diff mbox series

[v8,07/39] KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs

Message ID 20220714134929.1125828-8-vkuznets@redhat.com (mailing list archive)
State New, archived
Headers show
Series KVM: x86: hyper-v: Fine-grained TLB flush + L2 TLB flush features | expand

Commit Message

Vitaly Kuznetsov July 14, 2022, 1:48 p.m. UTC 
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@redhat.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
---
 arch/x86/kvm/hyperv.c | 7 +++++++
 1 file changed, 7 insertions(+)
diff mbox series

Patch

diff --git a/arch/x86/kvm/hyperv.c b/arch/x86/kvm/hyperv.c
index 783612e1fa3f..489a3918a757 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>
@@ -1915,6 +1916,12 @@  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) {