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xen/MSI-X: latch MSI-X table writes

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The remaining log message in pci_msix_write() is wrong, as there guest
behavior may only appear to be wrong: For one, the old logic didn't
take the mask-all bit into account. And then this shouldn't depend on
host device state (i.e. the host may have masked the entry without the
guest having done so). Plus these writes shouldn't be dropped even when
an entry gets unmasked. Instead, if they can't be made take effect
right away, they should take effect on the next unmasking or enabling
operation - the specification explicitly describes such caching
behavior.

Signed-off-by: Jan Beulich <jbeulich@suse.com>
Signed-off-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
Reviewed-by: Stefano Stabellini <stefano.stabellini@eu.citrix.com>
This commit is contained in:
Jan Beulich 2015-12-09 15:45:29 +00:00 • committed by Stefano Stabellini
parent c3626ca7df
commit f0ada3608a
3 changed files with 32 additions and 48 deletions
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2
hw/xen/xen_pt_config_init.c
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@ -1499,6 +1499,8 @@ static int xen_pt_msixctrl_reg_write(XenPCIPassthroughState *s,
xen_pt_msix_disable(s);
}
s->msix->maskall = *val & PCI_MSIX_FLAGS_MASKALL;
debug_msix_enabled_old = s->msix->enabled;
s->msix->enabled = !!(*val & PCI_MSIX_FLAGS_ENABLE);
if (s->msix->enabled != debug_msix_enabled_old) {