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i386/tdx: Track mem_ptr for each firmware entry of TDVF

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For each TDVF sections, QEMU needs to copy the content to guest
private memory via KVM API (KVM_TDX_INIT_MEM_REGION).

Introduce a field @mem_ptr for TdxFirmwareEntry to track the memory
pointer of each TDVF sections. So that QEMU can add/copy them to guest
private memory later.

TDVF sections can be classified into two groups:
 - Firmware itself, e.g., TDVF BFV and CFV, that located separately from
   guest RAM. Its memory pointer is the bios pointer.

 - Sections located at guest RAM, e.g., TEMP_MEM and TD_HOB.
   mmap a new memory range for them.

Register a machine_init_done callback to do the stuff.

Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Acked-by: Gerd Hoffmann <kraxel@redhat.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-21-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Xiaoyao Li 2025-05-08 10:59:26 -04:00 • committed by Paolo Bonzini
parent 49b1f0f812
commit 4420ba0ebb
3 changed files with 45 additions and 0 deletions
Download patch file Download diff file Expand all files Collapse all files

1
hw/i386/tdvf.c
View file

@ -179,6 +179,7 @@ int tdvf_parse_metadata(TdxFirmware *fw, void *flash_ptr, int size)
}
}
fw->mem_ptr = flash_ptr;
return 0;
err:

7
include/hw/i386/tdvf.h
View file

@ -26,13 +26,20 @@ typedef struct TdxFirmwareEntry {
uint64_t size;
uint32_t type;
uint32_t attributes;
void *mem_ptr;
} TdxFirmwareEntry;
typedef struct TdxFirmware {
void *mem_ptr;
uint32_t nr_entries;
TdxFirmwareEntry *entries;
} TdxFirmware;
#define for_each_tdx_fw_entry(fw, e) \
for (e = (fw)->entries; e != (fw)->entries + (fw)->nr_entries; e++)
int tdvf_parse_metadata(TdxFirmware *fw, void *flash_ptr, int size);
#endif /* HW_I386_TDVF_H */

37
target/i386/kvm/tdx.c
View file

@ -12,10 +12,13 @@
#include "qemu/osdep.h"
#include "qemu/error-report.h"
#include "qemu/base64.h"
#include "qemu/mmap-alloc.h"
#include "qapi/error.h"
#include "qom/object_interfaces.h"
#include "crypto/hash.h"
#include "system/system.h"
#include "hw/i386/tdvf.h"
#include "hw/i386/x86.h"
#include "kvm_i386.h"
#include "tdx.h"
@ -143,6 +146,38 @@ void tdx_set_tdvf_region(MemoryRegion *tdvf_mr)
tdx_guest->tdvf_mr = tdvf_mr;
}
static void tdx_finalize_vm(Notifier *notifier, void *unused)
{
TdxFirmware *tdvf = &tdx_guest->tdvf;
TdxFirmwareEntry *entry;
for_each_tdx_fw_entry(tdvf, entry) {
switch (entry->type) {
case TDVF_SECTION_TYPE_BFV:
case TDVF_SECTION_TYPE_CFV:
entry->mem_ptr = tdvf->mem_ptr + entry->data_offset;
break;
case TDVF_SECTION_TYPE_TD_HOB:
case TDVF_SECTION_TYPE_TEMP_MEM:
entry->mem_ptr = qemu_ram_mmap(-1, entry->size,
qemu_real_host_page_size(), 0, 0);
if (entry->mem_ptr == MAP_FAILED) {
error_report("Failed to mmap memory for TDVF section %d",
entry->type);
exit(1);
}
break;
default:
error_report("Unsupported TDVF section %d", entry->type);
exit(1);
}
}
}
static Notifier tdx_machine_done_notify = {
.notify = tdx_finalize_vm,
};
static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
{
TdxGuest *tdx = TDX_GUEST(cgs);
@ -157,6 +192,8 @@ static int tdx_kvm_init(ConfidentialGuestSupport *cgs, Error **errp)
}
}
qemu_add_machine_init_done_notifier(&tdx_machine_done_notify);
tdx_guest = tdx;
return 0;
}