When using the extended request format we can instruct the hypervisor to
provision enough space for requested XSAVE features. This is required
for supporting QEMU models provided via the -cpu flag properly.
Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com>
Acked-by: Wei Liu <wei.liu@kernel.org>
---
accel/mshv/mshv-all.c | 71 ++++++++++--
include/hw/hyperv/hvgdk_mini.h | 2 +
include/hw/hyperv/hvhdk.h | 195 +++++++++++++++++++++++++++++++++
3 files changed, 261 insertions(+), 7 deletions(-)
diff --git a/accel/mshv/mshv-all.c b/accel/mshv/mshv-all.c
index d4cc7f5371..c50641f174 100644
--- a/accel/mshv/mshv-all.c
+++ b/accel/mshv/mshv-all.c
@@ -110,21 +110,78 @@ static int resume_vm(int vm_fd)
return 0;
}
+static int get_host_partition_property(int mshv_fd, uint32_t property_code,
+ uint64_t *value)
+{
+ int ret;
+ struct hv_input_get_partition_property in = {0};
+ struct hv_output_get_partition_property out = {0};
+ struct mshv_root_hvcall args = {0};
+
+ in.property_code = property_code;
+
+ args.code = HVCALL_GET_PARTITION_PROPERTY;
+ args.in_sz = sizeof(in);
+ args.in_ptr = (uint64_t)∈
+ args.out_sz = sizeof(out);
+ args.out_ptr = (uint64_t)&out;
+
+ ret = ioctl(mshv_fd, MSHV_ROOT_HVCALL, &args);
+ if (ret < 0) {
+ error_report("Failed to get host partition property bank: %s",
+ strerror(errno));
+ return -1;
+ }
+
+ *value = out.property_value;
+ return 0;
+}
+
static int create_partition(int mshv_fd, int *vm_fd)
{
int ret;
- struct mshv_create_partition args = {0};
+ uint64_t pt_flags, host_proc_features;
+ union hv_partition_processor_xsave_features disabled_xsave_features;
+ struct mshv_create_partition_v2 args = {0};
+
+ QEMU_BUILD_BUG_ON(MSHV_NUM_CPU_FEATURES_BANKS != 2);
/* Initialize pt_flags with the desired features */
- uint64_t pt_flags = (1ULL << MSHV_PT_BIT_LAPIC) |
- (1ULL << MSHV_PT_BIT_X2APIC) |
- (1ULL << MSHV_PT_BIT_GPA_SUPER_PAGES);
+ pt_flags = (1ULL << MSHV_PT_BIT_LAPIC) |
+ (1ULL << MSHV_PT_BIT_X2APIC) |
+ (1ULL << MSHV_PT_BIT_GPA_SUPER_PAGES) |
+ (1ULL << MSHV_PT_BIT_CPU_AND_XSAVE_FEATURES);
+
+ /* enable all */
+ disabled_xsave_features.as_uint64 = 0;
+
+ /*
+ * query host for supported processor features and disable unsupported
+ * features: (0 means supported, 1 means disabled, hence the negation)
+ */
+ ret = get_host_partition_property(mshv_fd,
+ HV_PARTITION_PROPERTY_PROCESSOR_FEATURES0,
+ &host_proc_features);
+ if (ret < 0) {
+ error_report("Failed to get host processor feature bank 0");
+ return -1;
+ }
+ args.pt_cpu_fbanks[0] = ~host_proc_features;
- /* Set default isolation type */
- uint64_t pt_isolation = MSHV_PT_ISOLATION_NONE;
+ ret = get_host_partition_property(mshv_fd,
+ HV_PARTITION_PROPERTY_PROCESSOR_FEATURES1,
+ &host_proc_features);
+ if (ret < 0) {
+ error_report("Failed to get host processor feature bank 1");
+ return -1;
+ }
+ args.pt_cpu_fbanks[1] = ~host_proc_features;
+ /* populate args structure */
args.pt_flags = pt_flags;
- args.pt_isolation = pt_isolation;
+ args.pt_isolation = MSHV_PT_ISOLATION_NONE;
+ args.pt_disabled_xsave = disabled_xsave_features.as_uint64;
+ args.pt_num_cpu_fbanks = MSHV_NUM_CPU_FEATURES_BANKS;
ret = ioctl(mshv_fd, MSHV_CREATE_PARTITION, &args);
if (ret < 0) {
diff --git a/include/hw/hyperv/hvgdk_mini.h b/include/hw/hyperv/hvgdk_mini.h
index cb52cc9de2..f5fa1301fb 100644
--- a/include/hw/hyperv/hvgdk_mini.h
+++ b/include/hw/hyperv/hvgdk_mini.h
@@ -450,6 +450,8 @@ typedef struct hv_input_set_vp_registers {
struct hv_register_assoc elements[];
} hv_input_set_vp_registers;
+#define MSHV_VP_MAX_REGISTERS 128
+
union hv_interrupt_control {
uint64_t as_uint64;
struct {
