From ee6a569d3bf64c9676eee3eecb861fb01cc11311 Mon Sep 17 00:00:00 2001 From: Michael Mueller Date: Wed, 9 Feb 2022 16:22:17 +0100 Subject: KVM: s390: pv: make use of ultravisor AIV support This patch enables the ultravisor adapter interruption vitualization support indicated by UV feature BIT_UV_FEAT_AIV. This allows ISC interruption injection directly into the GISA IPM for PV kvm guests. Hardware that does not support this feature will continue to use the UV interruption interception method to deliver ISC interruptions to PV kvm guests. For this purpose, the ECA_AIV bit for all guest cpus will be cleared and the GISA will be disabled during PV CPU setup. In addition a check in __inject_io() has been removed. That reduces the required instructions for interruption handling for PV and traditional kvm guests. Signed-off-by: Michael Mueller Reviewed-by: Janosch Frank Link: https://lore.kernel.org/r/20220209152217.1793281-2-mimu@linux.ibm.com Reviewed-by: Christian Borntraeger Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/uv.h | 1 + 1 file changed, 1 insertion(+) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/uv.h b/arch/s390/include/asm/uv.h index 86218382d29c..a2d376b8bce3 100644 --- a/arch/s390/include/asm/uv.h +++ b/arch/s390/include/asm/uv.h @@ -80,6 +80,7 @@ enum uv_cmds_inst { enum uv_feat_ind { BIT_UV_FEAT_MISC = 0, + BIT_UV_FEAT_AIV = 1, }; struct uv_cb_header { -- cgit v1.2.3