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    Subject[RFC PATCH 23/67] KVM: Add per-VM flag to disable dirty logging of memslots for TDs
    Date
    From: Sean Christopherson <sean.j.christopherson@intel.com>

    Add a flag for TDX to mark dirty logging as unsupported.

    Suggested-by: Kai Huang <kai.huang@intel.com>
    Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
    ---
    include/linux/kvm_host.h | 1 +
    virt/kvm/kvm_main.c | 5 ++++-
    2 files changed, 5 insertions(+), 1 deletion(-)

    diff --git a/include/linux/kvm_host.h b/include/linux/kvm_host.h
    index 1a0df7b83fd0..9682282cb258 100644
    --- a/include/linux/kvm_host.h
    +++ b/include/linux/kvm_host.h
    @@ -517,6 +517,7 @@ struct kvm {
    pid_t userspace_pid;
    unsigned int max_halt_poll_ns;

    + bool dirty_log_unsupported;
    #ifdef __KVM_HAVE_READONLY_MEM
    bool readonly_mem_unsupported;
    #endif
    diff --git a/virt/kvm/kvm_main.c b/virt/kvm/kvm_main.c
    index 572a66a61c29..aa5f27753756 100644
    --- a/virt/kvm/kvm_main.c
    +++ b/virt/kvm/kvm_main.c
    @@ -1103,7 +1103,10 @@ static void update_memslots(struct kvm_memslots *slots,
    static int check_memory_region_flags(struct kvm *kvm,
    const struct kvm_userspace_memory_region *mem)
    {
    - u32 valid_flags = KVM_MEM_LOG_DIRTY_PAGES;
    + u32 valid_flags = 0;
    +
    + if (!kvm->dirty_log_unsupported)
    + valid_flags |= KVM_MEM_LOG_DIRTY_PAGES;

    #ifdef __KVM_HAVE_READONLY_MEM
    if (!kvm->readonly_mem_unsupported)
    --
    2.17.1
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