lkml.org 
[lkml]   [2008]   [Apr]   [21]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
Patch in this message
/
From
Subject[PATCH 21/31] KVM: ppc: Add DCR access information to struct kvm_run
Date
From: Hollis Blanchard <hollisb@us.ibm.com>

Device Control Registers are essentially another address space found on PowerPC
4xx processors, analogous to PIO on x86. DCRs are always 32 bits, and can be
identified by a 32-bit number. We forward most DCR accesses to userspace for
emulation (with the exception of CPR0 registers, which can be read directly
for simplicity in timebase frequency determination).

Signed-off-by: Hollis Blanchard <hollisb@us.ibm.com>
Signed-off-by: Avi Kivity <avi@qumranet.com>
---
include/linux/kvm.h | 7 +++++++
1 files changed, 7 insertions(+), 0 deletions(-)
diff --git a/include/linux/kvm.h b/include/linux/kvm.h
index f8e211d..a281afe 100644
--- a/include/linux/kvm.h
+++ b/include/linux/kvm.h
@@ -82,6 +82,7 @@ struct kvm_irqchip {
#define KVM_EXIT_TPR_ACCESS 12
#define KVM_EXIT_S390_SIEIC 13
#define KVM_EXIT_S390_RESET 14
+#define KVM_EXIT_DCR 15

/* for KVM_RUN, returned by mmap(vcpu_fd, offset=0) */
struct kvm_run {
@@ -161,6 +162,12 @@ struct kvm_run {
#define KVM_S390_RESET_CPU_INIT 8
#define KVM_S390_RESET_IPL 16
__u64 s390_reset_flags;
+ /* KVM_EXIT_DCR */
+ struct {
+ __u32 dcrn;
+ __u32 data;
+ __u8 is_write;
+ } dcr;
/* Fix the size of the union. */
char padding[256];
};
--
1.5.5


\
 
 \ /
  Last update: 2008-04-21 12:39    [W:0.168 / U:1.128 seconds]
©2003-2014 Jasper Spaans. Advertise on this site