diff options
Diffstat (limited to 'usr.sbin/bhyve/xmsr.c')
| -rw-r--r-- | usr.sbin/bhyve/xmsr.c | 223 |
1 files changed, 5 insertions, 218 deletions
diff --git a/usr.sbin/bhyve/xmsr.c b/usr.sbin/bhyve/xmsr.c index cc148d6f96db..9c05f0230c9b 100644 --- a/usr.sbin/bhyve/xmsr.c +++ b/usr.sbin/bhyve/xmsr.c @@ -29,233 +29,20 @@ #include <sys/cdefs.h> __FBSDID("$FreeBSD$"); -#include <sys/param.h> -#include <x86/apicreg.h> +#include <sys/types.h> -#include <assert.h> -#include <stdio.h> -#include <stdlib.h> #include <machine/vmm.h> #include <vmmapi.h> -#include "fbsdrun.h" -#include "xmsr.h" - -/* - * Trampoline for hypervisor direct 64-bit jump. - * - * 0 - signature for guest->host verification - * 8 - kernel virtual address of trampoline - * 16 - instruction virtual address - * 24 - stack pointer virtual address - * 32 - CR3, physical address of kernel page table - * 40 - 24-byte area for null/code/data GDT entries - */ -#define MP_V64T_SIG 0xcafebabecafebabeULL -struct mp_v64tramp { - uint64_t mt_sig; - uint64_t mt_virt; - uint64_t mt_eip; - uint64_t mt_rsp; - uint64_t mt_cr3; - uint64_t mt_gdtr[3]; -}; - -/* - * CPU 0 is considered to be the BSP and is set to the RUNNING state. - * All other CPUs are set up in the INIT state. - */ -#define BSP 0 -enum cpu_bstate { - CPU_S_INIT, - CPU_S_SIPI, - CPU_S_RUNNING -} static cpu_b[VM_MAXCPU] = { [BSP] = CPU_S_RUNNING }; +#include <stdio.h> +#include <stdlib.h> -static void spinup_ap(struct vmctx *, int, int, uint64_t *); -static void spinup_ap_direct64(struct vmctx *, int, uintptr_t, uint64_t *); +#include "xmsr.h" int emulate_wrmsr(struct vmctx *ctx, int vcpu, uint32_t code, uint64_t val) { - int dest; - int mode; - int thiscpu; - int vec; - int error, retval; - uint64_t rip; - - retval = vcpu; - thiscpu = 1 << vcpu; - - /* - * The only MSR value handled is the x2apic CR register - */ - if (code != 0x830) { - printf("Unknown WRMSR code %x, val %lx, cpu %d\n", - code, val, vcpu); - exit(1); - } - - /* - * The value written to the MSR will generate an IPI to - * a set of CPUs. If this is a SIPI, create the initial - * state for the CPU and switch to it. Otherwise, inject - * an interrupt for the destination CPU(s), and request - * a switch to the next available one by returning -1 - */ - dest = val >> 32; - vec = val & APIC_VECTOR_MASK; - mode = val & APIC_DELMODE_MASK; - - switch (mode) { - case APIC_DELMODE_INIT: - /* - * Ignore legacy de-assert INITs in x2apic mode - */ - if ((val & APIC_LEVEL_MASK) == APIC_LEVEL_DEASSERT) { - break; - } - - assert(dest != 0); - assert(dest < guest_ncpus); - assert(cpu_b[dest] == CPU_S_INIT); - - /* - * Move CPU to wait-for-SIPI state - */ - error = vcpu_reset(ctx, dest); - assert(error == 0); - - cpu_b[dest] = CPU_S_SIPI; - break; - - case APIC_DELMODE_STARTUP: - assert(dest != 0); - assert(dest < guest_ncpus); - /* - * Ignore SIPIs in any state other than wait-for-SIPI - */ - if (cpu_b[dest] != CPU_S_SIPI) { - break; - } - - /* - * Bring up the AP and signal the main loop that it is - * available and to switch to it. - */ - spinup_ap(ctx, dest, vec, &rip); - cpu_b[dest] = CPU_S_RUNNING; - fbsdrun_addcpu(ctx, dest, rip); - retval = dest; - break; - - default: - printf("APIC delivery mode %lx not supported!