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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [XEN] Simplify VMCS allocation (never bigger than a page).
# HG changeset patch
# User kfraser@xxxxxxxxxxxxxxxxxxxxx
# Node ID 0f9908c2c5c75d787d70a13b01506d1dca49290a
# Parent f5fd563bcc84f5bb67ceb1031c127ce44515507a
[XEN] Simplify VMCS allocation (never bigger than a page).
Dynamically determine reserved bits in execution-control
fields.
Signed-off-by: Keir Fraser <keir@xxxxxxxxxxxxx>
---
xen/arch/x86/hvm/vmx/vmcs.c | 135 +++++++++++++++++++++++++++++--------
xen/arch/x86/hvm/vmx/vmx.c | 47 +-----------
xen/include/asm-x86/hvm/vmx/vmcs.h | 15 ++--
xen/include/asm-x86/hvm/vmx/vmx.h | 67 ------------------
4 files changed, 124 insertions(+), 140 deletions(-)
diff -r f5fd563bcc84 -r 0f9908c2c5c7 xen/arch/x86/hvm/vmx/vmcs.c
--- a/xen/arch/x86/hvm/vmx/vmcs.c Mon Sep 25 17:45:28 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmcs.c Mon Sep 25 17:46:08 2006 +0100
@@ -37,36 +37,119 @@
#include <xen/keyhandler.h>
#include <asm/shadow.h>
-static int vmcs_size;
-static int vmcs_order;
+/* Basic flags for Pin-based VM-execution controls. */
+#define MONITOR_PIN_BASED_EXEC_CONTROLS \
+ ( PIN_BASED_EXT_INTR_MASK | \
+ PIN_BASED_NMI_EXITING )
+
+/* Basic flags for CPU-based VM-execution controls. */
+#ifdef __x86_64__
+#define MONITOR_CPU_BASED_EXEC_CONTROLS_SUBARCH \
+ ( CPU_BASED_CR8_LOAD_EXITING | \
+ CPU_BASED_CR8_STORE_EXITING )
+#else
+#define MONITOR_CPU_BASED_EXEC_CONTROLS_SUBARCH 0
+#endif
+#define MONITOR_CPU_BASED_EXEC_CONTROLS \
+ ( MONITOR_CPU_BASED_EXEC_CONTROLS_SUBARCH | \
+ CPU_BASED_HLT_EXITING | \
+ CPU_BASED_INVDPG_EXITING | \
+ CPU_BASED_MWAIT_EXITING | \
+ CPU_BASED_MOV_DR_EXITING | \
+ CPU_BASED_ACTIVATE_IO_BITMAP | \
+ CPU_BASED_USE_TSC_OFFSETING )
+
+/* Basic flags for VM-Exit controls. */
+#ifdef __x86_64__
+#define MONITOR_VM_EXIT_CONTROLS_SUBARCH VM_EXIT_IA32E_MODE
+#else
+#define MONITOR_VM_EXIT_CONTROLS_SUBARCH 0
+#endif
+#define MONITOR_VM_EXIT_CONTROLS \
+ ( MONITOR_VM_EXIT_CONTROLS_SUBARCH | \
+ VM_EXIT_ACK_INTR_ON_EXIT )
+
+/* Basic flags for VM-Entry controls. */
+#define MONITOR_VM_ENTRY_CONTROLS 0x00000000
+
+/* Dynamic (run-time adjusted) execution control flags. */
+static u32 vmx_pin_based_exec_control;
+static u32 vmx_cpu_based_exec_control;
+static u32 vmx_vmexit_control;
+static u32 vmx_vmentry_control;
+
static u32 vmcs_revision_id;
+static u32 adjust_vmx_controls(u32 ctrls, u32 msr)
+{
+ u32 vmx_msr_low, vmx_msr_high;
+
+ rdmsr(msr, vmx_msr_low, vmx_msr_high);
+
+ /* Bit == 0 means must be zero. */
+ BUG_ON(ctrls & ~vmx_msr_high);
