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|
/******************************************************************************
* viridian.c
*
* An implementation of the Viridian hypercall interface.
*/
#include <xen/sched.h>
#include <xen/version.h>
#include <xen/perfc.h>
#include <xen/hypercall.h>
#include <xen/domain_page.h>
#include <asm/paging.h>
#include <asm/p2m.h>
#include <asm/hvm/support.h>
#include <public/sched.h>
#include <public/hvm/hvm_op.h>
/* Viridian MSR numbers. */
#define VIRIDIAN_MSR_GUEST_OS_ID 0x40000000
#define VIRIDIAN_MSR_HYPERCALL 0x40000001
#define VIRIDIAN_MSR_VP_INDEX 0x40000002
#define VIRIDIAN_MSR_EOI 0x40000070
#define VIRIDIAN_MSR_ICR 0x40000071
#define VIRIDIAN_MSR_TPR 0x40000072
/* Viridian Hypercall Status Codes. */
#define HV_STATUS_SUCCESS 0x0000
#define HV_STATUS_INVALID_HYPERCALL_CODE 0x0002
/* Viridian Hypercall Codes and Parameters. */
#define HvNotifyLongSpinWait 8
/* Viridian CPUID 4000003, Viridian MSR availability. */
#define CPUID3A_MSR_APIC_ACCESS (1 << 4)
#define CPUID3A_MSR_HYPERCALL (1 << 5)
#define CPUID3A_MSR_VP_INDEX (1 << 6)
/* Viridian CPUID 4000004, Implementation Recommendations. */
#define CPUID4A_MSR_BASED_APIC (1 << 3)
int cpuid_viridian_leaves(unsigned int leaf, unsigned int *eax,
unsigned int *ebx, unsigned int *ecx,
unsigned int *edx)
{
struct domain *d = current->domain;
if ( !is_viridian_domain(d) )
return 0;
leaf -= 0x40000000;
if ( leaf > 5 )
return 0;
*eax = *ebx = *ecx = *edx = 0;
switch ( leaf )
{
case 0:
*eax = 0x40000005; /* Maximum leaf */
*ebx = 0x7263694d; /* Magic numbers */
*ecx = 0x666F736F;
*edx = 0x76482074;
break;
case 1:
*eax = 0x31237648; /* Version number */
break;
case 2:
/* Hypervisor information, but only if the guest has set its
own version number. */
if ( d->arch.hvm_domain.viridian.guest_os_id.raw == 0 )
break;
*eax = 1; /* Build number */
*ebx = (xen_major_version() << 16) | xen_minor_version();
*ecx = 0; /* SP */
*edx = 0; /* Service branch and number */
break;
case 3:
/* Which hypervisor MSRs are available to the guest */
*eax = (CPUID3A_MSR_APIC_ACCESS |
CPUID3A_MSR_HYPERCALL |
CPUID3A_MSR_VP_INDEX);
break;
case 4:
/* Recommended hypercall usage. */
if ( (d->arch.hvm_domain.viridian.guest_os_id.raw == 0) ||
(d->arch.hvm_domain.viridian.guest_os_id.fields.os < 4) )
break;
*eax = CPUID4A_MSR_BASED_APIC;
*ebx = 2047; /* long spin count */
break;
}
return 1;
}
static void enable_hypercall_page(void)
{
struct domain *d = current->domain;
unsigned long gmfn = d->arch.hvm_domain.viridian.hypercall_gpa.fields.pfn;
unsigned long mfn = gmfn_to_mfn(d, gmfn);
uint8_t *p;
if ( !mfn_valid(mfn) ||
!get_page_and_type(mfn_to_page(mfn), d, PGT_writable_page) )
{
gdprintk(XENLOG_WARNING, "Bad GMFN %lx (MFN %lx)\n", gmfn, mfn);
return;
}
p = map_domain_page(mfn);
/*
* We set the bit 31 in %eax (reserved field in the Viridian hypercall
* calling convention) to differentiate Xen and Viridian hypercalls.
