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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-changelog] [xen-unstable] [HVM] Save/restore cleanups: don't save state for downed vcpus.
# HG changeset patch
# User Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
# Date 1170089369 0
# Node ID 99d36a1530249cc4b918e83dfc5a62324f63b3bf
# Parent 5bb0840984936749b4e99f53931d72a8579d302c
[HVM] Save/restore cleanups: don't save state for downed vcpus.
(Since we wouldn't load it anyway)
Also tidy up the plumbing around the hypercalls.
Signed-off-by: Tim Deegan <Tim.Deegan@xxxxxxxxxxxxx>
---
xen/arch/x86/domctl.c | 20 ++++++++----------
xen/arch/x86/hvm/hvm.c | 15 ++++---------
xen/arch/x86/hvm/intercept.c | 41 +++++++++-----------------------------
xen/include/asm-x86/hvm/support.h | 7 +-----
4 files changed, 26 insertions(+), 57 deletions(-)
diff -r 5bb084098493 -r 99d36a153024 xen/arch/x86/domctl.c
--- a/xen/arch/x86/domctl.c Mon Jan 29 13:22:21 2007 +0000
+++ b/xen/arch/x86/domctl.c Mon Jan 29 16:49:29 2007 +0000
@@ -290,7 +290,6 @@ long arch_do_domctl(
{
struct hvm_domain_context *c;
struct domain *d;
- struct vcpu *v;
ret = -ESRCH;
if ( (d = get_domain_by_id(domctl->domain)) == NULL )
@@ -299,15 +298,16 @@ long arch_do_domctl(
ret = -ENOMEM;
if ( (c = xmalloc(struct hvm_domain_context)) == NULL )
goto sethvmcontext_out;
-
- v = d->vcpu[0];
ret = -EFAULT;
-
if ( copy_from_guest(c, domctl->u.hvmcontext.ctxt, 1) != 0 )
goto sethvmcontext_out;
- ret = arch_sethvm_ctxt(v, c);
+ ret = -EINVAL;
+ if ( !is_hvm_domain(d) )
+ goto sethvmcontext_out;
+
+ ret = hvm_load(d, c);
xfree(c);
@@ -321,7 +321,6 @@ long arch_do_domctl(
{
struct hvm_domain_context *c;
struct domain *d;
- struct vcpu *v;
ret = -ESRCH;
if ( (d = get_domain_by_id(domctl->domain)) == NULL )
@@ -330,15 +329,14 @@ long arch_do_domctl(
ret = -ENOMEM;
if ( (c = xmalloc(struct hvm_domain_context)) == NULL )
goto gethvmcontext_out;
-
- v = d->vcpu[0];
-
+ memset(c, 0, sizeof(*c));
+
ret = -ENODATA;
- if ( !test_bit(_VCPUF_initialised, &v->vcpu_flags) )
+ if ( !is_hvm_domain(d) )
goto gethvmcontext_out;
ret = 0;
- if (arch_gethvm_ctxt(v, c) == -1)
+ if (hvm_save(d, c) != 0)
ret = -EFAULT;
if ( copy_to_guest(domctl->u.hvmcontext.ctxt, c, 1) )
diff -r 5bb084098493 -r 99d36a153024 xen/arch/x86/hvm/hvm.c
--- a/xen/arch/x86/hvm/hvm.c Mon Jan 29 13:22:21 2007 +0000
+++ b/xen/arch/x86/hvm/hvm.c Mon Jan 29 16:49:29 2007 +0000
@@ -189,31 +189,26 @@ void hvm_domain_destroy(struct domain *d
unmap_domain_page_global((void *)d->arch.hvm_domain.buffered_io_va);
}
-#define HVM_VCPU_CTXT_MAGIC 0x85963130
void hvm_save_cpu_ctxt(hvm_domain_context_t *h, void *opaque)
{
struct vcpu *v = opaque;
- if ( test_bit(_VCPUF_down, &v->vcpu_flags) ) {
- hvm_put_32u(h, 0x0);
+ /* We don't need to save state for a vcpu that is down; the restore
+ * code will leave it down if there is nothing saved. */
+ if ( test_bit(_VCPUF_down, &v->vcpu_flags) )
return;
- }
-
- hvm_put_32u(h, HVM_VCPU_CTXT_MAGIC);
+
hvm_funcs.save_cpu_ctxt(h, opaque);
}
int hvm_load_cpu_ctxt(hvm_domain_context_t *h, void *opaque, int version)
{
struct vcpu *v = opaque;
-
- if ( hvm_get_32u(h) != HVM_VCPU_CTXT_MAGIC )
- return 0;
if ( hvm_funcs.load_cpu_ctxt(h, opaque, version) < 0 )
return -EINVAL;
- /* Auxiliary processors shoudl be woken immediately. */
+ /* Auxiliary processors should be woken immediately. */
if ( test_and_clear_bit(_VCPUF_down, &v->vcpu_flags) )
vcpu_wake(v);
diff -r 5bb084098493 -r 99d36a153024 xen/arch/x86/hvm/intercept.c
