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Re: [Qemu-devel] [PATCH] msix: fix msix_vector_masked
From: |
Michael S. Tsirkin |
Subject: |
Re: [Qemu-devel] [PATCH] msix: fix msix_vector_masked |
Date: |
Mon, 15 Feb 2016 13:34:48 +0200 |
On Mon, Feb 15, 2016 at 10:15:12AM +0000, Stefano Stabellini wrote:
> On Sat, 13 Feb 2016, Michael S. Tsirkin wrote:
> > commit 428c3ece97179557f2753071fb0ca97a03437267 ("fix MSI injection on Xen")
> > inadvertently enabled the xen-specific logic unconditionally.
> > Limit it to only when xen is enabled.
> > Additionally, msix data should be read with pci_get_log
> > since the format is pci little-endian.
> >
> > Reported-by: "Daniel P. Berrange" <address@hidden>
> > Cc: Stefano Stabellini <address@hidden>
> > Signed-off-by: Michael S. Tsirkin <address@hidden>
>
> Thanks Daniel for finding the issue and thanks Michael for fixing my
> bug, sorry about that.
>
>
> > hw/pci/msix.c | 4 ++--
> > 1 file changed, 2 insertions(+), 2 deletions(-)
> >
> > diff --git a/hw/pci/msix.c b/hw/pci/msix.c
> > index eb4ef11..537fdba 100644
> > --- a/hw/pci/msix.c
> > +++ b/hw/pci/msix.c
> > @@ -80,10 +80,10 @@ static void msix_clr_pending(PCIDevice *dev, int vector)
> > static bool msix_vector_masked(PCIDevice *dev, unsigned int vector, bool
> > fmask)
> > {
> > unsigned offset = vector * PCI_MSIX_ENTRY_SIZE;
> > - uint32_t *data = (uint32_t *)&dev->msix_table[offset +
> > PCI_MSIX_ENTRY_DATA];
> > + uint8_t *data = &dev->msix_table[offset + PCI_MSIX_ENTRY_DATA];
> > /* MSIs on Xen can be remapped into pirqs. In those cases, masking
> > * and unmasking go through the PV evtchn path. */
> > - if (xen_is_pirq_msi(*data)) {
> > + if (xen_enabled() && xen_is_pirq_msi(pci_get_long(data))) {
> > return false;
> > }
> > return fmask || dev->msix_table[offset + PCI_MSIX_ENTRY_VECTOR_CTRL] &
>
> I think this is good, but moving the xen_enabled() check inside
> xen_is_pirq_msi is even be better, so that we cover all call sites at
> once.
Feel free to post a patch on top.
>
> diff --git a/xen-hvm.c b/xen-hvm.c
> index 039680a..991f6b7 100644
> --- a/xen-hvm.c
> +++ b/xen-hvm.c
> @@ -151,7 +151,8 @@ int xen_is_pirq_msi(uint32_t msi_data)
> /* If vector is 0, the msi is remapped into a pirq, passed as
> * dest_id.
> */
> - return ((msi_data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT) == 0;
> + return xen_enabled() &&
> + ((msi_data & MSI_DATA_VECTOR_MASK) >> MSI_DATA_VECTOR_SHIFT) == 0;
> }
>
> void xen_hvm_inject_msi(uint64_t addr, uint32_t data)