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Revert "hw/i386: pass RNG seed via setup_data entry"

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This reverts commit 67f7e426e5.

Additionally to the automatic revert, I went over the code
and dropped all mentions of legacy_no_rng_seed manually,
effectively reverting a combination of 2 additional commits:

    commit ffe2d2382e
    Author: Jason A. Donenfeld <Jason@zx2c4.com>
    Date:   Wed Sep 21 11:31:34 2022 +0200

        x86: re-enable rng seeding via SetupData

    commit 3824e25db1
    Author: Gerd Hoffmann <kraxel@redhat.com>
    Date:   Wed Aug 17 10:39:40 2022 +0200

        x86: disable rng seeding via setup_data

Fixes: 67f7e426e5 ("hw/i386: pass RNG seed via setup_data entry")
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Tested-by: Nathan Chancellor <nathan@kernel.org>
Tested-by: Dov Murik <dovmurik@linux.ibm.com>
Reviewed-by: Michael S. Tsirkin <mst@redhat.com>
Signed-off-by: Michael S. Tsirkin <mst@redhat.com>
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
This commit is contained in:
Michael S. Tsirkin 2023-02-08 16:05:35 -05:00
parent ae80d81cfa
commit 167f487358
7 changed files with 8 additions and 34 deletions
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26
hw/i386/x86.c
View file

@ -26,7 +26,6 @@
#include "qemu/cutils.h"
#include "qemu/units.h"
#include "qemu/datadir.h"
#include "qemu/guest-random.h"
#include "qapi/error.h"
#include "qapi/qapi-visit-common.h"
#include "qapi/clone-visitor.h"
@ -772,8 +771,7 @@ static bool load_elfboot(const char *kernel_filename,
void x86_load_linux(X86MachineState *x86ms,
FWCfgState *fw_cfg,
int acpi_data_size,
bool pvh_enabled,
bool legacy_no_rng_seed)
bool pvh_enabled)
{
bool linuxboot_dma_enabled = X86_MACHINE_GET_CLASS(x86ms)->fwcfg_dma_enabled;
uint16_t protocol;
@ -781,7 +779,7 @@ void x86_load_linux(X86MachineState *x86ms,
int dtb_size, setup_data_offset;
uint32_t initrd_max;
uint8_t header[8192], *setup, *kernel;
hwaddr real_addr, prot_addr, cmdline_addr, initrd_addr = 0, first_setup_data = 0;
hwaddr real_addr, prot_addr, cmdline_addr, initrd_addr = 0;
FILE *f;
char *vmode;
MachineState *machine = MACHINE(x86ms);
@ -791,7 +789,6 @@ void x86_load_linux(X86MachineState *x86ms,
const char *dtb_filename = machine->dtb;
const char *kernel_cmdline = machine->kernel_cmdline;
SevKernelLoaderContext sev_load_ctx = {};
enum { RNG_SEED_LENGTH = 32 };
/* Align to 16 bytes as a paranoia measure */
cmdline_size = (strlen(kernel_cmdline) + 16) & ~15;
@ -1071,31 +1068,16 @@ void x86_load_linux(X86MachineState *x86ms,
kernel_size = setup_data_offset + sizeof(struct setup_data) + dtb_size;
kernel = g_realloc(kernel, kernel_size);
stq_p(header + 0x250, prot_addr + setup_data_offset);
setup_data = (struct setup_data *)(kernel + setup_data_offset);
setup_data->next = cpu_to_le64(first_setup_data);
first_setup_data = prot_addr + setup_data_offset;
setup_data->next = 0;
setup_data->type = cpu_to_le32(SETUP_DTB);
setup_data->len = cpu_to_le32(dtb_size);
load_image_size(dtb_filename, setup_data->data, dtb_size);
}
if (!legacy_no_rng_seed) {
setup_data_offset = QEMU_ALIGN_UP(kernel_size, 16);
kernel_size = setup_data_offset + sizeof(struct setup_data) + RNG_SEED_LENGTH;
kernel = g_realloc(kernel, kernel_size);
setup_data = (struct setup_data *)(kernel + setup_data_offset);
setup_data->next = cpu_to_le64(first_setup_data);
first_setup_data = prot_addr + setup_data_offset;
setup_data->type = cpu_to_le32(SETUP_RNG_SEED);
setup_data->len = cpu_to_le32(RNG_SEED_LENGTH);
qemu_guest_getrandom_nofail(setup_data->data, RNG_SEED_LENGTH);
}
/* Offset 0x250 is a pointer to the first setup_data link. */
stq_p(header + 0x250, first_setup_data);
/*
* If we're starting an encrypted VM, it will be OVMF based, which uses the
* efi stub for booting and doesn't require any values to be placed in the