+
+ /* Bit == 1 means must be one. */
+ ctrls |= vmx_msr_low;
+
+ return ctrls;
+}
+
void vmx_init_vmcs_config(void)
{
u32 vmx_msr_low, vmx_msr_high;
-
- if ( vmcs_size )
- return;
+ u32 _vmx_pin_based_exec_control;
+ u32 _vmx_cpu_based_exec_control;
+ u32 _vmx_vmexit_control;
+ u32 _vmx_vmentry_control;
+
+ _vmx_pin_based_exec_control =
+ adjust_vmx_controls(MONITOR_PIN_BASED_EXEC_CONTROLS,
+ MSR_IA32_VMX_PINBASED_CTLS_MSR);
+ _vmx_cpu_based_exec_control =
+ adjust_vmx_controls(MONITOR_CPU_BASED_EXEC_CONTROLS,
+ MSR_IA32_VMX_PROCBASED_CTLS_MSR);
+ _vmx_vmexit_control =
+ adjust_vmx_controls(MONITOR_VM_EXIT_CONTROLS,
+ MSR_IA32_VMX_EXIT_CTLS_MSR);
+ _vmx_vmentry_control =
+ adjust_vmx_controls(MONITOR_VM_ENTRY_CONTROLS,
+ MSR_IA32_VMX_ENTRY_CTLS_MSR);
rdmsr(MSR_IA32_VMX_BASIC_MSR, vmx_msr_low, vmx_msr_high);
- vmcs_revision_id = vmx_msr_low;
-
- vmcs_size = vmx_msr_high & 0x1fff;
- vmcs_order = get_order_from_bytes(vmcs_size);
+ if ( smp_processor_id() == 0 )
+ {
+ vmcs_revision_id = vmx_msr_low;
+ vmx_pin_based_exec_control = _vmx_pin_based_exec_control;
+ vmx_cpu_based_exec_control = _vmx_cpu_based_exec_control;
+ vmx_vmexit_control = _vmx_vmexit_control;
+ vmx_vmentry_control = _vmx_vmentry_control;
+ }
+ else
+ {
+ BUG_ON(vmcs_revision_id != vmx_msr_low);
+ BUG_ON(vmx_pin_based_exec_control != _vmx_pin_based_exec_control);
+ BUG_ON(vmx_cpu_based_exec_control != _vmx_cpu_based_exec_control);
+ BUG_ON(vmx_vmexit_control != _vmx_vmexit_control);
+ BUG_ON(vmx_vmentry_control != _vmx_vmentry_control);
+ }
+
+ /* IA-32 SDM Vol 3B: VMCS size is never greater than 4kB. */
+ BUG_ON((vmx_msr_high & 0x1fff) > PAGE_SIZE);
}
static struct vmcs_struct *vmx_alloc_vmcs(void)
{
struct vmcs_struct *vmcs;
- if ( (vmcs = alloc_xenheap_pages(vmcs_order)) == NULL )
+ if ( (vmcs = alloc_xenheap_page()) == NULL )
{
DPRINTK("Failed to allocate VMCS.\n");
return NULL;
}
- memset(vmcs, 0, vmcs_size); /* don't remove this */
+ memset(vmcs, 0, PAGE_SIZE);
vmcs->vmcs_revision_id = vmcs_revision_id;
return vmcs;
@@ -74,7 +157,7 @@ static struct vmcs_struct *vmx_alloc_vmc
static void vmx_free_vmcs(struct vmcs_struct *vmcs)
{
- free_xenheap_pages(vmcs, vmcs_order);
+ free_xenheap_page(vmcs);
}
static void __vmx_clear_vmcs(void *info)
@@ -156,12 +239,11 @@ static inline int construct_vmcs_control
{
int error = 0;
- error |= __vmwrite(PIN_BASED_VM_EXEC_CONTROL,
- MONITOR_PIN_BASED_EXEC_CONTROLS);
-
- error |= __vmwrite(VM_EXIT_CONTROLS, MONITOR_VM_EXIT_CONTROLS);
-
- error |= __vmwrite(VM_ENTRY_CONTROLS, MONITOR_VM_ENTRY_CONTROLS);
+ error |= __vmwrite(PIN_BASED_VM_EXEC_CONTROL, vmx_pin_based_exec_control);
