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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC v12 07/21] pvh: Disable unneeded features of HVM containers
Things kept:
* cacheattr_region lists
* irq-related structures
* paging
* tm_list
Things disabled for now:
* compat xlation
Things disabled:
* Emulated timers and clock sources
* IO/MMIO emulation
* msix tables
* hvm params
* hvm_funcs
* nested HVM
* Fast-path for emulated lapic accesses
Getting rid of the hvm_params struct required a couple other places to
check for its existence before attempting to read the params.
Signed-off-by: George Dunlap <george.dunlap@xxxxxxxxxxxxx>
Signed-off-by: Mukesh Rathor <mukesh.rathor@xxxxxxxxxx>
CC: Jan Beulich <jan.beulich@xxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
---
xen/arch/x86/hvm/hvm.c | 37 ++++++++++++++++++++++++++++++++++---
xen/arch/x86/hvm/io.c | 4 ++++
xen/arch/x86/hvm/irq.c | 3 +++
xen/arch/x86/hvm/mtrr.c | 3 ++-
xen/arch/x86/hvm/vmx/intr.c | 3 ++-
xen/arch/x86/hvm/vmx/vmcs.c | 5 +++--
xen/arch/x86/hvm/vmx/vmx.c | 10 ++++++++--
7 files changed, 56 insertions(+), 9 deletions(-)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index 1764b78..6a7a006 100644
--- a/xen/arch/x86/hvm/hvm.c
+++ b/xen/arch/x86/hvm/hvm.c
@@ -301,6 +301,10 @@ u64 hvm_get_guest_tsc_adjust(struct vcpu *v)
void hvm_migrate_timers(struct vcpu *v)
{
+ /* PVH doesn't use rtc and emulated timers, it uses pvclock mechanism. */
+ if ( is_pvh_vcpu(v) )
+ return;
+
rtc_migrate_timers(v);
pt_migrate(v);
}
@@ -342,10 +346,13 @@ void hvm_do_resume(struct vcpu *v)
{
ioreq_t *p;
- pt_restore_timer(v);
-
check_wakeup_from_wait();
+ if ( is_pvh_vcpu(v) )
+ goto check_inject_trap;
+
+ pt_restore_timer(v);
+
/* NB. Optimised for common case (p->state == STATE_IOREQ_NONE). */
p = get_ioreq(v);
while ( p->state != STATE_IOREQ_NONE )
@@ -368,6 +375,7 @@ void hvm_do_resume(struct vcpu *v)
}
}
+ check_inject_trap:
/* Inject pending hw/sw trap */
if ( v->arch.hvm_vcpu.inject_trap.vector != -1 )
{
@@ -521,6 +529,7 @@ int hvm_domain_initialise(struct domain *d)
return -EINVAL;
}
+ /* PVH: pbut_lock and uc_lock unused, but won't hurt */
spin_lock_init(&d->arch.hvm_domain.pbuf_lock);
spin_lock_init(&d->arch.hvm_domain.irq_lock);
spin_lock_init(&d->arch.hvm_domain.uc_lock);
@@ -531,6 +540,9 @@ int hvm_domain_initialise(struct domain *d)
if ( rc != 0 )
goto fail0;
+ if ( is_pvh_domain(d) )
+ return 0;
+
INIT_LIST_HEAD(&d->arch.hvm_domain.msixtbl_list);
spin_lock_init(&d->arch.hvm_domain.msixtbl_list_lock);
@@ -584,6 +596,9 @@ int hvm_domain_initialise(struct domain *d)
void hvm_domain_relinquish_resources(struct domain *d)
{
+ if ( is_pvh_domain(d) )
+ return;
+
if ( hvm_funcs.nhvm_domain_relinquish_resources )
hvm_funcs.nhvm_domain_relinquish_resources(d);
@@ -609,6 +624,10 @@ void hvm_domain_relinquish_resources(struct domain *d)
void hvm_domain_destroy(struct domain *d)
{
hvm_destroy_cacheattr_region_list(d);
+
+ if ( is_pvh_domain(d) )
+ return;
+
hvm_funcs.domain_destroy(d);
rtc_deinit(d);
stdvga_deinit(d);
@@ -1093,6 +1112,14 @@ int hvm_vcpu_initialise(struct vcpu *v)
v->arch.hvm_vcpu.inject_trap.vector = -1;
+ if ( is_pvh_vcpu(v) )
+ {
+ v->arch.hvm_vcpu.hcall_64bit = 1; /* PVH 32bitfixme. */
+ /* This for hvm_long_mode_enabled(v). */
+ v->arch.hvm_vcpu.guest_efer = EFER_SCE | EFER_LMA | EFER_LME;
+ return 0;
+ }
+
rc = setup_compat_arg_xlat(v); /* teardown: free_compat_arg_xlat() */
if ( rc != 0 )
goto fail3;
@@ -1168,7 +1195,10 @@ void hvm_vcpu_destroy(struct vcpu *v)
tasklet_kill(&v->arch.hvm_vcpu.assert_evtchn_irq_tasklet);
hvm_vcpu_cacheattr_destroy(v);
- vlapic_destroy(v);
+
+ if ( is_hvm_vcpu(v) )
+ vlapic_destroy(v);
+
hvm_funcs.vcpu_destroy(v);
/* Event channel is already freed by evtchn_destroy(). */
@@ -1369,6 +1399,7 @@ int hvm_hap_nested_page_fault(paddr_t gpa,
/* For the benefit of 32-bit WinXP (& older Windows) on AMD CPUs,
* a fast path for LAPIC accesses, skipping the p2m lookup. */
if ( !nestedhvm_vcpu_in_guestmode(v)
