| Message ID | 1588533678-23450-6-git-send-email-raphael.norwitz@nutanix.com (mailing list archive) |
|---|---|
| State | New, archived |
| Headers | show |
| Series | vhost-user: Lift Max Ram Slots Limitation | expand |
On Thu, May 21, 2020 at 7:00 AM Raphael Norwitz <raphael.norwitz@nutanix.com> wrote: > Historically, sending all memory regions to vhost-user backends in a > single message imposed a limitation on the number of times memory > could be hot-added to a VM with a vhost-user device. Now that backends > which support the VHOST_USER_PROTOCOL_F_CONFIGURE_SLOTS send memory > regions individually, we no longer need to impose this limitation on > devices which support this feature. > > With this change, VMs with a vhost-user device which supports the > VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS can support a configurable > number of memory slots, up to the maximum allowed by the target > platform. > > Existing backends which do not support > VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS are unaffected. > > Signed-off-by: Raphael Norwitz <raphael.norwitz@nutanix.com> > Signed-off-by: Peter Turschmid <peter.turschm@nutanix.com> > Suggested-by: Mike Cui <cui@nutanix.com> > Reviewed-by: Marc-André Lureau <marcandre.lureau@redhat.com> --- > docs/interop/vhost-user.rst | 7 +++--- > hw/virtio/vhost-user.c | 56 > ++++++++++++++++++++++++++++++--------------- > 2 files changed, 40 insertions(+), 23 deletions(-) > > diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst > index 037eefa..688b7c6 100644 > --- a/docs/interop/vhost-user.rst > +++ b/docs/interop/vhost-user.rst > @@ -1273,10 +1273,9 @@ Master message types > feature has been successfully negotiated, this message is submitted > by master to the slave. The slave should return the message with a > u64 payload containing the maximum number of memory slots for > - QEMU to expose to the guest. At this point, the value returned > - by the backend will be capped at the maximum number of ram slots > - which can be supported by vhost-user. Currently that limit is set > - at VHOST_USER_MAX_RAM_SLOTS = 8. > + QEMU to expose to the guest. The value returned by the backend > + will be capped at the maximum number of ram slots which can be > + supported by the target platform. > > ``VHOST_USER_ADD_MEM_REG`` > :id: 37 > diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c > index 9358406..48b8081 100644 > --- a/hw/virtio/vhost-user.c > +++ b/hw/virtio/vhost-user.c > @@ -35,11 +35,29 @@ > #include <linux/userfaultfd.h> > #endif > > -#define VHOST_MEMORY_MAX_NREGIONS 8 > +#define VHOST_MEMORY_BASELINE_NREGIONS 8 > #define VHOST_USER_F_PROTOCOL_FEATURES 30 > #define VHOST_USER_SLAVE_MAX_FDS 8 > > /* > + * Set maximum number of RAM slots supported to > + * the maximum number supported by the target > + * hardware plaform. > + */ > +#if defined(TARGET_X86) || defined(TARGET_X86_64) || \ > + defined(TARGET_ARM) || defined(TARGET_ARM_64) > +#include "hw/acpi/acpi.h" > +#define VHOST_USER_MAX_RAM_SLOTS ACPI_MAX_RAM_SLOTS > + > +#elif defined(TARGET_PPC) || defined(TARGET_PPC_64) > +#include "hw/ppc/spapr.h" > +#define VHOST_USER_MAX_RAM_SLOTS SPAPR_MAX_RAM_SLOTS > + > +#else > +#define VHOST_USER_MAX_RAM_SLOTS 512 > +#endif > + > +/* > * Maximum size of virtio device config