From aee738236dca0d0870789138ec494e15d6303566 Mon Sep 17 00:00:00 2001 From: Vitaly Kuznetsov Date: Tue, 1 Nov 2022 15:53:51 +0100 Subject: KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs 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 Reviewed-by: Sean Christopherson Signed-off-by: Vitaly Kuznetsov Signed-off-by: Paolo Bonzini Message-Id: <20221101145426.251680-14-vkuznets@redhat.com> Signed-off-by: Paolo Bonzini --- arch/x86/kvm/hyperv.c | 14 ++++++++++++++ 1 file changed, 14 insertions(+) (limited to 'arch/x86/kvm/hyperv.c') diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c index fca9c51891f5..cb145987f5b8 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 @@ -1908,6 +1909,19 @@ 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); + /* + * 'Slow' hypercall's first parameter is the address in guest's memory + * where hypercall parameters are placed. This is either a GPA or a + * nested GPA when KVM is handling the call from L2 ('direct' TLB + * flush). Translate the address here so the memory can be uniformly + * read with kvm_read_guest(). + */ + if (!hc->fast && is_guest_mode(vcpu)) { + hc->ingpa = translate_nested_gpa(vcpu, hc->ingpa, 0, NULL); + if (unlikely(hc->ingpa == INVALID_GPA)) + return HV_STATUS_INVALID_HYPERCALL_INPUT; + } + if (hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_LIST || hc->code == HVCALL_FLUSH_VIRTUAL_ADDRESS_SPACE) { if (hc->fast) { -- cgit v1.2.3