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| author | Liran Alon | 2020-03-12 17:54:19 +0100 |
|---|---|---|
| committer | Paolo Bonzini | 2020-06-10 18:09:44 +0200 |
| commit | 0342ee761ef27a0def476dab3e284f924b3c801e (patch) | |
| tree | 3c72df6987377ef170bf9e28c764162188e710d3 /include | |
| parent | hw/i386/vmport: Propagate IOPort read to vCPU EAX register (diff) | |
| download | qemu-0342ee761ef27a0def476dab3e284f924b3c801e.tar.gz qemu-0342ee761ef27a0def476dab3e284f924b3c801e.tar.xz qemu-0342ee761ef27a0def476dab3e284f924b3c801e.zip | |
hw/i386/vmport: Set EAX to -1 on failed and unsupported commands
This is used as a signal for VMware Tools to know if a command it
attempted to invoke, failed or is unsupported. As a result, VMware Tools
will either report failure to user or fallback to another backdoor command
in attempt to perform some operation.
A few examples:
* open-vm-tools TimeSyncReadHost() function fallbacks to
CMD_GETTIMEFULL command when CMD_GETTIMEFULL_WITH_LAG
fails/unsupported.
* open-vm-tools Hostinfo_NestingSupported() function verifies
EAX != -1 to check for success.
* open-vm-tools Hostinfo_VCPUInfoBackdoor() functions checks
if reserved-bit is set to indicate command is unimplemented.
Reviewed-by: Nikita Leshenko <nikita.leshchenko@oracle.com>
Signed-off-by: Liran Alon <liran.alon@oracle.com>
Message-Id: <20200312165431.82118-5-liran.alon@oracle.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Diffstat (limited to 'include')
0 files changed, 0 insertions, 0 deletions