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[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] x86/p2m: move altp2m-related code to separate file
commit ae7584f63678cd9adc1c2f3a1e813b67a6b24544
Author: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
AuthorDate: Thu May 16 13:36:22 2024 +0200
Commit: Jan Beulich <jbeulich@xxxxxxxx>
CommitDate: Thu May 16 13:36:22 2024 +0200
x86/p2m: move altp2m-related code to separate file
Move altp2m code from generic p2m.c file to altp2m.c, so it is kept
separately
and can possibly be disabled in the build. We may want to disable it when
building for specific platform only, that doesn't support alternate p2m.
No functional change intended.
Signed-off-by: Sergiy Kibrik <Sergiy_Kibrik@xxxxxxxx>
Acked-by: Jan Beulich <jbeulich@xxxxxxxx>
---
xen/arch/x86/mm/altp2m.c | 630 ++++++++++++++++++++++++++++++++++++++++++++++
xen/arch/x86/mm/p2m.c | 632 +----------------------------------------------
xen/arch/x86/mm/p2m.h | 3 +
3 files changed, 635 insertions(+), 630 deletions(-)
diff --git a/xen/arch/x86/mm/altp2m.c b/xen/arch/x86/mm/altp2m.c
index a04297b646..6fe1e9ed6b 100644
--- a/xen/arch/x86/mm/altp2m.c
+++ b/xen/arch/x86/mm/altp2m.c
@@ -7,6 +7,8 @@
#include <asm/hvm/hvm.h>
#include <asm/p2m.h>
#include <asm/altp2m.h>
+#include <public/hvm/hvm_op.h>
+#include <xen/event.h>
#include "mm-locks.h"
#include "p2m.h"
@@ -151,6 +153,634 @@ void p2m_teardown_altp2m(struct domain *d)
}
}
+int altp2m_get_effective_entry(struct p2m_domain *ap2m, gfn_t gfn, mfn_t *mfn,
+ p2m_type_t *t, p2m_access_t *a,
+ bool prepopulate)
+{
+ *mfn = ap2m->get_entry(ap2m, gfn, t, a, 0, NULL, NULL);
+
+ /* Check host p2m if no valid entry in alternate */
+ if ( !mfn_valid(*mfn) && !p2m_is_hostp2m(ap2m) )
+ {
+ struct p2m_domain *hp2m = p2m_get_hostp2m(ap2m->domain);
+ unsigned int page_order;
+ int rc;
+
+ *mfn = p2m_get_gfn_type_access(hp2m, gfn, t, a, P2M_ALLOC |
P2M_UNSHARE,
+ &page_order, 0);
+
+ rc = -ESRCH;
+ if ( !mfn_valid(*mfn) || *t != p2m_ram_rw )
+ return rc;
+
+ /* If this is a superpage, copy that first */
+ if ( prepopulate && page_order != PAGE_ORDER_4K )
+ {
+ unsigned long mask = ~((1UL << page_order) - 1);
+ gfn_t gfn_aligned = _gfn(gfn_x(gfn) & mask);
+ mfn_t mfn_aligned = _mfn(mfn_x(*mfn) & mask);
+
+ rc = ap2m->set_entry(ap2m, gfn_aligned, mfn_aligned, page_order,
*t, *a, 1);
+ if ( rc )
+ return rc;
+ }
+ }
+
+ return 0;
+}
+
+void p2m_altp2m_check(struct vcpu *v, uint16_t idx)
+{
+ if ( altp2m_active(v->domain) )
+ p2m_switch_vcpu_altp2m_by_id(v, idx);
+}
+
+bool p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, unsigned int idx)
+{
+ struct domain *d = v->domain;
+ bool rc = false;
+
+ if ( idx >= MAX_ALTP2M )
+ return rc;
+
+ altp2m_list_lock(d);
+
+ if ( d->arch.altp2m_eptp[idx] != mfn_x(INVALID_MFN) )
+ {
+ if ( p2m_set_altp2m(v, idx) )
+ altp2m_vcpu_update_p2m(v);
+ rc = 1;
+ }
+
+ altp2m_list_unlock(d);
+ return rc;
+}
+
+/*
+ * Read info about the gfn in an altp2m, locking the gfn.
+ *
+ * If the entry is valid, pass the results back to the caller.
+ *
+ * If the entry was invalid, and the host's entry is also invalid,
+ * return to the caller without any changes.
+ *
+ * If the entry is invalid, and the host entry was valid, propagate
+ * the host's entry to the altp2m (retaining page order), and indicate
+ * that the caller should re-try the faulting instruction.
+ */
+bool p2m_altp2m_get_or_propagate(struct p2m_domain *ap2m, unsigned long gfn_l,
+ mfn_t *mfn, p2m_type_t *p2mt,
+ p2m_access_t *p2ma, unsigned int *page_order)
+{
+ p2m_type_t ap2mt;
+ p2m_access_t ap2ma;
+ unsigned int cur_order;
+ unsigned long mask;
+ gfn_t gfn;
+ mfn_t amfn;
+ int rc;
+
+ /*
+ * NB we must get the full lock on the altp2m here, in addition to
+ * the lock on the individual gfn, since we may change a range of
+ * gfns below.
