linux-kernel - [PATCH AUTOSEL 4.19 16/68] amd/iommu: Fix Guest Virtual APIC Log Tail Address Register

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Date:   Thu, 29 Nov 2018 00:55:07 -0500
From:   Sasha Levin <sashal@...nel.org>
To:     stable@...r.kernel.org, linux-kernel@...r.kernel.org
Cc:     Filippo Sironi <sironi@...zon.de>, Wei Wang <wawei@...zon.de>,
        Suravee Suthikulpanit <suravee.suthikulpanit@....com>,
        Joerg Roedel <jroedel@...e.de>,
        Sasha Levin <sashal@...nel.org>,
        iommu@...ts.linux-foundation.org
Subject: [PATCH AUTOSEL 4.19 16/68] amd/iommu: Fix Guest Virtual APIC Log Tail Address Register

From: Filippo Sironi <sironi@...zon.de>

[ Upstream commit ab99be4683d9db33b100497d463274ebd23bd67e ]

This register should have been programmed with the physical address
of the memory location containing the shadow tail pointer for
the guest virtual APIC log instead of the base address.

Fixes: 8bda0cfbdc1a  ('iommu/amd: Detect and initialize guest vAPIC log')
Signed-off-by: Filippo Sironi <sironi@...zon.de>
Signed-off-by: Wei Wang <wawei@...zon.de>
Signed-off-by: Suravee Suthikulpanit <suravee.suthikulpanit@....com>
Signed-off-by: Joerg Roedel <jroedel@...e.de>
Signed-off-by: Sasha Levin <sashal@...nel.org>
---
 drivers/iommu/amd_iommu_init.c | 3 ++-
 1 file changed, 2 insertions(+), 1 deletion(-)

diff --git a/drivers/iommu/amd_iommu_init.c b/drivers/iommu/amd_iommu_init.c
index 84b3e4445d46..e062ab9687c7 100644
--- a/drivers/iommu/amd_iommu_init.c
+++ b/drivers/iommu/amd_iommu_init.c
@@ -797,7 +797,8 @@ static int iommu_init_ga_log(struct amd_iommu *iommu)
 	entry = iommu_virt_to_phys(iommu->ga_log) | GA_LOG_SIZE_512;
 	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_BASE_OFFSET,
 		    &entry, sizeof(entry));
-	entry = (iommu_virt_to_phys(iommu->ga_log) & 0xFFFFFFFFFFFFFULL) & ~7ULL;
+	entry = (iommu_virt_to_phys(iommu->ga_log_tail) &
+		 (BIT_ULL(52)-1)) & ~7ULL;
 	memcpy_toio(iommu->mmio_base + MMIO_GA_LOG_TAIL_OFFSET,
 		    &entry, sizeof(entry));
 	writel(0x00, iommu->mmio_base + MMIO_GA_HEAD_OFFSET);
-- 
2.17.1