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    Subject[PATCH v3 06/34] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs
    Date
    To handle L2 TLB flush requests, KVM needs to translate the specified
    L2 GPA to L1 GPA to read hypercall arguments from there.

    No fucntional change as KVM doesn't handle VMCALL/VMMCALL from L2 yet.

    Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
    ---
    arch/x86/kvm/hyperv.c | 7 +++++++
    1 file changed, 7 insertions(+)

    diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
    index 1a6f9628cee9..fc4bb0ead9fa 100644
    --- a/arch/x86/kvm/hyperv.c
    +++ b/arch/x86/kvm/hyperv.c
    @@ -23,6 +23,7 @@
    #include "ioapic.h"
    #include "cpuid.h"
    #include "hyperv.h"
    +#include "mmu.h"
    #include "xen.h"

    #include <linux/cpu.h>
    @@ -1975,6 +1976,12 @@ static u64 kvm_hv_flush_tlb(struct kvm_vcpu *vcpu, struct kvm_hv_hcall *hc)
    */
    BUILD_BUG_ON(KVM_HV_MAX_SPARSE_VCPU_SET_BITS > 64);

    + if (!hc->fast && is_guest_mode(vcpu)) {
    + hc->ingpa = translate_nested_gpa(vcpu, hc->ingpa, 0, NULL);
    + if (unlikely(hc->ingpa == UNMAPPED_GVA))
    + return HV_STATUS_INVALID_HYPERCALL_INPUT;
    + }
    +
    if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST ||
    hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE) {
    if (hc->fast) {
    --
    2.35.1
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