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krun: set the vRAM size for the microVM #69

Merged
merged 2 commits into from
Oct 1, 2024
Merged

krun: set the vRAM size for the microVM #69

merged 2 commits into from
Oct 1, 2024

Commits on Oct 1, 2024

  1. krun: set the vRAM size for the microVM 

    Starting v1.9.5, libkrun allows configuring the size of the SHM window
for virtio-gpu, which acts as a pseudo-vram (previously it was hardcoded
to a conservative 8GB).

Let's use that feature to configure the vRAM of the microVM to a
reasonable value. Since we expect userspace drivers in the guest to be
conservative for us, telling appliations that vRAM is just a percentage
of the guest's RAM, let's just set vRAM to be the same as the total
amount of RAM in the system, leaving some room for potential
fragmentation.

Also, introduce the "--vram" command flag to allow users to override the
default value.

While there, also remove the 32 GB limit, since libkrun does support
guests larger than that.

Signed-off-by: Sergio Lopez <[email protected]>
    @slp
    slp committed Oct 1, 2024
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  2. Ensure we leave at least 3072MiB free to the host 

    Leaving less than 3072MiB for the host can compromise the system's
stability, so ensure we do that unless instructed by the user. This
mainly applies to 8GB systems.

Signed-off-by: Sergio Lopez <[email protected]>
    @slp
    slp committed Oct 1, 2024
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