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[common/idd] recovery: reserve IVSHMEM control region

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Define a fixed, protocol-independent recovery ABI in the final 64 KiB
of IVSHMEM.

Provide crash-safe multi-client requests and coherent producer status.

Exclude the region from LGMP allocation and frame capacity so future
protocol mismatches retain a stable control path.
This commit is contained in:
Geoffrey McRae
2026-08-11 22:08:34 +10:00
parent 61a49ebaba
commit 9898e9bcec
5 changed files with 285 additions and 6 deletions
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21
idd/LGIdd/transport/lgmp/CIVSHMEM.h
View File

@@ -24,6 +24,8 @@
#include <SetupAPI.h>
#include <vector>
#include "common/KVMFRRecovery.h"
class CIVSHMEM
{
private:
@@ -46,6 +48,21 @@ public:
bool Open();
void Close();
size_t GetSize() const { return m_size; }
void * GetMem () const { return m_mem; }
size_t GetFullSize () const { return m_size; }
size_t GetUsableSize () const
{
if (m_size < KVMFR_R_REGION_SIZE)
return 0;
return m_size - KVMFR_R_REGION_SIZE;
}
void * GetMem () const { return m_mem; }
void * GetRecoveryMem () const
{
if (!m_mem || m_size < KVMFR_R_REGION_SIZE)
return nullptr;
return static_cast<uint8_t *>(m_mem) + GetUsableSize();
}
};

4
idd/LGIdd/transport/lgmp/CLGMPFrameTransport.cpp
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@@ -119,7 +119,7 @@ bool CLGMPFrameTransport::Initialize()
void CLGMPFrameTransport::SealMemoryLayout()
{
m_frameMemoryOffset =
m_ivshmem.GetSize() - m_host.Available();
m_ivshmem.GetUsableSize() - m_host.Available();
}
bool CLGMPFrameTransport::Setup(size_t alignSize)
@@ -246,7 +246,7 @@ void CLGMPFrameTransport::DeInit()
FrameMemoryLimits CLGMPFrameTransport::GetMemoryLimits() const
{
FrameMemoryLimits limits;
limits.capacity = m_ivshmem.GetSize();
limits.capacity = m_ivshmem.GetUsableSize();
limits.frameMemoryOffset = m_frameMemoryOffset;
limits.alignment = m_alignSize;
limits.maxFrameSize = m_maxFrameSize;

3
idd/LGIdd/transport/lgmp/CLGMPHost.cpp
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@@ -119,7 +119,8 @@ bool CLGMPHost::Initialize(CIVSHMEM& ivshmem)
LGMP_STATUS status;
std::string udata = ss.str();
if ((status = lgmpHostInit(ivshmem.GetMem(), (uint32_t)ivshmem.GetSize(),
if ((status = lgmpHostInit(ivshmem.GetMem(),
(uint32_t)ivshmem.GetUsableSize(),
&m_host, (uint32_t)udata.size(), (uint8_t*)&udata[0])) != LGMP_OK)
{
DEBUG_ERROR("lgmpHostInit Failed: %s", lgmpStatusString(status));

2
idd/LGIdd/transport/lgmp/CLGMPTransport.cpp
View File

@@ -181,5 +181,5 @@ FrameMemoryLimits CLGMPTransport::GetMemoryLimits() const
DirectFrameBufferMemory CLGMPTransport::GetDirectMemory() const
{
return {m_ivshmem.GetMem(), m_ivshmem.GetSize()};
return {m_ivshmem.GetMem(), m_ivshmem.GetFullSize()};
}