We can't exclude someone wanting to hide the instructions from guests.
Signed-off-by: Jan Beulich <[email protected]>
---
Looks like I can't count - I've mistakenly omitted this patch from
the overview mail, so there'll be a total of 7.
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -1306,6 +1306,7 @@ static bool vcpu_has(
#define vcpu_has_fpu() vcpu_has( 1, EDX, 0, ctxt, ops)
#define vcpu_has_cx8() vcpu_has( 1, EDX, 8, ctxt, ops)
+#define vcpu_has_sep() vcpu_has( 1, EDX, 11, ctxt, ops)
#define vcpu_has_cmov() vcpu_has( 1, EDX, 15, ctxt, ops)
#define vcpu_has_clflush() vcpu_has( 1, EDX, 19, ctxt, ops)
#define vcpu_has_mmx() vcpu_has( 1, EDX, 23, ctxt, ops)
@@ -5132,6 +5133,7 @@ x86_emulate(
uint64_t msr_content;
int lm;
+ vcpu_must_have(sep);
generate_exception_if(mode_ring0(), EXC_GP, 0);
generate_exception_if(!in_protmode(ctxt, ops), EXC_GP, 0);
@@ -5179,6 +5181,7 @@ x86_emulate(
{
uint64_t msr_content;
+ vcpu_must_have(sep);
generate_exception_if(!mode_ring0(), EXC_GP, 0);
generate_exception_if(!in_protmode(ctxt, ops), EXC_GP, 0);
x86emul: check for SYSENTER/SYSEXIT availability
We can't exclude someone wanting to hide the instructions from guests.
Signed-off-by: Jan Beulich <[email protected]>
--- a/xen/arch/x86/x86_emulate/x86_emulate.c
+++ b/xen/arch/x86/x86_emulate/x86_emulate.c
@@ -1306,6 +1306,7 @@ static bool vcpu_has(
#define vcpu_has_fpu() vcpu_has( 1, EDX, 0, ctxt, ops)
#define vcpu_has_cx8() vcpu_has( 1, EDX, 8, ctxt, ops)
+#define vcpu_has_sep() vcpu_has( 1, EDX, 11, ctxt, ops)
#define vcpu_has_cmov() vcpu_has( 1, EDX, 15, ctxt, ops)
#define vcpu_has_clflush() vcpu_has( 1, EDX, 19, ctxt, ops)
#define vcpu_has_mmx() vcpu_has( 1, EDX, 23, ctxt, ops)
@@ -5132,6 +5133,7 @@ x86_emulate(
uint64_t msr_content;
int lm;
+ vcpu_must_have(sep);
generate_exception_if(mode_ring0(), EXC_GP, 0);
generate_exception_if(!in_protmode(ctxt, ops), EXC_GP, 0);
@@ -5179,6 +5181,7 @@ x86_emulate(
{
uint64_t msr_content;
+ vcpu_must_have(sep);
generate_exception_if(!mode_ring0(), EXC_GP, 0);
generate_exception_if(!in_protmode(ctxt, ops), EXC_GP, 0);
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