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authorJing Zhang <jingzhangos@google.com>2021-06-18 22:27:05 +0000
committerPaolo Bonzini <pbonzini@redhat.com>2021-06-24 18:00:10 -0400
commitfcfe1baeddbf1c7c448b44c82586d0cbc8abc9f5 (patch)
tree1d7b6b70c649bbfbb2ada937a4dcec2b8558625c /arch/arm64/kvm/guest.c
parentcb082bfab59a224a49ae803fed52cd03e8d6b5e0 (diff)
KVM: stats: Support binary stats retrieval for a VM
Add a VM ioctl to get a statistics file descriptor by which a read functionality is provided for userspace to read out VM stats header, descriptors and data. Define VM statistics descriptors and header for all architectures. Reviewed-by: David Matlack <dmatlack@google.com> Reviewed-by: Ricardo Koller <ricarkol@google.com> Reviewed-by: Krish Sadhukhan <krish.sadhukhan@oracle.com> Reviewed-by: Fuad Tabba <tabba@google.com> Tested-by: Fuad Tabba <tabba@google.com> #arm64 Signed-off-by: Jing Zhang <jingzhangos@google.com> Message-Id: <20210618222709.1858088-4-jingzhangos@google.com> Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'arch/arm64/kvm/guest.c')
-rw-r--r--arch/arm64/kvm/guest.c15
1 files changed, 15 insertions, 0 deletions
diff --git a/arch/arm64/kvm/guest.c b/arch/arm64/kvm/guest.c
index 988ead309cbe..d7606a3c449b 100644
--- a/arch/arm64/kvm/guest.c
+++ b/arch/arm64/kvm/guest.c
@@ -28,6 +28,21 @@
#include "trace.h"
+const struct _kvm_stats_desc kvm_vm_stats_desc[] = {
+ KVM_GENERIC_VM_STATS()
+};
+static_assert(ARRAY_SIZE(kvm_vm_stats_desc) ==
+ sizeof(struct kvm_vm_stat) / sizeof(u64));
+
+const struct kvm_stats_header kvm_vm_stats_header = {
+ .name_size = KVM_STATS_NAME_SIZE,
+ .num_desc = ARRAY_SIZE(kvm_vm_stats_desc),
+ .id_offset = sizeof(struct kvm_stats_header),
+ .desc_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE,
+ .data_offset = sizeof(struct kvm_stats_header) + KVM_STATS_NAME_SIZE +
+ sizeof(kvm_vm_stats_desc),
+};
+
struct kvm_stats_debugfs_item debugfs_entries[] = {
VCPU_STAT("halt_successful_poll", generic.halt_successful_poll),
VCPU_STAT("halt_attempted_poll", generic.halt_attempted_poll),