From 8129ee164267dc030b8e1d541ee3643c0b9f2fa1 Mon Sep 17 00:00:00 2001 From: Frank Pavlic Date: Fri, 6 Jan 2006 00:19:20 -0800 Subject: [PATCH] s390: qdio V=V pass-through New feature V=V qdio pass-through. QDIO and HiperSockets processing in z/VM V=V guest environments (as well as V=R with z/VM running in LPAR mode) requires shadowing of all QDIO architecture queue elements. Especially the shadowing of SBALs and SLSBs structures in the hypervisor, and the need to issue SIGA SYNC operations to observe state changes, eventually causes significant CPU processing overhead in the hypervisor. The QDIO pass-through support for V=V guests avoids the shadowing of SBALs and SLSBs. This significantly reduces the hypervisor overhead for QDIO based I/O. Signed-off-by: Frank Pavlic Signed-off-by: Martin Schwidefsky Signed-off-by: Andrew Morton Signed-off-by: Linus Torvalds --- include/asm-s390/qdio.h | 8 +++++--- 1 file changed, 5 insertions(+), 3 deletions(-) (limited to 'include/asm-s390') diff --git a/include/asm-s390/qdio.h b/include/asm-s390/qdio.h index 0ddf0a8ef8de..7bc15f0231db 100644 --- a/include/asm-s390/qdio.h +++ b/include/asm-s390/qdio.h @@ -195,12 +195,14 @@ struct qdr { /* * queue information block (QIB) */ -#define QIB_AC_INBOUND_PCI_SUPPORTED 0x80 -#define QIB_AC_OUTBOUND_PCI_SUPPORTED 0x40 +#define QIB_AC_INBOUND_PCI_SUPPORTED 0x80 +#define QIB_AC_OUTBOUND_PCI_SUPPORTED 0x40 +#define QIB_RFLAGS_ENABLE_QEBSM 0x80 + struct qib { unsigned int qfmt : 8; /* queue format */ unsigned int pfmt : 8; /* impl. dep. parameter format */ - unsigned int res1 : 8; /* reserved */ + unsigned int rflags : 8; /* QEBSM */ unsigned int ac : 8; /* adapter characteristics */ unsigned int res2; /* reserved */ #ifdef QDIO_32_BIT -- cgit v1.2.2