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Set minimum virtio pci capability bar size

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Or else the virtio drivers would think that they are zero sized
capabilities and will complain about missing capabilities.
This commit is contained in:
Ernest Wong 2018-05-28 20:28:38 +12:00 committed by Fabian
parent 280c9f1e23
commit 78678d27e2
1 changed files with 3 additions and 2 deletions
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5
src/virtio.js
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@ -780,8 +780,9 @@ VirtIO.prototype.init_capabilities = function(capabilities)
var bar_size = cap.struct.reduce((bytes, field) => bytes + field.bytes, 0);
bar_size += cap.offset;
// Round up to next power of 2.
bar_size = bar_size < 2 ? bar_size : 1 << (v86util.int_log2(bar_size - 1) + 1);
// Round up to next power of 2,
// Minimum 16 bytes for its size to be detectable in general (esp. mmio).
bar_size = bar_size < 16 ? 16 : 1 << (v86util.int_log2(bar_size - 1) + 1);
dbg_assert((cap.port & (bar_size - 1)) === 0,
"VirtIO device<" + this.name + "> capability port should be aligned to pci bar size");