[PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Sean Christopherson]

Replace the existing kvm_x86_ops.need_emulation_on_page_fault() with a
more generic is_emulatable(), and unconditionally call the new function
in x86_emulate_instruction().

KVM will use the generic hook to support multiple security related
technologies that prevent emulation in one way or another.  Similar to
the existing AMD #NPF case where emulation of the current instruction is
not possible due to lack of information, AMD's SEV-ES and Intel's SGX
and TDX will introduce scenarios where emulation is impossible due to
the guest's register state being inaccessible.  And again similar to the
existing #NPF case, emulation can be initiated by kvm_mmu_page_fault(),
i.e. outside of the control of vendor-specific code.

While the cause and architecturally visible behavior of the various
cases are different, e.g. SGX will inject a #UD, AMD #NPF is a clean
resume or complete shutdown, and SEV-ES and TDX "return" an error, the
impact on the common emulation code is identical: KVM must stop
emulation immediately and resume the guest.

Query is_emulatable() in handle_ud() as well so that the
force_emulation_prefix code doesn't incorrectly modify RIP before
calling emulate_instruction() in the absurdly unlikely scenario that
KVM encounters forced emulation in conjunction with "do not emulate".

Cc: Tom Lendacky <thomas.lendacky@amd.com>
Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
---
 arch/x86/include/asm/kvm_host.h |  2 +-
 arch/x86/kvm/mmu/mmu.c          | 12 ------------
 arch/x86/kvm/svm/svm.c          | 31 ++++++++++++++++++-------------
 arch/x86/kvm/vmx/vmx.c          | 12 ++++++------
 arch/x86/kvm/x86.c              |  9 ++++++++-
 5 files changed, 33 insertions(+), 33 deletions(-)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 5303dbc5c9bc..fa89511ed9d6 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1221,7 +1221,7 @@ struct kvm_x86_ops {
 
 	int (*get_msr_feature)(struct kvm_msr_entry *entry);
 
-	bool (*need_emulation_on_page_fault)(struct kvm_vcpu *vcpu);
+	bool (*is_emulatable)(struct kvm_vcpu *vcpu, void *insn, int insn_len);
 
 	bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
 	int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
index a5d0207e7189..f818a46db58c 100644
--- a/arch/x86/kvm/mmu/mmu.c
+++ b/arch/x86/kvm/mmu/mmu.c
@@ -5485,18 +5485,6 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
 	if (!mmio_info_in_cache(vcpu, cr2_or_gpa, direct) && !is_guest_mode(vcpu))
 		emulation_type |= EMULTYPE_ALLOW_RETRY_PF;
 emulate:
-	/*
-	 * On AMD platforms, under certain conditions insn_len may be zero on #NPF.
-	 * This can happen if a guest gets a page-fault on data access but the HW
-	 * table walker is not able to read the instruction page (e.g instruction
-	 * page is not present in memory). In those cases we simply restart the
-	 * guest, with the exception of AMD Erratum 1096 which is unrecoverable.
-	 */
-	if (unlikely(insn && !insn_len)) {
-		if (!kvm_x86_ops.need_emulation_on_page_fault(vcpu))
-			return 1;
-	}
-
 	return x86_emulate_instruction(vcpu, cr2_or_gpa, emulation_type, insn,
 				       insn_len);
 }
diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
index 03dd7bac8034..3a55495d985f 100644
--- a/arch/x86/kvm/svm/svm.c
+++ b/arch/x86/kvm/svm/svm.c
@@ -3933,19 +3933,10 @@ static void enable_smi_window(struct kvm_vcpu *vcpu)
 	}
 }
 
-static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
+static bool svm_is_emulatable(struct kvm_vcpu *vcpu, void *insn, int insn_len)
 {
-	unsigned long cr4 = kvm_read_cr4(vcpu);
-	bool smep = cr4 & X86_CR4_SMEP;
-	bool smap = cr4 & X86_CR4_SMAP;
-	bool is_user = svm_get_cpl(vcpu) == 3;
-
-	/*
-	 * If RIP is invalid, go ahead with emulation which will cause an
-	 * internal error exit.
-	 */
-	if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
-		return true;
+	bool smep, smap, is_user;
+	unsigned long cr4;
 