+ */
+ p2m_lock(ap2m);
+
+ amfn = get_gfn_type_access(ap2m, gfn_l, &ap2mt, &ap2ma, 0, &cur_order);
+
+ if ( cur_order > *page_order )
+ cur_order = *page_order;
+
+ if ( !mfn_eq(amfn, INVALID_MFN) )
+ {
+ p2m_unlock(ap2m);
+ *mfn = amfn;
+ *p2mt = ap2mt;
+ *p2ma = ap2ma;
+ *page_order = cur_order;
+ return false;
+ }
+
+ /* Host entry is also invalid; don't bother setting the altp2m entry. */
+ if ( mfn_eq(*mfn, INVALID_MFN) )
+ {
+ p2m_unlock(ap2m);
+ *page_order = cur_order;
+ return false;
+ }
+
+ /*
+ * If this is a superpage mapping, round down both frame numbers
+ * to the start of the superpage. NB that we repupose `amfn`
+ * here.
+ */
+ mask = ~((1UL << cur_order) - 1);
+ amfn = _mfn(mfn_x(*mfn) & mask);
+ gfn = _gfn(gfn_l & mask);
+
+ /* Override the altp2m entry with its default access. */
+ *p2ma = ap2m->default_access;
+
+ rc = p2m_set_entry(ap2m, gfn, amfn, cur_order, *p2mt, *p2ma);
+ p2m_unlock(ap2m);
+
+ if ( rc )
+ {
+ gprintk(XENLOG_ERR,
+ "failed to set entry for %"PRI_gfn" -> %"PRI_mfn" altp2m %u,
rc %d\n",
+ gfn_l, mfn_x(amfn), vcpu_altp2m(current).p2midx, rc);
+ domain_crash(ap2m->domain);
+ }
+
+ return true;
+}
+
+enum altp2m_reset_type {
+ ALTP2M_RESET,
+ ALTP2M_DEACTIVATE
+};
+
+static void p2m_reset_altp2m(struct domain *d, unsigned int idx,
+ enum altp2m_reset_type reset_type)
+{
+ struct p2m_domain *p2m;
+
+ ASSERT(idx < MAX_ALTP2M);
+ p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
+
+ p2m_lock(p2m);
+
+ p2m_flush_table_locked(p2m);
+
+ if ( reset_type == ALTP2M_DEACTIVATE )
+ p2m_free_logdirty(p2m);
+
+ /* Uninit and reinit ept to force TLB shootdown */
+ ept_p2m_uninit(p2m);
+ ept_p2m_init(p2m);
+
+ p2m->min_remapped_gfn = gfn_x(INVALID_GFN);
+ p2m->max_remapped_gfn = 0;
+
+ p2m_unlock(p2m);
+}
+
+void p2m_flush_altp2m(struct domain *d)
+{
+ unsigned int i;
+
+ altp2m_list_lock(d);
+
+ for ( i = 0; i < MAX_ALTP2M; i++ )
+ {
+ p2m_reset_altp2m(d, i, ALTP2M_DEACTIVATE);
+ d->arch.altp2m_eptp[i] = mfn_x(INVALID_MFN);
+ d->arch.altp2m_visible_eptp[i] = mfn_x(INVALID_MFN);
+ }
+
+ altp2m_list_unlock(d);
+}
+
+static int p2m_activate_altp2m(struct domain *d, unsigned int idx,
+ p2m_access_t hvmmem_default_access)
+{
+ struct p2m_domain *hostp2m, *p2m;
+ int rc;
+
+ ASSERT(idx < MAX_ALTP2M);
+
+ p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
+ hostp2m = p2m_get_hostp2m(d);
+
+ p2m_lock(p2m);
+
+ rc = p2m_init_logdirty(p2m);
+
+ if ( rc )
+ goto out;
+
+ /* The following is really just a rangeset copy. */
+ rc = rangeset_merge(p2m->logdirty_ranges, hostp2m->logdirty_ranges);
+
+ if ( rc )
+ {
+ p2m_free_logdirty(p2m);
+ goto out;
+ }
+
+ p2m->default_access = hvmmem_default_access;
+ p2m->domain = hostp2m->domain;
+ p2m->global_logdirty = hostp2m->global_logdirty;
+ p2m->min_remapped_gfn = gfn_x(INVALID_GFN);
+ p2m->max_mapped_pfn = p2m->max_remapped_gfn = 0;
+
+ p2m_init_altp2m_ept(d, idx);
+
+ out:
+ p2m_unlock(p2m);
+
+ return rc;
+}
+
+int p2m_init_altp2m_by_id(struct domain *d, unsigned int idx)
+{
+ int rc = -EINVAL;
+ struct p2m_domain *hostp2m = p2m_get_hostp2m(d);
+
+ if ( idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) )
+ return rc;
+
+ altp2m_list_lock(d);
+
+ if ( d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] ==
+ mfn_x(INVALID_MFN) )
+ rc = p2m_activate_altp2m(d, idx, hostp2m->default_access);
+
+ altp2m_list_unlock(d);
+ return rc;
+}
+
+int p2m_init_next_altp2m(struct domain *d, uint16_t *idx,
+ xenmem_access_t hvmmem_default_access)
+{
+ int rc = -EINVAL;
+ unsigned int i;
+ p2m_access_t a;
+ struct p2m_domain *hostp2m = p2m_get_hostp2m(d);
+
+ if ( hvmmem_default_access > XENMEM_access_default ||
+ !xenmem_access_to_p2m_access(hostp2m, hvmmem_default_access, &a) )
+ return rc;
+
+ altp2m_list_lock(d);
+
+ for ( i = 0; i < MAX_ALTP2M; i++ )
+ {
+ if ( d->arch.altp2m_eptp[i] != mfn_x(INVALID_MFN) )
+ continue;
+
+ rc = p2m_activate_altp2m(d, i, a);
+
+ if ( !rc )
+ *idx = i;
+
+ break;
+ }
+
+ altp2m_list_unlock(d);
+ return rc;
+}
+
+int p2m_destroy_altp2m_by_id(struct domain *d, unsigned int idx)
+{
