linux-kernel - Re: [PATCH v3 08/11] KVM: X86: Introduce KVM_HC_PAGE_ENC

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Date:   Mon, 25 Nov 2019 11:07:23 -0800
From:   Peter Gonda <pgonda@...gle.com>
To:     "Singh, Brijesh" <brijesh.singh@....com>
Cc:     "kvm@...r.kernel.org" <kvm@...r.kernel.org>,
        Thomas Gleixner <tglx@...utronix.de>,
        Ingo Molnar <mingo@...hat.com>,
        "H. Peter Anvin" <hpa@...or.com>,
        Paolo Bonzini <pbonzini@...hat.com>,
        Radim Krčmář <rkrcmar@...hat.com>,
        Joerg Roedel <joro@...tes.org>, Borislav Petkov <bp@...e.de>,
        "Lendacky, Thomas" <Thomas.Lendacky@....com>,
        "x86@...nel.org" <x86@...nel.org>,
        "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>
Subject: Re: [PATCH v3 08/11] KVM: X86: Introduce KVM_HC_PAGE_ENC_STATUS hypercall

>  struct kvm_arch_async_pf {
> diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
> index 3089942f6630..431718309359 100644
> --- a/arch/x86/kvm/svm.c
> +++ b/arch/x86/kvm/svm.c
> @@ -135,6 +135,8 @@ struct kvm_sev_info {
>         int fd;                 /* SEV device fd */
>         unsigned long pages_locked; /* Number of pages locked */
>         struct list_head regions_list;  /* List of registered regions */
> +       unsigned long *page_enc_bmap;
> +       unsigned long page_enc_bmap_size;
>  };
>

Just a high level question. Would it be better for these bitmaps to
live in kvm_memory_slot and the ioctl to be take a memslot instead of
a GPA + length? The c-bit status bitmap will probably need to be
checked at when checking the dirty log and KVM_GET_DIRTY_LOG
operations on memslots.