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powerpc/pseries/svm: Use shared memory for Debug Trace Log (DTL) 

Secure guests need to share the DTL buffers with the hypervisor. To that
end, use a kmem_cache constructor which converts the underlying buddy
allocated SLUB cache pages into shared memory.

Signed-off-by: Anshuman Khandual <khandual@linux.vnet.ibm.com>
Signed-off-by: Thiago Jung Bauermann <bauerman@linux.ibm.com>
Signed-off-by: Michael Ellerman <mpe@ellerman.id.au>
Link: https://lore.kernel.org/r/20190820021326.6884-10-bauerman@linux.ibm.com
This commit is contained in:
Anshuman Khandual 2019-08-19 23:13:19 -03:00 committed by Michael Ellerman
parent bd104e6db6
commit d5394c059d
4 changed files with 50 additions and 1 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

5
arch/powerpc/include/asm/svm.h
View File

@ -15,6 +15,9 @@ static inline bool is_secure_guest(void)
return mfmsr() & MSR_S;
}
void dtl_cache_ctor(void *addr);
#define get_dtl_cache_ctor() (is_secure_guest() ? dtl_cache_ctor : NULL)
#else /* CONFIG_PPC_SVM */
static inline bool is_secure_guest(void)
@ -22,5 +25,7 @@ static inline bool is_secure_guest(void)
return false;
}
#define get_dtl_cache_ctor() NULL
#endif /* CONFIG_PPC_SVM */
#endif /* _ASM_POWERPC_SVM_H */

1
arch/powerpc/platforms/pseries/Makefile
View File

@ -26,6 +26,7 @@ obj-$(CONFIG_IBMVIO) += vio.o
obj-$(CONFIG_IBMEBUS) += ibmebus.o
obj-$(CONFIG_PAPR_SCM) += papr_scm.o
obj-$(CONFIG_PPC_SPLPAR) += vphn.o
obj-$(CONFIG_PPC_SVM) += svm.o
ifdef CONFIG_PPC_PSERIES
obj-$(CONFIG_SUSPEND) += suspend.o

5
arch/powerpc/platforms/pseries/setup.c
View File

@ -69,6 +69,7 @@
#include <asm/security_features.h>
#include <asm/asm-const.h>
#include <asm/swiotlb.h>
#include <asm/svm.h>
#include "pseries.h"
#include "../../../../drivers/pci/pci.h"
@ -297,8 +298,10 @@ static inline int alloc_dispatch_logs(void)
static int alloc_dispatch_log_kmem_cache(void)
{
void (*ctor)(void *) = get_dtl_cache_ctor();
dtl_cache = kmem_cache_create("dtl", DISPATCH_LOG_BYTES,
DISPATCH_LOG_BYTES, 0, NULL);
DISPATCH_LOG_BYTES, 0, ctor);
if (!dtl_cache) {
pr_warn("Failed to create dispatch trace log buffer cache\n");
pr_warn("Stolen time statistics will be unreliable\n");

40
arch/powerpc/platforms/pseries/svm.c Normal file
View File

@ -0,0 +1,40 @@
// SPDX-License-Identifier: GPL-2.0+
/*
* Secure VM platform
*
* Copyright 2018 IBM Corporation
* Author: Anshuman Khandual <khandual@linux.vnet.ibm.com>
*/
#include <linux/mm.h>
#include <asm/ultravisor.h>
/* There's one dispatch log per CPU. */
#define NR_DTL_PAGE (DISPATCH_LOG_BYTES * CONFIG_NR_CPUS / PAGE_SIZE)
static struct page *dtl_page_store[NR_DTL_PAGE];
static long dtl_nr_pages;
static bool is_dtl_page_shared(struct page *page)
{
long i;
for (i = 0; i < dtl_nr_pages; i++)
if (dtl_page_store[i] == page)
return true;
return false;
}
void dtl_cache_ctor(void *addr)
{
unsigned long pfn = PHYS_PFN(__pa(addr));
struct page *page = pfn_to_page(pfn);
if (!is_dtl_page_shared(page)) {
dtl_page_store[dtl_nr_pages] = page;
dtl_nr_pages++;
WARN_ON(dtl_nr_pages >= NR_DTL_PAGE);
uv_share_page(pfn, 1);
}
}