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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH RFC v13 05/20] pvh: Disable unneeded features of HVM containers
Things kept:
* cacheattr_region lists
* irq-related structures
* paging
* tm_list
* hvm params
Things disabled for now:
* compat xlation
Things disabled:
* Emulated timers and clock sources
* IO/MMIO emulation
* msix tables
* 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>
---
v13:
- Removed unnecessary comment
- Allocate params for hvm domains; remove null checks necessary in last patch
- Add ASSERT(!is_pvh) to handle_pio
CC: Jan Beulich <jbeulich@xxxxxxxx>
CC: Tim Deegan <tim@xxxxxxx>
CC: Keir Fraser <keir@xxxxxxx>
---
xen/arch/x86/hvm/hvm.c | 43 ++++++++++++++++++++++++++++++++++++++-----
xen/arch/x86/hvm/io.c | 7 +++++++
xen/arch/x86/hvm/irq.c | 3 +++
xen/arch/x86/hvm/vmx/intr.c | 3 ++-
4 files changed, 50 insertions(+), 6 deletions(-)
diff --git a/xen/arch/x86/hvm/hvm.c b/xen/arch/x86/hvm/hvm.c
index aaf956a..370bd4d 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 )
{
@@ -528,10 +536,16 @@ int hvm_domain_initialise(struct domain *d)
if ( rc != 0 )
goto fail0;
+ rc = -ENOMEM;
d->arch.hvm_domain.params = xzalloc_array(uint64_t, HVM_NR_PARAMS);
+ if ( !d->arch.hvm_domain.params )
+ goto fail1;
+
+ if ( is_pvh_domain(d) )
+ return 0;
+
d->arch.hvm_domain.io_handler = xmalloc(struct hvm_io_handler);
- rc = -ENOMEM;
- if ( !d->arch.hvm_domain.params || !d->arch.hvm_domain.io_handler )
+ if ( !d->arch.hvm_domain.io_handler )
goto fail1;
d->arch.hvm_domain.io_handler->num_slot = 0;
@@ -578,6 +592,9 @@ 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);
@@ -602,6 +619,10 @@ 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);
@@ -1114,6 +1135,14 @@ 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;
@@ -1188,7 +1217,10 @@ 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(). */
@@ -1389,6 +1421,7 @@ 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..6edc5c9 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);
@@ -228,6 +232,9 @@ int handle_pio(uint16_t port, int size, int dir)
unsigned long data, reps = 1;
int rc;
+ /* PIO for PVH is handled by the PV handlers */
+ ASSERT(!is_pvh_vcpu(curr));
+
if ( dir == IOREQ_WRITE )
data = guest_cpu_user_regs()->eax;
diff --git a/xen/arch/x86/hvm/irq.c b/xen/arch/x86/hvm/irq.c
index 6a6fb68..677fbcd 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/vmx/intr.c b/xen/arch/x86/hvm/vmx/intr.c
index e6d5b46..482413e 100644
--- a/xen/arch/x86/hvm/vmx/intr.c
+++ b/xen/arch/x86/hvm/vmx/intr.c
@@ -225,7 +225,8 @@ 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);
--
1.7.9.5
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