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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH] x86: fix EFER handling
Introduce a per-CPU shadow of what is currently in EFER, as context switch
code must re-write this MSR so that all guests run with appropriate EFER.SCE
and EFER.NX settings. Remove EFER from the set of MSRs that VMX deals with
in a generic fashion.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxxxx>
Index: 2007-05-14/xen/arch/x86/domain.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/domain.c 2007-05-14 14:27:23.000000000
+0200
+++ 2007-05-14/xen/arch/x86/domain.c 2007-05-14 14:31:12.000000000 +0200
@@ -47,6 +47,7 @@
#endif
DEFINE_PER_CPU(struct vcpu *, curr_vcpu);
+DEFINE_PER_CPU(__u64, efer);
static void paravirt_ctxt_switch_from(struct vcpu *v);
static void paravirt_ctxt_switch_to(struct vcpu *v);
@@ -1138,21 +1139,18 @@ void context_switch(struct vcpu *prev, s
__context_switch();
#ifdef CONFIG_COMPAT
- if ( is_idle_vcpu(prev) ||
- (is_pv_32on64_domain(prev->domain) !=
- is_pv_32on64_domain(next->domain)) )
+ if ( !is_hvm_vcpu(next) &&
+ (is_idle_vcpu(prev) ||
+ is_hvm_vcpu(prev) ||
+ is_pv_32on64_vcpu(prev) != is_pv_32on64_vcpu(next)) )
{
- uint32_t efer_lo, efer_hi;
+ uint64_t efer = read_efer();
local_flush_tlb_one(GDT_VIRT_START(next) +
FIRST_RESERVED_GDT_BYTE);
- rdmsr(MSR_EFER, efer_lo, efer_hi);
- if ( !is_pv_32on64_domain(next->domain) == !(efer_lo & EFER_SCE) )
- {
- efer_lo ^= EFER_SCE;
- wrmsr(MSR_EFER, efer_lo, efer_hi);
- }
+ if ( !is_pv_32on64_vcpu(next) == !(efer & EFER_SCE) )
+ write_efer(efer ^ EFER_SCE);
}
#endif
Index: 2007-05-14/xen/arch/x86/hvm/svm/svm.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/svm/svm.c 2007-05-14 13:47:25.000000000
+0200
+++ 2007-05-14/xen/arch/x86/hvm/svm/svm.c 2007-05-14 14:28:19.000000000
+0200
@@ -96,11 +96,8 @@ static inline void svm_inject_exception(
static void stop_svm(void)
{
- u32 eax, edx;
/* We turn off the EFER_SVME bit. */
- rdmsr(MSR_EFER, eax, edx);
- eax &= ~EFER_SVME;
- wrmsr(MSR_EFER, eax, edx);
+ write_efer(read_efer() & ~EFER_SVME);
}
static void svm_store_cpu_guest_regs(
@@ -145,7 +142,13 @@ static inline int long_mode_do_msr_write
{
case MSR_EFER:
/* Offending reserved bit will cause #GP. */
- if ( msr_content & ~(EFER_LME | EFER_LMA | EFER_NX | EFER_SCE) )
+#ifdef __x86_64__
+ if ( (msr_content & ~(EFER_LME | EFER_LMA | EFER_NX | EFER_SCE)) ||
+#else
+ if ( (msr_content & ~(EFER_NX | EFER_SCE)) ||
+#endif
+ (!cpu_has_nx && (msr_content & EFER_NX)) ||
+ (!cpu_has_syscall && (msr_content & EFER_SCE)) )
{
gdprintk(XENLOG_WARNING, "Trying to set reserved bit in "
"EFER: %"PRIx64"\n", msr_content);
@@ -502,7 +505,7 @@ int svm_vmcb_restore(struct vcpu *v, str
}
-void svm_save_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
+static void svm_save_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
{
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
@@ -518,7 +521,7 @@ void svm_save_cpu_state(struct vcpu *v,
}
-void svm_load_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
