For some vhostuser daemons, we validate that the guest memory is shared with the host. With earlier versions of QEMU, it was only possible to mark memory as shared by defining an explicit NUMA topology. Later, QEMU exposed the name of the default memory backend (defaultRAMid) so we can mark that memory as shared. Since libvirt commit: commit bff2ad5d6b1f25da02802273934d2a519159fec7 qemu: Relax validation for mem->access if guest has no NUMA we already check for the case when user requests shared memory, but QEMU did not expose defaultRAMid. Drop the duplicit check from vhostuser device validation, to make it pass on hotplug even after libvirtd restart. This avoids the need to store the defaultRAMid, since we don't really need it for anything after the VM has been already started. https://bugzilla.redhat.com/show_bug.cgi?id=2078693 https://bugzilla.redhat.com/show_bug.cgi?id=2177701 Signed-off-by: Ján Tomko <jtomko(a)redhat.com&gt; --- src/qemu/qemu_validate.c | 5 ++--- 1 file changed, 2 insertions(+), 3 deletions(-) diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c index 0146220d8f..f750684414 100644 --- a/src/qemu/qemu_validate.c +++ b/src/qemu/qemu_validate.c @@ -1782,7 +1782,7 @@ qemuValidateNetSupportsCoalesce(virDomainNetType type) static int qemuValidateDomainDefVhostUserRequireSharedMemory(const virDomainDef *def, const char *name, - virQEMUCaps *qemuCaps) + virQEMUCaps *qemuCaps G_GNUC_UNUSED) { const char *defaultRAMId = virQEMUCapsGetMachineDefaultRAMid(qemuCaps, def->virtType, @@ -1790,8 +1790,7 @@ qemuValidateDomainDefVhostUserRequireSharedMemory(const virDomainDef *def, size_t numa_nodes = virDomainNumaGetNodeCount(def->numa); size_t i; - if (numa_nodes == 0 && - !(defaultRAMId && def->mem.access == VIR_DOMAIN_MEMORY_ACCESS_SHARED)) { + if (numa_nodes == 0 && def->mem.access != VIR_DOMAIN_MEMORY_ACCESS_SHARED) { virReportError(VIR_ERR_CONFIG_UNSUPPORTED, _("'%s' requires shared memory"), name); return -1; -- 2.39.2

Signed-off-by: Ján Tomko <jtomko(a)redhat.com&gt; --- src/qemu/qemu_validate.c | 12 +++--------- 1 file changed, 3 insertions(+), 9 deletions(-) diff --git a/src/qemu/qemu_validate.c b/src/qemu/qemu_validate.c index f750684414..d6aa2a58ab 100644 --- a/src/qemu/qemu_validate.c +++ b/src/qemu/qemu_validate.c @@ -1781,12 +1781,8 @@ qemuValidateNetSupportsCoalesce(virDomainNetType type) */ static int qemuValidateDomainDefVhostUserRequireSharedMemory(const virDomainDef *def, - const char *name, - virQEMUCaps *qemuCaps G_GNUC_UNUSED) + const char *name) { - const char *defaultRAMId = virQEMUCapsGetMachineDefaultRAMid(qemuCaps, - def->virtType, - def->os.machine); size_t numa_nodes = virDomainNumaGetNodeCount(def->numa); size_t i; @@ -3357,8 +3353,7 @@ qemuValidateDomainDeviceDefDisk(const virDomainDiskDef *disk, return -1; } - if (qemuValidateDomainDefVhostUserRequireSharedMemory(def, "vhostuser", - qemuCaps) < 0) { + if (qemuValidateDomainDefVhostUserRequireSharedMemory(def, "vhostuser") < 0) { return -1; } } @@ -4524,8 +4519,7 @@ qemuValidateDomainDeviceDefFS(virDomainFSDef *fs, _("virtiofs does not support fmode and dmode")); return -1; } - if (qemuValidateDomainDefVhostUserRequireSharedMemory(def, "virtiofs", - qemuCaps) < 0) { + if (qemuValidateDomainDefVhostUserRequireSharedMemory(def, "virtiofs") < 0) { return -1; } if (fs->info.bootIndex && -- 2.39.2