Commit | Line | Data |
---|---|---|
03a0331c SL |
1 | KVM/MIPS Trap & Emulate Release Notes |
2 | ===================================== | |
3 | ||
4 | (1) KVM/MIPS should support MIPS32R2 and beyond. It has been tested on the following platforms: | |
5 | Malta Board with FPGA based 34K | |
6 | Sigma Designs TangoX board with a 24K based 8654 SoC. | |
7 | Malta Board with 74K @ 1GHz | |
8 | ||
9 | (2) Both Guest kernel and Guest Userspace execute in UM. | |
10 | Guest User address space: 0x00000000 -> 0x40000000 | |
11 | Guest Kernel Unmapped: 0x40000000 -> 0x60000000 | |
12 | Guest Kernel Mapped: 0x60000000 -> 0x80000000 | |
13 | ||
14 | Guest Usermode virtual memory is limited to 1GB. | |
15 | ||
16 | (2) 16K Page Sizes: Both Host Kernel and Guest Kernel should have the same page size, currently at least 16K. | |
17 | Note that due to cache aliasing issues, 4K page sizes are NOT supported. | |
18 | ||
19 | (3) No HugeTLB Support | |
20 | Both the host kernel and Guest kernel should have the page size set to 16K. | |
21 | This will be implemented in a future release. | |
22 | ||
23 | (4) KVM/MIPS does not have support for SMP Guests | |
24 | Linux-3.7-rc2 based SMP guest hangs due to the following code sequence in the generated TLB handlers: | |
25 | LL/TLBP/SC. Since the TLBP instruction causes a trap the reservation gets cleared | |
26 | when we ERET back to the guest. This causes the guest to hang in an infinite loop. | |
27 | This will be fixed in a future release. | |
28 | ||
29 | (5) Use Host FPU | |
30 | Currently KVM/MIPS emulates a 24K CPU without a FPU. | |
31 | This will be fixed in a future release |