diff --git a/include/hw/hyperv/hvhdk.h b/include/hw/hyperv/hvhdk.h
index 866c8211bf..c0ce48e605 100644
--- a/include/hw/hyperv/hvhdk.h
+++ b/include/hw/hyperv/hvhdk.h
@@ -11,6 +11,16 @@
#define HV_PARTITION_SYNTHETIC_PROCESSOR_FEATURES_BANKS 1
+struct hv_input_get_partition_property {
+ uint64_t partition_id;
+ uint32_t property_code; /* enum hv_partition_property_code */
+ uint32_t padding;
+} QEMU_PACKED;
+
+struct hv_output_get_partition_property {
+ uint64_t property_value;
+} QEMU_PACKED;
+
struct hv_input_set_partition_property {
uint64_t partition_id;
uint32_t property_code; /* enum hv_partition_property_code */
@@ -161,6 +171,191 @@ union hv_partition_synthetic_processor_features {
};
};
+union hv_partition_processor_xsave_features {
+ struct {
+ uint64_t xsave_support:1;
+ uint64_t xsaveopt_support:1;
+ uint64_t avx_support:1;
+ uint64_t avx2_support:1;
+ uint64_t fma_support:1;
+ uint64_t mpx_support:1;
+ uint64_t avx512_support:1;
+ uint64_t avx512_dq_support:1;
+ uint64_t avx512_cd_support:1;
+ uint64_t avx512_bw_support:1;
+ uint64_t avx512_vl_support:1;
+ uint64_t xsave_comp_support:1;
+ uint64_t xsave_supervisor_support:1;
+ uint64_t xcr1_support:1;
+ uint64_t avx512_bitalg_support:1;
+ uint64_t avx512_i_fma_support:1;
+ uint64_t avx512_v_bmi_support:1;
+ uint64_t avx512_v_bmi2_support:1;
+ uint64_t avx512_vnni_support:1;
+ uint64_t gfni_support:1;
+ uint64_t vaes_support:1;
+ uint64_t avx512_v_popcntdq_support:1;
+ uint64_t vpclmulqdq_support:1;
+ uint64_t avx512_bf16_support:1;
+ uint64_t avx512_vp2_intersect_support:1;
+ uint64_t avx512_fp16_support:1;
+ uint64_t xfd_support:1;
+ uint64_t amx_tile_support:1;
+ uint64_t amx_bf16_support:1;
+ uint64_t amx_int8_support:1;
+ uint64_t avx_vnni_support:1;
+ uint64_t avx_ifma_support:1;
+ uint64_t avx_ne_convert_support:1;
+ uint64_t avx_vnni_int8_support:1;
+ uint64_t avx_vnni_int16_support:1;
+ uint64_t avx10_1_256_support:1;
+ uint64_t avx10_1_512_support:1;
+ uint64_t amx_fp16_support:1;
+ uint64_t reserved1:26;
+ };
+ uint64_t as_uint64;
+};
+
+#define HV_PARTITION_PROCESSOR_FEATURES_BANKS 2
+#define HV_PARTITION_PROCESSOR_FEATURES_RESERVEDBANK1_BITFIELD_COUNT 4
+
+
+union hv_partition_processor_features {
+ uint64_t as_uint64[HV_PARTITION_PROCESSOR_FEATURES_BANKS];
+ struct {
+ uint64_t sse3_support:1;
+ uint64_t lahf_sahf_support:1;
+ uint64_t ssse3_support:1;
+ uint64_t sse4_1_support:1;
+ uint64_t sse4_2_support:1;
+ uint64_t sse4a_support:1;
+ uint64_t xop_support:1;
+ uint64_t pop_cnt_support:1;
+ uint64_t cmpxchg16b_support:1;
+ uint64_t altmovcr8_support:1;
+ uint64_t lzcnt_support:1;
+ uint64_t mis_align_sse_support:1;
+ uint64_t mmx_ext_support:1;
+ uint64_t amd3dnow_support:1;
+ uint64_t extended_amd3dnow_support:1;
+ uint64_t page_1gb_support:1;
+ uint64_t aes_support:1;
+ uint64_t pclmulqdq_support:1;
+ uint64_t pcid_support:1;
+ uint64_t fma4_support:1;
+ uint64_t f16c_support:1;
+ uint64_t rd_rand_support:1;
+ uint64_t rd_wr_fs_gs_support:1;
+ uint64_t smep_support:1;
+ uint64_t enhanced_fast_string_support:1;
+ uint64_t bmi1_support:1;
+ uint64_t bmi2_support:1;
+ uint64_t hle_support_deprecated:1;
+ uint64_t rtm_support_deprecated:1;
+ uint64_t movbe_support:1;
+ uint64_t npiep1_support:1;
+ uint64_t dep_x87_fpu_save_support:1;
+ uint64_t rd_seed_support:1;
+ uint64_t adx_support:1;
+ uint64_t intel_prefetch_support:1;
+ uint64_t smap_support:1;
+ uint64_t hle_support:1;
+ uint64_t rtm_support:1;
+ uint64_t rdtscp_support:1;
+ uint64_t clflushopt_support:1;
+ uint64_t clwb_support:1;
+ uint64_t sha_support:1;
+ uint64_t x87_pointers_saved_support:1;
+ uint64_t invpcid_support:1;