+ struct p2m_domain *p2m;
+ int rc = -EBUSY;
+
+ if ( !idx || idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) )
+ return rc;
+
+ rc = domain_pause_except_self(d);
+ if ( rc )
+ return rc;
+
+ rc = -EBUSY;
+ altp2m_list_lock(d);
+
+ if ( d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] !=
+ mfn_x(INVALID_MFN) )
+ {
+ p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
+
+ if ( !_atomic_read(p2m->active_vcpus) )
+ {
+ p2m_reset_altp2m(d, idx, ALTP2M_DEACTIVATE);
+ d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] =
+ mfn_x(INVALID_MFN);
+ d->arch.altp2m_visible_eptp[array_index_nospec(idx, MAX_EPTP)] =
+ mfn_x(INVALID_MFN);
+ rc = 0;
+ }
+ }
+
+ altp2m_list_unlock(d);
+
+ domain_unpause_except_self(d);
+
+ return rc;
+}
+
+int p2m_switch_domain_altp2m_by_id(struct domain *d, unsigned int idx)
+{
+ struct vcpu *v;
+ int rc = -EINVAL;
+
+ if ( idx >= MAX_ALTP2M )
+ return rc;
+
+ rc = domain_pause_except_self(d);
+ if ( rc )
+ return rc;
+
+ rc = -EINVAL;
+ altp2m_list_lock(d);
+
+ if ( d->arch.altp2m_visible_eptp[idx] != mfn_x(INVALID_MFN) )
+ {
+ for_each_vcpu( d, v )
+ if ( p2m_set_altp2m(v, idx) )
+ altp2m_vcpu_update_p2m(v);
+
+ rc = 0;
+ }
+
+ altp2m_list_unlock(d);
+
+ domain_unpause_except_self(d);
+
+ return rc;
+}
+
+int p2m_change_altp2m_gfn(struct domain *d, unsigned int idx,
+ gfn_t old_gfn, gfn_t new_gfn)
+{
+ struct p2m_domain *hp2m, *ap2m;
+ p2m_access_t a;
+ p2m_type_t t;
+ mfn_t mfn;
+ int rc = -EINVAL;
+
+ if ( idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
+ d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] ==
+ mfn_x(INVALID_MFN) )
+ return rc;
+
+ hp2m = p2m_get_hostp2m(d);
+ ap2m = array_access_nospec(d->arch.altp2m_p2m, idx);
+
+ p2m_lock(hp2m);
+ p2m_lock(ap2m);
+
+ if ( gfn_eq(new_gfn, INVALID_GFN) )
+ {
+ mfn = ap2m->get_entry(ap2m, old_gfn, &t, &a, 0, NULL, NULL);
+ rc = mfn_valid(mfn)
+ ? p2m_remove_entry(ap2m, old_gfn, mfn, PAGE_ORDER_4K)
+ : 0;
+ goto out;
+ }
+
+ rc = altp2m_get_effective_entry(ap2m, old_gfn, &mfn, &t, &a,
+ AP2MGET_prepopulate);
+ if ( rc )
+ goto out;
+
+ rc = altp2m_get_effective_entry(ap2m, new_gfn, &mfn, &t, &a,
+ AP2MGET_query);
+ if ( rc )
+ goto out;
+
+ if ( !ap2m->set_entry(ap2m, old_gfn, mfn, PAGE_ORDER_4K, t, a,
+ (current->domain != d)) )
+ {
+ rc = 0;
+
+ if ( gfn_x(new_gfn) < ap2m->min_remapped_gfn )
+ ap2m->min_remapped_gfn = gfn_x(new_gfn);
+ if ( gfn_x(new_gfn) > ap2m->max_remapped_gfn )
+ ap2m->max_remapped_gfn = gfn_x(new_gfn);
+ }
+
+ out:
+ p2m_unlock(ap2m);
+ p2m_unlock(hp2m);
+ return rc;
+}
+
+int p2m_altp2m_propagate_change(struct domain *d, gfn_t gfn,
+ mfn_t mfn, unsigned int page_order,
+ p2m_type_t p2mt, p2m_access_t p2ma)
+{
+ struct p2m_domain *p2m;
+ unsigned int i;
+ unsigned int reset_count = 0;
+ unsigned int last_reset_idx = ~0;
+ int ret = 0;
+
+ if ( !altp2m_active(d) )
+ return 0;
+
+ altp2m_list_lock(d);
+
+ for ( i = 0; i < MAX_ALTP2M; i++ )
+ {
+ p2m_type_t t;
+ p2m_access_t a;
+
+ if ( d->arch.altp2m_eptp[i] == mfn_x(INVALID_MFN) )
+ continue;
+
+ p2m = d->arch.altp2m_p2m[i];
+
+ /* Check for a dropped page that may impact this altp2m */
+ if ( mfn_eq(mfn, INVALID_MFN) &&
+ gfn_x(gfn) + (1UL << page_order) > p2m->min_remapped_gfn &&
+ gfn_x(gfn) <= p2m->max_remapped_gfn )
+ {
+ if ( !reset_count++ )
+ {
+ p2m_reset_altp2m(d, i, ALTP2M_RESET);
+ last_reset_idx = i;
+ }
+ else
+ {
+ /* At least 2 altp2m's impacted, so reset everything */
+ for ( i = 0; i < MAX_ALTP2M; i++ )
+ {
+ if ( i == last_reset_idx ||
+ d->arch.altp2m_eptp[i] == mfn_x(INVALID_MFN) )
+ continue;
+
+ p2m_reset_altp2m(d, i, ALTP2M_RESET);
+ }
+
+ ret = 0;
+ break;
+ }
+ }
+ else if ( !mfn_eq(get_gfn_type_access(p2m, gfn_x(gfn), &t, &a, 0,
+ NULL), INVALID_MFN) )
+ {
+ int rc = p2m_set_entry(p2m, gfn, mfn, page_order, p2mt, p2ma);
+
+ /* Best effort: Don't bail on error. */
+ if ( !ret )
+ ret = rc;
+
+ p2m_put_gfn(p2m, gfn);
+ }
+ else
+ p2m_put_gfn(p2m, gfn);
+ }
+
+ altp2m_list_unlock(d);
+
+ return ret;
+}
+
+/*
+ * Set/clear the #VE suppress bit for a page. Only available on VMX.