+static void svm_load_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
{
struct vmcb_struct *vmcb = v->arch.hvm_svm.vmcb;
@@ -537,13 +540,13 @@ void svm_load_cpu_state(struct vcpu *v,
hvm_set_guest_time(v, data->tsc);
}
-void svm_save_vmcb_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
+static void svm_save_vmcb_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
{
svm_save_cpu_state(v, ctxt);
svm_vmcb_save(v, ctxt);
}
-int svm_load_vmcb_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
+static int svm_load_vmcb_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
{
svm_load_cpu_state(v, ctxt);
if (svm_vmcb_restore(v, ctxt)) {
@@ -871,6 +874,7 @@ static struct hvm_function_table svm_fun
.paging_enabled = svm_paging_enabled,
.long_mode_enabled = svm_long_mode_enabled,
.pae_enabled = svm_pae_enabled,
+ .nx_enabled = svm_nx_enabled,
.interrupts_enabled = svm_interrupts_enabled,
.guest_x86_mode = svm_guest_x86_mode,
.get_guest_ctrl_reg = svm_get_ctrl_reg,
@@ -927,9 +931,7 @@ int start_svm(void)
((root_vmcb[cpu] = alloc_vmcb()) == NULL) )
return 0;
- rdmsr(MSR_EFER, eax, edx);
- eax |= EFER_SVME;
- wrmsr(MSR_EFER, eax, edx);
+ write_efer(read_efer() | EFER_SVME);
svm_npt_detect();
Index: 2007-05-14/xen/arch/x86/hvm/vmx/vmcs.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/vmx/vmcs.c 2007-05-03 09:45:09.000000000
+0200
+++ 2007-05-14/xen/arch/x86/hvm/vmx/vmcs.c 2007-05-14 14:28:19.000000000
+0200
@@ -285,11 +285,6 @@ static void construct_vmcs(struct vcpu *
vmx_vmcs_enter(v);
- v->arch.hvm_vmx.cpu_cr2 = 0;
- v->arch.hvm_vmx.cpu_cr3 = 0;
- memset(&v->arch.hvm_vmx.msr_state, 0, sizeof(v->arch.hvm_vmx.msr_state));
- v->arch.hvm_vmx.vmxassist_enabled = 0;
-
/* VMCS controls. */
__vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_control);
__vmwrite(VM_EXIT_CONTROLS, vmx_vmexit_control);
Index: 2007-05-14/xen/arch/x86/hvm/vmx/vmx.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/hvm/vmx/vmx.c 2007-05-14 13:47:25.000000000
+0200
+++ 2007-05-14/xen/arch/x86/hvm/vmx/vmx.c 2007-05-14 14:28:19.000000000
+0200
@@ -89,7 +89,7 @@ static DEFINE_PER_CPU(struct vmx_msr_sta
static u32 msr_index[VMX_MSR_COUNT] =
{
MSR_LSTAR, MSR_STAR, MSR_CSTAR,
- MSR_SYSCALL_MASK, MSR_EFER,
+ MSR_SYSCALL_MASK
};
static void vmx_save_host_msrs(void)
@@ -117,8 +117,7 @@ static inline int long_mode_do_msr_read(
switch ( (u32)regs->ecx ) {
case MSR_EFER:
- HVM_DBG_LOG(DBG_LEVEL_2, "EFER msr_content 0x%"PRIx64, msr_content);
- msr_content = guest_msr_state->msrs[VMX_INDEX_MSR_EFER];
+ msr_content = v->arch.hvm_vmx.efer;
break;
case MSR_FS_BASE:
@@ -130,7 +129,7 @@ static inline int long_mode_do_msr_read(
goto check_long_mode;
case MSR_SHADOW_GS_BASE:
- msr_content = guest_msr_state->shadow_gs;
+ msr_content = v->arch.hvm_vmx.shadow_gs;
check_long_mode:
if ( !(vmx_long_mode_enabled(v)) )
{
@@ -182,7 +181,9 @@ static inline int long_mode_do_msr_write
{
case MSR_EFER:
/* offending reserved bit will cause #GP */
- if ( msr_content & ~(EFER_LME | EFER_LMA | EFER_NX | EFER_SCE) )
