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i386/tdx: register TDVF as private memory

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Allocate the dedicated memory to hold bios image instead of re-using
mmapped guest memory because the initial memory conversion to private
memory wipes out the bios image by madvise(REMOVE).

Signed-off-by: Isaku Yamahata <isaku.yamahata@intel.com>
Co-developed-by: Xiaoyao Li <xiaoyao.li@intel.com>
Signed-off-by: Xiaoyao Li <xiaoyao.li@intel.com>
This commit is contained in:
Chao Peng
2022-06-18 10:50:42 +08:00
committed by Nikolay Borisov
parent 2d3cb9cbe5
commit b9ec2099cb
5 changed files with 34 additions and 2 deletions
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10
hw/i386/x86.c
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@@ -27,6 +27,7 @@
#include "qemu/units.h"
#include "qemu/datadir.h"
#include "qemu/guest-random.h"
#include "qom/object_interfaces.h"
#include "qapi/error.h"
#include "qapi/qmp/qerror.h"
#include "qapi/qapi-visit-common.h"
@@ -1188,8 +1189,15 @@ void x86_bios_rom_init(MachineState *ms, const char *default_firmware,
(bios_size % 65536) != 0) {
goto bios_error;
}
bios = g_malloc(sizeof(*bios));
memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
if (is_tdx_vm()) {
memory_region_init_ram_restricted(bios, NULL, "pc.bios", bios_size, &error_fatal);
tdx_set_tdvf_region(bios);
} else {
memory_region_init_ram(bios, NULL, "pc.bios", bios_size, &error_fatal);
}
if (sev_enabled() || is_tdx_vm()) {
/*
* The concept of a "reset" simply doesn't exist for