{"id":2216022,"url":"http://patchwork.ozlabs.org/api/patches/2216022/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325164453.72127-15-pbonzini@redhat.com/","project":{"id":14,"url":"http://patchwork.ozlabs.org/api/projects/14/?format=json","name":"QEMU Development","link_name":"qemu-devel","list_id":"qemu-devel.nongnu.org","list_email":"qemu-devel@nongnu.org","web_url":"","scm_url":"","webscm_url":"","list_archive_url":"","list_archive_url_format":"","commit_url_format":""},"msgid":"<20260325164453.72127-15-pbonzini@redhat.com>","list_archive_url":null,"date":"2026-03-25T16:44:48","name":"[PULL,14/19] whpx: i386: fetch segments on-demand","commit_ref":null,"pull_url":null,"state":"new","archived":false,"hash":"41fab9c5edcc5b33c7840783a84484a6aefbf7da","submitter":{"id":2701,"url":"http://patchwork.ozlabs.org/api/people/2701/?format=json","name":"Paolo Bonzini","email":"pbonzini@redhat.com"},"delegate":null,"mbox":"http://patchwork.ozlabs.org/project/qemu-devel/patch/20260325164453.72127-15-pbonzini@redhat.com/mbox/","series":[{"id":497473,"url":"http://patchwork.ozlabs.org/api/series/497473/?format=json","web_url":"http://patchwork.ozlabs.org/project/qemu-devel/list/?series=497473","date":"2026-03-25T16:44:34","name":"[PULL,01/19] tests/functional: preserve PYTHONPATH entries","version":1,"mbox":"http://patchwork.ozlabs.org/series/497473/mbox/"}],"comments":"http://patchwork.ozlabs.org/api/patches/2216022/comments/","check":"pending","checks":"http://patchwork.ozlabs.org/api/patches/2216022/checks/","tags":{},"related":[],"headers":{"Return-Path":"","X-Original-To":"incoming@patchwork.ozlabs.org","Delivered-To":"patchwork-incoming@legolas.ozlabs.org","Authentication-Results":["legolas.ozlabs.org;\n\tdkim=pass (1024-bit key;\n unprotected) header.d=redhat.com header.i=@redhat.com header.a=rsa-sha256\n header.s=mimecast20190719 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DKIM_VALID=-0.1, DKIM_VALID_AU=-0.1, DKIM_VALID_EF=-0.1,\n RCVD_IN_DNSWL_NONE=-0.0001, RCVD_IN_MSPIKE_H3=0.001, RCVD_IN_MSPIKE_WL=0.001,\n RCVD_IN_VALIDITY_RPBL_BLOCKED=0.001, RCVD_IN_VALIDITY_SAFE_BLOCKED=0.001,\n SPF_HELO_PASS=-0.001, SPF_PASS=-0.001 autolearn=ham autolearn_force=no","X-Spam_action":"no action","X-BeenThere":"qemu-devel@nongnu.org","X-Mailman-Version":"2.1.29","Precedence":"list","List-Id":"qemu development ","List-Unsubscribe":",\n ","List-Archive":"","List-Post":"","List-Help":"","List-Subscribe":",\n ","Errors-To":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org","Sender":"qemu-devel-bounces+incoming=patchwork.ozlabs.org@nongnu.org"},"content":"From: Mohamed Mediouni \n\nInstead of save/restore, fetch segments dynamically.\n\nRely on the fetched state instead of loading from memory.\n\nOr, if available, on the VM exit context.\n\nSigned-off-by: Mohamed Mediouni \nLink: https://lore.kernel.org/r/20260324151323.74473-12-mohamed@unpredictable.fr\nSigned-off-by: Paolo Bonzini \n---\n target/i386/whpx/whpx-all.c | 71 +++++++++++++++++++++++++++++++------\n 1 file changed, 60 insertions(+), 11 deletions(-)","diff":"diff --git a/target/i386/whpx/whpx-all.c b/target/i386/whpx/whpx-all.c\nindex 71b33a632ac..6f232786422 100644\n--- a/target/i386/whpx/whpx-all.c\n+++ b/target/i386/whpx/whpx-all.c\n@@ -868,21 +868,70 @@ static int whpx_handle_portio(CPUState *cpu,\n return 0;\n }\n \n+static void whpx_segment_to_x86_descriptor(CPUState *cpu, WHV_X64_SEGMENT_REGISTER* reg,\n+ struct x86_segment_descriptor *desc)\n+{\n+ uint32_t limit;\n+ desc->g = reg->Granularity;\n+\n+ /*\n+ * Hyper-V can return reg->Granularity == 0\n+ * with a higher limit than 0xfffff.\n+ *\n+ * Detect that case and set desc->g\n+ * with shifting the limit properly.\n+ */\n+ if (!desc->g && reg->Limit <= 0xfffff) {\n+ limit = reg->Limit;\n+ } else {\n+ limit = (reg->Limit >> 12);\n+ desc->g = 1;\n+ }\n+\n+ x86_set_segment_limit(desc, limit);\n+ x86_set_segment_base(desc, reg->Base);\n+\n+ desc->type = reg->SegmentType;\n+ desc->s = reg->NonSystemSegment;\n+ desc->dpl = reg->DescriptorPrivilegeLevel;\n+ desc->p = reg->Present;\n+ desc->avl = reg->Available;\n+ desc->l = reg->Long;\n+ desc->db = reg->Default;\n+}\n+\n+static void whpx_read_segment_descriptor(CPUState *cpu, WHV_X64_SEGMENT_REGISTER* reg,\n+ X86Seg seg)\n+{\n+ AccelCPUState *vcpu = cpu->accel;\n+ WHV_REGISTER_NAME reg_name = WHvX64RegisterEs + seg;\n+ WHV_REGISTER_VALUE val;\n+\n+ if (seg == R_CS) {\n+ *reg = vcpu->exit_ctx.VpContext.Cs;\n+ return;\n+ }\n+ if (vcpu->exit_ctx.ExitReason == WHvRunVpExitReasonX64IoPortAccess) {\n+ if (seg == R_DS) {\n+ *reg = vcpu->exit_ctx.IoPortAccess.Ds;\n+ return;\n+ } else if (seg == R_ES) {\n+ *reg = vcpu->exit_ctx.IoPortAccess.Es;\n+ return;\n+ }\n+ }\n+\n+ whpx_get_reg(cpu, reg_name, &val);\n+ *reg = val.Segment;\n+}\n+\n static void read_segment_descriptor(CPUState *cpu,\n struct x86_segment_descriptor *desc,\n enum X86Seg seg_idx)\n {\n- bool ret;\n- X86CPU *x86_cpu = X86_CPU(cpu);\n- CPUX86State *env = &x86_cpu->env;\n- SegmentCache *seg = &env->segs[seg_idx];\n- x86_segment_selector sel = { .sel = seg->selector & 0xFFFF };\n-\n- ret = x86_read_segment_descriptor(cpu, desc, sel);\n- if (ret == false) {\n- error_report(\"failed to read segment descriptor\");\n- abort();\n- }\n+ WHV_X64_SEGMENT_REGISTER reg;\n+ whpx_read_segment_descriptor(cpu, ®, seg_idx);\n+ whpx_segment_to_x86_descriptor(cpu, ®, desc);\n }\n \n static bool is_protected_mode(CPUState *cpu)\n","prefixes":["PULL","14/19"]}