 	/*
 	 * Detect and workaround Errata 1096 Fam_17h_00_0Fh.
@@ -3987,6 +3978,20 @@ static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
 	 * instruction pointer so we will not able to workaround it. Lets
 	 * print the error and request to kill the guest.
 	 */
+	if (likely(!insn || insn_len))
+		return true;
+
+	/*
+	 * If RIP is invalid, go ahead with emulation which will cause an
+	 * internal error exit.
+	 */
+	if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
+		return true;
+
+	cr4 = kvm_read_cr4(vcpu);
+	smep = cr4 & X86_CR4_SMEP;
+	smap = cr4 & X86_CR4_SMAP;
+	is_user = svm_get_cpl(vcpu) == 3;
 	if (smap && (!smep || is_user)) {
 		if (!sev_guest(vcpu->kvm))
 			return true;
@@ -4148,7 +4153,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
 	.mem_enc_reg_region = svm_register_enc_region,
 	.mem_enc_unreg_region = svm_unregister_enc_region,
 
-	.need_emulation_on_page_fault = svm_need_emulation_on_page_fault,
+	.is_emulatable = svm_is_emulatable,
 
 	.apic_init_signal_blocked = svm_apic_init_signal_blocked,
 };
diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index 46ba2e03a892..c92717c54bf9 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -1561,6 +1561,11 @@ static int vmx_rtit_ctl_check(struct kvm_vcpu *vcpu, u64 data)
 	return 0;
 }
 
+static bool vmx_is_emulatable(struct kvm_vcpu *vcpu, void *insn, int insn_len)
+{
+	return true;
+}
+
 static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
 {
 	unsigned long rip, orig_rip;
@@ -7843,11 +7848,6 @@ static void enable_smi_window(struct kvm_vcpu *vcpu)
 	/* RSM will cause a vmexit anyway.  */
 }
 
-static bool vmx_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
-{
-	return false;
-}
-
 static bool vmx_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
 {
 	return to_vmx(vcpu)->nested.vmxon;
@@ -8002,7 +8002,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
 	.pre_leave_smm = vmx_pre_leave_smm,
 	.enable_smi_window = enable_smi_window,
 
-	.need_emulation_on_page_fault = vmx_need_emulation_on_page_fault,
+	.is_emulatable = vmx_is_emulatable,
 	.apic_init_signal_blocked = vmx_apic_init_signal_blocked,
 	.migrate_timers = vmx_migrate_timers,
 };
diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 539ea1cd6020..5208217049d9 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -5707,6 +5707,9 @@ int handle_ud(struct kvm_vcpu *vcpu)
 	char sig[5]; /* ud2; .ascii "kvm" */
 	struct x86_exception e;
 
+	if (unlikely(!kvm_x86_ops.is_emulatable(vcpu, NULL, 0)))
+		return 1;
+
 	if (force_emulation_prefix &&
 	    kvm_read_guest_virt(vcpu, kvm_get_linear_rip(vcpu),
 				sig, sizeof(sig), &e) == 0 &&
@@ -6912,7 +6915,10 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	int r;
 	struct x86_emulate_ctxt *ctxt = vcpu->arch.emulate_ctxt;
 	bool writeback = true;
-	bool write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
+	bool write_fault_to_spt;
+
+	if (unlikely(!kvm_x86_ops.is_emulatable(vcpu, insn, insn_len)))
+		return 1;
 
 	vcpu->arch.l1tf_flush_l1d = true;
 
@@ -6920,6 +6926,7 @@ int x86_emulate_instruction(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa,
 	 * Clear write_fault_to_shadow_pgtable here to ensure it is
 	 * never reused.
 	 */
+	write_fault_to_spt = vcpu->arch.write_fault_to_shadow_pgtable;
 	vcpu->arch.write_fault_to_shadow_pgtable = false;
 	kvm_clear_exception_queue(vcpu);
 
-- 
2.28.0

Re: [PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Wanpeng Li]

