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45aa4c1d2a
New virHostMemGetTHPSize() is introduced which allows caller to
obtain THP PMD (Page Middle Directory) size, which is equal to
the minimal size that THP can use, taken from kernel doc
(Documentation/admin-guide/mm/transhuge.rst):
Some userspace (such as a test program, or an optimized memory allocation
library) may want to know the size (in bytes) of a transparent hugepage::
cat /sys/kernel/mm/transparent_hugepage/hpage_pmd_size
Since this size depends on the host architecture and the kernel
it won't change whilst libvirtd is running. Therefore, we can use
virOnce() and cache the value. Of course, we can be running under
kernel that has THP disabled or has no notion of THP at all. In
that case a negative value is returned to signal error.
Signed-off-by: Michal Privoznik <mprivozn@redhat.com>
Reviewed-by: Ján Tomko <jtomko@redhat.com>
63 lines
1.6 KiB
C
63 lines
1.6 KiB
C
/*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2.1 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library. If not, see
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* <http://www.gnu.org/licenses/>.
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*/
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#include <config.h>
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#include "virhostcpu.h"
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#include "virhostmem.h"
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#if WITH_QEMU
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# include "virmock.h"
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# include "qemu/qemu_capabilities.h"
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#endif
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int
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virHostCPUGetKVMMaxVCPUs(void)
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{
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return INT_MAX;
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}
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unsigned int
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virHostCPUGetMicrocodeVersion(virArch hostArch G_GNUC_UNUSED)
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{
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return 0;
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}
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#if WITH_QEMU
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static bool (*real_virQEMUCapsGetKVMSupportsSecureGuest)(virQEMUCaps *qemuCaps);
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bool
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virQEMUCapsGetKVMSupportsSecureGuest(virQEMUCaps *qemuCaps)
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{
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if (virQEMUCapsGet(qemuCaps, QEMU_CAPS_MACHINE_CONFIDENTAL_GUEST_SUPPORT) &&
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virQEMUCapsGet(qemuCaps, QEMU_CAPS_S390_PV_GUEST))
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return true;
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if (!real_virQEMUCapsGetKVMSupportsSecureGuest)
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VIR_MOCK_REAL_INIT(virQEMUCapsGetKVMSupportsSecureGuest);
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return real_virQEMUCapsGetKVMSupportsSecureGuest(qemuCaps);
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}
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#endif
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int
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virHostMemGetTHPSize(unsigned long long *size)
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{
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/* Pretend Transparent Huge Page size is 2MiB. */
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*size = 2048;
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return 0;
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}
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