Commit b2312f05 authored Apr 16, 2008 by Hollis Blanchard Committed by Avi Kivity Apr 27, 2008

KVM: ppc: Add DCR access information to struct kvm_run

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>

parent 4baacfb0

include/linux/kvm.h

+7 −0

Original line number	Diff line number	Diff line
		@@ -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];
		};

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