\n", - val & APIC_DELMODE_MASK); - exit(1); - } - - return (retval); -} - -/* - * There are 2 startup modes possible here: - * - if the CPU supports 'unrestricted guest' mode, the spinup can - * set up the processor state in power-on 16-bit mode, with the CS:IP - * init'd to the specified low-mem 4K page. - * - if the guest has requested a 64-bit trampoline in the low-mem 4K - * page by placing in the specified signature, set up the register - * state using register state in the signature. Note that this - * requires accessing guest physical memory to read the signature - * while 'unrestricted mode' does not. - */ -static void -spinup_ap(struct vmctx *ctx, int newcpu, int vector, uint64_t *rip) -{ - int error; - uint16_t cs; - uint64_t desc_base; - uint32_t desc_limit, desc_access; - - if (fbsdrun_vmexit_on_hlt()) { - error = vm_set_capability(ctx, newcpu, VM_CAP_HALT_EXIT, 1); - assert(error == 0); - } - - if (fbsdrun_vmexit_on_pause()) { - error = vm_set_capability(ctx, newcpu, VM_CAP_PAUSE_EXIT, 1); - assert(error == 0); - } - - error = vm_set_capability(ctx, newcpu, VM_CAP_UNRESTRICTED_GUEST, 1); - if (error) { - /* - * If the guest does not support real-mode execution then - * we will bring up the AP directly in 64-bit mode. - */ - spinup_ap_direct64(ctx, newcpu, vector << PAGE_SHIFT, rip); - } else { - /* - * Update the %cs and %rip of the guest so that it starts - * executing real mode code at at 'vector << 12'. - */ - *rip = 0; - error = vm_set_register(ctx, newcpu, VM_REG_GUEST_RIP, *rip); - assert(error == 0); - - error = vm_get_desc(ctx, newcpu, VM_REG_GUEST_CS, &desc_base, - &desc_limit, &desc_access); - assert(error == 0); - - desc_base = vector << PAGE_SHIFT; - error = vm_set_desc(ctx, newcpu, VM_REG_GUEST_CS, - desc_base, desc_limit, desc_access); - assert(error == 0); - - cs = (vector << PAGE_SHIFT) >> 4; - error = vm_set_register(ctx, newcpu, VM_REG_GUEST_CS, cs); - assert(error == 0); - } -} - -static void -spinup_ap_direct64(struct vmctx *ctx, int newcpu, uintptr_t gaddr, - uint64_t *rip) -{ - struct mp_v64tramp *mvt; - char *errstr; - int error; - uint64_t gdtbase; - - mvt = paddr_guest2host(gaddr); - - assert(mvt->mt_sig == MP_V64T_SIG); - - /* - * Set up the 3-entry GDT using memory supplied in the - * guest's trampoline structure. - */ - vm_setup_freebsd_gdt(mvt->mt_gdtr); - -#define CHECK_ERROR(msg) \ - if (error != 0) { \ - errstr = msg; \ - goto err_exit; \ - } - - /* entry point */ - *rip = mvt->mt_eip; - - /* Get the guest virtual address of the GDT */ - gdtbase = mvt->mt_virt + __offsetof(struct mp_v64tramp, mt_gdtr); - - error = vm_setup_freebsd_registers(ctx, newcpu, mvt->mt_eip, - mvt->mt_cr3, gdtbase, mvt->mt_rsp); - CHECK_ERROR("vm_setup_freebsd_registers"); - return; -err_exit: - printf("spinup_ap_direct64: machine state error: %s", errstr); + printf("Unknown WRMSR code %x, val %lx, cpu %d\n", code, val, vcpu); exit(1); } |