[PATCH v19 085/130] KVM: TDX: Complete interrupts after tdexit

isaku.yamahata
2024-02-26T08:28:42Z

From: Isaku Yamahata <isaku.yamahata@intel.com>

This corresponds to VMX __vmx_complete_interrupts(). Because TDX
virtualize vAPIC, KVM only needs to care NMI injection.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Reviewed-by: Paolo Bonzini <pbonzini@redhat.com>
Reviewed-by: Binbin Wu <binbin.wu@linux.intel.com>
---
v19:
- move tdvps_management_check() to this patch
- typo: complete -> Complete in short log
---
arch/x86/kvm/vmx/tdx.c | 10 ++++++++++
arch/x86/kvm/vmx/tdx.h | 4 ++++
2 files changed, 14 insertions(+)

diff --git a/arch/x86/kvm/vmx/tdx.c b/arch/x86/kvm/vmx/tdx.c
index 83dcaf5b6fbd..b8b168f74dfe 100644
--- a/arch/x86/kvm/vmx/tdx.c
+++ b/arch/x86/kvm/vmx/tdx.c
@@ -535,6 +535,14 @@ void tdx_vcpu_reset(struct kvm_vcpu *vcpu, bool init_event)
*/
}

+static void tdx_complete_interrupts(struct kvm_vcpu *vcpu)
+{
+ /* Avoid costly SEAMCALL if no nmi was injected */
+ if (vcpu->arch.nmi_injected)
+ vcpu->arch.nmi_injected = td_management_read8(to_tdx(vcpu),
+ TD_VCPU_PEND_NMI);
+}
+
struct tdx_uret_msr {
u32 msr;
unsigned int slot;
@@ -663,6 +671,8 @@ fastpath_t tdx_vcpu_run(struct kvm_vcpu *vcpu)
vcpu->arch.regs_avail &= ~VMX_REGS_LAZY_LOAD_SET;
trace_kvm_exit(vcpu, KVM_ISA_VMX);

+ tdx_complete_interrupts(vcpu);
+
return EXIT_FASTPATH_NONE;
}

diff --git a/arch/x86/kvm/vmx/tdx.h b/arch/x86/kvm/vmx/tdx.h
index 44eab734e702..0d8a98feb58e 100644
--- a/arch/x86/kvm/vmx/tdx.h
+++ b/arch/x86/kvm/vmx/tdx.h
@@ -142,6 +142,8 @@ static __always_inline void tdvps_vmcs_check(u32 field, u8 bits)
"Invalid TD VMCS access for 16-bit field");
}

+static __always_inline void tdvps_management_check(u64 field, u8 bits) {}
+
#define TDX_BUILD_TDVPS_ACCESSORS(bits, uclass, lclass) \
static __always_inline u##bits td_##lclass##_read##bits(struct vcpu_tdx *tdx, \
u32 field) \
@@ -200,6 +202,8 @@ TDX_BUILD_TDVPS_ACCESSORS(16, VMCS, vmcs);
TDX_BUILD_TDVPS_ACCESSORS(32, VMCS, vmcs);
TDX_BUILD_TDVPS_ACCESSORS(64, VMCS, vmcs);

+TDX_BUILD_TDVPS_ACCESSORS(8, MANAGEMENT, management);
+
static __always_inline u64 td_tdcs_exec_read64(struct kvm_tdx *kvm_tdx, u32 field)
{
struct tdx_module_args out;
--
2.25.1