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KVM: TDX: Handle TDG.VP.VMCALL<ReportFatalError>

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Convert TDG.VP.VMCALL<ReportFatalError> to KVM_EXIT_SYSTEM_EVENT with
a new type KVM_SYSTEM_EVENT_TDX_FATAL and forward it to userspace for
handling.

TD guest can use TDG.VP.VMCALL<ReportFatalError> to report the fatal
error it has experienced.  This hypercall is special because TD guest
is requesting a termination with the error information, KVM needs to
forward the hypercall to userspace anyway, KVM doesn't do parsing or
conversion, it just dumps the 16 general-purpose registers to userspace
and let userspace decide what to do.

Signed-off-by: Binbin Wu <binbin.wu@linux.intel.com>
Message-ID: <20250222014225.897298-8-binbin.wu@linux.intel.com>
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Binbin Wu 2025-02-22 09:42:23 +08:00 committed by Paolo Bonzini
parent 2c30488083
commit 79462faa2b
3 changed files with 35 additions and 0 deletions
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6
Documentation/virt/kvm/api.rst
View File

@ -6823,6 +6823,7 @@ should put the acknowledged interrupt vector into the 'epr' field.
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
#define KVM_SYSTEM_EVENT_SEV_TERM 6
#define KVM_SYSTEM_EVENT_TDX_FATAL 7
__u32 type;
__u32 ndata;
__u64 data[16];
@ -6849,6 +6850,11 @@ Valid values for 'type' are:
reset/shutdown of the VM.
- KVM_SYSTEM_EVENT_SEV_TERM -- an AMD SEV guest requested termination.
The guest physical address of the guest's GHCB is stored in `data[0]`.
- KVM_SYSTEM_EVENT_TDX_FATAL -- a TDX guest reported a fatal error state.
KVM doesn't do any parsing or conversion, it just dumps 16 general-purpose
registers to userspace, in ascending order of the 4-bit indices for x86-64
general-purpose registers in instruction encoding, as defined in the Intel
SDM.
- KVM_SYSTEM_EVENT_WAKEUP -- the exiting vCPU is in a suspended state and
KVM has recognized a wakeup event. Userspace may honor this event by
marking the exiting vCPU as runnable, or deny it and call KVM_RUN again.

28
arch/x86/kvm/vmx/tdx.c
View File

@ -1104,11 +1104,39 @@ static int tdx_map_gpa(struct kvm_vcpu *vcpu)
return 1;
}
static int tdx_report_fatal_error(struct kvm_vcpu *vcpu)
{
struct vcpu_tdx *tdx = to_tdx(vcpu);
u64 *regs = vcpu->run->system_event.data;
u64 *module_regs = &tdx->vp_enter_args.r8;
int index = VCPU_REGS_RAX;
vcpu->run->exit_reason = KVM_EXIT_SYSTEM_EVENT;
vcpu->run->system_event.type = KVM_SYSTEM_EVENT_TDX_FATAL;
vcpu->run->system_event.ndata = 16;
/* Dump 16 general-purpose registers to userspace in ascending order. */
regs[index++] = tdx->vp_enter_ret;
regs[index++] = tdx->vp_enter_args.rcx;
regs[index++] = tdx->vp_enter_args.rdx;
regs[index++] = tdx->vp_enter_args.rbx;
regs[index++] = 0;
regs[index++] = 0;
regs[index++] = tdx->vp_enter_args.rsi;
regs[index] = tdx->vp_enter_args.rdi;
for (index = 0; index < 8; index++)
regs[VCPU_REGS_R8 + index] = module_regs[index];
return 0;
}
static int handle_tdvmcall(struct kvm_vcpu *vcpu)
{
switch (tdvmcall_leaf(vcpu)) {
case TDVMCALL_MAP_GPA:
return tdx_map_gpa(vcpu);
case TDVMCALL_REPORT_FATAL_ERROR:
return tdx_report_fatal_error(vcpu);
default:
break;
}

1
include/uapi/linux/kvm.h
View File

@ -375,6 +375,7 @@ struct kvm_run {
#define KVM_SYSTEM_EVENT_WAKEUP 4
#define KVM_SYSTEM_EVENT_SUSPEND 5
#define KVM_SYSTEM_EVENT_SEV_TERM 6
#define KVM_SYSTEM_EVENT_TDX_FATAL 7
__u32 type;
__u32 ndata;
union {