On Mon, 20 Feb 2017 19:56:14 -0800
ben@skyportsystems.com wrote:
> From: Ben Warren <ben@skyportsystems.com>
>
> This patch set adds the capability to write to QEMU across the fw_cfg DMA
> link. It adds a higher-level command to write the BIOS-allocated address of
> one fw_cfg file into an arbitrary point within another, writeable fw_cfg file
> across the above-mentioned link.
>
> The initial use case is for Windows VM
> Generation ID, where QEMU needs to change the contents of fw_cfg
> data at runtime, while still having BIOS allocate and manage the memory.
>
> The final corresponding QEMU patch can be found here:
> https://www.mail-archive.com/qemu-devel@nongnu.org/msg430490.html
Tested-by: Igor Mammedov <imammedo@redhat.com>
Tested with WS201R2
* migrated to file and then restored from file
- guest gets notification and new GUID
* make guest go into S3 and resume then migrate to file
- vmgenid_addr_le value is not 0 in migration stream
so SeaBIOS replayed fw_cfg write after reset at S3 resume time
> v6->v7: - minor refactoring of qemu_cfg_write_file* functions
>
> v5->v6: - Rebased to top-of-tree
> - Minor refactoring and conditional execution based on code review
>
> v4->v5: - Minor changes to range checking and data validation
> - Added code for replaying COMMAND_WRITE_POINTER commands on S3 resume
>
> v3->v4: - Added a 'src_offset' field in the message so the pointer need not
> point to the beginning of the file.
> - Changed the command struct definitions from anonymous to named.
>
> v2->v3: - fixed up the qemu_cfg_write* functions to allow writing to an
> arbitrary offset within the destination file.
> - Changed function name to COMMAND_WRITE_POINTER and its functionality
> to not patch memory at all, but write back to a specified offset.
> v1->v2: - separated patch into two functional units.
> - changed so writes only occur over the DMA interface.
> - fixed coding style.
> - removed change to romfile struct definition
> (removed new write_back method).
>
> Ben Warren (5):
> QEMU DMA: Add DMA write capability
> romfile-loader: Switch to using named structs
> QEMU fw_cfg: Add command to write back address of file
> QEMU fw_cfg: Add functions for accessing files by key
> QEMU fw_cfg: Write fw_cfg back on S3 resume
>
> src/fw/paravirt.c | 68 +++++++++++++++++++++++++++++
> src/fw/paravirt.h | 5 +++
> src/fw/romfile_loader.c | 112 ++++++++++++++++++++++++++++++++++++++++--------
> src/fw/romfile_loader.h | 65 ++++++++++++++++++----------
> src/resume.c | 4 ++
> 5 files changed, 214 insertions(+), 40 deletions(-)
>
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