+ */
+int p2m_set_suppress_ve(struct domain *d, gfn_t gfn, bool suppress_ve,
+ unsigned int altp2m_idx)
+{
+ int rc;
+ struct xen_hvm_altp2m_suppress_ve_multi sve = {
+ altp2m_idx, suppress_ve, 0, 0, gfn_x(gfn), gfn_x(gfn), 0
+ };
+
+ if ( !(rc = p2m_set_suppress_ve_multi(d, &sve)) )
+ rc = sve.first_error;
+
+ return rc;
+}
+
+/*
+ * Set/clear the #VE suppress bit for multiple pages. Only available on VMX.
+ */
+int p2m_set_suppress_ve_multi(struct domain *d,
+ struct xen_hvm_altp2m_suppress_ve_multi *sve)
+{
+ struct p2m_domain *host_p2m = p2m_get_hostp2m(d);
+ struct p2m_domain *ap2m = NULL;
+ struct p2m_domain *p2m = host_p2m;
+ uint64_t start = sve->first_gfn;
+ int rc = 0;
+
+ if ( sve->view > 0 )
+ {
+ if ( sve->view >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
+ d->arch.altp2m_eptp[array_index_nospec(sve->view, MAX_EPTP)] ==
+ mfn_x(INVALID_MFN) )
+ return -EINVAL;
+
+ p2m = ap2m = array_access_nospec(d->arch.altp2m_p2m, sve->view);
+ }
+
+ p2m_lock(host_p2m);
+
+ if ( ap2m )
+ p2m_lock(ap2m);
+
+ while ( sve->last_gfn >= start )
+ {
+ p2m_access_t a;
+ p2m_type_t t;
+ mfn_t mfn;
+ int err = 0;
+
+ if ( (err = altp2m_get_effective_entry(p2m, _gfn(start), &mfn, &t, &a,
+ AP2MGET_query)) &&
+ !sve->first_error )
+ {
+ sve->first_error_gfn = start; /* Save the gfn of the first error */
+ sve->first_error = err; /* Save the first error code */
+ }
+
+ if ( !err && (err = p2m->set_entry(p2m, _gfn(start), mfn,
+ PAGE_ORDER_4K, t, a,
+ sve->suppress_ve)) &&
+ !sve->first_error )
+ {
+ sve->first_error_gfn = start; /* Save the gfn of the first error */
+ sve->first_error = err; /* Save the first error code */
+ }
+
+ /* Check for continuation if it's not the last iteration. */
+ if ( sve->last_gfn >= ++start && hypercall_preempt_check() )
+ {
+ rc = -ERESTART;
+ break;
+ }
+ }
+
+ sve->first_gfn = start;
+
+ if ( ap2m )
+ p2m_unlock(ap2m);
+
+ p2m_unlock(host_p2m);
+
+ return rc;
+}
+
+int p2m_get_suppress_ve(struct domain *d, gfn_t gfn, bool *suppress_ve,
+ unsigned int altp2m_idx)
+{
+ struct p2m_domain *host_p2m = p2m_get_hostp2m(d);
+ struct p2m_domain *ap2m = NULL;
+ struct p2m_domain *p2m;
+ mfn_t mfn;
+ p2m_access_t a;
+ p2m_type_t t;
+ int rc = 0;
+
+ if ( altp2m_idx > 0 )
+ {
+ if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
+ d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] ==
+ mfn_x(INVALID_MFN) )
+ return -EINVAL;
+
+ p2m = ap2m = array_access_nospec(d->arch.altp2m_p2m, altp2m_idx);
+ }
+ else
+ p2m = host_p2m;
+
+ gfn_lock(host_p2m, gfn, 0);
+
+ if ( ap2m )
+ p2m_lock(ap2m);
+
+ mfn = p2m->get_entry(p2m, gfn, &t, &a, 0, NULL, suppress_ve);
+ if ( !mfn_valid(mfn) )
+ rc = -ESRCH;
+
+ if ( ap2m )
+ p2m_unlock(ap2m);
+
+ gfn_unlock(host_p2m, gfn, 0);
+
+ return rc;
+}
+
+int p2m_set_altp2m_view_visibility(struct domain *d, unsigned int altp2m_idx,
+ uint8_t visible)
+{
+ int rc = 0;
+
+ altp2m_list_lock(d);
+
+ /*
+ * Eptp index is correlated with altp2m index and should not exceed
+ * min(MAX_ALTP2M, MAX_EPTP).
