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ohhhhhhhhhhh (exclude linux-extra-rootfs.img build artifact)

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Linehu
2026-10-01 23:13:42 +08:00
parent 737a2cb0db
commit 1074962546
533 changed files with 133239 additions and 5460 deletions
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CODE/UTSM/vmm/virtio_mmio.c
+28
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@@ -12,6 +12,7 @@
#include <utsm/linux_loader.h>
#include <utsm/ept.h>
#include <utsm/vmx.h>
#include <utsm/dma.h>
#include <utsm/log.h>
#include <utsm/types.h>
#include "../arch/x86_64/limine.h"
@@ -52,6 +53,23 @@ static int g_vio_ready;
void *virtio_gpa_to_host(u64 gpa) {
u64 hpa = ept_gpa_to_hpa(gpa);
/* Guest CPU stores fault in and demand-map a page. virtio-blk READ
* buffers are often allocated but never stored by the vCPU first, so
* the EPT walk misses and the device must map the page itself.
* Skip GPA 0 (null) and MMIO (>= 0xF0000000). */
if (hpa == 0 && gpa >= 0x1000ULL && gpa < 0xF0000000ULL) {
u64 page = gpa & ~(EPT_PAGE_SIZE - 1);
static u32 demand_logs;
dkm_dma_buffer buf;
if (dma_alloc_pages(1, EPT_PAGE_SIZE, 0, &buf) == 0 &&
ept_map_range(page, buf.phys, EPT_PAGE_SIZE, EPT_RWX) == 0) {
hpa = buf.phys + (gpa & (EPT_PAGE_SIZE - 1));
if (demand_logs < 8) {
demand_logs++;
log_hex64("[VIO] demand-map gpa=", gpa);
}
}
}
if (hpa == 0) return (void *)0;
u64 hhdm = g_hhdm_request.response ? g_hhdm_request.response->offset : 0;
return (void *)(hhdm + hpa);
@@ -127,6 +145,13 @@ u64 virtio_mmio_read(u64 gpa, int width) {
case VIRTIO_MMIO_QUEUE_READY: return s->q[s->queue_sel].ready;
case VIRTIO_MMIO_INTERRUPT_STATUS:return s->interrupt_status;
case VIRTIO_MMIO_STATUS: return s->status;
case VIRTIO_MMIO_SHM_LEN_LOW:
case VIRTIO_MMIO_SHM_LEN_HIGH:
/* No SHM windows. Linux treats (u64)-1 as "region absent". */
return 0xFFFFFFFFu;
case VIRTIO_MMIO_SHM_BASE_LOW:
case VIRTIO_MMIO_SHM_BASE_HIGH:
return 0;
case VIRTIO_MMIO_CONFIG_GENERATION:return s->config_generation;
default:
/* device config 空间（0x100 起） */
@@ -155,6 +180,9 @@ void virtio_mmio_write(u64 gpa, u64 value, int width) {
case VIRTIO_MMIO_DEVICE_FEATURES_SEL:
s->dev_features_sel = v32;
break;
case VIRTIO_MMIO_SHM_SEL:
/* No SHM regions; selector is ignored. Length reads stay -1. */
break;
case VIRTIO_MMIO_DRIVER_FEATURES:
if (s->drv_features_sel == 0) {
s->driver_features = (s->driver_features & 0xFFFFFFFF00000000ULL) | v32;