space > */ > #define VHOST_USER_MAX_CONFIG_SIZE 256 > @@ -127,7 +145,7 @@ typedef struct VhostUserMemoryRegion { > typedef struct VhostUserMemory { > uint32_t nregions; > uint32_t padding; > - VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS]; > + VhostUserMemoryRegion regions[VHOST_MEMORY_BASELINE_NREGIONS]; > } VhostUserMemory; > > typedef struct VhostUserMemRegMsg { > @@ -222,7 +240,7 @@ struct vhost_user { > int slave_fd; > NotifierWithReturn postcopy_notifier; > struct PostCopyFD postcopy_fd; > - uint64_t postcopy_client_bases[VHOST_MEMORY_MAX_NREGIONS]; > + uint64_t postcopy_client_bases[VHOST_USER_MAX_RAM_SLOTS]; > /* Length of the region_rb and region_rb_offset arrays */ > size_t region_rb_len; > /* RAMBlock associated with a given region */ > @@ -237,7 +255,7 @@ struct vhost_user { > > /* Our current regions */ > int num_shadow_regions; > - struct vhost_memory_region shadow_regions[VHOST_MEMORY_MAX_NREGIONS]; > + struct vhost_memory_region shadow_regions[VHOST_USER_MAX_RAM_SLOTS]; > }; > > struct scrub_regions { > @@ -392,7 +410,7 @@ int vhost_user_gpu_set_socket(struct vhost_dev *dev, > int fd) > static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, > struct vhost_log *log) > { > - int fds[VHOST_MEMORY_MAX_NREGIONS]; > + int fds[VHOST_USER_MAX_RAM_SLOTS]; > size_t fd_num = 0; > bool shmfd = virtio_has_feature(dev->protocol_features, > VHOST_USER_PROTOCOL_F_LOG_SHMFD); > @@ -470,7 +488,7 @@ static int vhost_user_fill_set_mem_table_msg(struct > vhost_user *u, > mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); > if (fd > 0) { > if (track_ramblocks) { > - assert(*fd_num < VHOST_MEMORY_MAX_NREGIONS); > + assert(*fd_num < VHOST_MEMORY_BASELINE_NREGIONS); > trace_vhost_user_set_mem_table_withfd(*fd_num, mr->name, > reg->memory_size, > > reg->guest_phys_addr, > @@ -478,7 +496,7 @@ static int vhost_user_fill_set_mem_table_msg(struct > vhost_user *u, > offset); > u->region_rb_offset[i] = offset; > u->region_rb[i] = mr->ram_block; > - } else if (*fd_num == VHOST_MEMORY_MAX_NREGIONS) { > + } else if (*fd_num == VHOST_MEMORY_BASELINE_NREGIONS) { > error_report("Failed preparing vhost-user memory table > msg"); > return -1; > } > @@ -523,7 +541,7 @@ static void scrub_shadow_regions(struct vhost_dev *dev, > bool track_ramblocks) > { > struct vhost_user *u = dev->opaque; > - bool found[VHOST_MEMORY_MAX_NREGIONS] = {}; > + bool found[VHOST_USER_MAX_RAM_SLOTS] = {}; > struct vhost_memory_region *reg, *shadow_reg; > int i, j, fd, add_idx = 0, rm_idx = 0, fd_num = 0; > ram_addr_t offset; > @@ -777,9 +795,9 @@ static int vhost_user_add_remove_regions(struct > vhost_dev *dev, > bool track_ramblocks) > { > struct vhost_user *u = dev->opaque; > - struct scrub_regions add_reg[VHOST_MEMORY_MAX_NREGIONS]; > - struct scrub_regions rem_reg[VHOST_MEMORY_MAX_NREGIONS]; > - uint64_t shadow_pcb[VHOST_MEMORY_MAX_NREGIONS] = {}; > + struct scrub_regions add_reg[VHOST_USER_MAX_RAM_SLOTS]; > + struct scrub_regions rem_reg[VHOST_USER_MAX_RAM_SLOTS]; > + uint64_t shadow_pcb[VHOST_USER_MAX_RAM_SLOTS] = {}; > int nr_add_reg, nr_rem_reg; > > msg->hdr.size = sizeof(msg->payload.mem_reg.padding) + > @@ -803,7 +821,7 @@ static int vhost_user_add_remove_regions(struct > vhost_dev *dev, > > if (track_ramblocks) { > memcpy(u->postcopy_client_bases, shadow_pcb, > - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); > + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); > /* > * Now we've registered this with the postcopy code, we ack to the > * client, because now we're in the position to be able to deal > with > @@ -823,7 +841,7 @@ static int vhost_user_add_remove_regions(struct > vhost_dev *dev, > err: > if (track_ramblocks) { > memcpy(u->postcopy_client_bases, shadow_pcb, > - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); > + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); > } > > return -1; > @@ -835,7 +853,7 @@ static int vhost_user_set_mem_table_postcopy(struct > vhost_dev *dev, > bool config_mem_slots) > { > struct vhost_user *u = dev->opaque; > - int fds[VHOST_MEMORY_MAX_NREGIONS]; > + int fds[VHOST_MEMORY_BASELINE_NREGIONS]; > size_t fd_num = 0; > VhostUserMsg msg_reply; > int region_i, msg_i; > @@ -893,7 +911,7 @@ static int vhost_user_set_mem_table_postcopy(struct > vhost_dev *dev, > } > > memset(u->postcopy_client_bases, 0, > - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); > + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); > > /* > * They're in the same order as the regions that were sent > @@ -942,7 +960,7 @@ static int vhost_user_set_mem_table(struct vhost_dev > *dev, > struct vhost_memory *mem) > { > struct vhost_user *u = dev->opaque; > - int fds[VHOST_MEMORY_MAX_NREGIONS]; > + int fds[VHOST_MEMORY_BASELINE_NREGIONS]; > size_t fd_num = 0; > bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler; > bool reply_supported = virtio_has_feature(dev->protocol_features, > @@ -1149,7 +1167,7 @@ static int vhost_set_vring_file(struct vhost_dev > *dev, > VhostUserRequest request, > struct vhost_vring_file *file) > { > - int fds[VHOST_MEMORY_MAX_NREGIONS]; > + int fds[VHOST_USER_MAX_RAM_SLOTS]; > size_t fd_num = 0; > VhostUserMsg msg = { > .hdr.request = request, > @@ -1845,7 +1863,7 @@ static int vhost_user_backend_init(struct vhost_dev > *dev, void *opaque) > /* get max memory regions if backend supports configurable RAM > slots */ > if (!virtio_has_feature(dev->protocol_features, > > VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS)) { > - u->user->memory_slots = VHOST_MEMORY_MAX_NREGIONS; > + u->user->memory_slots = VHOST_MEMORY_BASELINE_NREGIONS; > } else { > err = vhost_user_get_max_memslots(dev, &ram_slots); > if (err < 0) { > @@ -1860,7 +1878,7 @@ static int vhost_user_backend_init(struct vhost_dev > *dev, void *opaque) > return -1; > } > > - u->user->memory_slots = MIN(ram_slots, > VHOST_MEMORY_MAX_NREGIONS); > + u->user->memory_slots = MIN(ram_slots, > VHOST_USER_MAX_RAM_SLOTS); > } > } > > -- > 1.8.3.1 > >
diff --git a/docs/interop/vhost-user.rst b/docs/interop/vhost-user.rst index 037eefa..688b7c6 100644 --- a/docs/interop/vhost-user.rst +++ b/docs/interop/vhost-user.rst @@ -1273,10 +1273,9 @@ Master message types feature has been successfully negotiated, this message is submitted by master to the slave. The slave should return the message with a u64 payload containing the maximum number of memory slots for - QEMU to expose to the guest. At this point, the value returned - by the backend will be capped at the maximum number of ram slots - which can be supported by vhost-user. Currently that limit is set - at