+ if ( (msr_content & ~(EFER_LME | EFER_LMA | EFER_NX | EFER_SCE)) ||
+ (!cpu_has_nx && (msr_content & EFER_NX)) ||
+ (!cpu_has_syscall && (msr_content & EFER_SCE)) )
{
gdprintk(XENLOG_WARNING, "Trying to set reserved bit in "
"EFER: %"PRIx64"\n", msr_content);
@@ -190,7 +191,7 @@ static inline int long_mode_do_msr_write
}
if ( (msr_content & EFER_LME)
- && !(guest_msr_state->msrs[VMX_INDEX_MSR_EFER] & EFER_LME) )
+ && !(v->arch.hvm_vmx.efer & EFER_LME) )
{
if ( unlikely(vmx_paging_enabled(v)) )
{
@@ -200,7 +201,7 @@ static inline int long_mode_do_msr_write
}
}
else if ( !(msr_content & EFER_LME)
- && (guest_msr_state->msrs[VMX_INDEX_MSR_EFER] & EFER_LME) )
+ && (v->arch.hvm_vmx.efer & EFER_LME) )
{
if ( unlikely(vmx_paging_enabled(v)) )
{
@@ -210,7 +211,11 @@ static inline int long_mode_do_msr_write
}
}
- guest_msr_state->msrs[VMX_INDEX_MSR_EFER] = msr_content;
+ if ( (msr_content ^ v->arch.hvm_vmx.efer) & (EFER_NX|EFER_SCE) )
+ write_efer((read_efer() & ~(EFER_NX|EFER_SCE)) |
+ (msr_content & (EFER_NX|EFER_SCE)));
+
+ v->arch.hvm_vmx.efer = msr_content;
break;
case MSR_FS_BASE:
@@ -228,7 +233,7 @@ static inline int long_mode_do_msr_write
__vmwrite(GUEST_GS_BASE, msr_content);
else
{
- v->arch.hvm_vmx.msr_state.shadow_gs = msr_content;
+ v->arch.hvm_vmx.shadow_gs = msr_content;
wrmsrl(MSR_SHADOW_GS_BASE, msr_content);
}
@@ -280,12 +285,14 @@ static void vmx_restore_host_msrs(void)
wrmsrl(msr_index[i], host_msr_state->msrs[i]);
clear_bit(i, &host_msr_state->flags);
}
+ if ( !(read_efer() & EFER_NX) )
+ write_efer(read_efer() | EFER_NX);
}
static void vmx_save_guest_msrs(struct vcpu *v)
{
/* MSR_SHADOW_GS_BASE may have been changed by swapgs instruction. */
- rdmsrl(MSR_SHADOW_GS_BASE, v->arch.hvm_vmx.msr_state.shadow_gs);
+ rdmsrl(MSR_SHADOW_GS_BASE, v->arch.hvm_vmx.shadow_gs);
}
static void vmx_restore_guest_msrs(struct vcpu *v)
@@ -297,11 +304,9 @@ static void vmx_restore_guest_msrs(struc
guest_msr_state = &v->arch.hvm_vmx.msr_state;
host_msr_state = &this_cpu(host_msr_state);
- wrmsrl(MSR_SHADOW_GS_BASE, guest_msr_state->shadow_gs);
+ wrmsrl(MSR_SHADOW_GS_BASE, v->arch.hvm_vmx.shadow_gs);
guest_flags = guest_msr_state->flags;
- if ( !guest_flags )
- return;
while ( guest_flags ) {
i = find_first_set_bit(guest_flags);
@@ -313,23 +318,90 @@ static void vmx_restore_guest_msrs(struc
wrmsrl(msr_index[i], guest_msr_state->msrs[i]);
clear_bit(i, &guest_flags);
}
+
+ if ( (v->arch.hvm_vmx.efer ^ read_efer()) & (EFER_NX|EFER_SCE) )
+ {
+ HVM_DBG_LOG(DBG_LEVEL_2,
+ "restore guest's EFER with value %lx",
+ v->arch.hvm_vmx.efer);
+ write_efer((read_efer() & ~(EFER_NX|EFER_SCE)) |
+ (v->arch.hvm_vmx.efer & (EFER_NX|EFER_SCE)));
+ }
}
#else /* __i386__ */
#define vmx_save_host_msrs() ((void)0)
-#define vmx_restore_host_msrs() ((void)0)
+
+static void vmx_restore_host_msrs(void)
+{
+ if ( !(read_efer() & EFER_NX) )
+ write_efer(read_efer() | EFER_NX);
+}
+
#define vmx_save_guest_msrs(v) ((void)0)
-#define vmx_restore_guest_msrs(v) ((void)0)
+
+static void vmx_restore_guest_msrs(struct vcpu *v)
+{
