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qemu-kvm/SOURCES/kvm-i386-tdx-handle-TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUP.patch

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From e2157a814aa2a700736e97d2548460e9c6c808f2 Mon Sep 17 00:00:00 2001
From: Paolo Bonzini <pbonzini@redhat.com>
Date: Fri, 18 Jul 2025 18:03:50 +0200
Subject: [PATCH 101/115] i386/tdx: handle
TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT
RH-Author: Paolo Bonzini <pbonzini@redhat.com>
RH-MergeRequest: 391: TDX support, including attestation and device assignment
RH-Jira: RHEL-15710 RHEL-20798 RHEL-49728
RH-Acked-by: Yash Mankad <None>
RH-Acked-by: Peter Xu <peterx@redhat.com>
RH-Acked-by: David Hildenbrand <david@redhat.com>
RH-Commit: [101/115] 747409544735f7e2da43ce3906c0d0d487b5d78f (bonzini/rhel-qemu-kvm)
Record the interrupt vector and the apic id of the vcpu that calls
TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT.
Inject the interrupt to TD guest to notify the completion of <GetQuote>
when notify interrupt vector is valid.
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Link: https://lore.kernel.org/r/20250703024021.3559286-5-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
(cherry picked from commit efa742b23eff2a799c196d756bd506fe74e96fdc)
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
---
target/i386/kvm/kvm.c | 3 +++
target/i386/kvm/tdx-stub.c | 4 ++++
target/i386/kvm/tdx.c | 48 +++++++++++++++++++++++++++++++++++++-
target/i386/kvm/tdx.h | 7 ++++++
4 files changed, 61 insertions(+), 1 deletion(-)
diff --git a/target/i386/kvm/kvm.c b/target/i386/kvm/kvm.c
index fbf11b2122..f789965a33 100644
--- a/target/i386/kvm/kvm.c
+++ b/target/i386/kvm/kvm.c
@@ -6051,6 +6051,9 @@ int kvm_arch_handle_exit(CPUState *cs, struct kvm_run *run)
case TDVMCALL_GET_TD_VM_CALL_INFO:
tdx_handle_get_tdvmcall_info(cpu, run);
break;
+ case TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT:
+ tdx_handle_setup_event_notify_interrupt(cpu, run);
+ break;
}
ret = 0;
break;
diff --git a/target/i386/kvm/tdx-stub.c b/target/i386/kvm/tdx-stub.c
index 76fee49eff..1f0e108a69 100644
--- a/target/i386/kvm/tdx-stub.c
+++ b/target/i386/kvm/tdx-stub.c
@@ -26,3 +26,7 @@ void tdx_handle_get_quote(X86CPU *cpu, struct kvm_run *run)
void tdx_handle_get_tdvmcall_info(X86CPU *cpu, struct kvm_run *run)
{
}
+
+void tdx_handle_setup_event_notify_interrupt(X86CPU *cpu, struct kvm_run *run)
+{
+}
diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index a24e15571a..e56db74f58 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -28,10 +28,13 @@
#include "cpu.h"
#include "cpu-internal.h"
#include "host-cpu.h"
+#include "hw/i386/apic_internal.h"
+#include "hw/i386/apic-msidef.h"
#include "hw/i386/e820_memory_layout.h"
#include "hw/i386/tdvf.h"
#include "hw/i386/x86.h"
#include "hw/i386/tdvf-hob.h"
+#include "hw/pci/msi.h"
#include "kvm_i386.h"
#include "tdx.h"
#include "tdx-quote-generator.h"
@@ -1123,6 +1126,28 @@ int tdx_parse_tdvf(void *flash_ptr, int size)
return tdvf_parse_metadata(&tdx_guest->tdvf, flash_ptr, size);
}
+static void tdx_inject_interrupt(uint32_t apicid, uint32_t vector)
+{
+ int ret;
+
+ if (vector < 32 || vector > 255) {
+ return;
+ }
+
+ MSIMessage msg = {
+ .address = ((apicid & 0xff) << MSI_ADDR_DEST_ID_SHIFT) |
+ (((uint64_t)apicid & 0xffffff00) << 32),
