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i386/tdx: load TDVF for TD guest

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TDVF(OVMF) needs to run at private memory for TD guest. TDX cannot
support pflash device since it doesn't support read-only private memory.
Thus load TDVF(OVMF) with -bios option for TDs.

Use memory_region_init_ram_guest_memfd() to allocate the MemoryRegion
for TDVF because it needs to be located at private memory.

Also store the MemoryRegion pointer of TDVF since the shared ramblock of
it can be discared after it gets copied to private ramblock.

Signed-off-by: Chao Peng <chao.p.peng@linux.intel.com>
Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
Reviewed-by: Zhao Liu <zhao1.liu@intel.com>
Link: https://lore.kernel.org/r/20250508150002.689633-17-xiaoyao.li@intel.com
Signed-off-by: Paolo Bonzini <pbonzini@redhat.com>
This commit is contained in:
Chao Peng 2025-05-08 10:59:22 -04:00 • committed by Paolo Bonzini
parent 0e73b84361
commit 0dd5fe5ebe
3 changed files with 14 additions and 1 deletions
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6
hw/i386/x86-common.c
View file

@ -44,6 +44,7 @@
#include "standard-headers/asm-x86/bootparam.h"
#include CONFIG_DEVICES
#include "kvm/kvm_i386.h"
#include "kvm/tdx.h"
#ifdef CONFIG_XEN_EMU
#include "hw/xen/xen.h"
@ -1035,11 +1036,14 @@ void x86_bios_rom_init(X86MachineState *x86ms, const char *default_firmware,
if (machine_require_guest_memfd(MACHINE(x86ms))) {
memory_region_init_ram_guest_memfd(&x86ms->bios, NULL, "pc.bios",
bios_size, &error_fatal);
if (is_tdx_vm()) {
tdx_set_tdvf_region(&x86ms->bios);
}
} else {
memory_region_init_ram(&x86ms->bios, NULL, "pc.bios",
bios_size, &error_fatal);
}
if (sev_enabled()) {
if (sev_enabled() || is_tdx_vm()) {
/*
* The concept of a "reset" simply doesn't exist for
* confidential computing guests, we have to destroy and