6.6-stable review patch. If anyone has any objections, please let me know.
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From: Greg Kroah-Hartman gregkh@linuxfoundation.org
This reverts commit 44a764aec64b3f3235b9cbac2525222f69685418 which is commit 9be15fbfc6c5c89c22cf6e209f66ea43ee0e58bb upstream.
This causes problems in older kernel trees as SNP host kdump is not supported in them, so drop it from the stable branches.
Reported-by: Ashish Kalra ashish.kalra@amd.com Link: https://lore.kernel.org/r/dacdff7f-0606-4ed5-b056-2de564404d51@amd.com Cc: Vasant Hegde vasant.hegde@amd.com Cc: Sairaj Kodilkar sarunkod@amd.com Cc: Joerg Roedel joerg.roedel@amd.com Cc: Sasha Levin sashal@kernel.org Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- drivers/iommu/amd/init.c | 28 +++++++++------------------- 1 file changed, 9 insertions(+), 19 deletions(-)
--- a/drivers/iommu/amd/init.c +++ b/drivers/iommu/amd/init.c @@ -840,16 +840,11 @@ static void iommu_enable_command_buffer(
BUG_ON(iommu->cmd_buf == NULL);
- if (!is_kdump_kernel()) { - /* - * Command buffer is re-used for kdump kernel and setting - * of MMIO register is not required. - */ - entry = iommu_virt_to_phys(iommu->cmd_buf); - entry |= MMIO_CMD_SIZE_512; - memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, - &entry, sizeof(entry)); - } + entry = iommu_virt_to_phys(iommu->cmd_buf); + entry |= MMIO_CMD_SIZE_512; + + memcpy_toio(iommu->mmio_base + MMIO_CMD_BUF_OFFSET, + &entry, sizeof(entry));
amd_iommu_reset_cmd_buffer(iommu); } @@ -898,15 +893,10 @@ static void iommu_enable_event_buffer(st
BUG_ON(iommu->evt_buf == NULL);
- if (!is_kdump_kernel()) { - /* - * Event buffer is re-used for kdump kernel and setting - * of MMIO register is not required. - */ - entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK; - memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET, - &entry, sizeof(entry)); - } + entry = iommu_virt_to_phys(iommu->evt_buf) | EVT_LEN_MASK; + + memcpy_toio(iommu->mmio_base + MMIO_EVT_BUF_OFFSET, + &entry, sizeof(entry));
/* set head and tail to zero manually */ writel(0x00, iommu->mmio_base + MMIO_EVT_HEAD_OFFSET);