diff options
| author | Janosch Frank | 2022-10-17 10:38:22 +0200 |
|---|---|---|
| committer | Marc-André Lureau | 2022-10-26 10:54:59 +0200 |
| commit | 113d8f4e95cf0450bea421263de6ec016c779ad0 (patch) | |
| tree | e8765ff222d0cb028300aefe855fca592c520646 /dump/dump.c | |
| parent | s390x: Add KVM PV dump interface (diff) | |
| download | qemu-113d8f4e95cf0450bea421263de6ec016c779ad0.tar.gz qemu-113d8f4e95cf0450bea421263de6ec016c779ad0.tar.xz qemu-113d8f4e95cf0450bea421263de6ec016c779ad0.zip | |
s390x: pv: Add dump support
Sometimes dumping a guest from the outside is the only way to get the
data that is needed. This can be the case if a dumping mechanism like
KDUMP hasn't been configured or data needs to be fetched at a specific
point. Dumping a protected guest from the outside without help from
fw/hw doesn't yield sufficient data to be useful. Hence we now
introduce PV dump support.
The PV dump support works by integrating the firmware into the dump
process. New Ultravisor calls are used to initiate the dump process,
dump cpu data, dump memory state and lastly complete the dump process.
The UV calls are exposed by KVM via the new KVM_PV_DUMP command and
its subcommands. The guest's data is fully encrypted and can only be
decrypted by the entity that owns the customer communication key for
the dumped guest. Also dumping needs to be allowed via a flag in the
SE header.
On the QEMU side of things we store the PV dump data in the newly
introduced architecture ELF sections (storage state and completion
data) and the cpu notes (for cpu dump data).
Users can use the zgetdump tool to convert the encrypted QEMU dump to an
unencrypted one.
Signed-off-by: Janosch Frank <frankja@linux.ibm.com>
Reviewed-by: Steffen Eiden <seiden@linux.ibm.com>
Message-Id: <20221017083822.43118-11-frankja@linux.ibm.com>
Diffstat (limited to 'dump/dump.c')
| -rw-r--r-- | dump/dump.c | 12 |
1 files changed, 6 insertions, 6 deletions
diff --git a/dump/dump.c b/dump/dump.c index 9428d1fde9..df117c847f 100644 --- a/dump/dump.c +++ b/dump/dump.c @@ -708,9 +708,9 @@ static void dump_begin(DumpState *s, Error **errp) write_elf_notes(s, errp); } -static int64_t dump_filtered_memblock_size(GuestPhysBlock *block, - int64_t filter_area_start, - int64_t filter_area_length) +int64_t dump_filtered_memblock_size(GuestPhysBlock *block, + int64_t filter_area_start, + int64_t filter_area_length) { int64_t size, left, right; @@ -728,9 +728,9 @@ static int64_t dump_filtered_memblock_size(GuestPhysBlock *block, return size; } -static int64_t dump_filtered_memblock_start(GuestPhysBlock *block, - int64_t filter_area_start, - int64_t filter_area_length) +int64_t dump_filtered_memblock_start(GuestPhysBlock *block, + int64_t filter_area_start, + int64_t filter_area_length) { if (filter_area_length) { /* return -1 if the block is not within filter area */ |