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Rob Bradford 06eb82d239 build: Consolidate "gdb" build feature into "guest_debug"

This simplifies the CI process but also logical with the existing
functionality under "guest_debug" (dumping guest memory).

Fixes: #4679

Signed-off-by: Rob Bradford <robert.bradford@intel.com>

2022-09-27 14:30:57 +01:00

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GDB Support

This feature allows remote guest debugging using GDB. Note that this feature is only supported on x86_64/KVM.

To enable debugging with GDB, build with the guest_debug feature enabled:

cargo build --features guest_debug

To use the --gdb option, specify the Unix Domain Socket with --path that Cloud Hypervisor will use to communicate with the host's GDB:

./cloud-hypervisor \
    --kernel hypervisor-fw \
    --disk path=bionic-server-cloudimg-amd64.raw \
    --cpus boot=1 \
    --memory size=1024M \
    --net "tap=,mac=,ip=,mask=" \
    --console off \
    --serial tty \
    --gdb path=/tmp/ch-gdb-sock

Cloud Hypervisor will listen for GDB on the host side before starting the guest. On the host side, connect to the GDB remote server as follows:

gdb -q
(gdb) target remote /tmp/ch-gdb-sock
Remote debugging using /tmp/ch-gdb-sock
warning: No executable has been specified, and target does not support
determining executable automatically. Try using the "file" command.
0x000000000011217e in ?? ()

You can set up to four hardware breakpoints using the x86 debug register:

(gdb) hb *0x1121b7
Hardware assisted breakpoint 1 at 0x1121b7
(gdb) c
Continuing.

Breakpoint 1, 0x00000000001121b7 in ?? ()
(gdb)

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GDB Support

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