linux-kernel - Re: [PATCH v8 28/39] KVM: selftests: Fill in vm->vpages_mapped bitmap in virt

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Message-ID: <YtnF0haNc3MDYw+g@google.com>
Date:   Thu, 21 Jul 2022 21:32:02 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Vitaly Kuznetsov <vkuznets@...hat.com>
Cc:     kvm@...r.kernel.org, Paolo Bonzini <pbonzini@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Michael Kelley <mikelley@...rosoft.com>,
        Siddharth Chandrasekaran <sidcha@...zon.de>,
        Yuan Yao <yuan.yao@...ux.intel.com>,
        Maxim Levitsky <mlevitsk@...hat.com>,
        linux-hyperv@...r.kernel.org, linux-kernel@...r.kernel.org
Subject: Re: [PATCH v8 28/39] KVM: selftests: Fill in vm->vpages_mapped
 bitmap in virt_map() too

On Thu, Jul 14, 2022, Vitaly Kuznetsov wrote:
> Similar to vm_vaddr_alloc(), virt_map() needs to reflect the mapping
> in vm->vpages_mapped.
> 
> Signed-off-by: Vitaly Kuznetsov <vkuznets@...hat.com>
> ---
>  tools/testing/selftests/kvm/lib/kvm_util.c | 3 +++
>  1 file changed, 3 insertions(+)
> 
> diff --git a/tools/testing/selftests/kvm/lib/kvm_util.c b/tools/testing/selftests/kvm/lib/kvm_util.c
> index 768f3bce0161..63f411f7da1e 100644
> --- a/tools/testing/selftests/kvm/lib/kvm_util.c
> +++ b/tools/testing/selftests/kvm/lib/kvm_util.c
> @@ -1275,6 +1275,9 @@ void virt_map(struct kvm_vm *vm, uint64_t vaddr, uint64_t paddr,
>  		virt_pg_map(vm, vaddr, paddr);
>  		vaddr += page_size;
>  		paddr += page_size;
> +
> +		sparsebit_set(vm->vpages_mapped,
> +			vaddr >> vm->page_shift);

No need to wrap.  Can you also fix vm_vaddr_alloc(), which I assume is the source
of the copy+paste?