+ if ( (v->arch.hvm_vmx.efer ^ read_efer()) & EFER_NX )
+ {
+ HVM_DBG_LOG(DBG_LEVEL_2,
+ "restore guest's EFER with value %lx",
+ v->arch.hvm_vmx.efer);
+ write_efer((read_efer() & ~EFER_NX) |
+ (v->arch.hvm_vmx.efer & EFER_NX));
+ }
+}
static inline int long_mode_do_msr_read(struct cpu_user_regs *regs)
{
- return 0;
+ u64 msr_content = 0;
+ struct vcpu *v = current;
+
+ switch ( regs->ecx ) {
+ case MSR_EFER:
+ msr_content = v->arch.hvm_vmx.efer;
+ break;
+
+ default:
+ return 0;
+ }
+
+ regs->eax = msr_content >> 0;
+ regs->edx = msr_content >> 32;
+
+ return 1;
}
static inline int long_mode_do_msr_write(struct cpu_user_regs *regs)
{
- return 0;
+ u64 msr_content = regs->eax | ((u64)regs->edx << 32);
+ struct vcpu *v = current;
+
+ switch ( regs->ecx )
+ {
+ case MSR_EFER:
+ /* offending reserved bit will cause #GP */
+ if ( (msr_content & ~EFER_NX) ||
+ (!cpu_has_nx && (msr_content & EFER_NX)) )
+ {
+ gdprintk(XENLOG_WARNING, "Trying to set reserved bit in "
+ "EFER: %"PRIx64"\n", msr_content);
+ vmx_inject_hw_exception(v, TRAP_gp_fault, 0);
+ return 0;
+ }
+
+ if ( (msr_content ^ v->arch.hvm_vmx.efer) & EFER_NX )
+ write_efer((read_efer() & ~EFER_NX) | (msr_content & EFER_NX));
+
+ v->arch.hvm_vmx.efer = msr_content;
+ break;
+
+ default:
+ return 0;
+ }
+
+ return 1;
}
#endif /* __i386__ */
@@ -637,7 +709,7 @@ int vmx_vmcs_restore(struct vcpu *v, str
return -EINVAL;
}
-#ifdef HVM_DEBUG_SUSPEND
+#if defined(__x86_64__) && defined(HVM_DEBUG_SUSPEND)
static void dump_msr_state(struct vmx_msr_state *m)
{
int i = 0;
@@ -648,17 +720,16 @@ static void dump_msr_state(struct vmx_ms
printk("\n");
}
#else
-static void dump_msr_state(struct vmx_msr_state *m)
-{
-}
+#define dump_msr_state(m) ((void)0)
#endif
-void vmx_save_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
+static void vmx_save_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
{
+#ifdef __x86_64__
struct vmx_msr_state *guest_state = &v->arch.hvm_vmx.msr_state;
unsigned long guest_flags = guest_state->flags;
- data->shadow_gs = guest_state->shadow_gs;
+ data->shadow_gs = v->arch.hvm_vmx.shadow_gs;
/* save msrs */
data->msr_flags = guest_flags;
@@ -666,15 +737,18 @@ void vmx_save_cpu_state(struct vcpu *v,
data->msr_star = guest_state->msrs[VMX_INDEX_MSR_STAR];
data->msr_cstar = guest_state->msrs[VMX_INDEX_MSR_CSTAR];
data->msr_syscall_mask = guest_state->msrs[VMX_INDEX_MSR_SYSCALL_MASK];
- data->msr_efer = guest_state->msrs[VMX_INDEX_MSR_EFER];
+#endif
+
+ data->msr_efer = v->arch.hvm_vmx.efer;
data->tsc = hvm_get_guest_time(v);
dump_msr_state(guest_state);
}
-void vmx_load_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
+static void vmx_load_cpu_state(struct vcpu *v, struct hvm_hw_cpu *data)
{
+#ifdef __x86_64__
struct vmx_msr_state *guest_state = &v->arch.hvm_vmx.msr_state;
/* restore msrs */
@@ -683,9 +757,11 @@ void vmx_load_cpu_state(struct vcpu *v,
guest_state->msrs[VMX_INDEX_MSR_STAR] = data->msr_star;
guest_state->msrs[VMX_INDEX_MSR_CSTAR] = data->msr_cstar;
guest_state->msrs[VMX_INDEX_MSR_SYSCALL_MASK] = data->msr_syscall_mask;
