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ppc64le: CAS improvements, prefix detection, and vTPM support

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Signed-off-by: Robbie Harwood <rharwood@redhat.com>
This commit is contained in:
Robbie Harwood 2022-05-04 18:00:02 +00:00
parent ac52d21d8a
commit d15d46b0e4
5 changed files with 424 additions and 1 deletions
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110
0215-powerpc-do-CAS-in-a-more-compatible-way.patch Normal file
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@ -0,0 +1,110 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Fri, 8 Apr 2022 12:35:28 +1000
Subject: [PATCH] powerpc: do CAS in a more compatible way
I wrongly assumed that the most compatible way to perform CAS
negotiation was to only set the minimum number of vectors required
to ask for more memory. It turns out that this messes up booting
if the minimum VP capacity would be less than the default 10% in
vector 4.
Linux configures the minimum capacity to be 1%, so copy it for that
and for vector 3 which we now need to specify as well.
Signed-off-by: Daniel Axtens <dja@axtens.net>
---
grub-core/kern/ieee1275/init.c | 54 ++++++++++++++++++++++++------------------
1 file changed, 31 insertions(+), 23 deletions(-)
diff --git a/grub-core/kern/ieee1275/init.c b/grub-core/kern/ieee1275/init.c
index 9704715c83..ef55107467 100644
--- a/grub-core/kern/ieee1275/init.c
+++ b/grub-core/kern/ieee1275/init.c
@@ -298,33 +298,37 @@ grub_ieee1275_total_mem (grub_uint64_t *total)
/* Based on linux - arch/powerpc/kernel/prom_init.c */
struct option_vector2 {
- grub_uint8_t byte1;
- grub_uint16_t reserved;
- grub_uint32_t real_base;
- grub_uint32_t real_size;
- grub_uint32_t virt_base;
- grub_uint32_t virt_size;
- grub_uint32_t load_base;
- grub_uint32_t min_rma;
- grub_uint32_t min_load;
- grub_uint8_t min_rma_percent;
- grub_uint8_t max_pft_size;
+ grub_uint8_t byte1;
+ grub_uint16_t reserved;
+ grub_uint32_t real_base;
+ grub_uint32_t real_size;
+ grub_uint32_t virt_base;
+ grub_uint32_t virt_size;
+ grub_uint32_t load_base;
+ grub_uint32_t min_rma;
+ grub_uint32_t min_load;
+ grub_uint8_t min_rma_percent;
+ grub_uint8_t max_pft_size;
} __attribute__((packed));
struct pvr_entry {
- grub_uint32_t mask;
- grub_uint32_t entry;
+ grub_uint32_t mask;
+ grub_uint32_t entry;
};
struct cas_vector {
- struct {
- struct pvr_entry terminal;
- } pvr_list;
- grub_uint8_t num_vecs;
- grub_uint8_t vec1_size;
- grub_uint8_t vec1;
- grub_uint8_t vec2_size;
- struct option_vector2 vec2;
+ struct {
+ struct pvr_entry terminal;
+ } pvr_list;
+ grub_uint8_t num_vecs;
+ grub_uint8_t vec1_size;
+ grub_uint8_t vec1;
+ grub_uint8_t vec2_size;
+ struct option_vector2 vec2;
+ grub_uint8_t vec3_size;
+ grub_uint16_t vec3;
+ grub_uint8_t vec4_size;
+ grub_uint16_t vec4;
} __attribute__((packed));
/* Call ibm,client-architecture-support to try to get more RMA.
@@ -345,13 +349,17 @@ grub_ieee1275_ibm_cas (void)
} args;
struct cas_vector vector = {
.pvr_list = { { 0x00000000, 0xffffffff } }, /* any processor */
- .num_vecs = 2 - 1,
+ .num_vecs = 4 - 1,
.vec1_size = 0,
.vec1 = 0x80, /* ignore */
.vec2_size = 1 + sizeof(struct option_vector2) - 2,
.vec2 = {
0, 0, -1, -1, -1, -1, -1, 512, -1, 0, 48
},
+ .vec3_size = 2 - 1,
+ .vec3 = 0x00e0, // ask for FP + VMX + DFP but don't halt if unsatisfied
+ .vec4_size = 2 - 1,
+ .vec4 = 0x0001, // set required minimum capacity % to the lowest value
};
INIT_IEEE1275_COMMON (&args.common, "call-method", 3, 2);
@@ -364,7 +372,7 @@ grub_ieee1275_ibm_cas (void)
args.ihandle = root;
args.cas_addr = (grub_ieee1275_cell_t)&vector;
- grub_printf("Calling ibm,client-architecture-support...");
+ grub_printf("Calling ibm,client-architecture-support from grub...");
IEEE1275_CALL_ENTRY_FN (&args);
grub_printf("done\n");

71
0216-powerpc-prefix-detection-support-device-names-with-c.patch Normal file
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@ -0,0 +1,71 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Daniel Axtens <dja@axtens.net>
Date: Thu, 24 Mar 2022 14:34:32 +1100
Subject: [PATCH] powerpc: prefix detection: support device names with commas
Frustratingly, the device name itself can contain an embedded comma:
e.g /pci@800000020000015/pci1014,034A@0/sas/disk@5000c50098a0ee8b
So my previous approach was wrong: we cannot rely upon the presence
of a comma to say that a partition has been specified!
