| Message ID | 4a23d5ec655fd00da97b0b0b46174a3a3894bfb0.camel@linux.ibm.com (mailing list archive) |
|---|---|
| Headers | show |
| Series | powerpc/pseries/vas: VAS/NXGZIP support with LPM | expand |
Excerpts from Haren Myneni's message of February 20, 2022 6:04 am: > > Virtual Accelerator Switchboard (VAS) is an engine stays on the > chip. So all windows opened on a specific engine belongs to VAS > the chip. The problem is more that PAPR does not virtualise the VAS windows, right? That's a whole other gripe but nothing you can do about it here. Thanks, Nick > The hypervisor expects the partition to close all > active windows on the sources system and reopen them after > migration on the destination machine. > > This patch series adds VAS support with the partition migration. > When the migration initiates, the VAS migration handler will be > invoked before pseries_suspend() to close all active windows and > mark them in-active with VAS_WIN_MIGRATE_CLOSE status. Whereas > this migration handler is called after migration to reopen all > windows which has VAS_WIN_MIGRATE_CLOSE status and make them > active again. The user space gets paste instruction failure > when it sends requests on these in-active windows. > > These patches depend on VAS/DLPAR support patch series > > Changes in v2: > - Added new patch "Define global hv_cop_caps struct" to eliminate > memory allocation failure during migration (suggestion by > Nathan Lynch) > > Changes in v3: > - Rebase on 5.17-rc4 > - Naming changes for VAS capability struct elemets based on the V4 DLPAR > support patch series. > > Haren Myneni (4): > powerpc/pseries/vas: Define global hv_cop_caps struct > powerpc/pseries/vas: Modify reconfig open/close functions for > migration > powerpc/pseries/vas: Add VAS migration handler > powerpc/pseries/vas: Disable window open during migration > > arch/powerpc/include/asm/vas.h | 2 + > arch/powerpc/platforms/pseries/mobility.c | 5 + > arch/powerpc/platforms/pseries/vas.c | 234 +++++++++++++++++----- > arch/powerpc/platforms/pseries/vas.h | 6 + > 4 files changed, 201 insertions(+), 46 deletions(-) > > -- > 2.27.0 > > >
On Wed, 2022-02-23 at 19:38 +1000, Nicholas Piggin wrote: > Excerpts from Haren Myneni's message of February 20, 2022 6:04 am: > > Virtual Accelerator Switchboard (VAS) is an engine stays on the > > chip. So all windows opened on a specific engine belongs to VAS > > the chip. > > The problem is more that PAPR does not virtualise the VAS windows, > right? That's a whole other gripe but nothing you can do about it > here. Yes, There is no virtualization with VAS windows and they are specific to the chip. > > Thanks, > Nick > > > The hypervisor expects the partition to close all > > active windows on the sources system and reopen them after > > migration on the destination machine. > > > > This patch series adds VAS support with the partition migration. > > When the migration initiates, the VAS migration handler will be > > invoked before pseries_suspend() to close all active windows and > > mark them in-active with VAS_WIN_MIGRATE_CLOSE status. Whereas > > this migration handler is called after migration to reopen all > > windows which has VAS_WIN_MIGRATE_CLOSE status and make them > > active again. The user space gets paste instruction failure > > when it sends requests on these in-active windows. > > > > These patches depend on VAS/DLPAR support patch series > > > > Changes in v2: > > - Added new patch "Define global hv_cop_caps struct" to eliminate > > memory allocation failure during migration (suggestion by > > Nathan Lynch) > > > > Changes in v3: > > - Rebase on 5.17-rc4 > > - Naming changes for VAS capability struct elemets based on the V4 > > DLPAR > > support patch series. > > > > Haren Myneni (4): > > powerpc/pseries/vas: Define global hv_cop_caps struct > > powerpc/pseries/vas: Modify reconfig open/close functions for > > migration > > powerpc/pseries/vas: Add VAS migration handler > > powerpc/pseries/vas: Disable window open during migration > > > > arch/powerpc/include/asm/vas.h | 2 + > > arch/powerpc/platforms/pseries/mobility.c | 5 + > > arch/powerpc/platforms/pseries/vas.c | 234 +++++++++++++++++- > > ---- > > arch/powerpc/platforms/pseries/vas.h | 6 + > > 4 files changed, 201 insertions(+), 46 deletions(-) > > > > -- > > 2.27.0 > > > > > >
Virtual Accelerator Switchboard (VAS) is an engine stays on the chip. So all windows opened on a specific engine belongs to VAS the chip. The hypervisor expects the partition to close all active windows on the sources system and reopen them after migration on the destination machine. This patch series adds VAS support with the partition migration. When the migration initiates, the VAS migration handler will be invoked before pseries_suspend() to close all active windows and mark them in-active with VAS_WIN_MIGRATE_CLOSE status. Whereas this migration handler is called after migration to reopen all windows which has VAS_WIN_MIGRATE_CLOSE status and make them active again. The user space gets paste instruction failure when it sends requests on these in-active windows. These patches depend on VAS/DLPAR support patch series Changes in v2: - Added new patch "Define global hv_cop_caps struct" to eliminate memory allocation failure during migration (suggestion by Nathan Lynch) Changes in v3: - Rebase on 5.17-rc4 - Naming changes for VAS capability struct elemets based on the V4 DLPAR support patch series. Haren Myneni (4): powerpc/pseries/vas: Define global hv_cop_caps struct powerpc/pseries/vas: Modify reconfig open/close functions for migration powerpc/pseries/vas: Add VAS migration handler powerpc/pseries/vas: Disable window open during migration arch/powerpc/include/asm/vas.h | 2 + arch/powerpc/platforms/pseries/mobility.c | 5 + arch/powerpc/platforms/pseries/vas.c | 234 +++++++++++++++++----- arch/powerpc/platforms/pseries/vas.h | 6 + 4 files changed, 201 insertions(+), 46 deletions(-)