vgsp: m143 (1.0 P1) - 2GiB turing type, BAR1 size = fb_emul_size, script accepts -1g/-2g

1 files changed, 15 insertions, 4 deletions

diff --git a/kernel/bar_init.c b/kernel/bar_init.c
index f4c982a..b5703d8 100644
--- a/kernel/bar_init.c
+++ b/kernel/bar_init.c
@@ -56,20 +56,31 @@ int nv_vgpu_bar_init(struct nv_vgpu_device *vgpu)
 	bar_size = pci_resource_len(pdev, 1);
 	if (bar_addr && bar_size) {
 		vgpu->bars[1].gpa = bar_addr;
-		vgpu->bars[1].size = bar_size;
+		/*
+		 * m143 (1.0 VRAM sizes): expose the EMULATED framebuffer size as
+		 * BAR1's size, not the physical aperture. The guest derives its
+		 * BAR1 from the VFIO region info (config-space BAR writes are
+		 * ignored) and every GSCI/PFB report already carries
+		 * fb_emul_size; leaving the physical 256 MB here made 1G/2G types
+		 * tell the guest one size and expose another (the shadow is
+		 * fb_emul_size, so vidmem bounds and mmap math must match it).
+		 */
+		vgpu->bars[1].size = nv_vgpu_fb_emul_size(vgpu);
 		/* Emulated vidmem: a dedicated host-RAM buffer backing the guest's
 		 * VRAM aperture. Do NOT map the host GPU's real BAR1 - guest VRAM
 		 * accesses must hit our own clean buffer, not the (broken) host
 		 * GPU's VRAM. Allocated lazily on first use to keep mdev create
-		 * cheap; 256MB to match the GSCI fb size. */
+		 * cheap; sized by the mdev type (512M/1G/2G). */
 		vgpu->bars[1].vaddr = vzalloc(nv_vgpu_fb_emul_size(vgpu));
 		if (!vgpu->bars[1].vaddr) {
 			nv_vgpu_err(vgpu, "Failed to allocate emulated vidmem (%llu MiB)",
 				    (unsigned long long)(nv_vgpu_fb_emul_size(vgpu) >> 20));
 			return -ENOMEM;
 		}
-		nv_vgpu_info(vgpu, "BAR1: gpa=0x%llx, size=0x%llx, emulated vidmem=%p",
-			     bar_addr, bar_size, vgpu->bars[1].vaddr);
+		nv_vgpu_info(vgpu, "BAR1: gpa=0x%llx, size=0x%llx (emulated, %llu MiB), emulated vidmem=%p",
+			     bar_addr, vgpu->bars[1].size,
+			     (unsigned long long)(nv_vgpu_fb_emul_size(vgpu) >> 20),
+			     vgpu->bars[1].vaddr);
 	}
 
 	bar_addr = pci_resource_start(pdev, 2);