mirror of
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6f92515e0f
per-cpu gdts (the previous fix was only stable for one qemu process at a time) Relevant thread: http://lists.freebsd.org/pipermail/freebsd-emulation/2008-May/004902.html - Bump PORTREVISION PR: ports/113430
111 lines
2.8 KiB
Text
111 lines
2.8 KiB
Text
Index: kqemu-freebsd.c
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@@ -38,6 +38,14 @@
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#else
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#include <machine/npx.h>
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#endif
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+#ifdef __x86_64__
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+#include <sys/smp.h>
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+#include <sys/pcpu.h>
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+#include <machine/pcb.h>
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+#include <machine/specialreg.h>
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+#include <machine/segments.h>
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+#include <machine/tss.h>
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+#endif
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#include "kqemu-kernel.h"
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@@ -248,6 +256,57 @@
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va_end(ap);
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}
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+#ifdef __x86_64__
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+int kqemu_cpu0gdtfixed;
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+int kqemu_gdts_used;
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+struct user_segment_descriptor *kqemu_gdts;
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+struct region_descriptor kqemu_r_newgdt;
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+extern struct pcpu __pcpu[];
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+
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+/* called with interrupts disabled */
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+void CDECL kqemu_tss_fixup(unsigned long kerngdtbase)
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+{
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+ int gsel_tss = GSEL(GPROC0_SEL, SEL_KPL);
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+ unsigned cpuid = PCPU_GET(cpuid);
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+ struct user_segment_descriptor *newgdt = gdt;
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+
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+ if (mp_ncpus <= 1 || kerngdtbase != (unsigned long)&gdt)
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+ /* UP host or gdt already moved, nothing to do */
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+ return;
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+ if (cpuid) {
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+ /* move gdts of all but first cpu */
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+ if (!kqemu_gdts)
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+ /*
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+ * XXX gdt is allocated as
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+ * struct user_segment_descriptor gdt[NGDT * MAXCPU];
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+ * so it has room for the moved copies; need to allocate at
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+ * kldload (and only free if kqemu_gdts_used is zero) should this
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+ * change in the future
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+ */
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+ kqemu_gdts = &gdt[NGDT];
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+ ++kqemu_gdts_used;
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+ newgdt = &kqemu_gdts[NGDT * (cpuid - 1)];
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+ bcopy(&gdt, newgdt, NGDT * sizeof(gdt[0]));
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+ kqemu_r_newgdt.rd_limit = NGDT * sizeof(gdt[0]) - 1;
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+ kqemu_r_newgdt.rd_base = (long) newgdt;
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+ } else {
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+ if (kqemu_cpu0gdtfixed)
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+ return;
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+ ++kqemu_cpu0gdtfixed;
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+ }
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+ gdt_segs[GPROC0_SEL].ssd_base = (long) &common_tss[cpuid];
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+ ssdtosyssd(&gdt_segs[GPROC0_SEL],
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+ (struct system_segment_descriptor *)&newgdt[GPROC0_SEL]);
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+ if (cpuid) {
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+ lgdt(&kqemu_r_newgdt);
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+ wrmsr(MSR_GSBASE, (u_int64_t)&__pcpu[cpuid]);
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+ wrmsr(MSR_KGSBASE, curthread->td_pcb->pcb_gsbase);
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+ wrmsr(MSR_FSBASE, 0);
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+ }
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+ ltr(gsel_tss);
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+}
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+#endif
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+
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struct kqemu_instance {
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#if __FreeBSD_version >= 500000
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TAILQ_ENTRY(kqemu_instance) kqemu_ent;
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Index: common/kernel.c
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@@ -1025,6 +1025,9 @@
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#ifdef __x86_64__
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uint16_t saved_ds, saved_es;
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unsigned long fs_base, gs_base;
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+#ifdef __FreeBSD__
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+ struct kqemu_global_state *g = s->global_state;
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+#endif
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#endif
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#ifdef PROFILE
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@@ -1188,6 +1191,13 @@
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apic_restore_nmi(s, apic_nmi_mask);
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}
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profile_record(s);
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+#ifdef __FreeBSD__
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+#ifdef __x86_64__
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+ spin_lock(&g->lock);
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+ kqemu_tss_fixup(s->kernel_gdt.base);
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+ spin_unlock(&g->lock);
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+#endif
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+#endif
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if (s->mon_req == MON_REQ_IRQ) {
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struct kqemu_exception_regs *r;
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Index: kqemu-kernel.h
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@@ -48,4 +48,10 @@
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void CDECL kqemu_log(const char *fmt, ...);
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+#ifdef __FreeBSD__
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+#ifdef __x86_64__
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+void CDECL kqemu_tss_fixup(unsigned long kerngdtbase);
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+#endif
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+#endif
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+
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#endif /* KQEMU_KERNEL_H */
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