On Wed, 16 Sep 2020 at 07:29, Sean Christopherson
<sean.j.christopherson@intel.com> wrote:
>
> Replace the existing kvm_x86_ops.need_emulation_on_page_fault() with a
> more generic is_emulatable(), and unconditionally call the new function
> in x86_emulate_instruction().
>
> KVM will use the generic hook to support multiple security related
> technologies that prevent emulation in one way or another.  Similar to
> the existing AMD #NPF case where emulation of the current instruction is
> not possible due to lack of information, AMD's SEV-ES and Intel's SGX
> and TDX will introduce scenarios where emulation is impossible due to
> the guest's register state being inaccessible.  And again similar to the
> existing #NPF case, emulation can be initiated by kvm_mmu_page_fault(),
> i.e. outside of the control of vendor-specific code.
>
> While the cause and architecturally visible behavior of the various
> cases are different, e.g. SGX will inject a #UD, AMD #NPF is a clean
> resume or complete shutdown, and SEV-ES and TDX "return" an error, the
> impact on the common emulation code is identical: KVM must stop
> emulation immediately and resume the guest.
>
> Query is_emulatable() in handle_ud() as well so that the
> force_emulation_prefix code doesn't incorrectly modify RIP before
> calling emulate_instruction() in the absurdly unlikely scenario that
> KVM encounters forced emulation in conjunction with "do not emulate".
>
> Cc: Tom Lendacky <thomas.lendacky@amd.com>
> Signed-off-by: Sean Christopherson <sean.j.christopherson@intel.com>
> ---
>  arch/x86/include/asm/kvm_host.h |  2 +-
>  arch/x86/kvm/mmu/mmu.c          | 12 ------------
>  arch/x86/kvm/svm/svm.c          | 31 ++++++++++++++++++-------------
>  arch/x86/kvm/vmx/vmx.c          | 12 ++++++------
>  arch/x86/kvm/x86.c              |  9 ++++++++-
>  5 files changed, 33 insertions(+), 33 deletions(-)
>
> diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
> index 5303dbc5c9bc..fa89511ed9d6 100644
> --- a/arch/x86/include/asm/kvm_host.h
> +++ b/arch/x86/include/asm/kvm_host.h
> @@ -1221,7 +1221,7 @@ struct kvm_x86_ops {
>
>         int (*get_msr_feature)(struct kvm_msr_entry *entry);
>
> -       bool (*need_emulation_on_page_fault)(struct kvm_vcpu *vcpu);
> +       bool (*is_emulatable)(struct kvm_vcpu *vcpu, void *insn, int insn_len);
>
>         bool (*apic_init_signal_blocked)(struct kvm_vcpu *vcpu);
>         int (*enable_direct_tlbflush)(struct kvm_vcpu *vcpu);
> diff --git a/arch/x86/kvm/mmu/mmu.c b/arch/x86/kvm/mmu/mmu.c
> index a5d0207e7189..f818a46db58c 100644
> --- a/arch/x86/kvm/mmu/mmu.c
> +++ b/arch/x86/kvm/mmu/mmu.c
> @@ -5485,18 +5485,6 @@ int kvm_mmu_page_fault(struct kvm_vcpu *vcpu, gpa_t cr2_or_gpa, u64 error_code,
>         if (!mmio_info_in_cache(vcpu, cr2_or_gpa, direct) && !is_guest_mode(vcpu))
>                 emulation_type |= EMULTYPE_ALLOW_RETRY_PF;
>  emulate:
> -       /*
> -        * On AMD platforms, under certain conditions insn_len may be zero on #NPF.
> -        * This can happen if a guest gets a page-fault on data access but the HW
> -        * table walker is not able to read the instruction page (e.g instruction
> -        * page is not present in memory). In those cases we simply restart the
> -        * guest, with the exception of AMD Erratum 1096 which is unrecoverable.
> -        */
> -       if (unlikely(insn && !insn_len)) {
> -               if (!kvm_x86_ops.need_emulation_on_page_fault(vcpu))
> -                       return 1;
> -       }
> -
>         return x86_emulate_instruction(vcpu, cr2_or_gpa, emulation_type, insn,
>                                        insn_len);
>  }
> diff --git a/arch/x86/kvm/svm/svm.c b/arch/x86/kvm/svm/svm.c
> index 03dd7bac8034..3a55495d985f 100644
> --- a/arch/x86/kvm/svm/svm.c
> +++ b/arch/x86/kvm/svm/svm.c
> @@ -3933,19 +3933,10 @@ static void enable_smi_window(struct kvm_vcpu *vcpu)
>         }
>  }
>
> -static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
> +static bool svm_is_emulatable(struct kvm_vcpu *vcpu, void *insn, int insn_len)
>  {
> -       unsigned long cr4 = kvm_read_cr4(vcpu);
> -       bool smep = cr4 & X86_CR4_SMEP;
> -       bool smap = cr4 & X86_CR4_SMAP;
> -       bool is_user = svm_get_cpl(vcpu) == 3;
> -
> -       /*
> -        * If RIP is invalid, go ahead with emulation which will cause an
> -        * internal error exit.
> -        */
> -       if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
> -               return true;
> +       bool smep, smap, is_user;
> +       unsigned long cr4;
>
>         /*
>          * Detect and workaround Errata 1096 Fam_17h_00_0Fh.
> @@ -3987,6 +3978,20 @@ static bool svm_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
>          * instruction pointer so we will not able to workaround it. Lets
>          * print the error and request to kill the guest.
>          */
> +       if (likely(!insn || insn_len))
> +               return true;
> +
> +       /*
> +        * If RIP is invalid, go ahead with emulation which will cause an
> +        * internal error exit.
> +        */
> +       if (!kvm_vcpu_gfn_to_memslot(vcpu, kvm_rip_read(vcpu) >> PAGE_SHIFT))
> +               return true;
> +
> +       cr4 = kvm_read_cr4(vcpu);
> +       smep = cr4 & X86_CR4_SMEP;
> +       smap = cr4 & X86_CR4_SMAP;
> +       is_user = svm_get_cpl(vcpu) == 3;
>         if (smap && (!smep || is_user)) {
>                 if (!sev_guest(vcpu->kvm))
>                         return true;
> @@ -4148,7 +4153,7 @@ static struct kvm_x86_ops svm_x86_ops __initdata = {
>         .mem_enc_reg_region = svm_register_enc_region,
>         .mem_enc_unreg_region = svm_unregister_enc_region,
>
> -       .need_emulation_on_page_fault = svm_need_emulation_on_page_fault,
> +       .is_emulatable = svm_is_emulatable,
>
>         .apic_init_signal_blocked = svm_apic_init_signal_blocked,
>  };
> diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
> index 46ba2e03a892..c92717c54bf9 100644
> --- a/arch/x86/kvm/vmx/vmx.c
> +++ b/arch/x86/kvm/vmx/vmx.c
> @@ -1561,6 +1561,11 @@ static int vmx_rtit_ctl_check(struct kvm_vcpu *vcpu, u64 data)
>         return 0;
>  }
>
> +static bool vmx_is_emulatable(struct kvm_vcpu *vcpu, void *insn, int insn_len)
> +{
> +       return true;
> +}
> +
>  static int skip_emulated_instruction(struct kvm_vcpu *vcpu)
>  {
>         unsigned long rip, orig_rip;
> @@ -7843,11 +7848,6 @@ static void enable_smi_window(struct kvm_vcpu *vcpu)
>         /* RSM will cause a vmexit anyway.  */
>  }
>
> -static bool vmx_need_emulation_on_page_fault(struct kvm_vcpu *vcpu)
> -{
> -       return false;
> -}
> -
>  static bool vmx_apic_init_signal_blocked(struct kvm_vcpu *vcpu)
>  {
>         return to_vmx(vcpu)->nested.vmxon;
> @@ -8002,7 +8002,7 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
>         .pre_leave_smm = vmx_pre_leave_smm,
>         .enable_smi_window = enable_smi_window,
>
> -       .need_emulation_on_page_fault = vmx_need_emulation_on_page_fault,
> +       .is_emulatable = vmx_is_emulatable,
>         .apic_init_signal_blocked = vmx_apic_init_signal_blocked,
>         .migrate_timers = vmx_migrate_timers,
>  };
> diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> index 539ea1cd6020..5208217049d9 100644
> --- a/arch/x86/kvm/x86.c
> +++ b/arch/x86/kvm/x86.c
> @@ -5707,6 +5707,9 @@ int handle_ud(struct kvm_vcpu *vcpu)
>         char sig[5]; /* ud2; .ascii "kvm" */
>         struct x86_exception e;
>
> +       if (unlikely(!kvm_x86_ops.is_emulatable(vcpu, NULL, 0)))
> +               return 1;
> +

