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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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18
arch/riscv/kvm/vcpu.c
View File

@@ -682,7 +682,14 @@ void kvm_arch_vcpu_put(struct kvm_vcpu *vcpu)
}
}
static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
/**
* check_vcpu_requests - check and handle pending vCPU requests
* @vcpu: the VCPU pointer
*
* Return: 1 if we should enter the guest
* 0 if we should exit to userspace
*/
static int kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
{
struct rcuwait *wait = kvm_arch_vcpu_get_wait(vcpu);
@@ -723,7 +730,12 @@ static void kvm_riscv_check_vcpu_requests(struct kvm_vcpu *vcpu)
if (kvm_check_request(KVM_REQ_STEAL_UPDATE, vcpu))
kvm_riscv_vcpu_record_steal_time(vcpu);
if (kvm_dirty_ring_check_request(vcpu))
return 0;
}
return 1;
}
static void kvm_riscv_update_hvip(struct kvm_vcpu *vcpu)
@@ -905,7 +917,9 @@ int kvm_arch_vcpu_ioctl_run(struct kvm_vcpu *vcpu)
kvm_riscv_gstage_vmid_update(vcpu);
kvm_riscv_check_vcpu_requests(vcpu);
ret = kvm_riscv_check_vcpu_requests(vcpu);
if (ret <= 0)
continue;
preempt_disable();