+ uint64_t ibrs_support:1;
+ uint64_t stibp_support:1;
+ uint64_t ibpb_support:1;
+ uint64_t unrestricted_guest_support:1;
+ uint64_t mdd_support:1;
+ uint64_t fast_short_rep_mov_support:1;
+ uint64_t l1dcache_flush_support:1;
+ uint64_t rdcl_no_support:1;
+ uint64_t ibrs_all_support:1;
+ uint64_t skip_l1df_support:1;
+ uint64_t ssb_no_support:1;
+ uint64_t rsb_a_no_support:1;
+ uint64_t virt_spec_ctrl_support:1;
+ uint64_t rd_pid_support:1;
+ uint64_t umip_support:1;
+ uint64_t mbs_no_support:1;
+ uint64_t mb_clear_support:1;
+ uint64_t taa_no_support:1;
+ uint64_t tsx_ctrl_support:1;
+ uint64_t reserved_bank0:1;
+
+ /* N.B. Begin bank 1 processor features. */
+ uint64_t a_count_m_count_support:1;
+ uint64_t tsc_invariant_support:1;
+ uint64_t cl_zero_support:1;
+ uint64_t rdpru_support:1;
+ uint64_t la57_support:1;
+ uint64_t mbec_support:1;
+ uint64_t nested_virt_support:1;
+ uint64_t psfd_support:1;
+ uint64_t cet_ss_support:1;
+ uint64_t cet_ibt_support:1;
+ uint64_t vmx_exception_inject_support:1;
+ uint64_t enqcmd_support:1;
+ uint64_t umwait_tpause_support:1;
+ uint64_t movdiri_support:1;
+ uint64_t movdir64b_support:1;
+ uint64_t cldemote_support:1;
+ uint64_t serialize_support:1;
+ uint64_t tsc_deadline_tmr_support:1;
+ uint64_t tsc_adjust_support:1;
+ uint64_t fzl_rep_movsb:1;
+ uint64_t fs_rep_stosb:1;
+ uint64_t fs_rep_cmpsb:1;
+ uint64_t tsx_ld_trk_support:1;
+ uint64_t vmx_ins_outs_exit_info_support:1;
+ uint64_t hlat_support:1;
+ uint64_t sbdr_ssdp_no_support:1;
+ uint64_t fbsdp_no_support:1;
+ uint64_t psdp_no_support:1;
+ uint64_t fb_clear_support:1;
+ uint64_t btc_no_support:1;
+ uint64_t ibpb_rsb_flush_support:1;
+ uint64_t stibp_always_on_support:1;
+ uint64_t perf_global_ctrl_support:1;
+ uint64_t npt_execute_only_support:1;
+ uint64_t npt_ad_flags_support:1;
+ uint64_t npt1_gb_page_support:1;
+ uint64_t amd_processor_topology_node_id_support:1;
+ uint64_t local_machine_check_support:1;
+ uint64_t extended_topology_leaf_fp256_amd_support:1;
+ uint64_t gds_no_support:1;
+ uint64_t cmpccxadd_support:1;
+ uint64_t tsc_aux_virtualization_support:1;
+ uint64_t rmp_query_support:1;
+ uint64_t bhi_no_support:1;
+ uint64_t bhi_dis_support:1;
+ uint64_t prefetch_i_support:1;
+ uint64_t sha512_support:1;
+ uint64_t mitigation_ctrl_support:1;
+ uint64_t rfds_no_support:1;
+ uint64_t rfds_clear_support:1;
+ uint64_t sm3_support:1;
+ uint64_t sm4_support:1;
+ uint64_t secure_avic_support:1;
+ uint64_t guest_intercept_ctrl_support:1;
+ uint64_t sbpb_supported:1;
+ uint64_t ibpb_br_type_supported:1;
+ uint64_t srso_no_supported:1;
+ uint64_t srso_user_kernel_no_supported:1;
+ uint64_t vrew_clear_supported:1;
+ uint64_t tsa_l1_no_supported:1;
+ uint64_t tsa_sq_no_supported:1;
+ uint64_t lass_support:1;
+ uint64_t idle_hlt_intercept_support:1;
+ uint64_t msr_list_support:1;
+ };
+};
+
enum hv_translate_gva_result_code {
HV_TRANSLATE_GVA_SUCCESS = 0,
--
2.34.1On Mon, Mar 23, 2026 at 12:57:03PM +0100, Magnus Kulke wrote: > When using the extended request format we can instruct the hypervisor to > provision enough space for requested XSAVE features. This is required > for supporting QEMU models provided via the -cpu flag properly. > > Signed-off-by: Magnus Kulke <magnuskulke@linux.microsoft.com> > Acked-by: Wei Liu <wei.liu@kernel.org> > --- > accel/mshv/mshv-all.c | 71 ++++++++++-- > include/hw/hyperv/hvgdk_mini.h | 2 + > include/hw/hyperv/hvhdk.h | 195 +++++++++++++++++++++++++++++++++ > 3 files changed, 261 insertions(+), 7 deletions(-) Reviewed-by: Anirudh Rayabharam (Microsoft) <anirudh@anirudhrb.com>
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