[PATCH v11 04/16] KVM: x86: Add X86EMUL_F_INVLPG and pass it in em_invlpg()

[Binbin Wu]

Add an emulation flag X86EMUL_F_INVLPG, which is used to identify an
instruction that does TLB invalidation without true memory access.

Only invlpg & invlpga implemented in emulator belong to this kind.
invlpga doesn't need additional information for emulation. Just pass
the flag to em_invlpg().

Linear Address Masking (LAM) and Linear Address Space Separation (LASS)
don't apply to addresses that are inputs to TLB invalidation. The flag
will be consumed to support LAM/LASS virtualization.

Signed-off-by: Binbin Wu <binbin.wu@xxxxxxxxxxxxxxx>
Tested-by: Xuelian Guo <xuelian.guo@xxxxxxxxx>
---
 arch/x86/kvm/emulate.c     | 4 +++-
 arch/x86/kvm/kvm_emulate.h | 1 +
 2 files changed, 4 insertions(+), 1 deletion(-)

diff --git a/arch/x86/kvm/emulate.c b/arch/x86/kvm/emulate.c
index 274d6e7aa0c1..f54e1a2cafa9 100644
--- a/arch/x86/kvm/emulate.c
+++ b/arch/x86/kvm/emulate.c
@@ -3441,8 +3441,10 @@ static int em_invlpg(struct x86_emulate_ctxt *ctxt)
 {
 	int rc;
 	ulong linear;
+	unsigned int max_size;
 
-	rc = linearize(ctxt, ctxt->src.addr.mem, 1, false, &linear);
+	rc = __linearize(ctxt, ctxt->src.addr.mem, &max_size, 1, ctxt->mode,
+			 &linear, X86EMUL_F_INVLPG);
 	if (rc == X86EMUL_CONTINUE)
 		ctxt->ops->invlpg(ctxt, linear);
 	/* Disable writeback. */
diff --git a/arch/x86/kvm/kvm_emulate.h b/arch/x86/kvm/kvm_emulate.h
index 5f9869018332..70f329a685fe 100644
--- a/arch/x86/kvm/kvm_emulate.h
+++ b/arch/x86/kvm/kvm_emulate.h
@@ -93,6 +93,7 @@ struct x86_instruction_info {
 #define X86EMUL_F_FETCH			BIT(1)
 #define X86EMUL_F_BRANCH		BIT(2)
 #define X86EMUL_F_IMPLICIT		BIT(3)
+#define X86EMUL_F_INVLPG		BIT(4)
 
 struct x86_emulate_ops {
 	void (*vm_bugged)(struct x86_emulate_ctxt *ctxt);
-- 
2.25.1