linux-kernel - [RFC PATCH 3/5] drm/amdgpu: set passthrough mode for xen pvh/hvm

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Message-ID: <20230312120157.452859-4-ray.huang@amd.com>
Date:   Sun, 12 Mar 2023 20:01:55 +0800
From:   Huang Rui <ray.huang@....com>
To:     Juergen Gross <jgross@...e.com>,
        Stefano Stabellini <sstabellini@...nel.org>,
        Oleksandr Tyshchenko <oleksandr_tyshchenko@...m.com>,
        Boris Ostrovsky <boris.ostrovsky@...cle.com>,
        Roger Pau Monné <roger.pau@...rix.com>,
        <xen-devel@...ts.xenproject.org>, <linux-kernel@...r.kernel.org>,
        <dri-devel@...ts.freedesktop.org>, <amd-gfx@...ts.freedesktop.org>
CC:     Alex Deucher <alexander.deucher@....com>,
        Christian König <christian.koenig@....com>,
        "Stewart Hildebrand" <Stewart.Hildebrand@....com>,
        Xenia Ragiadakou <burzalodowa@...il.com>,
        Honglei Huang <honglei1.huang@....com>,
        Julia Zhang <julia.zhang@....com>,
        Chen Jiqian <Jiqian.Chen@....com>,
        Huang Rui <ray.huang@....com>
Subject: [RFC PATCH 3/5] drm/amdgpu: set passthrough mode for xen pvh/hvm

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>
---
 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 f2e2cbaa7fde..7b4369eba19d 100644
--- a/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
+++ b/drivers/gpu/drm/amd/amdgpu/amdgpu_virt.c
@@ -743,7 +743,8 @@ 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;
 	}
 
-- 
2.25.1