+
+ error |= __vmwrite(VM_EXIT_CONTROLS, vmx_vmexit_control);
+
+ error |= __vmwrite(VM_ENTRY_CONTROLS, vmx_vmentry_control);
error |= __vmwrite(IO_BITMAP_A, virt_to_maddr(arch_vmx->io_bitmap_a));
error |= __vmwrite(IO_BITMAP_B, virt_to_maddr(arch_vmx->io_bitmap_b));
@@ -246,9 +328,8 @@ static void vmx_do_launch(struct vcpu *v
error |= __vmwrite(GUEST_CR0, cr0);
cr0 &= ~X86_CR0_PG;
error |= __vmwrite(CR0_READ_SHADOW, cr0);
- error |= __vmwrite(CPU_BASED_VM_EXEC_CONTROL,
- MONITOR_CPU_BASED_EXEC_CONTROLS);
- v->arch.hvm_vcpu.u.vmx.exec_control = MONITOR_CPU_BASED_EXEC_CONTROLS;
+ error |= __vmwrite(CPU_BASED_VM_EXEC_CONTROL, vmx_cpu_based_exec_control);
+ v->arch.hvm_vcpu.u.vmx.exec_control = vmx_cpu_based_exec_control;
__asm__ __volatile__ ("mov %%cr4,%0" : "=r" (cr4) : );
@@ -297,21 +378,21 @@ static inline int construct_init_vmcs_gu
/* MSR */
error |= __vmwrite(VM_EXIT_MSR_LOAD_ADDR, 0);
error |= __vmwrite(VM_EXIT_MSR_STORE_ADDR, 0);
-
error |= __vmwrite(VM_EXIT_MSR_STORE_COUNT, 0);
error |= __vmwrite(VM_EXIT_MSR_LOAD_COUNT, 0);
error |= __vmwrite(VM_ENTRY_MSR_LOAD_COUNT, 0);
- /* interrupt */
+
error |= __vmwrite(VM_ENTRY_INTR_INFO_FIELD, 0);
- /* mask */
- error |= __vmwrite(CR0_GUEST_HOST_MASK, -1UL);
- error |= __vmwrite(CR4_GUEST_HOST_MASK, -1UL);
+
+ error |= __vmwrite(CR0_GUEST_HOST_MASK, ~0UL);
+ error |= __vmwrite(CR4_GUEST_HOST_MASK, ~0UL);
error |= __vmwrite(PAGE_FAULT_ERROR_CODE_MASK, 0);
error |= __vmwrite(PAGE_FAULT_ERROR_CODE_MATCH, 0);
- /* TSC */
error |= __vmwrite(CR3_TARGET_COUNT, 0);
+
+ error |= __vmwrite(GUEST_ACTIVITY_STATE, 0);
/* Guest Selectors */
error |= __vmwrite(GUEST_ES_SELECTOR, GUEST_LAUNCH_DS);
diff -r f5fd563bcc84 -r 0f9908c2c5c7 xen/arch/x86/hvm/vmx/vmx.c
--- a/xen/arch/x86/hvm/vmx/vmx.c Mon Sep 25 17:45:28 2006 +0100
+++ b/xen/arch/x86/hvm/vmx/vmx.c Mon Sep 25 17:46:08 2006 +0100
@@ -684,21 +684,6 @@ static void vmx_init_ap_context(struct v
void do_nmi(struct cpu_user_regs *);
-static int check_vmx_controls(u32 ctrls, u32 msr)
-{
- u32 vmx_msr_low, vmx_msr_high;
-
- rdmsr(msr, vmx_msr_low, vmx_msr_high);
- if ( (ctrls < vmx_msr_low) || (ctrls > vmx_msr_high) )
- {
- printk("Insufficient VMX capability 0x%x, "
- "msr=0x%x,low=0x%8x,high=0x%x\n",
- ctrls, msr, vmx_msr_low, vmx_msr_high);
- return 0;
- }
- return 1;
-}
-
static void vmx_init_hypercall_page(struct domain *d, void *hypercall_page)
{
char *p;
@@ -791,7 +776,7 @@ int start_vmx(void)
*/
boot_cpu_data.x86_capability[4] = cpuid_ecx(1);
- if (!(test_bit(X86_FEATURE_VMXE, &boot_cpu_data.x86_capability)))
+ if ( !test_bit(X86_FEATURE_VMXE, &boot_cpu_data.x86_capability) )