+ .data = vector | (APIC_DM_FIXED << MSI_DATA_DELIVERY_MODE_SHIFT),
+ };
+
+ ret = kvm_irqchip_send_msi(kvm_state, msg);
+ if (ret < 0) {
+ /* In this case, no better way to tell it to guest. Log it. */
+ error_report("TDX: injection interrupt %d failed, interrupt lost (%s).",
+ vector, strerror(-ret));
+ }
+}
+
static void tdx_get_quote_completion(TdxGenerateQuoteTask *task)
{
TdxGuest *tdx = task->opaque;
@@ -1154,6 +1179,9 @@ static void tdx_get_quote_completion(TdxGenerateQuoteTask *task)
error_report("TDX: get-quote: failed to update GetQuote header.");
}
+ tdx_inject_interrupt(tdx_guest->event_notify_apicid,
+ tdx_guest->event_notify_vector);
+
g_free(task->send_data);
g_free(task->receive_buf);
g_free(task);
@@ -1256,7 +1284,7 @@ out_free:
g_free(task);
}
-#define SUPPORTED_TDVMCALLINFO_1_R11 (0)
+#define SUPPORTED_TDVMCALLINFO_1_R11 (TDG_VP_VMCALL_SUBFUNC_SET_EVENT_NOTIFY_INTERRUPT)
#define SUPPORTED_TDVMCALLINFO_1_R12 (0)
void tdx_handle_get_tdvmcall_info(X86CPU *cpu, struct kvm_run *run)
@@ -1277,6 +1305,21 @@ void tdx_handle_get_tdvmcall_info(X86CPU *cpu, struct kvm_run *run)
run->tdx.get_tdvmcall_info.ret = TDG_VP_VMCALL_SUCCESS;
}
+void tdx_handle_setup_event_notify_interrupt(X86CPU *cpu, struct kvm_run *run)
+{
+ uint64_t vector = run->tdx.setup_event_notify.vector;
+
+ if (vector >= 32 && vector < 256) {
+ qemu_mutex_lock(&tdx_guest->lock);
+ tdx_guest->event_notify_vector = vector;
+ tdx_guest->event_notify_apicid = cpu->apic_id;
+ qemu_mutex_unlock(&tdx_guest->lock);
+ run->tdx.setup_event_notify.ret = TDG_VP_VMCALL_SUCCESS;
+ } else {
+ run->tdx.setup_event_notify.ret = TDG_VP_VMCALL_INVALID_OPERAND;
+ }
+}
+
static void tdx_panicked_on_fatal_error(X86CPU *cpu, uint64_t error_code,
char *message, uint64_t gpa)
{
@@ -1477,6 +1520,9 @@ static void tdx_guest_init(Object *obj)
NULL, NULL);
qemu_mutex_init(&tdx->lock);
+
+ tdx->event_notify_vector = -1;
+ tdx->event_notify_apicid = -1;
}
static void tdx_guest_finalize(Object *obj)
diff --git a/target/i386/kvm/tdx.h b/target/i386/kvm/tdx.h
index d439078a87..1c38faf983 100644
--- a/target/i386/kvm/tdx.h
+++ b/target/i386/kvm/tdx.h
@@ -25,6 +25,7 @@ typedef struct TdxGuestClass {
#define TDVMCALL_GET_TD_VM_CALL_INFO 0x10000
#define TDVMCALL_GET_QUOTE 0x10002
+#define TDVMCALL_SETUP_EVENT_NOTIFY_INTERRUPT 0x10004
#define TDG_VP_VMCALL_SUCCESS 0x0000000000000000ULL
#define TDG_VP_VMCALL_RETRY 0x0000000000000001ULL
@@ -32,6 +33,8 @@ typedef struct TdxGuestClass {
#define TDG_VP_VMCALL_GPA_INUSE 0x8000000000000001ULL
#define TDG_VP_VMCALL_ALIGN_ERROR 0x8000000000000002ULL
+#define TDG_VP_VMCALL_SUBFUNC_SET_EVENT_NOTIFY_INTERRUPT BIT_ULL(1)
+
enum TdxRamType {
TDX_RAM_UNACCEPTED,
TDX_RAM_ADDED,
@@ -64,6 +67,9 @@ typedef struct TdxGuest {
/* GetQuote */
SocketAddress *qg_sock_addr;
int num;
+
+ uint32_t event_notify_vector;
+ uint32_t event_notify_apicid;
} TdxGuest;
#ifdef CONFIG_TDX
@@ -78,5 +84,6 @@ int tdx_parse_tdvf(void *flash_ptr, int size);
int tdx_handle_report_fatal_error(X86CPU *cpu, struct kvm_run *run);
void tdx_handle_get_quote(X86CPU *cpu, struct kvm_run *run);
void tdx_handle_get_tdvmcall_info(X86CPU *cpu, struct kvm_run *run);
+void tdx_handle_setup_event_notify_interrupt(X86CPU *cpu, struct kvm_run *run);
#endif /* QEMU_I386_TDX_H */
--
2.50.1
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