+ && is_hvm_vcpu(v)
&& gfn == PFN_DOWN(vlapic_base_address(vcpu_vlapic(v))) )
{
if ( !handle_mmio() )
diff --git a/xen/arch/x86/hvm/io.c b/xen/arch/x86/hvm/io.c
index 4ae2c0c..3af4b34 100644
--- a/xen/arch/x86/hvm/io.c
+++ b/xen/arch/x86/hvm/io.c
@@ -175,6 +175,10 @@ int handle_mmio(void)
struct hvm_vcpu_io *vio = &curr->arch.hvm_vcpu.hvm_io;
int rc;
+ /* No MMIO for PVH vcpus */
+ if ( is_pvh_vcpu(curr) )
+ return 0;
+
hvm_emulate_prepare(&ctxt, guest_cpu_user_regs());
rc = hvm_emulate_one(&ctxt);
diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
index 9eae5de..92fb245 100644
--- a/xen/arch/x86/hvm/irq.c
+++ b/xen/arch/x86/hvm/irq.c
@@ -405,6 +405,9 @@ struct hvm_intack hvm_vcpu_has_pending_irq(struct vcpu *v)
&& vcpu_info(v, evtchn_upcall_pending) )
return hvm_intack_vector(plat->irq.callback_via.vector);
+ if ( is_pvh_vcpu(v) )
+ return hvm_intack_none;
+
if ( vlapic_accept_pic_intr(v) && plat->vpic[0].int_output )
return hvm_intack_pic(0);
diff --git a/xen/arch/x86/hvm/mtrr.c b/xen/arch/x86/hvm/mtrr.c
index ef51a8d..df888a6 100644
--- a/xen/arch/x86/hvm/mtrr.c
+++ b/xen/arch/x86/hvm/mtrr.c
@@ -693,7 +693,8 @@ uint8_t epte_get_entry_emt(struct domain *d, unsigned long
gfn, mfn_t mfn,
((d->vcpu == NULL) || ((v = d->vcpu[0]) == NULL)) )
return MTRR_TYPE_WRBACK;
- if ( !v->domain->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] )
+ if ( v->domain->arch.hvm_domain.params
+ && !v->domain->arch.hvm_domain.params[HVM_PARAM_IDENT_PT] )
return MTRR_TYPE_WRBACK;
if ( (v == current) && v->domain->arch.hvm_domain.is_in_uc_mode )
diff --git a/xen/arch/x86/hvm/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c
index e376f3c..5a7a62e 100644
--- a/xen/arch/x86/hvm/vmx/intr.c
+++ b/xen/arch/x86/hvm/vmx/intr.c
@@ -220,7 +220,8 @@ void vmx_intr_assist(void)
}
/* Crank the handle on interrupt state. */
- pt_vector = pt_update_irq(v);
+ if ( is_hvm_vcpu(v) )
+ pt_vector = pt_update_irq(v);
do {
intack = hvm_vcpu_has_pending_irq(v);
diff --git a/xen/arch/x86/hvm/vmx/vmcs.c b/xen/arch/x86/hvm/vmx/vmcs.c
index 7087630..fa90493 100644
--- a/xen/arch/x86/hvm/vmx/vmcs.c
+++ b/xen/arch/x86/hvm/vmx/vmcs.c
@@ -1295,8 +1295,9 @@ void vmx_do_resume(struct vcpu *v)
}
debug_state = v->domain->debugger_attached
- ||
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_INT3]
- ||
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_SINGLE_STEP];
+ || (v->domain->arch.hvm_domain.params
+ &&
(v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_INT3]
+ ||
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_SINGLE_STEP]));
if ( unlikely(v->arch.hvm_vcpu.debug_state_latch != debug_state) )
{
diff --git a/xen/arch/x86/hvm/vmx/vmx.c b/xen/arch/x86/hvm/vmx/vmx.c
index f02e47a..0ac96ab 100644
--- a/xen/arch/x86/hvm/vmx/vmx.c
+++ b/xen/arch/x86/hvm/vmx/vmx.c
@@ -788,7 +788,8 @@ static void vmx_set_segment_register(struct vcpu *v, enum
x86_segment seg,
if ( seg == x86_seg_tr )
{
- if ( v->domain->arch.hvm_domain.params[HVM_PARAM_VM86_TSS] )
+ if ( v->domain->arch.hvm_domain.params
+ && v->domain->arch.hvm_domain.params[HVM_PARAM_VM86_TSS] )
{
sel = 0;
attr = vm86_tr_attr;
@@ -1078,7 +1079,8 @@ static void vmx_update_guest_cr(struct vcpu *v, unsigned
int cr)
v->arch.hvm_vmx.exec_control |= cr3_ctls;
/* Trap CR3 updates if CR3 memory events are enabled. */
- if ( v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_CR3]
)
+ if ( v->domain->arch.hvm_domain.params
+ &&
v->domain->arch.hvm_domain.params[HVM_PARAM_MEMORY_EVENT_CR3] )
v->arch.hvm_vmx.exec_control |= CPU_BASED_CR3_LOAD_EXITING;
vmx_update_cpu_exec_control(v);
@@ -1145,8 +1147,12 @@ static void vmx_update_guest_cr(struct vcpu *v, unsigned
int cr)
if ( paging_mode_hap(v->domain) )
{
if ( !hvm_paging_enabled(v) )
+ {
+ /* We should never get here for pvh domains */
+ ASSERT(v->domain->arch.hvm_domain.params);
v->arch.hvm_vcpu.hw_cr[3] =
v->domain->arch.hvm_domain.params[HVM_PARAM_IDENT_PT];
+ }
vmx_load_pdptrs(v);
}
--
1.7.9.5
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