diff mbox series

[RFC,v2,23/44] i386/tdx: Use KVM_TDX_INIT_VCPU to pass HOB to TDVF

Message ID 3b5827e8f4004c332d679eb55c98e23cbe53dfeb.1625704981.git.isaku.yamahata@intel.com (mailing list archive)
State New, archived
Headers show
Series TDX support | expand

Commit Message

Isaku Yamahata July 8, 2021, 12:54 a.m. UTC 
From: Isaku Yamahata <isaku.yamahata@intel.com>

Specify the initial value for RCX/R8 to be the address of the HOB.
Don't propagate the value to Qemu's cache of the registers so as to
avoid implying that the register state is valid, e.g. Qemu doesn't model
TDX-SEAM behavior for initializing other GPRs.

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
---
 target/i386/kvm/tdx.c | 13 ++++++++++---
 1 file changed, 10 insertions(+), 3 deletions(-)
diff mbox series

Patch

diff --git a/target/i386/kvm/tdx.c b/target/i386/kvm/tdx.c
index 0cd649dd01..c348626dbf 100644
--- a/target/i386/kvm/tdx.c
+++ b/target/i386/kvm/tdx.c
@@ -285,10 +285,17 @@  out:
 
 void tdx_post_init_vcpu(CPUState *cpu)
 {
-    CPUX86State *env = &X86_CPU(cpu)->env;
+    MachineState *ms = MACHINE(qdev_get_machine());
+    TdxGuest *tdx = (TdxGuest *)object_dynamic_cast(OBJECT(ms->cgs),
+                                                    TYPE_TDX_GUEST);
+    TdxFirmwareEntry *hob;
+
+    if (!tdx) {
+        return;
+    }
 
-    _tdx_ioctl(cpu, KVM_TDX_INIT_VCPU, 0,
-               (void *)(unsigned long)env->regs[R_ECX]);
+    hob = tdx_get_hob_entry(tdx);
+    _tdx_ioctl(cpu, KVM_TDX_INIT_VCPU, 0, (void *)hob->address);
 }
 
 static bool tdx_guest_get_debug(Object *obj, Error **errp)