On 10/31/2012 05:17 PM, Sanjay Lal wrote:
> The following patchset implements KVM support for MIPS32R2 processors,
> using Trap & Emulate, with basic runtime binary translation to improve
> performance. The goal has been to keep the Guest kernel changes to a
> The patch is against Linux 3.7-rc2.
> There is a companion patchset for QEMU that adds KVM support for the
> MIPS target.
> KVM/MIPS should support MIPS32-R2 processors and beyond.
> It has been tested on the following platforms:
> - Malta Board with FPGA based 34K (Little Endian).
> - Sigma Designs TangoX board with a 24K based 8654 SoC (Little Endian).
> - Malta Board with 74K @ 1GHz (Little Endian).
> - OVPSim MIPS simulator from Imperas emulating a Malta board with
> 24Kc and 1074Kc cores (Little Endian).
> Both Guest kernel and Guest Userspace execute in UM. The Guest address space
> as folows:
> Guest User address space: 0x00000000 -> 0x40000000
> Guest Kernel Unmapped: 0x40000000 -> 0x60000000
> Guest Kernel Mapped: 0x60000000 -> 0x80000000
> As a result, Guest Usermode virtual memory is limited to 1GB.
> Relase Notes
> (1) 16K Page Size:
> Both Host Kernel and Guest Kernel should have the same page size,
> currently at least 16K. Note that due to cache aliasing issues,
> 4K page sizes are NOT supported.
> (2) No HugeTLB/Large Page Support:
> Both the host kernel and Guest kernel should have the page size
> set to at least 16K.
> This will be implemented in a future release.
> (3) SMP Guests to not work
> Linux-3.7-rc2 based SMP guest hangs due to the following code sequence
> in the generated TLB handlers:
> Since the TLBP instruction causes a trap the reservation gets cleared
> when we ERET back to the guest. This causes the guest to hang in an
> infinite loop.
> As a workaround, make sure that CONFIG_SMP is disabled for Guest kernels.
> This will be fixed in a future release.
> (4) FPU support:
> Currently KVM/MIPS emulates a 24K CPU without a FPU.
> This will be fixed in a future release
Thanks for posting this, new architectures are always a welcome addition.
Some general notes:
- please read and follow Documentation/CodingStyle. In general the
patches are okay except for indentation (use tabs, not spaces, and set
your editor tab width to 8).
- please use 'git send-email' to send the entire patchset, this keeps
all the patches in a single thread which is easier to follow.
- please add a general architecture document to Documentation/virtual/kvm
- Update Documentation/virtual/kvm/api.txt as needed.
What is the intended use case?
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