+ */
+ if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
+ d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] ==
+ mfn_x(INVALID_MFN) )
+ rc = -EINVAL;
+ else if ( visible )
+ d->arch.altp2m_visible_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] =
+ d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)];
+ else
+ d->arch.altp2m_visible_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] =
+ mfn_x(INVALID_MFN);
+
+ altp2m_list_unlock(d);
+
+ return rc;
+}
+
/*
* Local variables:
* mode: C
diff --git a/xen/arch/x86/mm/p2m.c b/xen/arch/x86/mm/p2m.c
index ce742c12e0..4a4620e870 100644
--- a/xen/arch/x86/mm/p2m.c
+++ b/xen/arch/x86/mm/p2m.c
@@ -500,7 +500,7 @@ int p2m_alloc_table(struct p2m_domain *p2m)
return 0;
}
-static int __must_check
+int
p2m_remove_entry(struct p2m_domain *p2m, gfn_t gfn, mfn_t mfn,
unsigned int page_order)
{
@@ -1329,7 +1329,7 @@ p2m_getlru_nestedp2m(struct domain *d, struct p2m_domain
*p2m)
return p2m;
}
-static void
+void
p2m_flush_table_locked(struct p2m_domain *p2m)
{
struct page_info *top, *pg;
@@ -1729,481 +1729,6 @@ int unmap_mmio_regions(struct domain *d,
return i == nr ? 0 : i ?: ret;
}
-int altp2m_get_effective_entry(struct p2m_domain *ap2m, gfn_t gfn, mfn_t *mfn,
- p2m_type_t *t, p2m_access_t *a,
- bool prepopulate)
-{
- *mfn = ap2m->get_entry(ap2m, gfn, t, a, 0, NULL, NULL);
-
- /* Check host p2m if no valid entry in alternate */
- if ( !mfn_valid(*mfn) && !p2m_is_hostp2m(ap2m) )
- {
- struct p2m_domain *hp2m = p2m_get_hostp2m(ap2m->domain);
- unsigned int page_order;
- int rc;
-
- *mfn = p2m_get_gfn_type_access(hp2m, gfn, t, a, P2M_ALLOC |
P2M_UNSHARE,
- &page_order, 0);
-
- rc = -ESRCH;
- if ( !mfn_valid(*mfn) || *t != p2m_ram_rw )
- return rc;
-
- /* If this is a superpage, copy that first */
- if ( prepopulate && page_order != PAGE_ORDER_4K )
- {
- unsigned long mask = ~((1UL << page_order) - 1);
- gfn_t gfn_aligned = _gfn(gfn_x(gfn) & mask);
- mfn_t mfn_aligned = _mfn(mfn_x(*mfn) & mask);
-
- rc = ap2m->set_entry(ap2m, gfn_aligned, mfn_aligned, page_order,
*t, *a, 1);
- if ( rc )
- return rc;
- }
- }
-
- return 0;
-}
-
-void p2m_altp2m_check(struct vcpu *v, uint16_t idx)
-{
- if ( altp2m_active(v->domain) )
- p2m_switch_vcpu_altp2m_by_id(v, idx);
-}
-
-bool p2m_switch_vcpu_altp2m_by_id(struct vcpu *v, unsigned int idx)
-{
- struct domain *d = v->domain;
- bool rc = false;
-
- if ( idx >= MAX_ALTP2M )
- return rc;
-
- altp2m_list_lock(d);
-
- if ( d->arch.altp2m_eptp[idx] != mfn_x(INVALID_MFN) )
- {
- if ( p2m_set_altp2m(v, idx) )
- altp2m_vcpu_update_p2m(v);
- rc = 1;
- }
-
- altp2m_list_unlock(d);
- return rc;
-}
-
-/*
- * Read info about the gfn in an altp2m, locking the gfn.
- *
- * If the entry is valid, pass the results back to the caller.
- *
- * If the entry was invalid, and the host's entry is also invalid,
- * return to the caller without any changes.
- *
- * If the entry is invalid, and the host entry was valid, propagate
- * the host's entry to the altp2m (retaining page order), and indicate
- * that the caller should re-try the faulting instruction.
- */
-bool p2m_altp2m_get_or_propagate(struct p2m_domain *ap2m, unsigned long gfn_l,
- mfn_t *mfn, p2m_type_t *p2mt,
- p2m_access_t *p2ma, unsigned int *page_order)
-{
- p2m_type_t ap2mt;
- p2m_access_t ap2ma;
- unsigned int cur_order;
- unsigned long mask;
- gfn_t gfn;
- mfn_t amfn;
- int rc;
-
- /*
- * NB we must get the full lock on the altp2m here, in addition to
- * the lock on the individual gfn, since we may change a range of
- * gfns below.
- */
- p2m_lock(ap2m);
-
- amfn = get_gfn_type_access(ap2m, gfn_l, &ap2mt, &ap2ma, 0, &cur_order);
-
- if ( cur_order > *page_order )
- cur_order = *page_order;
-
- if ( !mfn_eq(amfn, INVALID_MFN) )
- {
- p2m_unlock(ap2m);
- *mfn = amfn;
- *p2mt = ap2mt;
- *p2ma = ap2ma;
- *page_order = cur_order;
- return false;
- }
-
- /* Host entry is also invalid; don't bother setting the altp2m entry. */
- if ( mfn_eq(*mfn, INVALID_MFN) )
- {
- p2m_unlock(ap2m);
- *page_order = cur_order;
- return false;
- }
-
- /*
- * If this is a superpage mapping, round down both frame numbers
- * to the start of the superpage. NB that we repupose `amfn`
- * here.
