HV: add support for PIO bar emulation

For PIO bar emulation, initially or when guest reprograms the PIO bar, allow guest
access for the specified bar base address (pio port) and sized by calling vev_pt_allow_io_vbar

For PIO bar emulation, just set the initial vbar base address equal to pbar
base address. For example, if the pbar base address is 0x2000, then set the
initial vbar base address also to 0x2000

Tracked-On: projectacrn#3241
Signed-off-by: dongshen <dongsheng.x.zhang@intel.com>
Reviewed-by: Eddie Dong <eddie.dong@intel.com>

hypervisor/dm/vpci/pci_pt.c

@@ -30,6 +30,7 @@
 #include <errno.h>
 #include <ept.h>
 #include <mmu.h>
+#include <vmx.h>
 #include <logmsg.h>
 #include "vpci_priv.h"
 
@@ -66,11 +67,6 @@ static uint64_t pci_bar_2_bar_base(const struct pci_bar *pbars, uint32_t nr_bars
 		enum pci_bar_type type = pci_get_bar_type(bar->reg.value);
 
 		switch (type) {
-		case PCIBAR_IO_SPACE:
-			/* IO bar, BITS 31-2 = base address, 4-byte aligned */
-			base = (uint64_t)(bar->reg.bits.io.base);
-			base <<= 2U;
-			break;
 
 		case PCIBAR_MEM32:
 			base = (uint64_t)(bar->reg.bits.mem.base);
@@ -258,6 +254,7 @@ static void vdev_pt_write_vbar(struct pci_vdev *vdev, uint32_t offset, uint32_t
 		enum pci_bar_type type = pci_get_bar_type(vbar->reg.value);
 
 		switch (type) {
+
 		case PCIBAR_MEM32:
 			base = git_size_masked_bar_base(vbar->size, (uint64_t)val);
 			set_vbar_base(vbar, (uint32_t)base);
@@ -373,8 +370,7 @@ void init_vdev_pt(struct pci_vdev *vdev)
 				break;
 
 			default:
-				vbar->reg.value = 0x0U;
-				vbar->size = 0UL;
+				/* Nothing to do in this case */
 				break;
 			}
 		}

hypervisor/include/hw/pci.h

@@ -227,9 +227,7 @@ static inline enum pci_bar_type pci_get_bar_type(uint32_t val)
 {
 	enum pci_bar_type type = PCIBAR_NONE;
 
-	if ((val & PCIM_BAR_SPACE) == PCIM_BAR_IO_SPACE) {
-		type = PCIBAR_IO_SPACE;
-	} else {
+	if ((val & PCIM_BAR_SPACE) != PCIM_BAR_IO_SPACE) {
 		switch (val & PCIM_BAR_MEM_TYPE) {
 		case PCIM_BAR_MEM_32:
 		case PCIM_BAR_MEM_1MB: