[RFC PATCH 40/42] KVM: VMX: Compose VMX specific meta data for KVM exported TDP

Yan Zhao
2023-12-02T10:05:01Z

Compose VMX specific meta data of KVM exported TDP. The format of the meta
data is defined in "asm/kvm_exported_tdp.h".

Intel VT-d driver can include "asm/kvm_exported_tdp.h" to decode this meta
data in order to check page table format, level, reserved zero bits before
loading KVM page tables with root HPA.

Signed-off-by: Yan Zhao <yan.y.zhao@intel.com>
---
arch/x86/kvm/vmx/vmx.c | 22 ++++++++++++++++++++++
1 file changed, 22 insertions(+)

diff --git a/arch/x86/kvm/vmx/vmx.c b/arch/x86/kvm/vmx/vmx.c
index f290dd3094da6..7965bc32f87de 100644
--- a/arch/x86/kvm/vmx/vmx.c
+++ b/arch/x86/kvm/vmx/vmx.c
@@ -48,6 +48,7 @@
#include <asm/mwait.h>
#include <asm/spec-ctrl.h>
#include <asm/vmx.h>
+#include <asm/kvm_exported_tdp.h>

#include "capabilities.h"
#include "cpuid.h"
@@ -8216,6 +8217,22 @@ static void vmx_vm_destroy(struct kvm *kvm)
free_pages((unsigned long)kvm_vmx->pid_table, vmx_get_pid_table_order(kvm));
}

+#ifdef CONFIG_KVM_INTEL_EXPORTED_EPT
+void kvm_exported_tdp_compose_meta(struct kvm_exported_tdp *tdp)
+{
+ struct kvm_exported_tdp_meta_vmx *meta = tdp->arch.meta;
+ struct kvm_mmu_common *context = &tdp->arch.mmu.common;
+ void *rsvd_bits_mask = context->shadow_zero_check.rsvd_bits_mask;
+
+ meta->root_hpa = context->root.hpa;
+ meta->level = context->root_role.level;
+ meta->max_huge_page_level = min(ept_caps_to_lpage_level(vmx_capability.ept),
+ KVM_MAX_HUGEPAGE_LEVEL);
+ memcpy(meta->rsvd_bits_mask, rsvd_bits_mask, sizeof(meta->rsvd_bits_mask));
+ meta->type = KVM_TDP_TYPE_EPT;
+}
+#endif
+
static struct kvm_x86_ops vmx_x86_ops __initdata = {
.name = KBUILD_MODNAME,

@@ -8357,6 +8374,11 @@ static struct kvm_x86_ops vmx_x86_ops __initdata = {
.complete_emulated_msr = kvm_complete_insn_gp,

.vcpu_deliver_sipi_vector = kvm_vcpu_deliver_sipi_vector,
+
+#ifdef CONFIG_KVM_INTEL_EXPORTED_EPT
+ .exported_tdp_meta_size = sizeof(struct kvm_exported_tdp_meta_vmx),
+ .exported_tdp_meta_compose = kvm_exported_tdp_compose_meta,
+#endif
};

static unsigned int vmx_handle_intel_pt_intr(void)
--
2.17.1