03a0331c8c
Signed-off-by: Sanjay Lal <sanjayl@kymasys.com> Cc: kvm@vger.kernel.org Cc: linux-mips@linux-mips.org Signed-off-by: Ralf Baechle <ralf@linux-mips.org>
31 lines
1.4 KiB
Text
31 lines
1.4 KiB
Text
KVM/MIPS Trap & Emulate Release Notes
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(1) KVM/MIPS should support MIPS32R2 and beyond. It has been tested on the following platforms:
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Malta Board with FPGA based 34K
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Sigma Designs TangoX board with a 24K based 8654 SoC.
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Malta Board with 74K @ 1GHz
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(2) Both Guest kernel and Guest Userspace execute in UM.
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Guest User address space: 0x00000000 -> 0x40000000
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Guest Kernel Unmapped: 0x40000000 -> 0x60000000
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Guest Kernel Mapped: 0x60000000 -> 0x80000000
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Guest Usermode virtual memory is limited to 1GB.
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(2) 16K Page Sizes: Both Host Kernel and Guest Kernel should have the same page size, currently at least 16K.
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Note that due to cache aliasing issues, 4K page sizes are NOT supported.
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(3) No HugeTLB Support
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Both the host kernel and Guest kernel should have the page size set to 16K.
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This will be implemented in a future release.
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(4) KVM/MIPS does not have support for SMP Guests
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Linux-3.7-rc2 based SMP guest hangs due to the following code sequence in the generated TLB handlers:
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LL/TLBP/SC. Since the TLBP instruction causes a trap the reservation gets cleared
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when we ERET back to the guest. This causes the guest to hang in an infinite loop.
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This will be fixed in a future release.
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(5) Use Host FPU
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Currently KVM/MIPS emulates a 24K CPU without a FPU.
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This will be fixed in a future release
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