Masatake YAMATO e46b469278 kvm: embed vcpu id to dentry of vcpu anon inode ... All d-entries for vcpu have the same, "anon_inode:kvm-vcpu". That means it is impossible to know the mapping between fds for vcpu and vcpu from userland. # LC_ALL=C ls -l /proc/617/fd | grep vcpu lrwx------. 1 qemu qemu 64 Jan 7 16:50 18 -> anon_inode:kvm-vcpu lrwx------. 1 qemu qemu 64 Jan 7 16:50 19 -> anon_inode:kvm-vcpu It is also impossible to know the mapping between vma for kvm_run structure and vcpu from userland. # LC_ALL=C grep vcpu /proc/617/maps 7f9d842d0000-7f9d842d3000 rw-s 00000000 00:0d 20393 anon_inode:kvm-vcpu 7f9d842d3000-7f9d842d6000 rw-s 00000000 00:0d 20393 anon_inode:kvm-vcpu This change adds vcpu id to d-entries for vcpu. With this change you can get the following output: # LC_ALL=C ls -l /proc/617/fd | grep vcpu lrwx------. 1 qemu qemu 64 Jan 7 16:50 18 -> anon_inode:kvm-vcpu:0 lrwx------. 1 qemu qemu 64 Jan 7 16:50 19 -> anon_inode:kvm-vcpu:1 # LC_ALL=C grep vcpu /proc/617/maps 7f9d842d0000-7f9d842d3000 rw-s 00000000 00:0d 20393 anon_inode:kvm-vcpu:0 7f9d842d3000-7f9d842d6000 rw-s 00000000 00:0d 20393 anon_inode:kvm-vcpu:1 With the mappings known from the output, a tool like strace can report more details of qemu-kvm process activities. Here is the strace output of my local prototype: # ./strace -KK -f -p 617 2>&1 | grep 'KVM_RUN\| K' ... [pid 664] ioctl(18, KVM_RUN, 0) = 0 (KVM_EXIT_MMIO) K ready_for_interrupt_injection=1, if_flag=0, flags=0, cr8=0000000000000000, apic_base=0x000000fee00d00 K phys_addr=0, len=1634035803, [33, 0, 0, 0, 0, 0, 0, 0], is_write=112 [pid 664] ioctl(18, KVM_RUN, 0) = 0 (KVM_EXIT_MMIO) K ready_for_interrupt_injection=1, if_flag=1, flags=0, cr8=0000000000000000, apic_base=0x000000fee00d00 K phys_addr=0, len=1634035803, [33, 0, 0, 0, 0, 0, 0, 0], is_write=112 ... Signed-off-by: Masatake YAMATO <yamato@redhat.com> Acked-by: Christian Borntraeger <borntraeger@de.ibm.com> Signed-off-by: Radim Krčmář <rkrcmar@redhat.com>		2018-01-31 18:25:34 +01:00
..
kvm	kvm: embed vcpu id to dentry of vcpu anon inode	2018-01-31 18:25:34 +01:00
lib	KVM: eventfd: fix NULL deref irqbypass consumer	2017-01-12 14:42:34 +01:00
Makefile