- guest_state->msrs[VMX_INDEX_MSR_EFER] = data->msr_efer;
- guest_state->shadow_gs = data->shadow_gs;
+ v->arch.hvm_vmx.shadow_gs = data->shadow_gs;
+#endif
+
+ v->arch.hvm_vmx.efer = data->msr_efer;
v->arch.hvm_vmx.vmxassist_enabled = !(data->cr0 & X86_CR0_PE);
@@ -695,7 +771,7 @@ void vmx_load_cpu_state(struct vcpu *v,
}
-void vmx_save_vmcs_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
+static void vmx_save_vmcs_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
{
vmx_save_cpu_state(v, ctxt);
vmx_vmcs_enter(v);
@@ -703,7 +779,7 @@ void vmx_save_vmcs_ctxt(struct vcpu *v,
vmx_vmcs_exit(v);
}
-int vmx_load_vmcs_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
+static int vmx_load_vmcs_ctxt(struct vcpu *v, struct hvm_hw_cpu *ctxt)
{
vmx_load_cpu_state(v, ctxt);
if (vmx_vmcs_restore(v, ctxt)) {
@@ -1017,6 +1093,11 @@ static int vmx_pae_enabled(struct vcpu *
return (vmx_paging_enabled(v) && (cr4 & X86_CR4_PAE));
}
+static int vmx_nx_enabled(struct vcpu *v)
+{
+ return v->arch.hvm_vmx.efer & EFER_NX;
+}
+
static int vmx_interrupts_enabled(struct vcpu *v)
{
unsigned long eflags = __vmread(GUEST_RFLAGS);
@@ -1097,6 +1178,7 @@ static struct hvm_function_table vmx_fun
.paging_enabled = vmx_paging_enabled,
.long_mode_enabled = vmx_long_mode_enabled,
.pae_enabled = vmx_pae_enabled,
+ .nx_enabled = vmx_nx_enabled,
.interrupts_enabled = vmx_interrupts_enabled,
.guest_x86_mode = vmx_guest_x86_mode,
.get_guest_ctrl_reg = vmx_get_ctrl_reg,
@@ -1997,8 +2079,7 @@ static int vmx_set_cr0(unsigned long val
else
{
HVM_DBG_LOG(DBG_LEVEL_1, "Enabling long mode\n");
- v->arch.hvm_vmx.msr_state.msrs[VMX_INDEX_MSR_EFER]
- |= EFER_LMA;
+ v->arch.hvm_vmx.efer |= EFER_LMA;
vm_entry_value = __vmread(VM_ENTRY_CONTROLS);
vm_entry_value |= VM_ENTRY_IA32E_MODE;
__vmwrite(VM_ENTRY_CONTROLS, vm_entry_value);
@@ -2047,8 +2128,7 @@ static int vmx_set_cr0(unsigned long val
*/
if ( vmx_long_mode_enabled(v) )
{
- v->arch.hvm_vmx.msr_state.msrs[VMX_INDEX_MSR_EFER]
- &= ~EFER_LMA;
+ v->arch.hvm_vmx.efer &= ~EFER_LMA;
vm_entry_value = __vmread(VM_ENTRY_CONTROLS);
vm_entry_value &= ~VM_ENTRY_IA32E_MODE;
__vmwrite(VM_ENTRY_CONTROLS, vm_entry_value);
@@ -2080,7 +2160,7 @@ static int vmx_set_cr0(unsigned long val
{
if ( vmx_long_mode_enabled(v) )
{
- v->arch.hvm_vmx.msr_state.msrs[VMX_INDEX_MSR_EFER] &= ~EFER_LMA;
+ v->arch.hvm_vmx.efer &= ~EFER_LMA;
vm_entry_value = __vmread(VM_ENTRY_CONTROLS);
vm_entry_value &= ~VM_ENTRY_IA32E_MODE;
__vmwrite(VM_ENTRY_CONTROLS, vm_entry_value);
Index: 2007-05-14/xen/arch/x86/mm/shadow/multi.c
===================================================================
--- 2007-05-14.orig/xen/arch/x86/mm/shadow/multi.c 2007-05-03
09:45:09.000000000 +0200
+++ 2007-05-14/xen/arch/x86/mm/shadow/multi.c 2007-05-14 14:28:19.000000000
+0200
@@ -181,11 +181,11 @@ guest_supports_superpages(struct vcpu *v
static inline int
guest_supports_nx(struct vcpu *v)
{
+ if ( GUEST_PAGING_LEVELS == 2 || !cpu_has_nx )
+ return 0;
if ( !is_hvm_vcpu(v) )
- return cpu_has_nx;
-
- // XXX - fix this!
