diff options
Diffstat (limited to 'gitlab/issues_text/target_missing/host_missing/accel_missing/1142')
| -rw-r--r-- | gitlab/issues_text/target_missing/host_missing/accel_missing/1142 | 46 |
1 files changed, 0 insertions, 46 deletions
diff --git a/gitlab/issues_text/target_missing/host_missing/accel_missing/1142 b/gitlab/issues_text/target_missing/host_missing/accel_missing/1142 deleted file mode 100644 index a4b690029..000000000 --- a/gitlab/issues_text/target_missing/host_missing/accel_missing/1142 +++ /dev/null @@ -1,46 +0,0 @@ -Measurements fail with direct kernel boot for AMD SEV confidential virtualization with 7.1 machine type -Description of problem: -When booting the QEMU with the 'kernel-hashes:true' property set for 'sev-guest' confidential virtualization, the contents of the `-kernel` file are measured by the firmware. - -A remote tenant can then validate the measurement against its expected contents to see if the boot was trustworthy. - -With the pc-q35-7.1 machine type the measurement always fails to validate against expected state. - -Making the following code change - -``` -diff --git a/hw/i386/pc.c b/hw/i386/pc.c -index 7280c02ce3..3a4bf5cba3 100644 ---- a/hw/i386/pc.c -+++ b/hw/i386/pc.c -@@ -1899,6 +1899,8 @@ static void pc_machine_class_init(ObjectClass *oc, void *data) - pcmc->rsdp_in_ram = true; - pcmc->smbios_defaults = true; - pcmc->smbios_uuid_encoded = true; -+ pcmc->legacy_no_rng_seed = true; -+ - pcmc->gigabyte_align = true; - pcmc->has_reserved_memory = true; - pcmc->kvmclock_enabled = true; -``` - -results in successfully validating the measurement. - -THis is not surprising, the RNG seed patch introduced in - -``` -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 -``` - -intentionally modifies the contents of the kernel image before passing it to the firmware, to inject a random seed. This will ensure the boot measuremnts are different every time. - -This RNG seed functionality must NOT be used when AMD SEV is active. -Steps to reproduce: -1. Create an AMD SEV guest with kernel-hashes=true and pc-q35-7.1 machine type -2. Attempt to validate the boot measurement -Additional information: - |