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Respect and track the enable bit in the PCI configuration address word.

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Ignore writes, and return 0xff's, on config accesses when not set.
Behaviour now matches that seen on h/w.

Found with a NetBSD/amd64 guest.

Reviewed by:	tychon
MFC after:	3 weeks
This commit is contained in:
Peter Grehan 2014-04-25 17:35:34 +00:00
parent 459d6434a8
commit fcbec69157
Notes: svn2git 2020-12-20 02:59:44 +00:00 
svn path=/head/; revision=264921
1 changed files with 9 additions and 5 deletions
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14
usr.sbin/bhyve/pci_emul.c
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@ -1508,7 +1508,7 @@ pci_emul_hdrtype_fixup(int bus, int slot, int off, int bytes, uint32_t *rv)
}
}
static int cfgbus, cfgslot, cfgfunc, cfgoff;
static int cfgenable, cfgbus, cfgslot, cfgfunc, cfgoff;
static int
pci_emul_cfgaddr(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
@ -1527,9 +1527,12 @@ pci_emul_cfgaddr(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
(cfgslot << 11) |
(cfgfunc << 8) |
cfgoff;
*eax = x | CONF1_ENABLE;
if (cfgenable)
x |= CONF1_ENABLE;
*eax = x;
} else {
x = *eax;
cfgenable = (x & CONF1_ENABLE) == CONF1_ENABLE;
cfgoff = x & PCI_REGMAX;
cfgfunc = (x >> 8) & PCI_FUNCMAX;
cfgslot = (x >> 11) & PCI_SLOTMAX;
@ -1629,10 +1632,11 @@ pci_emul_cfgdata(struct vmctx *ctx, int vcpu, int in, int port, int bytes,
#endif
/*
* Just return if there is no device at this cfgslot:cfgfunc or
* if the guest is doing an un-aligned access
* Just return if there is no device at this cfgslot:cfgfunc,
* if the guest is doing an un-aligned access, or if the config
* address word isn't enabled.
*/
if (pi == NULL || (coff & (bytes - 1)) != 0) {
if (!cfgenable || pi == NULL || (coff & (bytes - 1)) != 0) {
if (in)
*eax = 0xffffffff;
return (0);