- return 1;
+ return 1;
+ return hvm_nx_enabled(v);
}
Index: 2007-05-14/xen/include/asm-x86/cpufeature.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/cpufeature.h 2007-04-23
10:01:46.000000000 +0200
+++ 2007-05-14/xen/include/asm-x86/cpufeature.h 2007-05-14 14:28:19.000000000
+0200
@@ -114,6 +114,7 @@
#define cpu_has_xmm2 boot_cpu_has(X86_FEATURE_XMM2)
#define cpu_has_xmm3 boot_cpu_has(X86_FEATURE_XMM3)
#define cpu_has_ht boot_cpu_has(X86_FEATURE_HT)
+#define cpu_has_syscall boot_cpu_has(X86_FEATURE_SYSCALL)
#define cpu_has_mp boot_cpu_has(X86_FEATURE_MP)
#define cpu_has_nx boot_cpu_has(X86_FEATURE_NX)
#define cpu_has_k6_mtrr boot_cpu_has(X86_FEATURE_K6_MTRR)
@@ -136,6 +137,7 @@
#define cpu_has_xmm2 1
#define cpu_has_xmm3 boot_cpu_has(X86_FEATURE_XMM3)
#define cpu_has_ht boot_cpu_has(X86_FEATURE_HT)
+#define cpu_has_syscall 1
#define cpu_has_mp 1
#define cpu_has_nx boot_cpu_has(X86_FEATURE_NX)
#define cpu_has_k6_mtrr 0
Index: 2007-05-14/xen/include/asm-x86/hvm/hvm.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/hvm/hvm.h 2007-04-23
10:01:46.000000000 +0200
+++ 2007-05-14/xen/include/asm-x86/hvm/hvm.h 2007-05-14 14:28:19.000000000
+0200
@@ -93,14 +93,17 @@ struct hvm_function_table {
* 1) determine whether paging is enabled,
* 2) determine whether long mode is enabled,
* 3) determine whether PAE paging is enabled,
- * 4) determine whether interrupts are enabled or not,
- * 5) determine the mode the guest is running in,
- * 6) return the current guest control-register value
- * 7) return the current guest segment descriptor base
+ * 4) determine whether NX is enabled,
+ * 5) determine whether interrupts are enabled or not,
+ * 6) determine the mode the guest is running in,
+ * 7) return the current guest control-register value
+ * 8) return the current guest segment descriptor base
+ * 9) return the current guest segment descriptor
*/
int (*paging_enabled)(struct vcpu *v);
int (*long_mode_enabled)(struct vcpu *v);
int (*pae_enabled)(struct vcpu *v);
+ int (*nx_enabled)(struct vcpu *v);
int (*interrupts_enabled)(struct vcpu *v);
int (*guest_x86_mode)(struct vcpu *v);
unsigned long (*get_guest_ctrl_reg)(struct vcpu *v, unsigned int num);
@@ -199,6 +202,12 @@ hvm_interrupts_enabled(struct vcpu *v)
}
static inline int
+hvm_nx_enabled(struct vcpu *v)
+{
+ return hvm_funcs.nx_enabled(v);
+}
+
+static inline int
hvm_guest_x86_mode(struct vcpu *v)
{
return hvm_funcs.guest_x86_mode(v);
Index: 2007-05-14/xen/include/asm-x86/hvm/svm/svm.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/hvm/svm/svm.h 2007-04-23
10:01:46.000000000 +0200
+++ 2007-05-14/xen/include/asm-x86/hvm/svm/svm.h 2007-05-14
14:28:19.000000000 +0200
@@ -62,6 +62,11 @@ static inline int svm_pae_enabled(struct
return svm_paging_enabled(v) && (guest_cr4 & X86_CR4_PAE);
}
