git: 96cede86ff9a - main - emulators/xen-kernel: fix build with clang 13.0.0
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Date: Tue, 23 Nov 2021 13:48:24 UTC
The branch main has been updated by royger (src committer):
URL: https://cgit.FreeBSD.org/ports/commit/?id=96cede86ff9afdc44069daff2fede9880f530f84
commit 96cede86ff9afdc44069daff2fede9880f530f84
Author: Roger Pau Monné <royger@FreeBSD.org>
AuthorDate: 2021-11-23 08:57:48 +0000
Commit: Roger Pau Monné <royger@FreeBSD.org>
CommitDate: 2021-11-23 13:47:47 +0000
emulators/xen-kernel: fix build with clang 13.0.0
Sponsored by: Citrix Systems R&D
Approved by: bapt (implicit)
---
emulators/xen-kernel/Makefile | 5 +-
...gnment-of-function-parameters-in-compat-m.patch | 105 +++++++++++++++++++++
2 files changed, 109 insertions(+), 1 deletion(-)
diff --git a/emulators/xen-kernel/Makefile b/emulators/xen-kernel/Makefile
index 8bd1c117fa20..bb8cdb93dab0 100644
--- a/emulators/xen-kernel/Makefile
+++ b/emulators/xen-kernel/Makefile
@@ -1,6 +1,6 @@
PORTNAME= xen
PORTVERSION= 4.15.0
-PORTREVISION= 1
+PORTREVISION= 2
CATEGORIES= emulators
MASTER_SITES= http://downloads.xenproject.org/release/xen/${PORTVERSION}/
PKGNAMESUFFIX= -kernel
@@ -28,6 +28,9 @@ EXTRA_PATCHES+= ${PATCHDIR}/0001-x86-mtrr-remove-stale-function-prototype.patch:
${PATCHDIR}/0002-x86-mtrr-move-epte_get_entry_emt-to-p2m-ept.c.patch:-p1 \
${PATCHDIR}/0003-x86-ept-force-WB-cache-attributes-for-grant-and-fore.patch:-p1
+# Fix build with clang 13.0.0
+EXTRA_PATCHES+= ${PATCHDIR}/0001-efi-fix-alignment-of-function-parameters-in-compat-m.patch:-p1
+
.include <bsd.port.options.mk>
.if ${OPSYS} != FreeBSD
diff --git a/emulators/xen-kernel/files/0001-efi-fix-alignment-of-function-parameters-in-compat-m.patch b/emulators/xen-kernel/files/0001-efi-fix-alignment-of-function-parameters-in-compat-m.patch
new file mode 100644
index 000000000000..1612c5a113a1
--- /dev/null
+++ b/emulators/xen-kernel/files/0001-efi-fix-alignment-of-function-parameters-in-compat-m.patch
@@ -0,0 +1,105 @@
+From be12fcca8b784e456df3adedbffe657d753c5ff9 Mon Sep 17 00:00:00 2001
+From: Roger Pau Monne <roger.pau@citrix.com>
+Date: Thu, 18 Nov 2021 09:28:06 +0100
+Subject: [PATCH] efi: fix alignment of function parameters in compat mode
+MIME-Version: 1.0
+Content-Type: text/plain; charset=UTF-8
+Content-Transfer-Encoding: 8bit
+
+Currently the max_store_size, remain_store_size and max_size in
+compat_pf_efi_runtime_call are 4 byte aligned, which makes clang
+13.0.0 complain with:
+
+In file included from compat.c:30:
+./runtime.c:646:13: error: passing 4-byte aligned argument to 8-byte aligned parameter 2 of 'QueryVariableInfo' may result in an unaligned pointer access [-Werror,-Walign-mismatch]
+ &op->u.query_variable_info.max_store_size,
+ ^
+./runtime.c:647:13: error: passing 4-byte aligned argument to 8-byte aligned parameter 3 of 'QueryVariableInfo' may result in an unaligned pointer access [-Werror,-Walign-mismatch]
+ &op->u.query_variable_info.remain_store_size,
+ ^
+./runtime.c:648:13: error: passing 4-byte aligned argument to 8-byte aligned parameter 4 of 'QueryVariableInfo' may result in an unaligned pointer access [-Werror,-Walign-mismatch]
+ &op->u.query_variable_info.max_size);
+ ^
+Fix this by bouncing the variables on the stack in order for them to
+be 8 byte aligned.