return 0;
rdmsr(IA32_FEATURE_CONTROL_MSR, eax, edx);
@@ -811,24 +796,11 @@ int start_vmx(void)
IA32_FEATURE_CONTROL_MSR_ENABLE_VMXON, 0);
}
- if ( !check_vmx_controls(MONITOR_PIN_BASED_EXEC_CONTROLS,
- MSR_IA32_VMX_PINBASED_CTLS_MSR) )
- return 0;
- if ( !check_vmx_controls(MONITOR_CPU_BASED_EXEC_CONTROLS,
- MSR_IA32_VMX_PROCBASED_CTLS_MSR) )
- return 0;
- if ( !check_vmx_controls(MONITOR_VM_EXIT_CONTROLS,
- MSR_IA32_VMX_EXIT_CTLS_MSR) )
- return 0;
- if ( !check_vmx_controls(MONITOR_VM_ENTRY_CONTROLS,
- MSR_IA32_VMX_ENTRY_CTLS_MSR) )
- return 0;
-
set_in_cr4(X86_CR4_VMXE);
vmx_init_vmcs_config();
-
- if(!smp_processor_id())
+
+ if ( smp_processor_id() == 0 )
setup_vmcs_dump();
if ( (vmcs = vmx_alloc_host_vmcs()) == NULL )
@@ -1519,7 +1491,7 @@ static int vmx_set_cr0(unsigned long val
&v->arch.hvm_vmx.cpu_state);
__vmread(VM_ENTRY_CONTROLS, &vm_entry_value);
- vm_entry_value |= VM_ENTRY_CONTROLS_IA32E_MODE;
+ vm_entry_value |= VM_ENTRY_IA32E_MODE;
__vmwrite(VM_ENTRY_CONTROLS, vm_entry_value);
}
#endif
@@ -1573,7 +1545,7 @@ static int vmx_set_cr0(unsigned long val
clear_bit(VMX_CPU_STATE_LMA_ENABLED,
&v->arch.hvm_vmx.cpu_state);
__vmread(VM_ENTRY_CONTROLS, &vm_entry_value);
- vm_entry_value &= ~VM_ENTRY_CONTROLS_IA32E_MODE;
+ vm_entry_value &= ~VM_ENTRY_IA32E_MODE;
__vmwrite(VM_ENTRY_CONTROLS, vm_entry_value);
}
}
@@ -2296,15 +2268,8 @@ asmlinkage void vmx_vmexit_handler(struc
domain_crash_synchronous();
break;
case EXIT_REASON_PENDING_INTERRUPT:
- /*
- * Not sure exactly what the purpose of this is. The only bits set
- * and cleared at this point are CPU_BASED_VIRTUAL_INTR_PENDING.
- * (in io.c:{enable,disable}_irq_window(). So presumably we want to
- * set it to the original value...
- */
+ /* Disable the interrupt window. */
v->arch.hvm_vcpu.u.vmx.exec_control &= ~CPU_BASED_VIRTUAL_INTR_PENDING;
- v->arch.hvm_vcpu.u.vmx.exec_control |=
- (MONITOR_CPU_BASED_EXEC_CONTROLS & CPU_BASED_VIRTUAL_INTR_PENDING);
__vmwrite(CPU_BASED_VM_EXEC_CONTROL,
v->arch.hvm_vcpu.u.vmx.exec_control);
break;
diff -r f5fd563bcc84 -r 0f9908c2c5c7 xen/include/asm-x86/hvm/vmx/vmcs.h
--- a/xen/include/asm-x86/hvm/vmx/vmcs.h Mon Sep 25 17:45:28 2006 +0100
+++ b/xen/include/asm-x86/hvm/vmx/vmcs.h Mon Sep 25 17:46:08 2006 +0100
@@ -132,12 +132,16 @@ extern int vmcs_version;
#define CPU_BASED_ACTIVATE_IO_BITMAP 0x02000000
#define CPU_BASED_MONITOR_EXITING 0x20000000
#define CPU_BASED_PAUSE_EXITING 0x40000000
-#define PIN_BASED_EXT_INTR_MASK 0x1
-#define PIN_BASED_NMI_EXITING 0x8
-
+
+#define PIN_BASED_EXT_INTR_MASK 0x00000001
+#define PIN_BASED_NMI_EXITING 0x00000008
+
+#define VM_EXIT_IA32E_MODE 0x00000200
