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    Subject[RFC 12/16] x86/kvm: Share steal time page with host
    Date
    struct kvm_steal_time is shared between guest and host. Mark it as
    shared.

    Signed-off-by: Kirill A. Shutemov <kirill.shutemov@linux.intel.com>
    ---
    arch/x86/kernel/kvm.c | 6 +++++-
    1 file changed, 5 insertions(+), 1 deletion(-)

    diff --git a/arch/x86/kernel/kvm.c b/arch/x86/kernel/kvm.c
    index f50d65df4412..b0f445796ed1 100644
    --- a/arch/x86/kernel/kvm.c
    +++ b/arch/x86/kernel/kvm.c
    @@ -286,11 +286,15 @@ static void kvm_register_steal_time(void)
    {
    int cpu = smp_processor_id();
    struct kvm_steal_time *st = &per_cpu(steal_time, cpu);
    + unsigned long phys;

    if (!has_steal_clock)
    return;

    - wrmsrl(MSR_KVM_STEAL_TIME, (slow_virt_to_phys(st) | KVM_MSR_ENABLED));
    + phys = slow_virt_to_phys(st);
    + if (kvm_mem_protected())
    + kvm_hypercall2(KVM_HC_MEM_SHARE, phys >> PAGE_SHIFT, 1);
    + wrmsrl(MSR_KVM_STEAL_TIME, (phys | KVM_MSR_ENABLED));
    pr_info("kvm-stealtime: cpu %d, msr %llx\n",
    cpu, (unsigned long long) slow_virt_to_phys(st));
    }
    --
    2.26.2
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