*/
*(u8 *)(p + 0) = 0x0d; /* orl $0x80000000, %eax */
*(u32 *)(p + 1) = 0x80000000;
*(u8 *)(p + 5) = 0x0f; /* vmcall/vmmcall */
*(u8 *)(p + 6) = 0x01;
*(u8 *)(p + 7) = ((boot_cpu_data.x86_vendor == X86_VENDOR_INTEL)
? 0xc1 : 0xd9);
*(u8 *)(p + 8) = 0xc3; /* ret */
memset(p + 9, 0xcc, PAGE_SIZE - 9); /* int3, int3, ... */
unmap_domain_page(p);
put_page_and_type(mfn_to_page(mfn));
}
int wrmsr_viridian_regs(uint32_t idx, uint32_t eax, uint32_t edx)
{
struct domain *d = current->domain;
uint64_t val = ((uint64_t)edx << 32) | eax;
if ( !is_viridian_domain(d) )
return 0;
switch ( idx )
{
case VIRIDIAN_MSR_GUEST_OS_ID:
perfc_incr(mshv_wrmsr_osid);
d->arch.hvm_domain.viridian.guest_os_id.raw = val;
gdprintk(XENLOG_INFO, "Guest os:\n");
gdprintk(XENLOG_INFO, "\tvendor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.vendor);
gdprintk(XENLOG_INFO, "\tos: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.os);
gdprintk(XENLOG_INFO, "\tmajor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.major);
gdprintk(XENLOG_INFO, "\tminor: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.minor);
gdprintk(XENLOG_INFO, "\tsp: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.service_pack);
gdprintk(XENLOG_INFO, "\tbuild: %x\n",
d->arch.hvm_domain.viridian.guest_os_id.fields.build_number);
break;
case VIRIDIAN_MSR_HYPERCALL:
perfc_incr(mshv_wrmsr_hc_page);
gdprintk(XENLOG_INFO, "Set hypercall page %"PRIx64".\n", val);
if ( d->arch.hvm_domain.viridian.guest_os_id.raw == 0 )
break;
d->arch.hvm_domain.viridian.hypercall_gpa.raw = val;
if ( d->arch.hvm_domain.viridian.hypercall_gpa.fields.enabled )
enable_hypercall_page();
break;
case VIRIDIAN_MSR_VP_INDEX:
perfc_incr(mshv_wrmsr_vp_index);
gdprintk(XENLOG_INFO, "Set VP index %"PRIu64".\n", val);
break;
case VIRIDIAN_MSR_EOI:
perfc_incr(mshv_wrmsr_eoi);
vlapic_EOI_set(vcpu_vlapic(current));
break;
case VIRIDIAN_MSR_ICR: {
struct vlapic *vlapic = vcpu_vlapic(current);
perfc_incr(mshv_wrmsr_icr);
eax &= ~(1 << 12);
edx &= 0xff000000;
vlapic_set_reg(vlapic, APIC_ICR2, edx);
if ( vlapic_ipi(vlapic, eax, edx) == X86EMUL_OKAY )
vlapic_set_reg(vlapic, APIC_ICR, eax);
break;
}
case VIRIDIAN_MSR_TPR:
perfc_incr(mshv_wrmsr_tpr);
vlapic_set_reg(vcpu_vlapic(current), APIC_TASKPRI, eax & 0xff);
break;
default:
return 0;
}
return 1;
}
int rdmsr_viridian_regs(uint32_t idx, uint32_t *eax, uint32_t *edx)
{
uint64_t val;
struct vcpu *v = current;
if ( !is_viridian_domain(v->domain) )
return 0;
switch ( idx )
{
case VIRIDIAN_MSR_GUEST_OS_ID:
perfc_incr(mshv_rdmsr_osid);
val = v->domain->arch.hvm_domain.viridian.guest_os_id.raw;
break;
case VIRIDIAN_MSR_HYPERCALL:
