bool XenDriver::mtrrType( unsigned long long guestAddress, uint8_t &type ) const throw()
{
const uint8_t MTRR_TYPE_UNCACHABLE = 0;
const uint8_t MTRR_TYPE_WRTHROUGH = 4;
int32_t seg, index;
uint8_t overlap_mtrr = 0, overlap_mtrr_pos = 0;
static bool hwMtrrInit = false;
static struct hvm_hw_mtrr hwMtrr;
if ( !hwMtrrInit ) {
StatsCollector::instance().incStat( "partialContext" );
StatsCollector::instance().incStat( "partialMtrr" );
if ( xc_domain_hvm_getcontext_partial( xci_, domain_, HVM_SAVE_CODE( MTRR ), 0, &hwMtrr,
sizeof( hwMtrr ) ) != 0 ) {
if ( logHelper_ )
logHelper_->error( std::string( "xc_domain_hvm_getcontext_partial() failed: " ) +
strerror( errno ) );
return false;
} else
hwMtrrInit = true;
}
uint8_t def_type = hwMtrr.msr_mtrr_def_type & 0xff;
uint8_t enabled = hwMtrr.msr_mtrr_def_type >> 10;
uint8_t *u8_fixed = ( uint8_t * )hwMtrr.msr_mtrr_fixed;
if ( !( enabled & 0x2 ) ) {
type = MTRR_TYPE_UNCACHABLE;
return true;
}
if ( ( guestAddress < 0x100000 ) && ( enabled & 1 ) ) {
/* Fixed range MTRR takes effective */
int32_t addr = ( uint32_t )guestAddress;
if ( addr < 0x80000 ) {
seg = ( addr >> 16 );
return u8_fixed[seg];
} else if ( addr < 0xc0000 ) {
unsigned long xc_translate_foreign_address(int xc_handle, uint32_t dom,
int vcpu, unsigned long long virt)
{
xc_dominfo_t dominfo;
uint64_t paddr, mask, pte = 0;
int size, level, pt_levels = 2;
void *map;
if (xc_domain_getinfo(xc_handle, dom, 1, &dominfo) != 1
|| dominfo.domid != dom)
return 0;
/* What kind of paging are we dealing with? */
if (dominfo.hvm) {
struct hvm_hw_cpu ctx;
if (xc_domain_hvm_getcontext_partial(xc_handle, dom,
HVM_SAVE_CODE(CPU), vcpu,
&ctx, sizeof ctx) != 0)
return 0;
if (!(ctx.cr0 & CR0_PG))
return virt >> PAGE_SHIFT;
pt_levels = (ctx.msr_efer&EFER_LMA) ? 4 : (ctx.cr4&CR4_PAE) ? 3 : 2;
paddr = ctx.cr3 & ((pt_levels == 3) ? ~0x1full : ~0xfffull);
} else {
