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virtio: replace arch_has_restricted_virtio_memory_access()

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Instead of using arch_has_restricted_virtio_memory_access() together
with CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS, replace those
with platform_has() and a new platform feature
PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS.

Signed-off-by: Juergen Gross <jgross@suse.com>
Reviewed-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com>
Tested-by: Oleksandr Tyshchenko <oleksandr_tyshchenko@epam.com> # Arm64 only
Reviewed-by: Christoph Hellwig <hch@lst.de>
Acked-by: Borislav Petkov <bp@suse.de>
This commit is contained in:
Juergen Gross 2022-06-06 08:09:16 +02:00
parent 2130a790ca
commit 3f9dfbebdc
9 changed files with 14 additions and 38 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

1
arch/s390/Kconfig
View File

@ -768,7 +768,6 @@ menu "Virtualization"
config PROTECTED_VIRTUALIZATION_GUEST
def_bool n
prompt "Protected virtualization guest support"
select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
help
Select this option, if you want to be able to run this
kernel as a protected virtualization KVM guest.

13
arch/s390/mm/init.c
View File

@ -31,6 +31,7 @@
#include <linux/cma.h>
#include <linux/gfp.h>
#include <linux/dma-direct.h>
#include <linux/platform-feature.h>
#include <asm/processor.h>
#include <linux/uaccess.h>
#include <asm/pgalloc.h>
@ -168,22 +169,14 @@ bool force_dma_unencrypted(struct device *dev)
return is_prot_virt_guest();
}
#ifdef CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
int arch_has_restricted_virtio_memory_access(void)
{
return is_prot_virt_guest();
}
EXPORT_SYMBOL(arch_has_restricted_virtio_memory_access);
#endif
/* protected virtualization */
static void pv_init(void)
{
if (!is_prot_virt_guest())
return;
platform_set(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS);
/* make sure bounce buffers are shared */
swiotlb_init(true, SWIOTLB_FORCE | SWIOTLB_VERBOSE);
swiotlb_update_mem_attributes();

1
arch/x86/Kconfig
View File

@ -1542,7 +1542,6 @@ config X86_CPA_STATISTICS
config X86_MEM_ENCRYPT
select ARCH_HAS_FORCE_DMA_UNENCRYPTED
select DYNAMIC_PHYSICAL_MASK
select ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
def_bool n
config AMD_MEM_ENCRYPT

7
arch/x86/mm/mem_encrypt.c
View File

@ -12,7 +12,6 @@
#include <linux/swiotlb.h>
#include <linux/cc_platform.h>
#include <linux/mem_encrypt.h>
#include <linux/virtio_config.h>
/* Override for DMA direct allocation check - ARCH_HAS_FORCE_DMA_UNENCRYPTED */
bool force_dma_unencrypted(struct device *dev)
@ -87,9 +86,3 @@ void __init mem_encrypt_init(void)
print_mem_encrypt_feature_info();
}
int arch_has_restricted_virtio_memory_access(void)
{
return cc_platform_has(CC_ATTR_GUEST_MEM_ENCRYPT);
}
EXPORT_SYMBOL_GPL(arch_has_restricted_virtio_memory_access);

4
arch/x86/mm/mem_encrypt_amd.c
View File

@ -21,6 +21,7 @@
#include <linux/dma-mapping.h>
#include <linux/virtio_config.h>
#include <linux/cc_platform.h>
#include <linux/platform-feature.h>
#include <asm/tlbflush.h>
#include <asm/fixmap.h>
@ -242,6 +243,9 @@ void __init sev_setup_arch(void)
size = total_mem * 6 / 100;
size = clamp_val(size, IO_TLB_DEFAULT_SIZE, SZ_1G);
swiotlb_adjust_size(size);
/* Set restricted memory access for virtio. */
platform_set(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS);
}
static unsigned long pg_level_to_pfn(int level, pte_t *kpte, pgprot_t *ret_prot)

6
drivers/virtio/Kconfig
View File

@ -6,12 +6,6 @@ config VIRTIO
bus, such as CONFIG_VIRTIO_PCI, CONFIG_VIRTIO_MMIO, CONFIG_RPMSG
or CONFIG_S390_GUEST.
config ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
bool
help
This option is selected if the architecture may need to enforce
VIRTIO_F_ACCESS_PLATFORM
config VIRTIO_PCI_LIB
tristate
help

5
drivers/virtio/virtio.c
View File

@ -5,6 +5,7 @@
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/of.h>
#include <linux/platform-feature.h>
#include <uapi/linux/virtio_ids.h>
/* Unique numbering for virtio devices. */
@ -170,12 +171,10 @@ EXPORT_SYMBOL_GPL(virtio_add_status);
static int virtio_features_ok(struct virtio_device *dev)
{
unsigned int status;
int ret;
might_sleep();
ret = arch_has_restricted_virtio_memory_access();
if (ret) {
if (platform_has(PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS)) {
if (!virtio_has_feature(dev, VIRTIO_F_VERSION_1)) {
dev_warn(&dev->dev,
"device must provide VIRTIO_F_VERSION_1\n");

6
include/linux/platform-feature.h
View File

@ -6,7 +6,11 @@
#include <asm/platform-feature.h>
/* The platform features are starting with the architecture specific ones. */
#define PLATFORM_FEAT_N (0 + PLATFORM_ARCH_FEAT_N)
/* Used to enable platform specific DMA handling for virtio devices. */
#define PLATFORM_VIRTIO_RESTRICTED_MEM_ACCESS (0 + PLATFORM_ARCH_FEAT_N)
#define PLATFORM_FEAT_N (1 + PLATFORM_ARCH_FEAT_N)
void platform_set(unsigned int feature);
void platform_clear(unsigned int feature);

9
include/linux/virtio_config.h
View File

@ -604,13 +604,4 @@ static inline void virtio_cwrite64(struct virtio_device *vdev,
_r; \
})
#ifdef CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS
int arch_has_restricted_virtio_memory_access(void);
#else
static inline int arch_has_restricted_virtio_memory_access(void)
{
return 0;
}
#endif /* CONFIG_ARCH_HAS_RESTRICTED_VIRTIO_MEMORY_ACCESS */
#endif /* _LINUX_VIRTIO_CONFIG_H */