Messages in this thread | | | Date | Tue, 14 Feb 2023 16:45:57 +0000 | From | Daniel P. Berrangé <> | Subject | Re: [PATCH RFC 7/7] Revert "hw/i386: pass RNG seed via setup_data entry" |
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On Wed, Feb 08, 2023 at 04:12:56PM -0500, Michael S. Tsirkin wrote: > This reverts commit 67f7e426e53833a5db75b0d813e8d537b8a75bd2. > > Fixes: 67f7e426e5 ("hw/i386: pass RNG seed via setup_data entry") > Signed-off-by: Michael S. Tsirkin <mst@redhat.com> > --- > include/hw/i386/pc.h | 3 --- > include/hw/i386/x86.h | 3 +-- > hw/i386/microvm.c | 2 +- > hw/i386/pc.c | 4 ++-- > hw/i386/pc_piix.c | 2 -- > hw/i386/pc_q35.c | 2 -- > hw/i386/x86.c | 26 ++++---------------------- > 7 files changed, 8 insertions(+), 34 deletions(-)
All the patches prior to this were clean reverts. This one though does not look clean, rather it looks like reverting a combination of 3 commits
commit ffe2d2382e5f1aae1abc4081af407905ef380311 Author: Jason A. Donenfeld <Jason@zx2c4.com> Date: Wed Sep 21 11:31:34 2022 +0200
x86: re-enable rng seeding via SetupData
commit 3824e25db1a84fadc50b88dfbe27047aa2f7f85d Author: Gerd Hoffmann <kraxel@redhat.com> Date: Wed Aug 17 10:39:40 2022 +0200
x86: disable rng seeding via setup_data
commit 67f7e426e53833a5db75b0d813e8d537b8a75bd2 Author: Jason A. Donenfeld <Jason@zx2c4.com> Date: Thu Jul 21 14:56:36 2022 +0200
hw/i386: pass RNG seed via setup_data entry
though, even taking the individual commits isn't a perfectly clean revert due to other unrelated changes in machine type versioning.
I'm not too fussed if this last one isn't a clean revert, but lets just call out in the commit message that we're just manually resolving conflicts and skipping those two intermediate commits for simplicity.
Assuming an improve commit message:
Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>
> > diff --git a/include/hw/i386/pc.h b/include/hw/i386/pc.h > index 66e3d059ef..44b08554fa 100644 > --- a/include/hw/i386/pc.h > +++ b/include/hw/i386/pc.h > @@ -127,9 +127,6 @@ struct PCMachineClass { > > /* create kvmclock device even when KVM PV features are not exposed */ > bool kvmclock_create_always; > - > - /* skip passing an rng seed for legacy machines */ > - bool legacy_no_rng_seed; > }; > > #define TYPE_PC_MACHINE "generic-pc-machine" > diff --git a/include/hw/i386/x86.h b/include/hw/i386/x86.h > index 62fa5774f8..df82c5fd42 100644 > --- a/include/hw/i386/x86.h > +++ b/include/hw/i386/x86.h > @@ -126,8 +126,7 @@ void x86_bios_rom_init(MachineState *ms, const char *default_firmware, > 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 x86_machine_is_smm_enabled(const X86MachineState *x86ms); > bool x86_machine_is_acpi_enabled(const X86MachineState *x86ms); > diff --git a/hw/i386/microvm.c b/hw/i386/microvm.c > index 170a331e3f..b231ceda9a 100644 > --- a/hw/i386/microvm.c > +++ b/hw/i386/microvm.c > @@ -330,7 +330,7 @@ static void microvm_memory_init(MicrovmMachineState *mms) > rom_set_fw(fw_cfg); > > if (machine->kernel_filename != NULL) { > - x86_load_linux(x86ms, fw_cfg, 0, true, false); > + x86_load_linux(x86ms, fw_cfg, 0, true); > } > > if (mms->option_roms) { > diff --git a/hw/i386/pc.c b/hw/i386/pc.c > index 6e592bd969..2c5f675ba4 100644 > --- a/hw/i386/pc.c > +++ b/hw/i386/pc.c > @@ -804,7 +804,7 @@ void xen_load_linux(PCMachineState *pcms) > rom_set_fw(fw_cfg); > > x86_load_linux(x86ms, fw_cfg, pcmc->acpi_data_size, > - pcmc->pvh_enabled, pcmc->legacy_no_rng_seed); > + pcmc->pvh_enabled); > for (i = 0; i < nb_option_roms; i++) { > assert(!strcmp(option_rom[i].name, "linuxboot.bin") || > !strcmp(option_rom[i].name, "linuxboot_dma.bin") || > @@ -1124,7 +1124,7 @@ void pc_memory_init(PCMachineState *pcms, > > if (linux_boot) { > x86_load_linux(x86ms, fw_cfg, pcmc->acpi_data_size, > - pcmc->pvh_enabled, pcmc->legacy_no_rng_seed); > + pcmc->pvh_enabled); > } > > for (i = 0; i < nb_option_roms; i++) { > diff --git a/hw/i386/pc_piix.c b/hw/i386/pc_piix.c > index df64dd8dcc..839bd65df5 100644 > --- a/hw/i386/pc_piix.c > +++ b/hw/i386/pc_piix.c > @@ -476,9 +476,7 @@ DEFINE_I440FX_MACHINE(v7_2, "pc-i440fx-7.2", NULL, > > static void pc_i440fx_7_1_machine_options(MachineClass *m) > { > - PCMachineClass *pcmc = PC_MACHINE_CLASS(m); > pc_i440fx_7_2_machine_options(m); > - pcmc->legacy_no_rng_seed = true; > compat_props_add(m->compat_props, hw_compat_7_1, hw_compat_7_1_len); > compat_props_add(m->compat_props, pc_compat_7_1, pc_compat_7_1_len); > } > diff --git a/hw/i386/pc_q35.c b/hw/i386/pc_q35.c > index 66cd718b70..e6e3966262 100644 > --- a/hw/i386/pc_q35.c > +++ b/hw/i386/pc_q35.c > @@ -395,9 +395,7 @@ DEFINE_Q35_MACHINE(v7_2, "pc-q35-7.2", NULL, > > static void pc_q35_7_1_machine_options(MachineClass *m) > { > - PCMachineClass *pcmc = PC_MACHINE_CLASS(m); > pc_q35_7_2_machine_options(m); > - pcmc->legacy_no_rng_seed = true; > compat_props_add(m->compat_props, hw_compat_7_1, hw_compat_7_1_len); > compat_props_add(m->compat_props, pc_compat_7_1, pc_compat_7_1_len); > } > diff --git a/hw/i386/x86.c b/hw/i386/x86.c > index 4831193c86..80be3032cc 100644 > --- a/hw/i386/x86.c > +++ b/hw/i386/x86.c > @@ -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/qmp/qerror.h" > #include "qapi/qapi-visit-common.h" > @@ -771,8 +770,7 @@ 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; > @@ -780,7 +778,7 @@ 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); > @@ -790,7 +788,6 @@ 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; > @@ -1070,31 +1067,16 @@ 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 > -- > MST >
With regards, Daniel -- |: https://berrange.com -o- https://www.flickr.com/photos/dberrange :| |: https://libvirt.org -o- https://fstop138.berrange.com :| |: https://entangle-photo.org -o- https://www.instagram.com/dberrange :|
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