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allow shadow functions to be called from modules 

Fixes an issue where attempting to call the shadow functions from a
module results in modpost failures:

    ERROR: "kpatch_shadow_get" [net/mac80211/mac80211.ko] undefined!
    ERROR: "kpatch_shadow_alloc" [net/mac80211/mac80211.ko] undefined!

LDFLAGS_MODULE is apparently not really needed.
This commit is contained in:
Josh Poimboeuf 2014-10-01 23:12:05 -05:00
parent 629b2eaa26
commit ea445c0333
2 changed files with 27 additions and 1 deletions
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3
kpatch-build/kpatch-build
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@ -444,10 +444,11 @@ export TEMPDIR
# module gets moved to the kernel tree
CROSS_COMPILE="$TOOLSDIR/kpatch-gcc " \
LDFLAGS_vmlinux="--warn-unresolved-symbols" \
LDFLAGS_MODULE="--warn-unresolved-symbols" \
KBUILD_MODPOST_WARN=1 \
make "-j$CPUS" $TARGETS "O=$OBJDIR" >> "$LOGFILE" 2>&1 || die
[[ "${PIPESTATUS[0]}" -eq 0 ]] || die
grep -q "undefined reference" "$LOGFILE" | grep -qv kpatch_shadow && die
grep -q "undefined!" "$LOGFILE" |grep -qv kpatch_shadow && die
if [[ ! -e "$TEMPDIR/changed_objs" ]]; then
die "no changed objects found"

25
test/integration/module-shadow.patch Normal file
View File

@ -0,0 +1,25 @@
Index: src/arch/x86/kvm/vmx.c
===================================================================
--- src.orig/arch/x86/kvm/vmx.c
+++ src/arch/x86/kvm/vmx.c
@@ -8758,10 +8758,20 @@ static void vmx_leave_nested(struct kvm_
* It should only be called before L2 actually succeeded to run, and when
* vmcs01 is current (it doesn't leave_guest_mode() or switch vmcss).
*/
+#include "kpatch.h"
static void nested_vmx_entry_failure(struct kvm_vcpu *vcpu,
struct vmcs12 *vmcs12,
u32 reason, unsigned long qualification)
{
+ int *kpatch;
+
+ kpatch = kpatch_shadow_alloc(vcpu, "kpatch", sizeof(*kpatch),
+ GFP_KERNEL);
+ if (kpatch) {
+ kpatch_shadow_get(vcpu, "kpatch");
+ kpatch_shadow_free(vcpu, "kpatch");
+ }
+
load_vmcs12_host_state(vcpu, vmcs12);
vmcs12->vm_exit_reason = reason | VMX_EXIT_REASONS_FAILED_VMENTRY;
vmcs12->exit_qualification = qualification;