- */
- mask = ~((1UL << cur_order) - 1);
- amfn = _mfn(mfn_x(*mfn) & mask);
- gfn = _gfn(gfn_l & mask);
-
- /* Override the altp2m entry with its default access. */
- *p2ma = ap2m->default_access;
-
- rc = p2m_set_entry(ap2m, gfn, amfn, cur_order, *p2mt, *p2ma);
- p2m_unlock(ap2m);
-
- if ( rc )
- {
- gprintk(XENLOG_ERR,
- "failed to set entry for %"PRI_gfn" -> %"PRI_mfn" altp2m %u,
rc %d\n",
- gfn_l, mfn_x(amfn), vcpu_altp2m(current).p2midx, rc);
- domain_crash(ap2m->domain);
- }
-
- return true;
-}
-
-enum altp2m_reset_type {
- ALTP2M_RESET,
- ALTP2M_DEACTIVATE
-};
-
-static void p2m_reset_altp2m(struct domain *d, unsigned int idx,
- enum altp2m_reset_type reset_type)
-{
- struct p2m_domain *p2m;
-
- ASSERT(idx < MAX_ALTP2M);
- p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
-
- p2m_lock(p2m);
-
- p2m_flush_table_locked(p2m);
-
- if ( reset_type == ALTP2M_DEACTIVATE )
- p2m_free_logdirty(p2m);
-
- /* Uninit and reinit ept to force TLB shootdown */
- ept_p2m_uninit(p2m);
- ept_p2m_init(p2m);
-
- p2m->min_remapped_gfn = gfn_x(INVALID_GFN);
- p2m->max_remapped_gfn = 0;
-
- p2m_unlock(p2m);
-}
-
-void p2m_flush_altp2m(struct domain *d)
-{
- unsigned int i;
-
- altp2m_list_lock(d);
-
- for ( i = 0; i < MAX_ALTP2M; i++ )
- {
- p2m_reset_altp2m(d, i, ALTP2M_DEACTIVATE);
- d->arch.altp2m_eptp[i] = mfn_x(INVALID_MFN);
- d->arch.altp2m_visible_eptp[i] = mfn_x(INVALID_MFN);
- }
-
- altp2m_list_unlock(d);
-}
-
-static int p2m_activate_altp2m(struct domain *d, unsigned int idx,
- p2m_access_t hvmmem_default_access)
-{
- struct p2m_domain *hostp2m, *p2m;
- int rc;
-
- ASSERT(idx < MAX_ALTP2M);
-
- p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
- hostp2m = p2m_get_hostp2m(d);
-
- p2m_lock(p2m);
-
- rc = p2m_init_logdirty(p2m);
-
- if ( rc )
- goto out;
-
- /* The following is really just a rangeset copy. */
- rc = rangeset_merge(p2m->logdirty_ranges, hostp2m->logdirty_ranges);
-
- if ( rc )
- {
- p2m_free_logdirty(p2m);
- goto out;
- }
-
- p2m->default_access = hvmmem_default_access;
- p2m->domain = hostp2m->domain;
- p2m->global_logdirty = hostp2m->global_logdirty;
- p2m->min_remapped_gfn = gfn_x(INVALID_GFN);
- p2m->max_mapped_pfn = p2m->max_remapped_gfn = 0;
-
- p2m_init_altp2m_ept(d, idx);
-
- out:
- p2m_unlock(p2m);
-
- return rc;
-}
-
-int p2m_init_altp2m_by_id(struct domain *d, unsigned int idx)
-{
- int rc = -EINVAL;
- struct p2m_domain *hostp2m = p2m_get_hostp2m(d);
-
- if ( idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) )
- return rc;
-
- altp2m_list_lock(d);
-
- if ( d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] ==
- mfn_x(INVALID_MFN) )
- rc = p2m_activate_altp2m(d, idx, hostp2m->default_access);
-
- altp2m_list_unlock(d);
- return rc;
-}
-
-int p2m_init_next_altp2m(struct domain *d, uint16_t *idx,
- xenmem_access_t hvmmem_default_access)
-{
- int rc = -EINVAL;
- unsigned int i;
- p2m_access_t a;
- struct p2m_domain *hostp2m = p2m_get_hostp2m(d);
-
- if ( hvmmem_default_access > XENMEM_access_default ||
- !xenmem_access_to_p2m_access(hostp2m, hvmmem_default_access, &a) )
- return rc;
-
- altp2m_list_lock(d);
-
- for ( i = 0; i < MAX_ALTP2M; i++ )
- {
- if ( d->arch.altp2m_eptp[i] != mfn_x(INVALID_MFN) )
- continue;
-
- rc = p2m_activate_altp2m(d, i, a);
-
- if ( !rc )
- *idx = i;
-
- break;
- }
-
- altp2m_list_unlock(d);
- return rc;
-}
-
-int p2m_destroy_altp2m_by_id(struct domain *d, unsigned int idx)
-{
- struct p2m_domain *p2m;
- int rc = -EBUSY;
-
- if ( !idx || idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) )
- return rc;
-
- rc = domain_pause_except_self(d);
- if ( rc )
- return rc;
-
- rc = -EBUSY;
- altp2m_list_lock(d);
-
- if ( d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] !=
- mfn_x(INVALID_MFN) )
- {
- p2m = array_access_nospec(d->arch.altp2m_p2m, idx);
