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Subject[tip: x86/core] x86/ibt,kvm: Add ENDBR to fastops
The following commit has been merged into the x86/core branch of tip:

Commit-ID: 6649fa876da4c505548b8e8945a6fc48e62e427c
Gitweb: https://git.kernel.org/tip/6649fa876da4c505548b8e8945a6fc48e62e427c
Author: Peter Zijlstra <peterz@infradead.org>
AuthorDate: Tue, 08 Mar 2022 16:30:28 +01:00
Committer: Peter Zijlstra <peterz@infradead.org>
CommitterDate: Tue, 15 Mar 2022 10:32:37 +01:00

x86/ibt,kvm: Add ENDBR to fastops

Signed-off-by: Peter Zijlstra (Intel) <peterz@infradead.org>
Acked-by: Josh Poimboeuf <jpoimboe@redhat.com>
Link: https://lore.kernel.org/r/20220308154318.168850084@infradead.org
---
arch/x86/kvm/emulate.c | 6 ++++--
1 file changed, 4 insertions(+), 2 deletions(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 5719d8c..08c4e9c 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -189,7 +189,7 @@
#define X16(x...) X8(x), X8(x)

#define NR_FASTOP (ilog2(sizeof(ulong)) + 1)
-#define FASTOP_SIZE 8
+#define FASTOP_SIZE (8 * (1 + HAS_KERNEL_IBT))

struct opcode {
u64 flags;
@@ -311,7 +311,8 @@ static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop);
#define __FOP_FUNC(name) \
".align " __stringify(FASTOP_SIZE) " \n\t" \
".type " name ", @function \n\t" \
- name ":\n\t"
+ name ":\n\t" \
+ ASM_ENDBR

#define FOP_FUNC(name) \
__FOP_FUNC(#name)
@@ -433,6 +434,7 @@ static int fastop(struct x86_emulate_ctxt *ctxt, fastop_t fop);
".align 4 \n\t" \
".type " #op ", @function \n\t" \
#op ": \n\t" \
+ ASM_ENDBR \
#op " %al \n\t" \
__FOP_RET(#op)

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