On 12/12/19 1:07 PM, Stefan Berger wrote:
Implement the check whether the emulator backend is suspended.
Signed-off-by: Stefan Berger <stef...@linux.ibm.com>
diff --git a/hw/tpm/tpm_emulator.c b/hw/tpm/tpm_emulator.c
index 22f9113432..7be7d3a91b 100644
--- a/hw/tpm/tpm_emulator.c
+++ b/hw/tpm/tpm_emulator.c
@@ -80,6 +80,8 @@ typedef struct TPMEmulator {
unsigned int established_flag_cached:1;
TPMBlobBuffers state_blobs;
+
+ bool is_suspended;
} TPMEmulator;
struct tpm_error {
@@ -486,6 +488,13 @@ static size_t tpm_emulator_get_buffer_size(TPMBackend *tb)
return actual_size;
}
+static bool tpm_emulator_is_suspended(TPMBackend *tb)
+{
+ TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
+
+ return tpm_emu->is_suspended;
+}
+
static int tpm_emulator_block_migration(TPMEmulator *tpm_emu)
{
Error *err = NULL;
@@ -846,6 +855,8 @@ static int tpm_emulator_pre_save(void *opaque)
TPMBackend *tb = opaque;
TPMEmulator *tpm_emu = TPM_EMULATOR(tb);
+ tpm_emu->is_suspended = true;
This is the most critical part here. It must be true when we receive a
response in the tpm_spapr_request_completed(). The problem is that what
tpm_backend_finish_sync() does is not specific to this backend but more
a global operation that another device could run as well -- none seem to
do this today. So the point is that there could be a race here. This
flag should really be set in '.pre_pre_save,' so before any other device
could poll. Better would be calling a global function that indicates
whether device suspension has started. In this case we could do away
with this and just call that function from the spapr device.