VHOST_USER_MAX_RAM_SLOTS = 8. + QEMU to expose to the guest. The value returned by the backend + will be capped at the maximum number of ram slots which can be + supported by the target platform. ``VHOST_USER_ADD_MEM_REG`` :id: 37 diff --git a/hw/virtio/vhost-user.c b/hw/virtio/vhost-user.c index 9358406..48b8081 100644 --- a/hw/virtio/vhost-user.c +++ b/hw/virtio/vhost-user.c @@ -35,11 +35,29 @@ #include <linux/userfaultfd.h> #endif -#define VHOST_MEMORY_MAX_NREGIONS 8 +#define VHOST_MEMORY_BASELINE_NREGIONS 8 #define VHOST_USER_F_PROTOCOL_FEATURES 30 #define VHOST_USER_SLAVE_MAX_FDS 8 /* + * Set maximum number of RAM slots supported to + * the maximum number supported by the target + * hardware plaform. + */ +#if defined(TARGET_X86) || defined(TARGET_X86_64) || \ + defined(TARGET_ARM) || defined(TARGET_ARM_64) +#include "hw/acpi/acpi.h" +#define VHOST_USER_MAX_RAM_SLOTS ACPI_MAX_RAM_SLOTS + +#elif defined(TARGET_PPC) || defined(TARGET_PPC_64) +#include "hw/ppc/spapr.h" +#define VHOST_USER_MAX_RAM_SLOTS SPAPR_MAX_RAM_SLOTS + +#else +#define VHOST_USER_MAX_RAM_SLOTS 512 +#endif + +/* * Maximum size of virtio device config space */ #define VHOST_USER_MAX_CONFIG_SIZE 256 @@ -127,7 +145,7 @@ typedef struct VhostUserMemoryRegion { typedef struct VhostUserMemory { uint32_t nregions; uint32_t padding; - VhostUserMemoryRegion regions[VHOST_MEMORY_MAX_NREGIONS]; + VhostUserMemoryRegion regions[VHOST_MEMORY_BASELINE_NREGIONS]; } VhostUserMemory; typedef struct VhostUserMemRegMsg { @@ -222,7 +240,7 @@ struct vhost_user { int slave_fd; NotifierWithReturn postcopy_notifier; struct PostCopyFD postcopy_fd; - uint64_t postcopy_client_bases[VHOST_MEMORY_MAX_NREGIONS]; + uint64_t postcopy_client_bases[VHOST_USER_MAX_RAM_SLOTS]; /* Length of the region_rb and region_rb_offset arrays */ size_t region_rb_len; /* RAMBlock associated with a given region */ @@ -237,7 +255,7 @@ struct vhost_user { /* Our current regions */ int num_shadow_regions; - struct vhost_memory_region shadow_regions[VHOST_MEMORY_MAX_NREGIONS]; + struct vhost_memory_region shadow_regions[VHOST_USER_MAX_RAM_SLOTS]; }; struct scrub_regions { @@ -392,7 +410,7 @@ int vhost_user_gpu_set_socket(struct vhost_dev *dev, int fd) static int vhost_user_set_log_base(struct vhost_dev *dev, uint64_t base, struct vhost_log *log) { - int fds[VHOST_MEMORY_MAX_NREGIONS]; + int fds[VHOST_USER_MAX_RAM_SLOTS]; size_t fd_num = 0; bool shmfd = virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_LOG_SHMFD); @@ -470,7 +488,7 @@ static int vhost_user_fill_set_mem_table_msg(struct vhost_user *u, mr = vhost_user_get_mr_data(reg->userspace_addr, &offset, &fd); if (fd > 0) { if (track_ramblocks) { - assert(*fd_num < VHOST_MEMORY_MAX_NREGIONS); + assert(*fd_num < VHOST_MEMORY_BASELINE_NREGIONS); trace_vhost_user_set_mem_table_withfd(*fd_num, mr->name, reg->memory_size, reg->guest_phys_addr, @@ -478,7 +496,7 @@ static int vhost_user_fill_set_mem_table_msg(struct vhost_user *u, offset); u->region_rb_offset[i] = offset; u->region_rb[i] = mr->ram_block; - } else if (*fd_num == VHOST_MEMORY_MAX_NREGIONS) { + } else if (*fd_num == VHOST_MEMORY_BASELINE_NREGIONS) { error_report("Failed preparing vhost-user memory table msg"); return -1; } @@ -523,7 +541,7 @@ static void scrub_shadow_regions(struct vhost_dev *dev, bool