--- a/xen/arch/x86/hvm/intercept.c Mon Jan 29 13:22:21 2007 +0000
+++ b/xen/arch/x86/hvm/intercept.c Mon Jan 29 16:49:29 2007 +0000
@@ -190,20 +190,13 @@ int hvm_register_savevm(struct domain *d
return 0;
}
-int hvm_save(struct vcpu *v, hvm_domain_context_t *h)
+int hvm_save(struct domain *d, hvm_domain_context_t *h)
{
uint32_t len, len_pos, cur_pos;
uint32_t eax, ebx, ecx, edx;
HVMStateEntry *se;
char *chgset;
struct hvm_save_header hdr;
-
- if (!is_hvm_vcpu(v)) {
- printk("hvm_save only for hvm guest!\n");
- return -1;
- }
-
- memset(h, 0, sizeof(hvm_domain_context_t));
hdr.magic = HVM_FILE_MAGIC;
hdr.version = HVM_FILE_VERSION;
@@ -222,7 +215,7 @@ int hvm_save(struct vcpu *v, hvm_domain_
hvm_put_8u(h, len);
hvm_put_buffer(h, chgset, len);
- for(se = v->domain->arch.hvm_domain.first_se; se != NULL; se = se->next) {
+ for(se = d->arch.hvm_domain.first_se; se != NULL; se = se->next) {
/* ID string */
len = strnlen(se->idstr, HVM_SE_IDSTR_LEN);
hvm_put_8u(h, len);
@@ -270,7 +263,7 @@ static HVMStateEntry *find_se(struct dom
return NULL;
}
-int hvm_load(struct vcpu *v, hvm_domain_context_t *h)
+int hvm_load(struct domain *d, hvm_domain_context_t *h)
{
uint32_t len, rec_len, rec_pos, instance_id, version_id;
uint32_t eax, ebx, ecx, edx;
@@ -280,11 +273,7 @@ int hvm_load(struct vcpu *v, hvm_domain_
char *cur_chgset;
int ret;
struct hvm_save_header hdr;
-
- if (!is_hvm_vcpu(v)) {
- printk("hvm_load only for hvm guest!\n");
- return -1;
- }
+ struct vcpu *v;
if (h->size >= HVM_CTXT_SIZE) {
printk("hvm_load fail! seems hvm_domain_context overflow when
hvm_save! need %"PRId32" bytes.\n", h->size);
@@ -339,6 +328,11 @@ int hvm_load(struct vcpu *v, hvm_domain_
printk("warnings: try to restore hvm guest when changeset is
unavailable.\n");
+ /* Down all the vcpus: we only re-enable the ones that had state saved. */
+ for_each_vcpu(d, v)
+ if ( test_and_set_bit(_VCPUF_down, &v->vcpu_flags) )
+ vcpu_sleep_nosync(v);
+
while(1) {
if (hvm_ctxt_end(h)) {
break;
@@ -362,7 +356,7 @@ int hvm_load(struct vcpu *v, hvm_domain_
rec_len = hvm_get_32u(h);
rec_pos = hvm_ctxt_tell(h);
- se = find_se(v->domain, idstr, instance_id);
+ se = find_se(d, idstr, instance_id);
if (se == NULL) {
printk("warnings: hvm load can't find device %s's instance %d!\n",
idstr, instance_id);
@@ -384,21 +378,6 @@ int hvm_load(struct vcpu *v, hvm_domain_
return 0;
}
-int arch_gethvm_ctxt(
- struct vcpu *v, struct hvm_domain_context *c)
-{
- if ( !is_hvm_vcpu(v) )
- return -1;
-
- return hvm_save(v, c);
-
-}
-
-int arch_sethvm_ctxt(
- struct vcpu *v, struct hvm_domain_context *c)
-{
- return hvm_load(v, c);
-}
#ifdef HVM_DEBUG_SUSPEND
static void shpage_info(shared_iopage_t *sh)
diff -r 5bb084098493 -r 99d36a153024 xen/include/asm-x86/hvm/support.h
--- a/xen/include/asm-x86/hvm/support.h Mon Jan 29 13:22:21 2007 +0000
+++ b/xen/include/asm-x86/hvm/support.h Mon Jan 29 16:49:29 2007 +0000
@@ -242,11 +242,8 @@ static inline void hvm_get_buffer(hvm_do
#define hvm_get_struct(_h, _p) \
hvm_get_buffer((_h), (char *)(_p), sizeof(*(_p)))
-int hvm_save(struct vcpu*, hvm_domain_context_t *h);
-int hvm_load(struct vcpu*, hvm_domain_context_t *h);
-
-int arch_sethvm_ctxt(struct vcpu *v, struct hvm_domain_context *c);
-int arch_gethvm_ctxt(struct vcpu *v, struct hvm_domain_context *c);
+int hvm_save(struct domain *d, hvm_domain_context_t *h);
+int hvm_load(struct domain *d, hvm_domain_context_t *h);
void shpage_init(struct domain *d, shared_iopage_t *sp);
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