74 lines
2.4 KiB
Diff
74 lines
2.4 KiB
Diff
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Index: xen-3.2.1-testing/xen/arch/x86/hvm/hvm.c
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===================================================================
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--- xen-3.2.1-testing.orig/xen/arch/x86/hvm/hvm.c
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+++ xen-3.2.1-testing/xen/arch/x86/hvm/hvm.c
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@@ -595,10 +595,11 @@ int hvm_set_efer(uint64_t value)
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value &= ~EFER_LMA;
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- if ( (value & ~(EFER_FFXSE | EFER_LME | EFER_NX | EFER_SCE)) ||
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+ if ( (value & ~(EFER_FFXSE | EFER_LMSLE | EFER_LME | EFER_NX | EFER_SCE)) ||
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((sizeof(long) != 8) && (value & EFER_LME)) ||
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(!cpu_has_nx && (value & EFER_NX)) ||
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(!cpu_has_syscall && (value & EFER_SCE)) ||
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+ (!cpu_has_lmsl && (value & EFER_LMSLE)) ||
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(!cpu_has_ffxsr && (value & EFER_FFXSE)) )
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{
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gdprintk(XENLOG_WARNING, "Trying to set reserved bit in "
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Index: xen-3.2.1-testing/xen/arch/x86/hvm/svm/svm.c
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===================================================================
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--- xen-3.2.1-testing.orig/xen/arch/x86/hvm/svm/svm.c
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+++ xen-3.2.1-testing/xen/arch/x86/hvm/svm/svm.c
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@@ -53,6 +53,11 @@
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u32 svm_feature_flags;
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+#ifdef __x86_64__
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+/* indicate whether guest may use EFER.LMSLE */
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+unsigned char cpu_has_lmsl = 0;
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+#endif
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+
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#define set_segment_register(name, value) \
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asm volatile ( "movw %%ax ,%%" STR(name) "" : : "a" (value) )
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@@ -923,6 +928,22 @@ int start_svm(struct cpuinfo_x86 *c)
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/* Initialize core's ASID handling. */
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svm_asid_init(c);
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+#ifdef __x86_64__
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+ /*
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+ * Check whether EFER.LMSLE can be written.
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+ * Unfortunately there's no feature bit defined for this.
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+ */
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+ eax = read_efer();
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+ edx = read_efer() >> 32;
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+ if ( wrmsr_safe(MSR_EFER, eax | EFER_LMSLE, edx) == 0 )
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+ rdmsr(MSR_EFER, eax, edx);
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+ if ( eax & EFER_LMSLE )
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+ {
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+ cpu_has_lmsl = 1;
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+ wrmsr(MSR_EFER, eax ^ EFER_LMSLE, edx);
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+ }
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+#endif
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+
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if ( cpu != 0 )
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return 1;
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Index: xen-3.2.1-testing/xen/include/asm-x86/hvm/hvm.h
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===================================================================
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--- xen-3.2.1-testing.orig/xen/include/asm-x86/hvm/hvm.h
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+++ xen-3.2.1-testing/xen/include/asm-x86/hvm/hvm.h
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@@ -127,6 +127,12 @@ struct hvm_function_table {
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extern struct hvm_function_table hvm_funcs;
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extern int hvm_enabled;
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+#ifdef __i386__
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+# define cpu_has_lmsl 0
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+#else
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+extern unsigned char cpu_has_lmsl;
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+#endif
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+
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int hvm_domain_initialise(struct domain *d);
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void hvm_domain_relinquish_resources(struct domain *d);
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void hvm_domain_destroy(struct domain *d);
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