Re: [libvirt PATCH 36/39] cpu_x86: Add support for stepping part of CPU signature

CPU models defined in the cpu_map can use signature/@stepping attribute to match a limited set of stepping numbers. The value is a bitmap for bits 0..15 each corresponding to a single stepping value. For example, stepping='4-6,9' will match 4, 5, 6, and 9. Omitting the attribute is equivalent to stepping='0-15'. Signed-off-by: Jiri Denemark <jdenemar(a)redhat.com&gt; --- src/cpu/cpu_x86.c | 60 +++++++++++++++++++++++++++++++++++++++-------- 1 file changed, 50 insertions(+), 10 deletions(-) diff --git a/src/cpu/cpu_x86.c b/src/cpu/cpu_x86.c index 51c98efca9..bd224a9d0d 100644 --- a/src/cpu/cpu_x86.c +++ b/src/cpu/cpu_x86.c @@ -125,6 +125,7 @@ typedef struct _virCPUx86Signature virCPUx86Signature; struct _virCPUx86Signature { unsigned int family; unsigned int model; + virBitmapPtr stepping; }; typedef struct _virCPUx86Signatures virCPUx86Signatures; @@ -732,7 +733,17 @@ x86MakeSignature(unsigned int family, static uint32_t virCPUx86SignatureToCPUID(virCPUx86Signature *sig) { - return x86MakeSignature(sig->family, sig->model, 0); + unsigned int stepping = 0; + + if (sig->stepping) { + ssize_t fisrtBit;

+ + fisrtBit = virBitmapNextSetBit(sig->stepping, -1); + if (fisrtBit >= 0) + stepping = fisrtBit; + } + + return x86MakeSignature(sig->family, sig->model, stepping); }