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Subject[RFC PATCH 06/13] kvm: Add KVM_CAP_EXECONLY_MEM
Date
Add a KVM capability for the KVM_MEM_EXECONLY memslot type. This memslot
type is supported if the HW supports execute-only TDP.

Signed-off-by: Rick Edgecombe <rick.p.edgecombe@intel.com>
---
arch/x86/include/asm/kvm_host.h | 1 +
arch/x86/kvm/svm.c | 6 ++++++
arch/x86/kvm/vmx/vmx.c | 1 +
arch/x86/kvm/x86.c | 3 +++
include/uapi/linux/kvm.h | 1 +
5 files changed, 12 insertions(+)

diff --git a/arch/x86/include/asm/kvm_host.h b/arch/x86/include/asm/kvm_host.h
index 6d06c794d720..be3ff71e6227 100644
--- a/arch/x86/include/asm/kvm_host.h
+++ b/arch/x86/include/asm/kvm_host.h
@@ -1132,6 +1132,7 @@ struct kvm_x86_ops {
bool (*xsaves_supported)(void);
bool (*umip_emulated)(void);
bool (*pt_supported)(void);
+ bool (*tdp_xo_supported)(void);

int (*check_nested_events)(struct kvm_vcpu *vcpu, bool external_intr);
void (*request_immediate_exit)(struct kvm_vcpu *vcpu);
diff --git a/arch/x86/kvm/svm.c b/arch/x86/kvm/svm.c
index e0368076a1ef..f9f25f32e946 100644
--- a/arch/x86/kvm/svm.c
+++ b/arch/x86/kvm/svm.c
@@ -6005,6 +6005,11 @@ static bool svm_pt_supported(void)
return false;
}

+static bool svm_xo_supported(void)
+{
+ return false;
+}
+
static bool svm_has_wbinvd_exit(void)
{
return true;
@@ -7293,6 +7298,7 @@ static struct kvm_x86_ops svm_x86_ops __ro_after_init = {
.xsaves_supported = svm_xsaves_supported,
.umip_emulated = svm_umip_emulated,
.pt_supported = svm_pt_supported,
+ .tdp_xo_supported = svm_xo_supported,

.set_supported_cpuid = svm_set_supported_cpuid,

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index a30dbab8a2d4..7e7260c715f2 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -7767,6 +7767,7 @@ static struct kvm_x86_ops vmx_x86_ops __ro_after_init = {
.xsaves_supported = vmx_xsaves_supported,
.umip_emulated = vmx_umip_emulated,
.pt_supported = vmx_pt_supported,
+ .tdp_xo_supported = cpu_has_vmx_ept_execute_only,

.request_immediate_exit = vmx_request_immediate_exit,

diff --git a/arch/x86/kvm/x86.c b/arch/x86/kvm/x86.c
index 2e321d788672..810cfdb1a315 100644
--- a/arch/x86/kvm/x86.c
+++ b/arch/x86/kvm/x86.c
@@ -3183,6 +3183,9 @@ int kvm_vm_ioctl_check_extension(struct kvm *kvm, long ext)
r = kvm_x86_ops->get_nested_state ?
kvm_x86_ops->get_nested_state(NULL, NULL, 0) : 0;
break;
+ case KVM_CAP_EXECONLY_MEM:
+ r = kvm_x86_ops->tdp_xo_supported();
+ break;
default:
break;
}
diff --git a/include/uapi/linux/kvm.h b/include/uapi/linux/kvm.h
index ede487b7b216..7778a1f03b78 100644
--- a/include/uapi/linux/kvm.h
+++ b/include/uapi/linux/kvm.h
@@ -997,6 +997,7 @@ struct kvm_ppc_resize_hpt {
#define KVM_CAP_ARM_PTRAUTH_ADDRESS 171
#define KVM_CAP_ARM_PTRAUTH_GENERIC 172
#define KVM_CAP_PMU_EVENT_FILTER 173
+#define KVM_CAP_EXECONLY_MEM 174

#ifdef KVM_CAP_IRQ_ROUTING

--
2.17.1
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