Both VMX and SVM scenarios always fail this check.

    Wanpeng

Re: [PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Sean Christopherson]

On Wed, Sep 16, 2020 at 09:31:22AM +0800, Wanpeng Li wrote:
> On Wed, 16 Sep 2020 at 07:29, Sean Christopherson
> <sean.j.christopherson@intel.com> wrote:
> >
> > Replace the existing kvm_x86_ops.need_emulation_on_page_fault() with a
> > more generic is_emulatable(), and unconditionally call the new function
> > in x86_emulate_instruction().
> >
> > KVM will use the generic hook to support multiple security related
> > technologies that prevent emulation in one way or another.  Similar to
> > the existing AMD #NPF case where emulation of the current instruction is
> > not possible due to lack of information, AMD's SEV-ES and Intel's SGX
> > and TDX will introduce scenarios where emulation is impossible due to
> > the guest's register state being inaccessible.  And again similar to the
> > existing #NPF case, emulation can be initiated by kvm_mmu_page_fault(),
> > i.e. outside of the control of vendor-specific code.
> >
> > While the cause and architecturally visible behavior of the various
> > cases are different, e.g. SGX will inject a #UD, AMD #NPF is a clean
> > resume or complete shutdown, and SEV-ES and TDX "return" an error, the
> > impact on the common emulation code is identical: KVM must stop
> > emulation immediately and resume the guest.
> >
> > Query is_emulatable() in handle_ud() as well so that the
> > force_emulation_prefix code doesn't incorrectly modify RIP before
> > calling emulate_instruction() in the absurdly unlikely scenario that
> > KVM encounters forced emulation in conjunction with "do not emulate".

