Commit aee73823 authored by Vitaly Kuznetsov's avatar Vitaly Kuznetsov Committed by Paolo Bonzini
Browse files

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: default avatarMaxim Levitsky <mlevitsk@redhat.com>
Reviewed-by: default avatarSean Christopherson <seanjc@google.com>
Signed-off-by: default avatarVitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-14-vkuznets@redhat.com>
Signed-off-by: default avatarPaolo Bonzini <pbonzini@redhat.com>
parent f84fcb66

arch/x86/kvm/hyperv.c

+14 −0
Original line number Diff line number Diff line
@@ -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 +1909,19 @@ 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) {