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RISC-V: KVM: Enable ring-based dirty memory tracking

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Enable ring-based dirty memory tracking on riscv:

- Enable CONFIG_HAVE_KVM_DIRTY_RING_ACQ_REL as riscv is weakly
  ordered.
- Set KVM_DIRTY_LOG_PAGE_OFFSET for the ring buffer's physical page
  offset.
- Add a check to kvm_vcpu_kvm_riscv_check_vcpu_requests for checking
  whether the dirty ring is soft full.

To handle vCPU requests that cause exits to userspace, modified the
`kvm_riscv_check_vcpu_requests` to return a value (currently only
returns 0 or 1).

Signed-off-by: Quan Zhou <zhouquan@iscas.ac.cn>
Reviewed-by: Anup Patel <anup@brainfault.org>
Link: https://lore.kernel.org/r/20e116efb1f7aff211dd8e3cf8990c5521ed5f34.1749810735.git.zhouquan@iscas.ac.cn
Signed-off-by: Anup Patel <anup@brainfault.org>
This commit is contained in:
Quan Zhou
2025-06-13 19:29:57 +08:00
committed by Anup Patel
parent 7826c8f372
commit f55ffaf896
4 changed files with 19 additions and 3 deletions
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2
Documentation/virt/kvm/api.rst
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@@ -8373,7 +8373,7 @@ core crystal clock frequency, if a non-zero CPUID 0x15 is exposed to the guest.
7.36 KVM_CAP_DIRTY_LOG_RING/KVM_CAP_DIRTY_LOG_RING_ACQ_REL
----------------------------------------------------------
:Architectures: x86, arm64
:Architectures: x86, arm64, riscv
:Type: vm
:Parameters: args[0] - size of the dirty log ring