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[RFC] Support PVH boot protocol #1818

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[RFC] Support PVH boot protocol #1818

wants to merge 7 commits into from

Commits on Apr 23, 2020

  1. pvh/kernel: Add ELF Note definitions 

    Define ELF Note header structure and constants necessary for parsing
the PVH entry point address encoded in kernel ELF header.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  2. pvh/arch_gen: Introduce hvm_start_info structure 

    Introduce the layout and define the start_info, module
list and memory map table entry structures used by the
PVH boot protocol.

The hvm_start_info structure is akin to bootparams in
Linux boot protocol, specifying the small set of
parameters required by the PVH protocol.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  3. pvh/kernel: Read PVH entry point address from kernel binary 

    Parse the ELF header looking for a PVH Note section and retrieve
the encoded PVH entry point address if there is one. This PVH entry
point address is returned alongside the typical ELF entry point used
for direct boot. The vmm crate can now determine whether a
PVH entry point is available and choose to configure its guests
to boot using either PVH or Linux 64-bit protocol.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  4. pvh/arch: Introduce EntryPoint struct 

    In order to properly configure the initial vCPU register state
and boot parameters in guest memory, we must specify which
boot protocol to use with the kernel entry point address.

Create an EntryPoint struct that contains the required
information. This structure will later be used in the vCPU
configuration methods to set the appropriate initial
conditions for the guest.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  5. pvh/arch-x86_64: Initialize vCPU regs/sregs for PVH boot 

    Set the initial values of the KVM vCPU registers as specified in
the PVH boot ABI:

https://xenbits.xen.org/docs/unstable/misc/pvh.html

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  6. pvh/arch-x86_64: Write start_info structure to guest memory 

    Fill the hvm_start_info and related structures as specified
in the PVH boot protocol. Write the data structures to guest
memory at the GPA that will be stored in %rbx when the guest starts.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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  7. pvh: Control PVH capabilities using optional feature 

    Enable the optional "pvh" feature to build a Firecracker binary
that is able to boot Linux guests using the PVH boot protocol.
Build a firecracker binary with the PVH capability by running:

tools/devtool build [--release] -- --features pvh

and the resulting Firecracker binary will use the PVH boot
protocol as the preferred choice for booting a guest, if the
guest kernel supports it.

Signed-off-by: Alejandro Jimenez <alejandro.j.jimenez@oracle.com>
Acked-by: Liam Merwick <liam.merwick@oracle.com>
    @aljimenezb
    aljimenezb committed Apr 23, 2020
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