diff options
Diffstat (limited to '0035-x86-shadow-drop-replace-bogus-assertions.patch')
| -rw-r--r-- | 0035-x86-shadow-drop-replace-bogus-assertions.patch | 71 |
1 files changed, 0 insertions, 71 deletions
diff --git a/0035-x86-shadow-drop-replace-bogus-assertions.patch b/0035-x86-shadow-drop-replace-bogus-assertions.patch deleted file mode 100644 index 55e9f62..0000000 --- a/0035-x86-shadow-drop-replace-bogus-assertions.patch +++ /dev/null @@ -1,71 +0,0 @@ -From 9fdb4f17656f74b35af0882b558e44832ff00b5f Mon Sep 17 00:00:00 2001 -From: Jan Beulich <jbeulich@suse.com> -Date: Mon, 31 Oct 2022 13:24:33 +0100 -Subject: [PATCH 35/87] x86/shadow: drop (replace) bogus assertions -MIME-Version: 1.0 -Content-Type: text/plain; charset=UTF-8 -Content-Transfer-Encoding: 8bit - -The addition of a call to shadow_blow_tables() from shadow_teardown() -has resulted in the "no vcpus" related assertion becoming triggerable: -If domain_create() fails with at least one page successfully allocated -in the course of shadow_enable(), or if domain_create() succeeds and -the domain is then killed without ever invoking XEN_DOMCTL_max_vcpus. -Note that in-tree tests (test-resource and test-tsx) do exactly the -latter of these two. - -The assertion's comment was bogus anyway: Shadow mode has been getting -enabled before allocation of vCPU-s for quite some time. Convert the -assertion to a conditional: As long as there are no vCPU-s, there's -nothing to blow away. - -Fixes: e7aa55c0aab3 ("x86/p2m: free the paging memory pool preemptively") -Reported-by: Andrew Cooper <andrew.cooper3@citrix.com> - -A similar assertion/comment pair exists in _shadow_prealloc(); the -comment is similarly bogus, and the assertion could in principle trigger -e.g. when shadow_alloc_p2m_page() is called early enough. Replace those -at the same time by a similar early return, here indicating failure to -the caller (which will generally lead to the domain being crashed in -shadow_prealloc()). - -Signed-off-by: Jan Beulich <jbeulich@suse.com> -Acked-by: Roger Pau Monné <roger.pau@citrix.com> -Acked-by: Andrew Cooper <andrew.cooper3@citrix.com> -master commit: a92dc2bb30ba65ae25d2f417677eb7ef9a6a0fef -master date: 2022-10-24 15:46:11 +0200 ---- - xen/arch/x86/mm/shadow/common.c | 10 ++++++---- - 1 file changed, 6 insertions(+), 4 deletions(-) - -diff --git a/xen/arch/x86/mm/shadow/common.c b/xen/arch/x86/mm/shadow/common.c -index 3b0d781991b5..1de0139742f7 100644 ---- a/xen/arch/x86/mm/shadow/common.c -+++ b/xen/arch/x86/mm/shadow/common.c -@@ -943,8 +943,9 @@ static bool __must_check _shadow_prealloc(struct domain *d, unsigned int pages) - /* No reclaim when the domain is dying, teardown will take care of it. */ - return false; - -- /* Shouldn't have enabled shadows if we've no vcpus. */ -- ASSERT(d->vcpu && d->vcpu[0]); -+ /* Nothing to reclaim when there are no vcpus yet. */ -+ if ( !d->vcpu[0] ) -+ return false; - - /* Stage one: walk the list of pinned pages, unpinning them */ - perfc_incr(shadow_prealloc_1); -@@ -1034,8 +1035,9 @@ void shadow_blow_tables(struct domain *d) - mfn_t smfn; - int i; - -- /* Shouldn't have enabled shadows if we've no vcpus. */ -- ASSERT(d->vcpu && d->vcpu[0]); -+ /* Nothing to do when there are no vcpus yet. */ -+ if ( !d->vcpu[0] ) -+ return; - - /* Pass one: unpin all pinned pages */ - foreach_pinned_shadow(d, sp, t) --- -2.37.4 - |