyijing@xxxxxxxxxx>]

We had cached the MSI msg in __write_msi_msg(),
so we should retrieve the cached MSI msg directly,
not to access the MSI address/data hardware registers
again.

Signed-off-by: Yijing Wang <wangyijing@xxxxxxxxxx>
CC: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx>
CC: xen-devel@xxxxxxxxxxxxxxxxxxxx
---
 arch/x86/pci/xen.c |    2 +-
 1 files changed, 1 insertions(+), 1 deletions(-)

diff --git a/arch/x86/pci/xen.c b/arch/x86/pci/xen.c
index 4656099..7a74404 100644
--- a/arch/x86/pci/xen.c
+++ b/arch/x86/pci/xen.c
@@ -228,7 +228,7 @@ static int xen_hvm_setup_msi_irqs(struct pci_dev *dev, int 
nvec, int type)
                return 1;
 
        list_for_each_entry(msidesc, &dev->msi_list, list) {
-               read_msi_msg(msidesc, &msg);
+               get_cached_msi_msg(msidesc, &msg);
                pirq = MSI_ADDR_EXT_DEST_ID(msg.address_hi) |
                        ((msg.address_lo >> MSI_ADDR_DEST_ID_SHIFT) & 0xff);
                if (msg.data != XEN_PIRQ_MSI_DATA ||
-- 
1.7.1


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