[libvirt][PATCH RESEND v10 5/5] qemu: Add command-line to generate SGX EPC memory backend

[Daniel P. Berrangé]

On Wed, Feb 16, 2022 at 11:25:40AM +0100, Michal Prívozník wrote:
> On 2/8/22 06:21, Haibin Huang wrote:
> > From: Lin Yang <lin.a.yang at intel.com>
> > 
> > According to the result parsing from xml, add the argument of
> > SGX EPC memory backend into QEMU command line:
> > 
> >     #qemu-system-x86_64 \
> >         ...... \
> >         -object memory-backend-epc,id=mem1,size=64M,prealloc=on \
> >         -object memory-backend-epc,id=mem2,size=28M \
> >         -M sgx-epc.0.memdev=mem1,sgx-epc.1.memdev=mem2
> > 
> > Signed-off-by: Lin Yang <lin.a.yang at intel.com>
> > ---
> >  src/qemu/qemu_alias.c                         |  3 +-
> >  src/qemu/qemu_command.c                       | 46 +++++++++++++++++--
> >  .../sgx-epc.x86_64-6.2.0.args                 | 38 +++++++++++++++
> >  tests/qemuxml2argvtest.c                      |  2 +
> >  4 files changed, 84 insertions(+), 5 deletions(-)
> >  create mode 100644 tests/qemuxml2argvdata/sgx-epc.x86_64-6.2.0.args
> > 

> > diff --git a/tests/qemuxml2argvdata/sgx-epc.x86_64-6.2.0.args b/tests/qemuxml2argvdata/sgx-epc.x86_64-6.2.0.args
> > new file mode 100644
> > index 0000000000..e1aa274054
> > --- /dev/null
> > +++ b/tests/qemuxml2argvdata/sgx-epc.x86_64-6.2.0.args
> > @@ -0,0 +1,38 @@
> > +LC_ALL=C \
> > +PATH=/bin \
> > +HOME=/tmp/lib/domain--1-QEMUGuest1 \
> > +USER=test \
> > +LOGNAME=test \
> > +XDG_DATA_HOME=/tmp/lib/domain--1-QEMUGuest1/.local/share \
> > +XDG_CACHE_HOME=/tmp/lib/domain--1-QEMUGuest1/.cache \
> > +XDG_CONFIG_HOME=/tmp/lib/domain--1-QEMUGuest1/.config \
> > +/usr/bin/qemu-system-x86_64 \
> > +-name guest=QEMUGuest1,debug-threads=on \
> > +-S \
> > +-object '{"qom-type":"secret","id":"masterKey0","format":"raw","file":"/tmp/lib/domain--1-QEMUGuest1/master-key.aes"}' \
> > +-machine pc-q35-6.2,usb=off,dump-guest-core=off,memory-backend=pc.ram \
> > +-accel tcg \
> > +-cpu qemu64 \
> > +-m 134 \
> > +-object '{"qom-type":"memory-backend-ram","id":"pc.ram","size":140509184}' \
> > +-overcommit mem-lock=off \
> > +-smp 1,sockets=1,cores=1,threads=1 \
> > +-object '{"qom-type":"memory-backend-epc","id":"memepc0","prealloc":true,"size":67108864}' \
> > +-object '{"qom-type":"memory-backend-epc","id":"memepc1","prealloc":true,"size":16777216}' \
> > +-M sgx-epc.0.memdev=memepc0,sgx-epc.1.memdev=memepc1 \
> 
> I don't think this is correct. IIUC, this can be passed to -machine
> directly, e.g.:
> 
> -machine
> pc-q35-6.2,usb=off,dump-guest-core=off,memory-backend=pc.ram,sgx-epc.0.memdev=memepc0,sgx-epc.1.memdev=memepc1
> 
> And when I try to do that, I get:
> 
>   qemu-system-x86_64: Parameter 'sgx-epc.0.node' is missing
> 
> Any idea, what's going on? I would much rather avoid using -M if we can
> help it.

-M is just the short alias for --machine arg. We must definitely be
adding the neccessary args to the *existing* --machine arg, not adding
a second copy of it.


Regards,
Daniel
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