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

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Date:   Fri, 25 Feb 2022 18:22:47 +0000
From:   Sean Christopherson <seanjc@...gle.com>
To:     Paolo Bonzini <pbonzini@...hat.com>,
        Christian Borntraeger <borntraeger@...ux.ibm.com>,
        Janosch Frank <frankja@...ux.ibm.com>
Cc:     David Hildenbrand <david@...hat.com>,
        Claudio Imbrenda <imbrenda@...ux.ibm.com>,
        Sean Christopherson <seanjc@...gle.com>,
        Vitaly Kuznetsov <vkuznets@...hat.com>,
        Wanpeng Li <wanpengli@...cent.com>,
        Jim Mattson <jmattson@...gle.com>,
        Joerg Roedel <joro@...tes.org>, kvm@...r.kernel.org,
        linux-kernel@...r.kernel.org, Ben Gardon <bgardon@...gle.com>,
        Lai Jiangshan <jiangshanlai@...il.com>
Subject: [PATCH v2 6/7] KVM: Drop KVM_REQ_MMU_RELOAD and update
 vcpu-requests.rst documentation

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>
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