linux-kernel - [PATCH 1/2] drm/amdgpu: set passthrough mode for xen pvh/hvm

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Message-ID: <20241105060531.3503788-2-Jiqian.Chen@amd.com>
Date: Tue, 5 Nov 2024 14:05:30 +0800
From: Jiqian Chen <Jiqian.Chen@....com>
To: Alex Deucher <alexander.deucher@....com>,
	Christian König <christian.koenig@....com>, Xinhui Pan
	<Xinhui.Pan@....com>
CC: <amd-gfx@...ts.freedesktop.org>, <linux-kernel@...r.kernel.org>,
	Pierre-Eric Pelloux-Prayer <pierre-eric.pelloux-prayer@....com>, Huang Rui
	<ray.huang@....com>, Jiqian Chen <Jiqian.Chen@....com>
Subject: [PATCH 1/2] drm/amdgpu: set passthrough mode for xen pvh/hvm

From: Huang Rui <ray.huang@....com>

There is an second stage translation between the guest machine address
and host machine address in Xen PVH/HVM. The PCI bar address in the xen
guest kernel are not translated at the second stage on Xen PVH/HVM, so
it's not the real physical address that hardware would like to know, so
we need to set passthrough mode for Xen PVH/HVM as well.

Signed-off-by: Huang Rui <ray.huang@....com>
Signed-off-by: Jiqian Chen <Jiqian.Chen@....com>
---
 drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
index b6397d3229e1..0836fb77b263 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -764,7 +764,8 @@ void amdgpu_detect_virtualization(struct amdgpu_device *adev)
 
 	if (!reg) {
 		/* passthrough mode exclus sriov mod */
-		if (is_virtual_machine() && !xen_initial_domain())
+		if (is_virtual_machine() &&
+		    !(xen_initial_domain() && xen_pv_domain()))
 			adev->virt.caps |= AMDGPU_PASSTHROUGH_MODE;
 	}
 
-- 
2.34.1