linux-kernel - Re: [PATCH v2 6/7] KVM: Drop KVM_REQ_MMU_RELOAD and update vcpu-requests.rst documentation

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Date:   Mon, 28 Feb 2022 14:22:10 -0800
From:   Ben Gardon <bgardon@...gle.com>
To:     Sean Christopherson <seanjc@...gle.com>
Cc:     Paolo Bonzini <pbonzini@...hat.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>,
        David Hildenbrand <david@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm <kvm@...r.kernel.org>,
        LKML <linux-kernel@...r.kernel.org>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: Re: [PATCH v2 6/7] KVM: Drop KVM_REQ_MMU_RELOAD and update
 vcpu-requests.rst documentation

On Fri, Feb 25, 2022 at 10:23 AM Sean Christopherson <seanjc@...gle.com> wrote:
>
> Remove the now unused KVM_REQ_MMU_RELOAD, shift KVM_REQ_VM_DEAD into the
> unoccupied space, and update vcpu-requests.rst, which was missing an
> entry for KVM_REQ_VM_DEAD.  Switching KVM_REQ_VM_DEAD to entry '1' also
> fixes the stale comment about bits 4-7 being reserved.
>
> Reviewed-by: Claudio Imbrenda <imbrenda@...ux.ibm.com>

Reviewed-by: Ben Gardon <bgardon@...gle.com>

> Signed-off-by: Sean Christopherson <seanjc@...gle.com>
> ---
>  Documentation/virt/kvm/vcpu-requests.rst | 7 +++----
>  include/linux/kvm_host.h                 | 3 +--
>  2 files changed, 4 insertions(+), 6 deletions(-)
>
> diff --git a/Documentation/virt/kvm/vcpu-requests.rst b/Documentation/virt/kvm/vcpu-requests.rst
> index ad2915ef7020..b61d48aec36c 100644
> --- a/Documentation/virt/kvm/vcpu-requests.rst
> +++ b/Documentation/virt/kvm/vcpu-requests.rst
> @@ -112,11 +112,10 @@ KVM_REQ_TLB_FLUSH
>    choose to use the common kvm_flush_remote_tlbs() implementation will
>    need to handle this VCPU request.
>
> -KVM_REQ_MMU_RELOAD
> +KVM_REQ_VM_DEAD
>
> -  When shadow page tables are used and memory slots are removed it's
> -  necessary to inform each VCPU to completely refresh the tables.  This
> -  request is used for that.
> +  This request informs all VCPUs that the VM is dead and unusable, e.g. due to
> +  fatal error or because the VM's state has been intentionally destroyed.
>
>  KVM_REQ_UNBLOCK
>
> diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
> index 0aeb47cffd43..9536ffa0473b 100644
> --- a/include/linux/kvm_host.h
> +++ b/include/linux/kvm_host.h
> @@ -153,10 +153,9 @@ static inline bool is_error_page(struct page *page)
>   * Bits 4-7 are reserved for more arch-independent bits.
>   */
>  #define KVM_REQ_TLB_FLUSH         (0 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
> -#define KVM_REQ_MMU_RELOAD        (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
> +#define KVM_REQ_VM_DEAD           (1 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
>  #define KVM_REQ_UNBLOCK           2
>  #define KVM_REQ_UNHALT            3
> -#define KVM_REQ_VM_DEAD           (4 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
>  #define KVM_REQ_GPC_INVALIDATE    (5 | KVM_REQUEST_WAIT | KVM_REQUEST_NO_WAKEUP)
>  #define KVM_REQUEST_ARCH_BASE     8
>
> --
> 2.35.1.574.g5d30c73bfb-goog
>