[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [xen master] libxl: fix guest kexec - skip cpuid policy
commit 1e454c2b5b1172e0fc7457e411ebaba61db8fc87 Author: Jason Andryuk <jandryuk@xxxxxxxxx> AuthorDate: Thu Jan 26 10:58:23 2023 +0100 Commit: Jan Beulich <jbeulich@xxxxxxxx> CommitDate: Thu Jan 26 10:58:23 2023 +0100 libxl: fix guest kexec - skip cpuid policy When a domain performs a kexec (soft reset), libxl__build_pre() is called with the existing domid. Calling libxl__cpuid_legacy() on the existing domain fails since the cpuid policy has already been set, and the guest isn't rebuilt and doesn't kexec. xc: error: Failed to set d1's policy (err leaf 0xffffffff, subleaf 0xffffffff, msr 0xffffffff) (17 = File exists): Internal error libxl: error: libxl_cpuid.c:494:libxl__cpuid_legacy: Domain 1:Failed to apply CPUID policy: File exists libxl: error: libxl_create.c:1641:domcreate_rebuild_done: Domain 1:cannot (re-)build domain: -3 libxl: error: libxl_xshelp.c:201:libxl__xs_read_mandatory: xenstore read failed: `/libxl/1/type': No such file or directory libxl: warning: libxl_dom.c:49:libxl__domain_type: unable to get domain type for domid=1, assuming HVM During a soft_reset, skip calling libxl__cpuid_legacy() to avoid the issue. Before commit 34990446ca91, the libxl__cpuid_legacy() failure would have been ignored, so kexec would continue. Fixes: 34990446ca91 ("libxl: don't ignore the return value from xc_cpuid_apply_policy") Signed-off-by: Jason Andryuk <jandryuk@xxxxxxxxx> Reviewed-by: Anthony PERARD <anthony.perard@xxxxxxxxxx> --- tools/libs/light/libxl_create.c | 2 ++ tools/libs/light/libxl_dom.c | 2 +- tools/libs/light/libxl_internal.h | 1 + 3 files changed, 4 insertions(+), 1 deletion(-) diff --git a/tools/libs/light/libxl_create.c b/tools/libs/light/libxl_create.c index beec3f6b6f..ec8eab02c2 100644 --- a/tools/libs/light/libxl_create.c +++ b/tools/libs/light/libxl_create.c @@ -2207,6 +2207,8 @@ static int do_domain_soft_reset(libxl_ctx *ctx, aop_console_how); cdcs->domid_out = &domid_out; + state->soft_reset = true; + dom_path = libxl__xs_get_dompath(gc, domid); if (!dom_path) { LOGD(ERROR, domid, "failed to read domain path"); diff --git a/tools/libs/light/libxl_dom.c b/tools/libs/light/libxl_dom.c index b454f988fb..f6311eea6e 100644 --- a/tools/libs/light/libxl_dom.c +++ b/tools/libs/light/libxl_dom.c @@ -382,7 +382,7 @@ int libxl__build_pre(libxl__gc *gc, uint32_t domid, /* Construct a CPUID policy, but only for brand new domains. Domains * being migrated-in/restored have CPUID handled during the * static_data_done() callback. */ - if (!state->restore) + if (!state->restore && !state->soft_reset) rc = libxl__cpuid_legacy(ctx, domid, false, info); out: diff --git a/tools/libs/light/libxl_internal.h b/tools/libs/light/libxl_internal.h index 0dc8b8f210..ad982d691a 100644 --- a/tools/libs/light/libxl_internal.h +++ b/tools/libs/light/libxl_internal.h @@ -1411,6 +1411,7 @@ typedef struct { /* Whether this domain is being migrated/restored, or booting fresh. Only * applicable to the primary domain, not support domains (e.g. stub QEMU). */ bool restore; + bool soft_reset; } libxl__domain_build_state; _hidden void libxl__domain_build_state_init(libxl__domain_build_state *s); -- generated by git-patchbot for /home/xen/git/xen.git#master
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