It's legal that the guest reads a single byte or word from mmio.
I have an OS which reads single bytes and it works fine on real
hardware. Maybe this happens due to casting.
Signed-off-by: Bernhard Kohl <bernhard.k...@nsn.com>
---
hw/msix.c | 20 ++++++++++++++++----
1 files changed, 16 insertions(+), 4 deletions(-)
diff --git a/hw/msix.c b/hw/msix.c
index d99403a..7dac7f7 100644
--- a/hw/msix.c
+++ b/hw/msix.c
@@ -100,10 +100,22 @@ static uint32_t msix_mmio_readl(void *opaque,
target_phys_addr_t addr)
return pci_get_long(page + offset);
}
-static uint32_t msix_mmio_read_unallowed(void *opaque,
target_phys_addr_t addr)
+static uint32_t msix_mmio_readw(void *opaque, target_phys_addr_t addr)
{
- fprintf(stderr, "MSI-X: only dword read is allowed!\n");
- return 0;
+ PCIDevice *dev = opaque;
+ unsigned int offset = addr & (MSIX_PAGE_SIZE - 1) & ~0x1;
+ void *page = dev->msix_table_page;
+
+ return pci_get_word(page + offset);
+}
+
+static uint32_t msix_mmio_readb(void *opaque, target_phys_addr_t addr)
+{
+ PCIDevice *dev = opaque;
+ unsigned int offset = addr & (MSIX_PAGE_SIZE - 1);
+ void *page = dev->msix_table_page;
+
+ return pci_get_byte(page + offset);
}
static uint8_t msix_pending_mask(int vector)
@@ -198,7 +210,7 @@ static CPUWriteMemoryFunc * const msix_mmio_write[] = {
};
static CPUReadMemoryFunc * const msix_mmio_read[] = {
- msix_mmio_read_unallowed, msix_mmio_read_unallowed, msix_mmio_readl
+ msix_mmio_readb, msix_mmio_readw, msix_mmio_readl
};
/* Should be called from device's map method. */
--
1.7.2
