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doc: fix doc error in ivshmem mmio registers

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ACRN IVSHMEM follows QEMU IVSHMEM spec. IVSHMEM supports MSIx interrupt
for doorbell mode. The document of ivshmem high level design is
out-of-date. This patch update the mmio register definition of doorbell
mode support.

Tracked-On: #5407

Signed-off-by: Jiayuan Yang <jiayuan.yang@intel.com>
This commit is contained in:
Jiayuan Yang 2024-10-28 21:50:34 -04:00
parent 95859dea34
commit 3a4946ad08
1 changed files with 5 additions and 4 deletions
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9
doc/developer-guides/hld/ivshmem-hld.rst
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@ -107,22 +107,23 @@ MMIO Registers Definition
- 0x0
- R/W
- Interrupt Mask register is used for legacy interrupt.
ivshmem doesn't support interrupts, so this register is reserved.
IVSHMEM doesn't support legacy INTx interrupts, so this register
is reserved.
* - IVSHMEM\_IRQ\_STA\_REG
- 0x4
- R/W
- Interrupt Status register is used for legacy interrupt.
ivshmem doesn't support interrupts, so this register is reserved.
IVSHMEM doesn't support legacy INTx interrupts, so this register
is reserved.
* - IVSHMEM\_IV\_POS\_REG
- 0x8
- RO
- Inter-VM Position register is used to identify the VM ID.
Its value is zero.
Its value is equal to device ID.
* - IVSHMEM\_DOORBELL\_REG
- 0xC
- WO
- Doorbell register is used to trigger an interrupt to the peer VM.
ivshmem doesn't support interrupts.
Usage
*****