#define VM_EXIT_ACK_INTR_ON_EXIT 0x00008000
-#define VM_EXIT_HOST_ADD_SPACE_SIZE 0x00000200
-
+
+#define VM_ENTRY_IA32E_MODE 0x00000200
+#define VM_ENTRY_SMM 0x00000400
+#define VM_ENTRY_DEACT_DUAL_MONITOR 0x00000800
/* VMCS Encordings */
enum vmcs_field {
@@ -217,6 +221,7 @@ enum vmcs_field {
GUEST_LDTR_AR_BYTES = 0x00004820,
GUEST_TR_AR_BYTES = 0x00004822,
GUEST_INTERRUPTIBILITY_INFO = 0x00004824,
+ GUEST_ACTIVITY_STATE = 0x00004826,
GUEST_SYSENTER_CS = 0x0000482A,
HOST_IA32_SYSENTER_CS = 0x00004c00,
CR0_GUEST_HOST_MASK = 0x00006000,
diff -r f5fd563bcc84 -r 0f9908c2c5c7 xen/include/asm-x86/hvm/vmx/vmx.h
--- a/xen/include/asm-x86/hvm/vmx/vmx.h Mon Sep 25 17:45:28 2006 +0100
+++ b/xen/include/asm-x86/hvm/vmx/vmx.h Mon Sep 25 17:46:08 2006 +0100
@@ -35,73 +35,6 @@ extern void set_guest_time(struct vcpu *
extern void set_guest_time(struct vcpu *v, u64 gtime);
extern unsigned int cpu_rev;
-
-/*
- * Need fill bits for SENTER
- */
-
-#define MONITOR_PIN_BASED_EXEC_CONTROLS_RESERVED_VALUE 0x00000016
-
-#define MONITOR_PIN_BASED_EXEC_CONTROLS \
- ( \
- MONITOR_PIN_BASED_EXEC_CONTROLS_RESERVED_VALUE | \
- PIN_BASED_EXT_INTR_MASK | \
- PIN_BASED_NMI_EXITING \
- )
-
-#define MONITOR_CPU_BASED_EXEC_CONTROLS_RESERVED_VALUE 0x0401e172
-
-#define _MONITOR_CPU_BASED_EXEC_CONTROLS \
- ( \
- MONITOR_CPU_BASED_EXEC_CONTROLS_RESERVED_VALUE | \
- CPU_BASED_HLT_EXITING | \
- CPU_BASED_INVDPG_EXITING | \
- CPU_BASED_MWAIT_EXITING | \
- CPU_BASED_MOV_DR_EXITING | \
- CPU_BASED_ACTIVATE_IO_BITMAP | \
- CPU_BASED_USE_TSC_OFFSETING \
- )
-
-#define MONITOR_CPU_BASED_EXEC_CONTROLS_IA32E_MODE \
- ( \
- CPU_BASED_CR8_LOAD_EXITING | \
- CPU_BASED_CR8_STORE_EXITING \
- )
-
-#define MONITOR_VM_EXIT_CONTROLS_RESERVED_VALUE 0x0003edff
-
-#define MONITOR_VM_EXIT_CONTROLS_IA32E_MODE 0x00000200
-
-#define _MONITOR_VM_EXIT_CONTROLS \
- ( \
- MONITOR_VM_EXIT_CONTROLS_RESERVED_VALUE | \
- VM_EXIT_ACK_INTR_ON_EXIT \
- )
-
-#if defined (__x86_64__)
-#define MONITOR_CPU_BASED_EXEC_CONTROLS \
- ( \
- _MONITOR_CPU_BASED_EXEC_CONTROLS | \
- MONITOR_CPU_BASED_EXEC_CONTROLS_IA32E_MODE \
- )
-#define MONITOR_VM_EXIT_CONTROLS \
- ( \
- _MONITOR_VM_EXIT_CONTROLS | \
- MONITOR_VM_EXIT_CONTROLS_IA32E_MODE \
- )
-#else
-#define MONITOR_CPU_BASED_EXEC_CONTROLS \
- _MONITOR_CPU_BASED_EXEC_CONTROLS
-
-#define MONITOR_VM_EXIT_CONTROLS \
- _MONITOR_VM_EXIT_CONTROLS
-#endif
-
-#define VM_ENTRY_CONTROLS_RESERVED_VALUE 0x000011ff
-#define VM_ENTRY_CONTROLS_IA32E_MODE 0x00000200
-
-#define MONITOR_VM_ENTRY_CONTROLS \
- VM_ENTRY_CONTROLS_RESERVED_VALUE
/*
* Exit Reasons
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