Allow single byte reads of the emulated MSI-X tables. This is not required
by the PCI specification but needed to dump MMIO space from "ddb" in the guest.
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Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=254965
@ -245,8 +245,12 @@ pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size)
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int tab_index;
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uint64_t retval = ~0;
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/* support only 4 or 8 byte reads */
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if (size != 4 && size != 8)
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/*
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* The PCI standard only allows 4 and 8 byte accesses to the MSI-X
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* table but we also allow 1 byte access to accomodate reads from
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* ddb.
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*/
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if (size != 1 && size != 4 && size != 8)
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return (retval);
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msix_entry_offset = offset % MSIX_TABLE_ENTRY_SIZE;
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@ -263,7 +267,9 @@ pci_emul_msix_tread(struct pci_devinst *pi, uint64_t offset, int size)
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dest = (char *)(pi->pi_msix.table + tab_index);
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dest += msix_entry_offset;
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if (size == 4)
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if (size == 1)
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retval = *((uint8_t *)dest);
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else if (size == 4)
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retval = *((uint32_t *)dest);
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else
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retval = *((uint64_t *)dest);
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