It turns out for prefixes like (,gpt2)/grub2 we really want to make
up a full (device,partition)/patch prefix, because root discovery code
in 10_linux will reset the root variable and use search to fill it again.
If you have run grub-install, you probably don't have search built in,
and if you don't have prefix containing (device,partition), grub will
construct ($root)$prefix/powerpc-ieee1275/search.mod - but because $root
has just been changed, this will no longer work, and the boot will fail!
Retain the gist of the logic, but instead of looking for a comma, look for
a leading '('. This matches the earlier code better anyway.
There's certainly a better fix to be had. But any time you chose to build
with a bare prefix like '/grub2', you're almost certainly going to build in
search anyway, so this will do.
Signed-off-by: Daniel Axtens <dja@axtens.net>
---
grub-core/kern/main.c | 27 +++++++++++++++++++++------
1 file changed, 21 insertions(+), 6 deletions(-)
diff --git a/grub-core/kern/main.c b/grub-core/kern/main.c
index 993b8a8598..e94a2f78fb 100644
--- a/grub-core/kern/main.c
+++ b/grub-core/kern/main.c
@@ -242,14 +242,29 @@ grub_set_prefix_and_root (void)
what sorts of paths represent disks with partition tables and those
without partition tables.
- So we act unless there is a comma in the device, which would indicate
- a partition has already been specified.
+ - Frustratingly, the device name itself can contain an embedded comma:
+ /pci@800000020000015/pci1014,034A@0/sas/disk@5000c50098a0ee8b
+ So we cannot even rely upon the presence of a comma to say that a
+ partition has been specified!
- (If we only have a path, the code in normal to discover config files
- will try both without partitions and then with any partitions so we
- will cover both CDs and HDs.)
+ If we only have a path in $prefix, the code in normal to discover
+ config files will try all disks, both without partitions and then with
+ any partitions so we will cover both CDs and HDs.
+
+ However, it doesn't then set the prefix to be something like
+ (discovered partition)/path, and so it is fragile against runtime
+ changes to $root. For example some of the stuff done in 10_linux to
+ reload $root sets root differently and then uses search to find it
+ again. If the search module is not built in, when we change root, grub
+ will look in (new root)/path/powerpc-ieee1275, that won't work, and we
+ will not be able to load the search module and the boot will fail.
+
+ This is particularly likely to hit us in the grub-install
+ (,msdos2)/grub2 case, so we act unless the supplied prefix starts with
+ '(', which would likely indicate a partition has already been
+ specified.
*/
- if (grub_strchr (device, ',') == NULL)
+ if (prefix && prefix[0] != '(')
grub_env_set ("prefix", path);
else
#endif

236
0217-ibmvtpm-Add-support-for-trusted-boot-using-a-vTPM-2..patch Normal file
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@ -0,0 +1,236 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Stefan Berger <stefanb@linux.ibm.com>
Date: Sun, 15 Mar 2020 12:37:10 -0400
Subject: [PATCH] ibmvtpm: Add support for trusted boot using a vTPM 2.0
Add support for trusted boot using a vTPM 2.0 on the IBM IEEE1275
PowerPC platform. With this patch grub now measures text and binary data
into the TPM's PCRs 8 and 9 in the same way as the x86_64 platform
does.
This patch requires Daniel Axtens's patches for claiming more memory.
For vTPM support to work on PowerVM, system driver levels 1010.30
or 1020.00 are required.
Note: Previous versions of firmware levels with the 2hash-ext-log
API call have a bug that, once this API call is invoked, has the
effect of disabling the vTPM driver under Linux causing an error
message to be displayed in the Linux kernel log. Those users will
have to update their machines to the firmware levels mentioned
above.