+static inline int svm_nx_enabled(struct vcpu *v)
+{
+ return v->arch.hvm_svm.cpu_shadow_efer & EFER_NX;
+}
+
static inline int svm_pgbit_test(struct vcpu *v)
{
return v->arch.hvm_svm.cpu_shadow_cr0 & X86_CR0_PG;
Index: 2007-05-14/xen/include/asm-x86/hvm/vmx/vmcs.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/hvm/vmx/vmcs.h 2007-05-03
09:45:09.000000000 +0200
+++ 2007-05-14/xen/include/asm-x86/hvm/vmx/vmcs.h 2007-05-14
14:28:19.000000000 +0200
@@ -39,7 +39,6 @@ enum {
VMX_INDEX_MSR_STAR,
VMX_INDEX_MSR_CSTAR,
VMX_INDEX_MSR_SYSCALL_MASK,
- VMX_INDEX_MSR_EFER,
VMX_MSR_COUNT
};
@@ -47,7 +46,6 @@ enum {
struct vmx_msr_state {
unsigned long flags;
unsigned long msrs[VMX_MSR_COUNT];
- unsigned long shadow_gs;
};
struct arch_vmx_struct {
@@ -76,7 +74,11 @@ struct arch_vmx_struct {
unsigned long cpu_shadow_cr4; /* copy of guest read shadow CR4 */
unsigned long cpu_cr2; /* save CR2 */
unsigned long cpu_cr3;
+#ifdef __x86_64__
struct vmx_msr_state msr_state;
+ unsigned long shadow_gs;
+#endif
+ unsigned long efer;
unsigned long vmxassist_enabled:1;
};
Index: 2007-05-14/xen/include/asm-x86/hvm/vmx/vmx.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/hvm/vmx/vmx.h 2007-04-23
10:01:46.000000000 +0200
+++ 2007-05-14/xen/include/asm-x86/hvm/vmx/vmx.h 2007-05-14
14:28:19.000000000 +0200
@@ -261,14 +261,12 @@ static inline int vmx_paging_enabled(str
static inline int vmx_long_mode_enabled(struct vcpu *v)
{
- u64 efer = v->arch.hvm_vmx.msr_state.msrs[VMX_INDEX_MSR_EFER];
- return efer & EFER_LMA;
+ return v->arch.hvm_vmx.efer & EFER_LMA;
}
static inline int vmx_lme_is_set(struct vcpu *v)
{
- u64 efer = v->arch.hvm_vmx.msr_state.msrs[VMX_INDEX_MSR_EFER];
- return efer & EFER_LME;
+ return v->arch.hvm_vmx.efer & EFER_LME;
}
static inline int vmx_pgbit_test(struct vcpu *v)
Index: 2007-05-14/xen/include/asm-x86/msr.h
===================================================================
--- 2007-05-14.orig/xen/include/asm-x86/msr.h 2007-04-23 10:01:46.000000000
+0200
+++ 2007-05-14/xen/include/asm-x86/msr.h 2007-05-14 14:28:19.000000000
+0200
@@ -3,6 +3,9 @@
#ifndef __ASSEMBLY__
+#include <xen/smp.h>
+#include <xen/percpu.h>
+
#define rdmsr(msr,val1,val2) \
__asm__ __volatile__("rdmsr" \
: "=a" (val1), "=d" (val2) \
@@ -142,6 +145,25 @@ static inline void wrmsrl(unsigned int m
#define EFER_NX (1<<_EFER_NX)
#define EFER_SVME (1<<_EFER_SVME)
+#ifndef __ASSEMBLY__
+
+DECLARE_PER_CPU(__u64, efer);
+
+static inline __u64 read_efer(void)
+{
+ if (!this_cpu(efer))
+ rdmsrl(MSR_EFER, this_cpu(efer));
+ return this_cpu(efer);
+}
+
+static inline void write_efer(__u64 val)
+{
+ this_cpu(efer) = val;
+ wrmsrl(MSR_EFER, val);
+}
+
+#endif
+
/* Intel MSRs. Some also available on other CPUs */
#define MSR_IA32_PLATFORM_ID 0x17
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