[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v7 04/10] xen/memory: Add a vmtrace_buf resource type
From: Michał Leszczyński <michal.leszczynski@xxxxxxx> Allow to map processor trace buffer using acquire_resource(). Signed-off-by: Michał Leszczyński <michal.leszczynski@xxxxxxx> Signed-off-by: Andrew Cooper <andrew.cooper3@xxxxxxxxxx> --- CC: Jan Beulich <JBeulich@xxxxxxxx> CC: Roger Pau Monné <roger.pau@xxxxxxxxxx> CC: Wei Liu <wl@xxxxxxx> CC: Michał Leszczyński <michal.leszczynski@xxxxxxx> CC: Tamas K Lengyel <tamas@xxxxxxxxxxxxx> v7: * Rebase over changes elsewhere in the series --- xen/common/memory.c | 27 +++++++++++++++++++++++++++ xen/include/public/memory.h | 1 + 2 files changed, 28 insertions(+) diff --git a/xen/common/memory.c b/xen/common/memory.c index c89923d909..ec6a55172a 100644 --- a/xen/common/memory.c +++ b/xen/common/memory.c @@ -1068,11 +1068,35 @@ static unsigned int resource_max_frames(const struct domain *d, case XENMEM_resource_grant_table: return gnttab_resource_max_frames(d, id); + case XENMEM_resource_vmtrace_buf: + return d->vmtrace_frames; + default: return arch_resource_max_frames(d, type, id); } } +static int acquire_vmtrace_buf( + struct domain *d, unsigned int id, unsigned long frame, + unsigned int nr_frames, xen_pfn_t mfn_list[]) +{ + const struct vcpu *v = domain_vcpu(d, id); + unsigned int i; + mfn_t mfn; + + if ( !v || !v->vmtrace.buf || + nr_frames > d->vmtrace_frames || + (frame + nr_frames) > d->vmtrace_frames ) + return -EINVAL; + + mfn = page_to_mfn(v->vmtrace.buf); + + for ( i = 0; i < nr_frames; i++ ) + mfn_list[i] = mfn_x(mfn) + frame + i; + + return nr_frames; +} + /* * Returns -errno on error, or positive in the range [1, nr_frames] on * success. Returning less than nr_frames contitutes a request for a @@ -1087,6 +1111,9 @@ static int _acquire_resource( case XENMEM_resource_grant_table: return gnttab_acquire_resource(d, id, frame, nr_frames, mfn_list); + case XENMEM_resource_vmtrace_buf: + return acquire_vmtrace_buf(d, id, frame, nr_frames, mfn_list); + default: return arch_acquire_resource(d, type, id, frame, nr_frames, mfn_list); } diff --git a/xen/include/public/memory.h b/xen/include/public/memory.h index c4c47a0b38..b0378bb14b 100644 --- a/xen/include/public/memory.h +++ b/xen/include/public/memory.h @@ -625,6 +625,7 @@ struct xen_mem_acquire_resource { #define XENMEM_resource_ioreq_server 0 #define XENMEM_resource_grant_table 1 +#define XENMEM_resource_vmtrace_buf 2 /* * IN - a type-specific resource identifier, which must be zero -- 2.11.0
|
Lists.xenproject.org is hosted with RackSpace, monitoring our |