track_ramblocks) { struct vhost_user *u = dev->opaque; - bool found[VHOST_MEMORY_MAX_NREGIONS] = {}; + bool found[VHOST_USER_MAX_RAM_SLOTS] = {}; struct vhost_memory_region *reg, *shadow_reg; int i, j, fd, add_idx = 0, rm_idx = 0, fd_num = 0; ram_addr_t offset; @@ -777,9 +795,9 @@ static int vhost_user_add_remove_regions(struct vhost_dev *dev, bool track_ramblocks) { struct vhost_user *u = dev->opaque; - struct scrub_regions add_reg[VHOST_MEMORY_MAX_NREGIONS]; - struct scrub_regions rem_reg[VHOST_MEMORY_MAX_NREGIONS]; - uint64_t shadow_pcb[VHOST_MEMORY_MAX_NREGIONS] = {}; + struct scrub_regions add_reg[VHOST_USER_MAX_RAM_SLOTS]; + struct scrub_regions rem_reg[VHOST_USER_MAX_RAM_SLOTS]; + uint64_t shadow_pcb[VHOST_USER_MAX_RAM_SLOTS] = {}; int nr_add_reg, nr_rem_reg; msg->hdr.size = sizeof(msg->payload.mem_reg.padding) + @@ -803,7 +821,7 @@ static int vhost_user_add_remove_regions(struct vhost_dev *dev, if (track_ramblocks) { memcpy(u->postcopy_client_bases, shadow_pcb, - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); /* * Now we've registered this with the postcopy code, we ack to the * client, because now we're in the position to be able to deal with @@ -823,7 +841,7 @@ static int vhost_user_add_remove_regions(struct vhost_dev *dev, err: if (track_ramblocks) { memcpy(u->postcopy_client_bases, shadow_pcb, - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); } return -1; @@ -835,7 +853,7 @@ static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev, bool config_mem_slots) { struct vhost_user *u = dev->opaque; - int fds[VHOST_MEMORY_MAX_NREGIONS]; + int fds[VHOST_MEMORY_BASELINE_NREGIONS]; size_t fd_num = 0; VhostUserMsg msg_reply; int region_i, msg_i; @@ -893,7 +911,7 @@ static int vhost_user_set_mem_table_postcopy(struct vhost_dev *dev, } memset(u->postcopy_client_bases, 0, - sizeof(uint64_t) * VHOST_MEMORY_MAX_NREGIONS); + sizeof(uint64_t) * VHOST_USER_MAX_RAM_SLOTS); /* * They're in the same order as the regions that were sent @@ -942,7 +960,7 @@ static int vhost_user_set_mem_table(struct vhost_dev *dev, struct vhost_memory *mem) { struct vhost_user *u = dev->opaque; - int fds[VHOST_MEMORY_MAX_NREGIONS]; + int fds[VHOST_MEMORY_BASELINE_NREGIONS]; size_t fd_num = 0; bool do_postcopy = u->postcopy_listen && u->postcopy_fd.handler; bool reply_supported = virtio_has_feature(dev->protocol_features, @@ -1149,7 +1167,7 @@ static int vhost_set_vring_file(struct vhost_dev *dev, VhostUserRequest request, struct vhost_vring_file *file) { - int fds[VHOST_MEMORY_MAX_NREGIONS]; + int fds[VHOST_USER_MAX_RAM_SLOTS]; size_t fd_num = 0; VhostUserMsg msg = { .hdr.request = request, @@ -1845,7 +1863,7 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque) /* get max memory regions if backend supports configurable RAM slots */ if (!virtio_has_feature(dev->protocol_features, VHOST_USER_PROTOCOL_F_CONFIGURE_MEM_SLOTS)) { - u->user->memory_slots = VHOST_MEMORY_MAX_NREGIONS; + u->user->memory_slots = VHOST_MEMORY_BASELINE_NREGIONS; } else { err = vhost_user_get_max_memslots(dev, &ram_slots); if (err < 0) { @@ -1860,7 +1878,7 @@ static int vhost_user_backend_init(struct vhost_dev *dev, void *opaque) return -1; } - u->user->memory_slots = MIN(ram_slots, VHOST_MEMORY_MAX_NREGIONS); + u->user->memory_slots = MIN(ram_slots, VHOST_USER_MAX_RAM_SLOTS); } }