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List: xen-cvs
Subject: [Xen-changelog] [xen master] x86/MSI-X: correctly track interrupt masking state
From: patchbot () xen ! org
Date: 2016-04-27 4:22:42
Message-ID: E1avGzq-0007B7-PX () xenbits ! xenproject ! org
[Download RAW message or body]
commit bd6ad54403019f213e18791b9856e4b7b71a4d47
Author: Jan Beulich <jbeulich@suse.com>
AuthorDate: Mon Apr 25 14:23:07 2016 +0200
Commit: Jan Beulich <jbeulich@suse.com>
CommitDate: Mon Apr 25 14:23:07 2016 +0200
x86/MSI-X: correctly track interrupt masking state
When a guest unmasks MSI-X interrupts before enabling MSI-X on the
device, so far nothing updates the {host,guest}_masked internal state;
this to date only gets done when MSI-X is already enabled. This is why
half way recent Linux works (as it enables MSI-X first), while Windows
doesn't (as it enables MSI-X only after having set up und unmasked all
vectors). Since with a successful write to the vector control field
everything is ready internally, we should also update internal tracking
state there, regardless of the device's MSI-X enabled state.
Signed-off-by: Jan Beulich <jbeulich@suse.com>
Reviewed-by: Andrew Cooper <andrew.cooper3@citrix.com>
Release-acked-by: Wei Liu <wei.liu2@citrix.com>
---
xen/arch/x86/msi.c | 5 +++++
1 file changed, 5 insertions(+)
diff --git a/xen/arch/x86/msi.c b/xen/arch/x86/msi.c
index a46dcf7..8d64ee2 100644
--- a/xen/arch/x86/msi.c
+++ b/xen/arch/x86/msi.c
@@ -434,8 +434,13 @@ static bool_t msi_set_mask_bit(struct irq_desc *desc, bool_t host, bool_t guest)
{
writel(flag, entry->mask_base + PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
readl(entry->mask_base + PCI_MSIX_ENTRY_VECTOR_CTRL_OFFSET);
+
if ( likely(control & PCI_MSIX_FLAGS_ENABLE) )
break;
+
+ entry->msi_attrib.host_masked = host;
+ entry->msi_attrib.guest_masked = guest;
+
flag = 1;
}
else if ( flag && !(control & PCI_MSIX_FLAGS_MASKALL) )
--
generated by git-patchbot for /home/xen/git/xen.git#master
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