Cc: Eric Snowberg <eric.snowberg@oracle.com>
Signed-off-by: Stefan Berger <stefanb@linux.ibm.com>
---
grub-core/Makefile.core.def | 7 ++
grub-core/commands/ieee1275/ibmvtpm.c | 152 ++++++++++++++++++++++++++++++++++
include/grub/ieee1275/ieee1275.h | 3 +
docs/grub.texi | 3 +-
4 files changed, 164 insertions(+), 1 deletion(-)
create mode 100644 grub-core/commands/ieee1275/ibmvtpm.c
diff --git a/grub-core/Makefile.core.def b/grub-core/Makefile.core.def
index 3c0ac3b7bd..2c1608bca4 100644
--- a/grub-core/Makefile.core.def
+++ b/grub-core/Makefile.core.def
@@ -1175,6 +1175,13 @@ module = {
enable = powerpc_ieee1275;
};
+module = {
+ name = tpm;
+ common = commands/tpm.c;
+ ieee1275 = commands/ieee1275/ibmvtpm.c;
+ enable = powerpc_ieee1275;
+};
+
module = {
name = terminal;
common = commands/terminal.c;
diff --git a/grub-core/commands/ieee1275/ibmvtpm.c b/grub-core/commands/ieee1275/ibmvtpm.c
new file mode 100644
index 0000000000..e68b8448bc
--- /dev/null
+++ b/grub-core/commands/ieee1275/ibmvtpm.c
@@ -0,0 +1,152 @@
+/*
+ * GRUB -- GRand Unified Bootloader
+ * Copyright (C) 2021 Free Software Foundation, Inc.
+ * Copyright (C) 2021 IBM Corporation
+ *
+ * GRUB is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU General Public License as published by
+ * the Free Software Foundation, either version 3 of the License, or
+ * (at your option) any later version.
+ *
+ * GRUB is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with GRUB. If not, see <http://www.gnu.org/licenses/>.
+ *
+ * IBM vTPM support code.
+ */
+
+#include <grub/err.h>
+#include <grub/types.h>
+#include <grub/tpm.h>
+#include <grub/ieee1275/ieee1275.h>
+#include <grub/mm.h>
+#include <grub/misc.h>
+
+static grub_ieee1275_ihandle_t tpm_ihandle;
+static grub_uint8_t tpm_version;
+
+#define IEEE1275_IHANDLE_INVALID ((grub_ieee1275_ihandle_t)0)
+
+static void
+tpm_get_tpm_version (void)
+{
+ grub_ieee1275_phandle_t vtpm;
+ char buffer[20];
+
+ if (!grub_ieee1275_finddevice ("/vdevice/vtpm", &vtpm) &&
+ !grub_ieee1275_get_property (vtpm, "compatible", buffer,
+ sizeof (buffer), NULL) &&
+ !grub_strcmp (buffer, "IBM,vtpm20"))
+ tpm_version = 2;
+}
+
+static grub_err_t
+tpm_init (void)
+{
+ static int init_success = 0;
+
+ if (!init_success)
+ {
+ if (grub_ieee1275_open ("/vdevice/vtpm", &tpm_ihandle) < 0) {
+ tpm_ihandle = IEEE1275_IHANDLE_INVALID;
+ return GRUB_ERR_UNKNOWN_DEVICE;
+ }
+
+ init_success = 1;
+
+ tpm_get_tpm_version ();
+ }
+
+ return GRUB_ERR_NONE;
+}
+
+static int
+ibmvtpm_2hash_ext_log (grub_uint8_t pcrindex,
+ grub_uint32_t eventtype,
+ const char *description,
+ grub_size_t description_size,
+ void *buf, grub_size_t size)
+{
+ struct tpm_2hash_ext_log
+ {
+ struct grub_ieee1275_common_hdr common;
+ grub_ieee1275_cell_t method;
+ grub_ieee1275_cell_t ihandle;
+ grub_ieee1275_cell_t size;
+ grub_ieee1275_cell_t buf;
+ grub_ieee1275_cell_t description_size;
+ grub_ieee1275_cell_t description;
+ grub_ieee1275_cell_t eventtype;
+ grub_ieee1275_cell_t pcrindex;
+ grub_ieee1275_cell_t catch_result;
+ grub_ieee1275_cell_t rc;
+ }
+ args;
+
+ INIT_IEEE1275_COMMON (&args.common, "call-method", 8, 2);
+ args.method = (grub_ieee1275_cell_t) "2hash-ext-log";
+ args.ihandle = tpm_ihandle;
+ args.pcrindex = pcrindex;
+ args.eventtype = eventtype;
+ args.description = (grub_ieee1275_cell_t) description;
+ args.description_size = description_size;
+ args.buf = (grub_ieee1275_cell_t) buf;
+ args.size = (grub_ieee1275_cell_t) size;
+
