From c7901a6ebee4b624971361bbd93f21ab0b359786 Mon Sep 17 00:00:00 2001 From: Michael Mueller Date: Thu, 29 Jun 2017 18:39:27 +0200 Subject: KVM: s390: reverse bit ordering of irqs in pending mask This patch prepares a simplification of bit operations between the irq pending mask for emulated interrupts and the Interruption Pending Mask (IPM) which is part of the Guest Interruption State Area (GISA), a feature that allows interrupt delivery to guests by means of the SIE instruction. Without that change, a bit-wise *or* operation on parts of these two masks would either require a look-up table of size 256 bytes to map the IPM to the emulated irq pending mask bit orientation (all bits mirrored at half byte) or a sequence of up to 8 condidional branches to perform tests of single bit positions. Both options are to be rejected either by performance or space utilization reasons. Beyond that this change will be transparent. Signed-off-by: Michael Mueller Reviewed-by: Halil Pasic Reviewed-by: Pierre Morel Reviewed-by: Christian Borntraeger Reviewed-by: Cornelia Huck Reviewed-by: David Hildenbrand Signed-off-by: Christian Borntraeger --- arch/s390/include/asm/kvm_host.h | 54 ++++++++++++++++++++-------------------- 1 file changed, 27 insertions(+), 27 deletions(-) (limited to 'arch/s390/include') diff --git a/arch/s390/include/asm/kvm_host.h b/arch/s390/include/asm/kvm_host.h index 029e8144c6ec..d2351d63afa3 100644 --- a/arch/s390/include/asm/kvm_host.h +++ b/arch/s390/include/asm/kvm_host.h @@ -422,35 +422,35 @@ struct kvm_vcpu_stat { #define PGM_PER 0x80 #define PGM_CRYPTO_OPERATION 0x119 -/* irq types in order of priority */ +/* irq types in ascend order of priorities */ enum irq_types { - IRQ_PEND_MCHK_EX = 0, - IRQ_PEND_SVC, - IRQ_PEND_PROG, - IRQ_PEND_MCHK_REP, - IRQ_PEND_EXT_IRQ_KEY, - IRQ_PEND_EXT_MALFUNC, - IRQ_PEND_EXT_EMERGENCY, - IRQ_PEND_EXT_EXTERNAL, - IRQ_PEND_EXT_CLOCK_COMP, - IRQ_PEND_EXT_CPU_TIMER, - IRQ_PEND_EXT_TIMING, - IRQ_PEND_EXT_SERVICE, - IRQ_PEND_EXT_HOST, - IRQ_PEND_PFAULT_INIT, - IRQ_PEND_PFAULT_DONE, - IRQ_PEND_VIRTIO, - IRQ_PEND_IO_ISC_0, - IRQ_PEND_IO_ISC_1, - IRQ_PEND_IO_ISC_2, - IRQ_PEND_IO_ISC_3, - IRQ_PEND_IO_ISC_4, - IRQ_PEND_IO_ISC_5, - IRQ_PEND_IO_ISC_6, - IRQ_PEND_IO_ISC_7, - IRQ_PEND_SIGP_STOP, + IRQ_PEND_SET_PREFIX = 0, IRQ_PEND_RESTART, - IRQ_PEND_SET_PREFIX, + IRQ_PEND_SIGP_STOP, + IRQ_PEND_IO_ISC_7, + IRQ_PEND_IO_ISC_6, + IRQ_PEND_IO_ISC_5, + IRQ_PEND_IO_ISC_4, + IRQ_PEND_IO_ISC_3, + IRQ_PEND_IO_ISC_2, + IRQ_PEND_IO_ISC_1, + IRQ_PEND_IO_ISC_0, + IRQ_PEND_VIRTIO, + IRQ_PEND_PFAULT_DONE, + IRQ_PEND_PFAULT_INIT, + IRQ_PEND_EXT_HOST, + IRQ_PEND_EXT_SERVICE, + IRQ_PEND_EXT_TIMING, + IRQ_PEND_EXT_CPU_TIMER, + IRQ_PEND_EXT_CLOCK_COMP, + IRQ_PEND_EXT_EXTERNAL, + IRQ_PEND_EXT_EMERGENCY, + IRQ_PEND_EXT_MALFUNC, + IRQ_PEND_EXT_IRQ_KEY, + IRQ_PEND_MCHK_REP, + IRQ_PEND_PROG, + IRQ_PEND_SVC, + IRQ_PEND_MCHK_EX, IRQ_PEND_COUNT }; -- cgit