perfc_incr(mshv_rdmsr_hc_page);
val = v->domain->arch.hvm_domain.viridian.hypercall_gpa.raw;
break;
case VIRIDIAN_MSR_VP_INDEX:
perfc_incr(mshv_rdmsr_vp_index);
val = v->vcpu_id;
break;
case VIRIDIAN_MSR_ICR:
perfc_incr(mshv_rdmsr_icr);
val = (((uint64_t)vlapic_get_reg(vcpu_vlapic(v), APIC_ICR2) << 32) |
vlapic_get_reg(vcpu_vlapic(v), APIC_ICR));
break;
case VIRIDIAN_MSR_TPR:
perfc_incr(mshv_rdmsr_tpr);
val = vlapic_get_reg(vcpu_vlapic(v), APIC_TASKPRI);
break;
default:
return 0;
}
*eax = val;
*edx = val >> 32;
return 1;
}
int viridian_hypercall(struct cpu_user_regs *regs)
{
struct domain *d = current->domain;
int mode = hvm_guest_x86_mode(current);
unsigned long input_params_gpa, output_params_gpa;
uint16_t status = HV_STATUS_SUCCESS;
union hypercall_input {
uint64_t raw;
struct {
uint16_t call_code;
uint16_t rsvd1;
unsigned rep_count:12;
unsigned rsvd2:4;
unsigned rep_start:12;
unsigned rsvd3:4;
};
} input;
union hypercall_output {
uint64_t raw;
struct {
uint16_t result;
uint16_t rsvd1;
unsigned rep_complete:12;
unsigned rsvd2:20;
};
} output = { 0 };
ASSERT(is_viridian_domain(d));
switch ( mode )
{
#ifdef __x86_64__
case 8:
input.raw = regs->rcx;
input_params_gpa = regs->rdx;
output_params_gpa = regs->r8;
break;
#endif
case 4:
input.raw = ((uint64_t)regs->edx << 32) | regs->eax;
input_params_gpa = ((uint64_t)regs->ebx << 32) | regs->ecx;
output_params_gpa = ((uint64_t)regs->edi << 32) | regs->esi;
break;
default:
goto out;
}
switch ( input.call_code )
{
case HvNotifyLongSpinWait:
perfc_incr(mshv_call_long_wait);
do_sched_op_compat(SCHEDOP_yield, 0);
status = HV_STATUS_SUCCESS;
break;
default:
status = HV_STATUS_INVALID_HYPERCALL_CODE;
break;
}
out:
output.result = status;
switch (mode) {
#ifdef __x86_64__
case 8:
regs->rax = output.raw;
break;
#endif
default:
regs->edx = output.raw >> 32;
regs->eax = output.raw;
break;
}
return HVM_HCALL_completed;
}
static int viridian_save_cpu_ctxt(struct domain *d, hvm_domain_context_t *h)
{
struct hvm_viridian_context ctxt;
if ( !is_viridian_domain(d) )
return 0;
ctxt.hypercall_gpa = d->arch.hvm_domain.viridian.hypercall_gpa.raw;
ctxt.guest_os_id = d->arch.hvm_domain.viridian.guest_os_id.raw;
return (hvm_save_entry(VIRIDIAN, 0, h, &ctxt) != 0);
}
static int viridian_load_cpu_ctxt(struct domain *d, hvm_domain_context_t *h)
{
struct hvm_viridian_context ctxt;
if ( hvm_load_entry(VIRIDIAN, h, &ctxt) != 0 )
return -EINVAL;
d->arch.hvm_domain.viridian.hypercall_gpa.raw = ctxt.hypercall_gpa;
d->arch.hvm_domain.viridian.guest_os_id.raw = ctxt.guest_os_id;
return 0;
}
HVM_REGISTER_SAVE_RESTORE(VIRIDIAN, viridian_save_cpu_ctxt,
viridian_load_cpu_ctxt, 1, HVMSR_PER_DOM);
|