+ if (IEEE1275_CALL_ENTRY_FN (&args) == -1)
+ return -1;
+
+ /*
+ * catch_result is set if firmware does not support 2hash-ext-log
+ * rc is GRUB_IEEE1275_CELL_FALSE (0) on failure
+ */
+ if ((args.catch_result) || args.rc == GRUB_IEEE1275_CELL_FALSE)
+ return -1;
+
+ return 0;
+}
+
+static grub_err_t
+tpm2_log_event (unsigned char *buf,
+ grub_size_t size, grub_uint8_t pcr,
+ const char *description)
+{
+ static int error_displayed = 0;
+ int err;
+
+ err = ibmvtpm_2hash_ext_log (pcr, EV_IPL,
+ description,
+ grub_strlen(description) + 1,
+ buf, size);
+ if (err && !error_displayed)
+ {
+ error_displayed++;
+ return grub_error (GRUB_ERR_BAD_DEVICE,
+ "2HASH-EXT-LOG failed: Firmware is likely too old.\n");
+ }
+
+ return GRUB_ERR_NONE;
+}
+
+grub_err_t
+grub_tpm_measure (unsigned char *buf, grub_size_t size, grub_uint8_t pcr,
+ const char *description)
+{
+ grub_err_t err = tpm_init();
+
+ /* Absence of a TPM isn't a failure. */
+ if (err != GRUB_ERR_NONE)
+ return GRUB_ERR_NONE;
+
+ grub_dprintf ("tpm", "log_event, pcr = %d, size = 0x%" PRIxGRUB_SIZE ", %s\n",
+ pcr, size, description);
+
+ if (tpm_version == 2)
+ return tpm2_log_event (buf, size, pcr, description);
+
+ return GRUB_ERR_NONE;
+}
diff --git a/include/grub/ieee1275/ieee1275.h b/include/grub/ieee1275/ieee1275.h
index e0a6c2ce1e..f4c85265fe 100644
--- a/include/grub/ieee1275/ieee1275.h
+++ b/include/grub/ieee1275/ieee1275.h
@@ -24,6 +24,9 @@
#include <grub/types.h>
#include <grub/machine/ieee1275.h>
+#define GRUB_IEEE1275_CELL_FALSE ((grub_ieee1275_cell_t) 0)
+#define GRUB_IEEE1275_CELL_TRUE ((grub_ieee1275_cell_t) -1)
+
struct grub_ieee1275_mem_region
{
unsigned int start;
diff --git a/docs/grub.texi b/docs/grub.texi
index a4da9c2a1b..c433240f34 100644
--- a/docs/grub.texi
+++ b/docs/grub.texi
@@ -6221,7 +6221,8 @@ tpm module is loaded. As such it is recommended that the tpm module be built
into @file{core.img} in order to avoid a potential gap in measurement between
@file{core.img} being loaded and the tpm module being loaded.
-Measured boot is currently only supported on EFI platforms.
+Measured boot is currently only supported on EFI and IBM IEEE1275 PowerPC
+platforms.
@node Lockdown
@section Lockdown when booting on a secure setup

3
grub.patches
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@ -212,3 +212,6 @@ Patch0211: 0211-grub-core-loader-i386-efi-linux.c-do-not-validate-ke.patch
Patch0212: 0212-grub-core-loader-arm64-linux.c-do-not-validate-kerne.patch
Patch0213: 0213-grub-core-loader-efi-chainloader.c-do-not-validate-c.patch
Patch0214: 0214-grub-core-loader-efi-linux.c-drop-now-unused-grub_li.patch
Patch0215: 0215-powerpc-do-CAS-in-a-more-compatible-way.patch
Patch0216: 0216-powerpc-prefix-detection-support-device-names-with-c.patch
Patch0217: 0217-ibmvtpm-Add-support-for-trusted-boot-using-a-vTPM-2..patch

5
grub2.spec
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@ -17,7 +17,7 @@
Name: grub2
Epoch: 1
Version: 2.06
Release: 38%{?dist}
Release: 39%{?dist}
Summary: Bootloader with support for Linux, Multiboot and more
License: GPLv3+
URL: http://www.gnu.org/software/grub/
@ -530,6 +530,9 @@ mv ${EFI_HOME}/grub.cfg.stb ${EFI_HOME}/grub.cfg
%endif
%changelog
* Wed May 04 2022 Robbie Harwood <rharwood@redhat.com> - 1:2.06-39
- ppc64le: CAS improvements, prefix detection, and vTPM support
* Tue Apr 19 2022 Dominik Mierzejewski <dominik@greysector.net> - 1:2.06-38
- fix "grub2-mkrescue: error: `mformat` invocation failed"