...

> > diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
> > index 539ea1cd6020..5208217049d9 100644
> > --- a/arch/x86/kvm/x86.c
> > +++ b/arch/x86/kvm/x86.c
> > @@ -5707,6 +5707,9 @@ int handle_ud(struct kvm_vcpu *vcpu)
> >         char sig[5]; /* ud2; .ascii "kvm" */
> >         struct x86_exception e;
> >
> > +       if (unlikely(!kvm_x86_ops.is_emulatable(vcpu, NULL, 0)))
> > +               return 1;
> > +
> 
> Both VMX and SVM scenarios always fail this check.

Ah, right.  This patch was extracted from my SGX series, in which case there
would be a follow-up patch to add a VMX scenario where is_emulated() could
return false.

The intent of posting the patch standalone is so that SGX, SEV-ES, and/or TDX
have "ready to go" support in upstream, i.e. can change only the VMX/SVM
implementation of is_emulated().  I'm a-ok dropping the handle_ud() change,
or even the whole patch, until one of the above three is actually ready for
inclusion.

Re: [PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Paolo Bonzini]

On 16/09/20 01:27, Sean Christopherson wrote:
> Replace the existing kvm_x86_ops.need_emulation_on_page_fault() with a
> more generic is_emulatable(), and unconditionally call the new function
> in x86_emulate_instruction().
> 
> KVM will use the generic hook to support multiple security related
> technologies that prevent emulation in one way or another.  Similar to
> the existing AMD #NPF case where emulation of the current instruction is
> not possible due to lack of information, AMD's SEV-ES and Intel's SGX
> and TDX will introduce scenarios where emulation is impossible due to
> the guest's register state being inaccessible.  And again similar to the
> existing #NPF case, emulation can be initiated by kvm_mmu_page_fault(),
> i.e. outside of the control of vendor-specific code.
> 
> While the cause and architecturally visible behavior of the various
> cases are different, e.g. SGX will inject a #UD, AMD #NPF is a clean
> resume or complete shutdown, and SEV-ES and TDX "return" an error, the
> impact on the common emulation code is identical: KVM must stop
> emulation immediately and resume the guest.
> 
> Query is_emulatable() in handle_ud() as well so that the
> force_emulation_prefix code doesn't incorrectly modify RIP before
> calling emulate_instruction() in the absurdly unlikely scenario that
> KVM encounters forced emulation in conjunction with "do not emulate".

Ahah, I love those adverb + adjective pairs (my favorite is
https://patchwork.kernel.org/cover/10710751/ which unfortunately was in
the cover letter and thus was not immortalized in linux.git).

"is_emulatable" is not very grammatical, so I'd rather call it
"can_emulate_instruction" instead.  Either way, it's an improvement over
"need".  Queued, thanks.

Paolo

Re: [PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Paolo Bonzini]

On 16/09/20 19:34, Sean Christopherson wrote:
> 
> The intent of posting the patch standalone is so that SGX, SEV-ES, and/or TDX
> have "ready to go" support in upstream, i.e. can change only the VMX/SVM
> implementation of is_emulated().  I'm a-ok dropping the handle_ud() change,
> or even the whole patch, until one of the above three is actually ready for
> inclusion.

I think it's fine with the "can" in the name.  Hopefully one of the
three will go in soon...

Paolo

Re: [PATCH] KVM: x86: Add kvm_x86_ops hook to short circuit emulation

[Sean Christopherson]

On Tue, Sep 22, 2020 at 03:32:58PM +0200, Paolo Bonzini wrote:
> On 16/09/20 19:34, Sean Christopherson wrote:
> > 
> > The intent of posting the patch standalone is so that SGX, SEV-ES, and/or TDX
> > have "ready to go" support in upstream, i.e. can change only the VMX/SVM
> > implementation of is_emulated().  I'm a-ok dropping the handle_ud() change,
> > or even the whole patch, until one of the above three is actually ready for
> > inclusion.
> 
> I think it's fine with the "can" in the name.  Hopefully one of the
> three will go in soon...

FWIW, the changelog still references is_emulated().  Probably not worth
rewriting history though.