xen/pt: mark reserved bits in PCI config space fields

The adjustments are solely to make the subsequent patches work right
(and hence make the patch set consistent), namely if permissive mode
(introduced by the last patch) gets used (as both reserved registers
and reserved fields must be similarly protected from guest access in
default mode, but the guest should be allowed access to them in
permissive mode).

This is a preparatory patch for XSA-131.

Signed-off-by: Jan Beulich <jbeulich@suse.com>

diff --git a/hw/pass-through.c b/hw/pass-through.c
index 5d0dd394ad489bd141f566a6631d81d1e32e511d..3bec1eff2b5d73aacbc2582ed2ea9b708737e443 100644 (file)
--- a/hw/pass-through.c
+++ b/hw/pass-through.c
@@ -283,7 +283,7 @@ static struct pt_reg_info_tbl pt_emu_reg_header0_tbl[] = {
         .offset     = PCI_COMMAND,
         .size       = 2,
         .init_val   = 0x0000,
-        .ro_mask    = 0xF880,
+        .res_mask   = 0xF880,
         .emu_mask   = 0x0743,
         .init       = pt_common_reg_init,
         .u.w.read   = pt_word_reg_read,
@@ -310,7 +310,8 @@ static struct pt_reg_info_tbl pt_emu_reg_header0_tbl[] = {
         .offset     = PCI_STATUS,
         .size       = 2,
         .init_val   = 0x0000,
-        .ro_mask    = 0x06FF,
+        .res_mask   = 0x0007,
+        .ro_mask    = 0x06F8,
         .emu_mask   = 0x0010,
         .init       = pt_status_reg_init,
         .u.w.read   = pt_word_reg_read,
@@ -496,7 +497,8 @@ static struct pt_reg_info_tbl pt_emu_reg_pm_tbl[] = {
         .offset     = PCI_PM_CTRL,
         .size       = 2,
         .init_val   = 0x0008,
-        .ro_mask    = 0xE1FC,
+        .res_mask   = 0x00F0,
+        .ro_mask    = 0xE10C,
         .emu_mask   = 0x8100,
         .init       = pt_pmcsr_reg_init,
         .u.w.read   = pt_word_reg_read,
@@ -508,7 +510,8 @@ static struct pt_reg_info_tbl pt_emu_reg_pm_tbl[] = {
         .offset     = PCI_PM_CTRL,
         .size       = 2,
         .init_val   = 0x0008,
-        .ro_mask    = 0xE1FC,
+        .res_mask   = 0x00F0,
+        .ro_mask    = 0xE10C,
         .emu_mask   = 0x810B,
         .init       = pt_pmcsr_reg_init,
         .u.w.read   = pt_word_reg_read,
@@ -656,7 +659,8 @@ static struct pt_reg_info_tbl pt_emu_reg_msi_tbl[] = {
         .offset     = PCI_MSI_FLAGS, // 2
         .size       = 2,
         .init_val   = 0x0000,
-        .ro_mask    = 0xFF8E,
+        .res_mask   = 0xFE00,
+        .ro_mask    = 0x018E,
         .emu_mask   = 0x017E,
         .init       = pt_msgctrl_reg_init,
         .u.w.read   = pt_word_reg_read,
@@ -779,7 +783,8 @@ static struct pt_reg_info_tbl pt_emu_reg_msix_tbl[] = {
         .offset     = PCI_MSI_FLAGS, // 2
         .size       = 2,
         .init_val   = 0x0000,
-        .ro_mask    = 0x3FFF,
+        .res_mask   = 0x3800,
+        .ro_mask    = 0x07FF,
         .emu_mask   = 0x0000,
         .init       = pt_msixctrl_reg_init,
         .u.w.read   = pt_word_reg_read,

diff --git a/hw/pass-through.h b/hw/pass-through.h
index 5adc12d6bfc52dc7a5ad87e391d476db7243181d..ab27725a8998e5fe2e5c6741ead25fdd6c4c7cfa 100644 (file)
--- a/hw/pass-through.h
+++ b/hw/pass-through.h
@@ -374,6 +374,8 @@ struct pt_reg_info_tbl {
     uint32_t size;
     /* reg initial value */
     uint32_t init_val;
+    /* reg reserved field mask (ON:reserved, OFF:defined) */
+    uint32_t res_mask;
     /* reg read only field mask (ON:RO/ROS, OFF:other) */
     uint32_t ro_mask;
     /* reg emulate field mask (ON:emu, OFF:passthrough) */