+
+Note this could be done in a more selective manner to only apply to
+compat code calls, but given the overhead of making an EFI call doing
+an extra copy of 3 variables doesn't seem to warrant the special
+casing.
+
+Signed-off-by: Roger Pau Monné <roger.pau@citrix.com>
+Release-Acked-by: Ian Jackson <iwj@xenproject.org>
+Reviewed-by: Ian Jackson <iwj@xenproject.org>
+Signed-off-by: Ian Jackson <iwj@xenproject.org>
+Reviewed-by: Jan Beulich <jbeulich@suse.com>
+
+---
+Changes since v3:
+ - Remove hard tabs. Apply Jan's r-b as authorised in email.
+Changes since v2:
+ - Adjust the commentary as per discussion.
+Changes since v1:
+ - Copy back the results.
+---
+ xen/common/efi/runtime.c | 31 +++++++++++++++++++++++++++----
+ 1 file changed, 27 insertions(+), 4 deletions(-)
+
+diff --git a/xen/common/efi/runtime.c b/xen/common/efi/runtime.c
+index 375b94229e..d2fdc28df3 100644
+--- a/xen/common/efi/runtime.c
++++ b/xen/common/efi/runtime.c
+@@ -607,6 +607,9 @@ int efi_runtime_call(struct xenpf_efi_runtime_call *op)
+ break;
+
+ case XEN_EFI_query_variable_info:
++ {
++ uint64_t max_store_size, remain_store_size, max_size;
++
+ if ( op->misc & ~XEN_EFI_VARINFO_BOOT_SNAPSHOT )
+ return -EINVAL;
+
+@@ -638,16 +641,36 @@ int efi_runtime_call(struct xenpf_efi_runtime_call *op)
+
+ if ( !efi_enabled(EFI_RS) || (efi_rs->Hdr.Revision >> 16) < 2 )
+ return -EOPNOTSUPP;
++
++ /*
++ * Bounce the variables onto the stack to make them 8 byte aligned when
++ * called from the compat handler, as their placement in
++ * compat_pf_efi_runtime_call will make them 4 byte aligned instead and
++ * and compilers may validly complain.
++ *
++ * Note that while the function parameters are OUT only, copy the
++ * values here anyway just in case. This is done regardless of whether
++ * called from the compat handler or not, as it's not worth the extra
++ * logic to differentiate.
++ */
++ max_store_size = op->u.query_variable_info.max_store_size;
++ remain_store_size = op->u.query_variable_info.remain_store_size;
++ max_size = op->u.query_variable_info.max_size;
++
+ state = efi_rs_enter();
+ if ( !state.cr3 )
+ return -EOPNOTSUPP;
+ status = efi_rs->QueryVariableInfo(
+- op->u.query_variable_info.attr,
+- &op->u.query_variable_info.max_store_size,
+- &op->u.query_variable_info.remain_store_size,
+- &op->u.query_variable_info.max_size);
++ op->u.query_variable_info.attr, &max_store_size, &remain_store_size,
++ &max_size);
+ efi_rs_leave(&state);
++
++ op->u.query_variable_info.max_store_size = max_store_size;
++ op->u.query_variable_info.remain_store_size = remain_store_size;
++ op->u.query_variable_info.max_size = max_size;
++
+ break;
++ }
+
+ case XEN_EFI_query_capsule_capabilities:
+ case XEN_EFI_update_capsule:
+--
+2.33.0
+