[PATCH 1/2] linux-headers: Add support for reads in ioeventfd

[Amey Narkhede]

This patch introduces a new flag KVM_IOEVENTFD_FLAG_DATAREAD
in ioeventfd to enable receiving a notification when a
guest reads from registered PIO/MMIO address.

Signed-off-by: Amey Narkhede <ameynarkhede03@gmail.com>
---
 linux-headers/linux/kvm.h | 5 ++++-
 1 file changed, 4 insertions(+), 1 deletion(-)

diff --git a/linux-headers/linux/kvm.h b/linux-headers/linux/kvm.h
index 43580c767c..3e71d15a53 100644
--- a/linux-headers/linux/kvm.h
+++ b/linux-headers/linux/kvm.h
@@ -695,6 +695,7 @@ struct kvm_guest_debug {
 
 enum {
        kvm_ioeventfd_flag_nr_datamatch,
+       kvm_ioeventfd_flag_nr_dataread,
        kvm_ioeventfd_flag_nr_pio,
        kvm_ioeventfd_flag_nr_deassign,
        kvm_ioeventfd_flag_nr_virtio_ccw_notify,
@@ -703,6 +704,7 @@ enum {
 };
 
 #define KVM_IOEVENTFD_FLAG_DATAMATCH (1 << kvm_ioeventfd_flag_nr_datamatch)
+#define KVM_IOEVENTFD_FLAG_DATAREAD (1 << kvm_ioeventfd_flag_nr_dataread)
 #define KVM_IOEVENTFD_FLAG_PIO       (1 << kvm_ioeventfd_flag_nr_pio)
 #define KVM_IOEVENTFD_FLAG_DEASSIGN  (1 << kvm_ioeventfd_flag_nr_deassign)
 #define KVM_IOEVENTFD_FLAG_VIRTIO_CCW_NOTIFY \
@@ -712,11 +714,12 @@ enum {
 
 struct kvm_ioeventfd {
        __u64 datamatch;
+       __u64 dataread;
        __u64 addr;        /* legal pio/mmio address */
        __u32 len;         /* 1, 2, 4, or 8 bytes; or 0 to ignore length */
        __s32 fd;
        __u32 flags;
-       __u8  pad[36];
+       __u8  pad[28];
 };
 
 #define KVM_X86_DISABLE_EXITS_MWAIT          (1 << 0)
-- 
2.28.0