[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [Xen-devel] [PATCH 2/2] microcode: Check whether the microcode is correct.
We do the microcode code update in two steps - the presmp: 'microcode_presmp_init' and when CPUs are brought up: 'microcode_init'. The earlier performs the microcode update on the BSP - but unfortunately it does not check whether the update failed. Which means that we might try later to update a incorrect payload on the rest of CPUs. This patch handles this odd situation. Signed-off-by: Konrad Rzeszutek Wilk <konrad.wilk@xxxxxxxxxx> [v2: Redid it as we are not doing scan and <index> at the same time] --- xen/arch/x86/microcode.c | 16 +++++++++++++++- 1 file changed, 15 insertions(+), 1 deletion(-) diff --git a/xen/arch/x86/microcode.c b/xen/arch/x86/microcode.c index e6344cf..ce2fe50 100644 --- a/xen/arch/x86/microcode.c +++ b/xen/arch/x86/microcode.c @@ -418,6 +418,7 @@ static int __init microcode_presmp_init(void) { void *data; size_t len; + int rc = 0; if ( ucode_blob.size ) { @@ -430,10 +431,23 @@ static int __init microcode_presmp_init(void) data = ucode_mod_map(&ucode_mod); } if ( data ) - microcode_update_cpu(data, len); + rc = microcode_update_cpu(data, len); + else + rc = -ENOMEM; if ( !ucode_blob.size ) ucode_mod_map(NULL); + + if ( rc ) + { + if ( ucode_blob.size ) + { + xfree(ucode_blob.data); + ucode_blob.size = 0; + ucode_blob.data = NULL; + } else + ucode_mod.mod_end = 0; + } } register_cpu_notifier(µcode_percpu_nfb); -- 1.8.3.1 _______________________________________________ Xen-devel mailing list Xen-devel@xxxxxxxxxxxxx http://lists.xen.org/xen-devel
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