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:0.021 / U:0.476 seconds]
    ©2003-2016 Jasper Spaans. hosted at Digital OceanAdvertise on this site