-
- if ( !_atomic_read(p2m->active_vcpus) )
- {
- p2m_reset_altp2m(d, idx, ALTP2M_DEACTIVATE);
- d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] =
- mfn_x(INVALID_MFN);
- d->arch.altp2m_visible_eptp[array_index_nospec(idx, MAX_EPTP)] =
- mfn_x(INVALID_MFN);
- rc = 0;
- }
- }
-
- altp2m_list_unlock(d);
-
- domain_unpause_except_self(d);
-
- return rc;
-}
-
-int p2m_switch_domain_altp2m_by_id(struct domain *d, unsigned int idx)
-{
- struct vcpu *v;
- int rc = -EINVAL;
-
- if ( idx >= MAX_ALTP2M )
- return rc;
-
- rc = domain_pause_except_self(d);
- if ( rc )
- return rc;
-
- rc = -EINVAL;
- altp2m_list_lock(d);
-
- if ( d->arch.altp2m_visible_eptp[idx] != mfn_x(INVALID_MFN) )
- {
- for_each_vcpu( d, v )
- if ( p2m_set_altp2m(v, idx) )
- altp2m_vcpu_update_p2m(v);
-
- rc = 0;
- }
-
- altp2m_list_unlock(d);
-
- domain_unpause_except_self(d);
-
- return rc;
-}
-
-int p2m_change_altp2m_gfn(struct domain *d, unsigned int idx,
- gfn_t old_gfn, gfn_t new_gfn)
-{
- struct p2m_domain *hp2m, *ap2m;
- p2m_access_t a;
- p2m_type_t t;
- mfn_t mfn;
- int rc = -EINVAL;
-
- if ( idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
- d->arch.altp2m_eptp[array_index_nospec(idx, MAX_EPTP)] ==
- mfn_x(INVALID_MFN) )
- return rc;
-
- hp2m = p2m_get_hostp2m(d);
- ap2m = array_access_nospec(d->arch.altp2m_p2m, idx);
-
- p2m_lock(hp2m);
- p2m_lock(ap2m);
-
- if ( gfn_eq(new_gfn, INVALID_GFN) )
- {
- mfn = ap2m->get_entry(ap2m, old_gfn, &t, &a, 0, NULL, NULL);
- rc = mfn_valid(mfn)
- ? p2m_remove_entry(ap2m, old_gfn, mfn, PAGE_ORDER_4K)
- : 0;
- goto out;
- }
-
- rc = altp2m_get_effective_entry(ap2m, old_gfn, &mfn, &t, &a,
- AP2MGET_prepopulate);
- if ( rc )
- goto out;
-
- rc = altp2m_get_effective_entry(ap2m, new_gfn, &mfn, &t, &a,
- AP2MGET_query);
- if ( rc )
- goto out;
-
- if ( !ap2m->set_entry(ap2m, old_gfn, mfn, PAGE_ORDER_4K, t, a,
- (current->domain != d)) )
- {
- rc = 0;
-
- if ( gfn_x(new_gfn) < ap2m->min_remapped_gfn )
- ap2m->min_remapped_gfn = gfn_x(new_gfn);
- if ( gfn_x(new_gfn) > ap2m->max_remapped_gfn )
- ap2m->max_remapped_gfn = gfn_x(new_gfn);
- }
-
- out:
- p2m_unlock(ap2m);
- p2m_unlock(hp2m);
- return rc;
-}
-
-int p2m_altp2m_propagate_change(struct domain *d, gfn_t gfn,
- mfn_t mfn, unsigned int page_order,
- p2m_type_t p2mt, p2m_access_t p2ma)
-{
- struct p2m_domain *p2m;
- unsigned int i;
- unsigned int reset_count = 0;
- unsigned int last_reset_idx = ~0;
- int ret = 0;
-
- if ( !altp2m_active(d) )
- return 0;
-
- altp2m_list_lock(d);
-
- for ( i = 0; i < MAX_ALTP2M; i++ )
- {
- p2m_type_t t;
- p2m_access_t a;
-
- if ( d->arch.altp2m_eptp[i] == mfn_x(INVALID_MFN) )
- continue;
-
- p2m = d->arch.altp2m_p2m[i];
-
- /* Check for a dropped page that may impact this altp2m */
- if ( mfn_eq(mfn, INVALID_MFN) &&
- gfn_x(gfn) + (1UL << page_order) > p2m->min_remapped_gfn &&
- gfn_x(gfn) <= p2m->max_remapped_gfn )
- {
- if ( !reset_count++ )
- {
- p2m_reset_altp2m(d, i, ALTP2M_RESET);
- last_reset_idx = i;
- }
- else
- {
- /* At least 2 altp2m's impacted, so reset everything */
- for ( i = 0; i < MAX_ALTP2M; i++ )
- {
- if ( i == last_reset_idx ||
- d->arch.altp2m_eptp[i] == mfn_x(INVALID_MFN) )
- continue;
-
- p2m_reset_altp2m(d, i, ALTP2M_RESET);
- }
-
- ret = 0;
- break;
- }
- }
- else if ( !mfn_eq(get_gfn_type_access(p2m, gfn_x(gfn), &t, &a, 0,
- NULL), INVALID_MFN) )
- {
- int rc = p2m_set_entry(p2m, gfn, mfn, page_order, p2mt, p2ma);
-
- /* Best effort: Don't bail on error. */
- if ( !ret )
- ret = rc;
-
- p2m_put_gfn(p2m, gfn);
- }
- else
- p2m_put_gfn(p2m, gfn);
- }
-
- altp2m_list_unlock(d);
-
- return ret;
-}
-
/*** Audit ***/
#if P2M_AUDIT
@@ -2540,159 +2065,6 @@ int xenmem_add_to_physmap_one(
return rc;
}
-/*
- * Set/clear the #VE suppress bit for a page. Only available on VMX.
