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spapr/xive: Rework error handling of kvmppc_xive_mmap() 

Callers currently check failures of kvmppc_xive_mmap() through the
@errp argument, which isn't a recommanded practice. It is preferred
to use a return value when possible.

Since NULL isn't an invalid address in theory, it seems better to
return MAP_FAILED and to teach callers to handle it.

Signed-off-by: Greg Kurz <groug@kaod.org>
Message-Id: <159707845972.1489912.719896767746375765.stgit@bahia.lan>
Signed-off-by: David Gibson <david@gibson.dropbear.id.au>
This commit is contained in:
Greg Kurz 2020-08-10 18:54:19 +02:00 committed by David Gibson
parent 46407a2531
commit b14adb4a27
1 changed files with 11 additions and 7 deletions
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14
hw/intc/spapr_xive_kvm.c
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@ -698,6 +698,7 @@ int kvmppc_xive_post_load(SpaprXive *xive, int version_id)
return 0; return 0;
} }
/* Returns MAP_FAILED on error and sets errno */
static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len, static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
Error **errp) Error **errp)
{ {
@ -708,7 +709,6 @@ static void *kvmppc_xive_mmap(SpaprXive *xive, int pgoff, size_t len,
pgoff << page_shift); pgoff << page_shift);
if (addr == MAP_FAILED) { if (addr == MAP_FAILED) {
error_setg_errno(errp, errno, "XIVE: unable to set memory mapping"); error_setg_errno(errp, errno, "XIVE: unable to set memory mapping");
return NULL;
} }
return addr; return addr;
@ -728,6 +728,7 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
size_t tima_len = 4ull << TM_SHIFT; size_t tima_len = 4ull << TM_SHIFT;
CPUState *cs; CPUState *cs;
int fd; int fd;
void *addr;
/* /*
* The KVM XIVE device already in use. This is the case when * The KVM XIVE device already in use. This is the case when
@ -763,11 +764,12 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
/* /*
* 1. Source ESB pages - KVM mapping * 1. Source ESB pages - KVM mapping
*/ */
xsrc->esb_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len, addr = kvmppc_xive_mmap(xive, KVM_XIVE_ESB_PAGE_OFFSET, esb_len,
&local_err); &local_err);
if (local_err) { if (addr == MAP_FAILED) {
goto fail; goto fail;
} }
xsrc->esb_mmap = addr;
memory_region_init_ram_device_ptr(&xsrc->esb_mmio_kvm, OBJECT(xsrc), memory_region_init_ram_device_ptr(&xsrc->esb_mmio_kvm, OBJECT(xsrc),
"xive.esb-kvm", esb_len, xsrc->esb_mmap); "xive.esb-kvm", esb_len, xsrc->esb_mmap);
@ -781,11 +783,13 @@ int kvmppc_xive_connect(SpaprInterruptController *intc, uint32_t nr_servers,
/* /*
* 3. TIMA pages - KVM mapping * 3. TIMA pages - KVM mapping
*/ */
xive->tm_mmap = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len, addr = kvmppc_xive_mmap(xive, KVM_XIVE_TIMA_PAGE_OFFSET, tima_len,
&local_err); &local_err);
if (local_err) { if (addr == MAP_FAILED) {
goto fail; goto fail;
} }
xive->tm_mmap = addr;
memory_region_init_ram_device_ptr(&xive->tm_mmio_kvm, OBJECT(xive), memory_region_init_ram_device_ptr(&xive->tm_mmio_kvm, OBJECT(xive),
"xive.tima", tima_len, xive->tm_mmap); "xive.tima", tima_len, xive->tm_mmap);
memory_region_add_subregion_overlap(&xive->tm_mmio, 0, memory_region_add_subregion_overlap(&xive->tm_mmio, 0,