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KVM guest: Make pv trampoline code executable

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Our PV guest patching code assembles chunks of instructions on the fly when it
encounters more complicated instructions to hijack. These instructions need
to live in a section that we don't mark as non-executable, as otherwise we
fault when jumping there.

Right now we put it into the .bss section where it automatically gets marked
as non-executable. Add a check to the NX setting function to ensure that we
leave these particular pages executable.

Signed-off-by: Alexander Graf <agraf@suse.de>
This commit is contained in:
Alexander Graf
2014-04-29 12:17:26 +02:00
parent ab78475c76
commit b18db0b808
3 changed files with 16 additions and 1 deletions
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2
arch/powerpc/kernel/kvm.c
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@@ -74,7 +74,7 @@
#define KVM_INST_MTSRIN 0x7c0001e4
static bool kvm_patching_worked = true;
static char kvm_tmp[1024 * 1024];
char kvm_tmp[1024 * 1024];
static int kvm_tmp_index;
static inline void kvm_patch_ins(u32 *inst, u32 new_inst)