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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 4/9] x86/HVM: move NOFLUSH handling out of hvm_set_cr3()
The bit is meaningful only for MOV-to-CR3 insns, not anywhere else, in
particular not when loading nested guest state.
Signed-off-by: Jan Beulich <jbeulich@xxxxxxxx>
--- a/xen/arch/x86/hvm/emulate.c
+++ b/xen/arch/x86/hvm/emulate.c
@@ -2072,6 +2072,8 @@ static int hvmemul_write_cr(
HVMTRACE_LONG_2D(CR_WRITE, reg, TRC_PAR_LONG(val));
switch ( reg )
{
+ bool noflush;
+
case 0:
rc = hvm_set_cr0(val, true);
break;
@@ -2082,7 +2084,10 @@ static int hvmemul_write_cr(
break;
case 3:
- rc = hvm_set_cr3(val, true);
+ noflush = hvm_pcid_enabled(current) && (val & X86_CR3_NOFLUSH);
+ if ( noflush )
+ val &= ~X86_CR3_NOFLUSH;
+ rc = hvm_set_cr3(val, noflush, true);
break;
case 4:
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -2053,12 +2053,17 @@ int hvm_mov_to_cr(unsigned int cr, unsig
switch ( cr )
{
+ bool noflush;
+
case 0:
rc = hvm_set_cr0(val, true);
break;
case 3:
- rc = hvm_set_cr3(val, true);
+ noflush = hvm_pcid_enabled(curr) && (val & X86_CR3_NOFLUSH);
+ if ( noflush )
+ val &= ~X86_CR3_NOFLUSH;
+ rc = hvm_set_cr3(val, noflush, true);
break;
case 4:
@@ -2276,12 +2281,11 @@ int hvm_set_cr0(unsigned long value, boo
return X86EMUL_OKAY;
}
-int hvm_set_cr3(unsigned long value, bool may_defer)
+int hvm_set_cr3(unsigned long value, bool noflush, bool may_defer)
{
struct vcpu *v = current;
struct page_info *page;
unsigned long old = v->arch.hvm.guest_cr[3];
- bool noflush = false;
if ( may_defer && unlikely(v->domain->arch.monitor.write_ctrlreg_enabled &
monitor_ctrlreg_bitmask(VM_EVENT_X86_CR3)) )
@@ -2293,17 +2297,12 @@ int hvm_set_cr3(unsigned long value, boo
/* The actual write will occur in hvm_do_resume(), if permitted. */
v->arch.vm_event->write_data.do_write.cr3 = 1;
v->arch.vm_event->write_data.cr3 = value;
+ v->arch.vm_event->write_data.cr3_noflush = noflush;
return X86EMUL_OKAY;
}
}
- if ( hvm_pcid_enabled(v) ) /* Clear the noflush bit. */
- {
- noflush = value & X86_CR3_NOFLUSH;
- value &= ~X86_CR3_NOFLUSH;
- }
-
if ( hvm_paging_enabled(v) && !paging_mode_hap(v->domain) &&
(value != v->arch.hvm.guest_cr[3]) )
{
@@ -2998,7 +2997,7 @@ void hvm_task_switch(
if ( task_switch_load_seg(x86_seg_ldtr, tss.ldt, new_cpl, 0) )
goto out;
- rc = hvm_set_cr3(tss.cr3, true);
+ rc = hvm_set_cr3(tss.cr3, false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
if ( rc != X86EMUL_OKAY )
--- a/xen/arch/x86/hvm/svm/nestedsvm.c
+++ b/xen/arch/x86/hvm/svm/nestedsvm.c
@@ -324,7 +324,7 @@ static int nsvm_vcpu_hostrestore(struct
v->arch.guest_table = pagetable_null();
/* hvm_set_cr3() below sets v->arch.hvm.guest_cr[3] for us. */
}
- rc = hvm_set_cr3(n1vmcb->_cr3, true);
+ rc = hvm_set_cr3(n1vmcb->_cr3, false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
if (rc != X86EMUL_OKAY)
@@ -584,7 +584,7 @@ static int nsvm_vmcb_prepare4vmrun(struc
nestedsvm_vmcb_set_nestedp2m(v, ns_vmcb, n2vmcb);
/* hvm_set_cr3() below sets v->arch.hvm.guest_cr[3] for us. */
- rc = hvm_set_cr3(ns_vmcb->_cr3, true);
+ rc = hvm_set_cr3(ns_vmcb->_cr3, false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
if (rc != X86EMUL_OKAY)
@@ -598,7 +598,7 @@ static int nsvm_vmcb_prepare4vmrun(struc
* we assume it intercepts page faults.
*/
/* hvm_set_cr3() below sets v->arch.hvm.guest_cr[3] for us. */
- rc = hvm_set_cr3(ns_vmcb->_cr3, true);
+ rc = hvm_set_cr3(ns_vmcb->_cr3, false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
if (rc != X86EMUL_OKAY)
--- a/xen/arch/x86/hvm/vm_event.c
+++ b/xen/arch/x86/hvm/vm_event.c
@@ -110,7 +110,7 @@ void hvm_vm_event_do_resume(struct vcpu
if ( unlikely(w->do_write.cr3) )
{
- if ( hvm_set_cr3(w->cr3, false) == X86EMUL_EXCEPTION )
+ if ( hvm_set_cr3(w->cr3, w->cr3_noflush, false) == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
w->do_write.cr3 = 0;
--- a/xen/arch/x86/hvm/vmx/vvmx.c
+++ b/xen/arch/x86/hvm/vmx/vvmx.c
@@ -1028,7 +1028,7 @@ static void load_shadow_guest_state(stru
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
- rc = hvm_set_cr3(get_vvmcs(v, GUEST_CR3), true);
+ rc = hvm_set_cr3(get_vvmcs(v, GUEST_CR3), false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
@@ -1242,7 +1242,7 @@ static void load_vvmcs_host_state(struct
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
- rc = hvm_set_cr3(get_vvmcs(v, HOST_CR3), true);
+ rc = hvm_set_cr3(get_vvmcs(v, HOST_CR3), false, true);
if ( rc == X86EMUL_EXCEPTION )
hvm_inject_hw_exception(TRAP_gp_fault, 0);
--- a/xen/include/asm-x86/domain.h
+++ b/xen/include/asm-x86/domain.h
@@ -275,6 +275,8 @@ struct monitor_write_data {
unsigned int cr4 : 1;
} do_write;
+ bool cr3_noflush;
+
uint32_t msr;
uint64_t value;
uint64_t cr0;
--- a/xen/include/asm-x86/hvm/support.h
+++ b/xen/include/asm-x86/hvm/support.h
@@ -135,7 +135,7 @@ void hvm_shadow_handle_cd(struct vcpu *v
*/
int hvm_set_efer(uint64_t value);
int hvm_set_cr0(unsigned long value, bool may_defer);
-int hvm_set_cr3(unsigned long value, bool may_defer);
+int hvm_set_cr3(unsigned long value, bool noflush, bool may_defer);
int hvm_set_cr4(unsigned long value, bool may_defer);
int hvm_descriptor_access_intercept(uint64_t exit_info,
uint64_t vmx_exit_qualification,
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