- */
-int p2m_set_suppress_ve(struct domain *d, gfn_t gfn, bool suppress_ve,
- unsigned int altp2m_idx)
-{
- int rc;
- struct xen_hvm_altp2m_suppress_ve_multi sve = {
- altp2m_idx, suppress_ve, 0, 0, gfn_x(gfn), gfn_x(gfn), 0
- };
-
- if ( !(rc = p2m_set_suppress_ve_multi(d, &sve)) )
- rc = sve.first_error;
-
- return rc;
-}
-
-/*
- * Set/clear the #VE suppress bit for multiple pages. Only available on VMX.
- */
-int p2m_set_suppress_ve_multi(struct domain *d,
- struct xen_hvm_altp2m_suppress_ve_multi *sve)
-{
- struct p2m_domain *host_p2m = p2m_get_hostp2m(d);
- struct p2m_domain *ap2m = NULL;
- struct p2m_domain *p2m = host_p2m;
- uint64_t start = sve->first_gfn;
- int rc = 0;
-
- if ( sve->view > 0 )
- {
- if ( sve->view >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
- d->arch.altp2m_eptp[array_index_nospec(sve->view, MAX_EPTP)] ==
- mfn_x(INVALID_MFN) )
- return -EINVAL;
-
- p2m = ap2m = array_access_nospec(d->arch.altp2m_p2m, sve->view);
- }
-
- p2m_lock(host_p2m);
-
- if ( ap2m )
- p2m_lock(ap2m);
-
- while ( sve->last_gfn >= start )
- {
- p2m_access_t a;
- p2m_type_t t;
- mfn_t mfn;
- int err = 0;
-
- if ( (err = altp2m_get_effective_entry(p2m, _gfn(start), &mfn, &t, &a,
- AP2MGET_query)) &&
- !sve->first_error )
- {
- sve->first_error_gfn = start; /* Save the gfn of the first error */
- sve->first_error = err; /* Save the first error code */
- }
-
- if ( !err && (err = p2m->set_entry(p2m, _gfn(start), mfn,
- PAGE_ORDER_4K, t, a,
- sve->suppress_ve)) &&
- !sve->first_error )
- {
- sve->first_error_gfn = start; /* Save the gfn of the first error */
- sve->first_error = err; /* Save the first error code */
- }
-
- /* Check for continuation if it's not the last iteration. */
- if ( sve->last_gfn >= ++start && hypercall_preempt_check() )
- {
- rc = -ERESTART;
- break;
- }
- }
-
- sve->first_gfn = start;
-
- if ( ap2m )
- p2m_unlock(ap2m);
-
- p2m_unlock(host_p2m);
-
- return rc;
-}
-
-int p2m_get_suppress_ve(struct domain *d, gfn_t gfn, bool *suppress_ve,
- unsigned int altp2m_idx)
-{
- struct p2m_domain *host_p2m = p2m_get_hostp2m(d);
- struct p2m_domain *ap2m = NULL;
- struct p2m_domain *p2m;
- mfn_t mfn;
- p2m_access_t a;
- p2m_type_t t;
- int rc = 0;
-
- if ( altp2m_idx > 0 )
- {
- if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
- d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] ==
- mfn_x(INVALID_MFN) )
- return -EINVAL;
-
- p2m = ap2m = array_access_nospec(d->arch.altp2m_p2m, altp2m_idx);
- }
- else
- p2m = host_p2m;
-
- gfn_lock(host_p2m, gfn, 0);
-
- if ( ap2m )
- p2m_lock(ap2m);
-
- mfn = p2m->get_entry(p2m, gfn, &t, &a, 0, NULL, suppress_ve);
- if ( !mfn_valid(mfn) )
- rc = -ESRCH;
-
- if ( ap2m )
- p2m_unlock(ap2m);
-
- gfn_unlock(host_p2m, gfn, 0);
-
- return rc;
-}
-
-int p2m_set_altp2m_view_visibility(struct domain *d, unsigned int altp2m_idx,
- uint8_t visible)
-{
- int rc = 0;
-
- altp2m_list_lock(d);
-
- /*
- * Eptp index is correlated with altp2m index and should not exceed
- * min(MAX_ALTP2M, MAX_EPTP).
- */
- if ( altp2m_idx >= min(ARRAY_SIZE(d->arch.altp2m_p2m), MAX_EPTP) ||
- d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] ==
- mfn_x(INVALID_MFN) )
- rc = -EINVAL;
- else if ( visible )
- d->arch.altp2m_visible_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] =
- d->arch.altp2m_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)];
- else
- d->arch.altp2m_visible_eptp[array_index_nospec(altp2m_idx, MAX_EPTP)] =
- mfn_x(INVALID_MFN);
-
- altp2m_list_unlock(d);
-
- return rc;
-}
-
/*
* Local variables:
* mode: C
diff --git a/xen/arch/x86/mm/p2m.h b/xen/arch/x86/mm/p2m.h
index 04308cfb6d..635f5a7f45 100644
--- a/xen/arch/x86/mm/p2m.h
+++ b/xen/arch/x86/mm/p2m.h
@@ -22,6 +22,9 @@ static inline void p2m_free_logdirty(struct p2m_domain *p2m)
{}
int p2m_init_altp2m(struct domain *d);
void p2m_teardown_altp2m(struct domain *d);
+void p2m_flush_table_locked(struct p2m_domain *p2m);
+int __must_check p2m_remove_entry(struct p2m_domain *p2m, gfn_t gfn, mfn_t mfn,
+ unsigned int page_order);
void p2m_nestedp2m_init(struct p2m_domain *p2m);
int p2m_init_nestedp2m(struct domain *d);
void p2m_teardown_nestedp2m(struct domain *d);
--
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