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x86: centralize setting SWIOTLB_FORCE when guest memory encryption is enabled 

Move enabling SWIOTLB_FORCE for guest memory encryption into common code.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Konrad Rzeszutek Wilk <konrad.wilk@oracle.com>
Tested-by: Boris Ostrovsky <boris.ostrovsky@oracle.com>
This commit is contained in:
Christoph Hellwig 2022-03-29 17:25:54 +02:00
parent 78013eaadf
commit a3e2309267
3 changed files with 8 additions and 11 deletions
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8
arch/x86/kernel/cpu/mshyperv.c
View File

@ -337,14 +337,6 @@ static void __init ms_hyperv_init_platform(void)
swiotlb_unencrypted_base = ms_hyperv.shared_gpa_boundary;
#endif
}
#ifdef CONFIG_SWIOTLB
/*
* Enable swiotlb force mode in Isolation VM to
* use swiotlb bounce buffer for dma transaction.
*/
swiotlb_force = SWIOTLB_FORCE;
#endif
/* Isolation VMs are unenlightened SEV-based VMs, thus this check: */
if (IS_ENABLED(CONFIG_AMD_MEM_ENCRYPT)) {
if (hv_get_isolation_type() != HV_ISOLATION_TYPE_NONE)

8
arch/x86/kernel/pci-dma.c
View File

@ -53,6 +53,14 @@ static void __init pci_swiotlb_detect(void)
if (cc_platform_has(CC_ATTR_HOST_MEM_ENCRYPT))
x86_swiotlb_enable = true;
/*
* Guest with guest memory encryption currently perform all DMA through
* bounce buffers as the hypervisor can't access arbitrary VM memory
* that is not explicitly shared with it.
*/
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
swiotlb_force = SWIOTLB_FORCE;
if (swiotlb_force == SWIOTLB_FORCE)
x86_swiotlb_enable = true;
}

3
arch/x86/mm/mem_encrypt_amd.c
View File

@ -432,9 +432,6 @@ void __init sme_early_init(void)
for (i = 0; i < ARRAY_SIZE(protection_map); i++)
protection_map[i] = pgprot_encrypted(protection_map[i]);
if (cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT))
swiotlb_force = SWIOTLB_FORCE;
x86_platform.guest.enc_status_change_prepare = amd_enc_status_change_prepare;
x86_platform.guest.enc_status_change_finish = amd_enc_status_change_finish;
x86_platform.guest.enc_tlb_flush_required = amd_enc_tlb_flush_required;