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KVM: TDX: Add a method to ignore hypercall patching

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Because guest TD memory is protected, VMM patching guest binary for
hypercall instruction isn't possible.  Add a method to ignore hypercall
patching.  Note: guest TD kernel needs to be modified to use
TDG.VP.VMCALL for hypercall.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250227012021.1778144-18-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Isaku Yamahata
2025-02-27 09:20:18 +08:00
committed by Paolo Bonzini
parent 79264ff080
commit 0b75889b0c
1 changed files with 14 additions and 1 deletions
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15
arch/x86/kvm/vmx/main.c
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@@ -673,6 +673,19 @@ static u32 vt_get_interrupt_shadow(struct kvm_vcpu *vcpu)
return vmx_get_interrupt_shadow(vcpu);
}
static void vt_patch_hypercall(struct kvm_vcpu *vcpu,
unsigned char *hypercall)
{
/*
* Because guest memory is protected, guest can't be patched. TD kernel
* is modified to use TDG.VP.VMCALL for hypercall.
*/
if (is_td_vcpu(vcpu))
return;
vmx_patch_hypercall(vcpu, hypercall);
}
static void vt_inject_irq(struct kvm_vcpu *vcpu, bool reinjected)
{
if (is_td_vcpu(vcpu))
@@ -952,7 +965,7 @@ struct kvm_x86_ops vt_x86_ops __initdata = {
.update_emulated_instruction = vmx_update_emulated_instruction,
.set_interrupt_shadow = vt_set_interrupt_shadow,
.get_interrupt_shadow = vt_get_interrupt_shadow,
.patch_hypercall = vmx_patch_hypercall,
.patch_hypercall = vt_patch_hypercall,
.inject_irq = vt_inject_irq,
.inject_nmi = vt_inject_nmi,
.inject_exception = vt_inject_exception,