[PATCH v3 0/2] riscv: KVM: Expose Zicbom to the guest

[Andrew Jones]

Add support for exposing the Zicbom extension to guests. This has been
tested over a QEMU including the Zicbom support [1] ([1] was rebased and
the Zicboz support from it was dropped.) QEMU was further modified to
ensure the cache block size was provided in the DT. kvmtool was also
modified [2] to test the new KVM API and provide the guest the cache
block size in its DT (The kvmtool patches are based on Anup's Svpbmt/Sstc
series [3]). These KVM patches are based on the riscv_init_cbom_blocksize()
cleanup patch from Palmer and the move and expose riscv_cbom_block_size
patch from Anup which was reposted [4]. This series is also available here
[5].

[1] https://gitlab.com/jones-drew/qemu/-/commits/riscv/zicbom
[2] https://github.com/jones-drew/kvmtool/commits/riscv/zicbom
[3] https://github.com/avpatel/kvmtool/commits/riscv_svpbmt_sstc_v1
[4] https://lore.kernel.org/linux-riscv/20220906074509.928865-1-ajones@ventanamicro.com/T/#u
[5] https://github.com/jones-drew/linux/commits/riscv/kvm/zicbom-v3

Thanks,
drew

v3:
 - Added check to ensure the extension is enabled for
   config.get(blocksz) [Atish and Anup]
 - Opportunistically switched all extension checks in
   kvm_riscv_vcpu_update_config() to riscv_isa_extension_available()
   from its __ counterpart
 - Picked up some r-b's

v2:
 - Dropped a patch that output the cache block size to dmesg

Andrew Jones (2):
  RISC-V: KVM: Provide UAPI for Zicbom block size
  RISC-V: KVM: Expose Zicbom to the guest

 arch/riscv/include/uapi/asm/kvm.h |  2 ++
 arch/riscv/kvm/vcpu.c             | 17 +++++++++++++++--
 arch/riscv/mm/cacheflush.c        |  1 +
 3 files changed, 18 insertions(+), 2 deletions(-)

-- 
2.37.2