On Fri, Oct 21, 2022, Vitaly Kuznetsov wrote:
> To handle L2 TLB flush requests, KVM needs to translate the specified
> L2 GPA to L1 GPA to read hypercall arguments from there.
>
> No functional change as KVM doesn't handle VMCALL/VMMCALL from L2 yet.
>
> Reviewed-by: Maxim Levitsky <mlevitsk@xxxxxxxxxx>
> Signed-off-by: Vitaly Kuznetsov <vkuznets@xxxxxxxxxx>
> ---
> 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 fca9c51891f5..df1efb821eb0 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>
> @@ -1908,6 +1909,12 @@ 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)) {
Please add a comment explaining why only "slow" hypercalls need to translate the
GPA from L2=>L1.
With a comment (and assuming this isn't a bug),
Reviewed-by: Sean Christopherson <seanjc@xxxxxxxxxx>
