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KVM: x86: Prepare kvm_hv_flush_tlb() to handle L2's GPAs

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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>
Reviewed-by: Sean Christopherson <seanjc@google.com>
Signed-off-by: Vitaly Kuznetsov <vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
Message-Id: <20221101145426.251680-14-vkuznets@redhat.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Vitaly Kuznetsov 2022-11-01 15:53:51 +01:00 committed by Paolo Bonzini
parent f84fcb6656
commit aee738236d
1 changed files with 14 additions and 0 deletions
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14
arch/x86/kvm/hyperv.c
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@ -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) {