OvmfPkg/BaseMemEncryptSevLib: introduce MemEncryptSevClearMmioPageEncMask()
BZ: https://bugzilla.tianocore.org/show_bug.cgi?id=3275 The MemEncryptSevClearMmioPageEncMask() helper can be used for clearing the memory encryption mask for the Mmio region. The MemEncryptSevClearMmioPageEncMask() is a simplified version of MemEncryptSevClearPageEncMask() -- it does not flush the caches after clearing the page encryption mask. Cc: James Bottomley <jejb@linux.ibm.com> Cc: Min Xu <min.m.xu@intel.com> Cc: Jiewen Yao <jiewen.yao@intel.com> Cc: Tom Lendacky <thomas.lendacky@amd.com> Cc: Jordan Justen <jordan.l.justen@intel.com> Cc: Ard Biesheuvel <ardb+tianocore@kernel.org> Cc: Laszlo Ersek <lersek@redhat.com> Cc: Erdem Aktas <erdemaktas@google.com> Reviewed-by: Laszlo Ersek <lersek@redhat.com> Signed-off-by: Brijesh Singh <brijesh.singh@amd.com> Message-Id: <20210519181949.6574-10-brijesh.singh@amd.com>
This commit is contained in:
Brijesh Singh
committed by
mergify[bot]
mergify[bot]
parent
2b5b2ff04d
commit
901a9bfc3a
@@ -203,4 +203,29 @@ MemEncryptSevGetAddressRangeState (
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IN UINTN Length
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IN UINTN Length
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);
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);
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/**
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This function clears memory encryption bit for the MMIO region specified by
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BaseAddress and NumPages.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] BaseAddress The physical address that is the start
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address of a MMIO region.
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@param[in] NumPages The number of pages from start memory
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region.
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumPages
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);
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#endif // _MEM_ENCRYPT_SEV_LIB_H_
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#endif // _MEM_ENCRYPT_SEV_LIB_H_
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@@ -111,3 +111,34 @@ MemEncryptSevGetAddressRangeState (
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//
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//
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return MemEncryptSevAddressRangeEncrypted;
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return MemEncryptSevAddressRangeEncrypted;
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}
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}
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/**
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This function clears memory encryption bit for the MMIO region specified by
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BaseAddress and NumPages.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] BaseAddress The physical address that is the start
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address of a MMIO region.
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@param[in] NumPages The number of pages from start memory
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region.
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumPages
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)
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{
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//
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// Memory encryption bit is not accessible in 32-bit mode
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//
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return RETURN_UNSUPPORTED;
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}
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@@ -118,3 +118,36 @@ MemEncryptSevGetAddressRangeState (
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Length
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Length
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);
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);
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}
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}
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/**
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This function clears memory encryption bit for the mmio region specified by
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BaseAddress and NumPages.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] BaseAddress The physical address that is the start
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address of a mmio region.
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@param[in] NumPages The number of pages from start memory
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region.
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Number of pages is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encryption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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MemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS BaseAddress,
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IN UINTN NumPages
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)
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{
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return InternalMemEncryptSevClearMmioPageEncMask (
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Cr3BaseAddress,
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BaseAddress,
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EFI_PAGES_TO_SIZE (NumPages)
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);
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}
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@@ -891,3 +891,36 @@ InternalMemEncryptSevSetMemoryEncrypted (
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Flush
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Flush
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);
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);
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}
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}
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/**
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This function clears memory encryption bit for the MMIO region specified by
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PhysicalAddress and Length.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] PhysicalAddress The physical address that is the start
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address of a MMIO region.
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@param[in] Length The length of memory region
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Length is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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InternalMemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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)
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{
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return SetMemoryEncDec (
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Cr3BaseAddress,
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PhysicalAddress,
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Length,
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ClearCBit,
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FALSE
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);
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}
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@@ -98,3 +98,33 @@ InternalMemEncryptSevSetMemoryEncrypted (
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//
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//
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return RETURN_UNSUPPORTED;
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return RETURN_UNSUPPORTED;
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}
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}
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/**
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This function clears memory encryption bit for the MMIO region specified by
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PhysicalAddress and Length.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] PhysicalAddress The physical address that is the start
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address of a MMIO region.
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@param[in] Length The length of memory region
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Length is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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InternalMemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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)
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{
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//
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// This function is not available during SEC.
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//
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return RETURN_UNSUPPORTED;
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}
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@@ -126,4 +126,27 @@ InternalMemEncryptSevGetAddressRangeState (
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IN UINTN Length
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IN UINTN Length
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);
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);
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/**
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This function clears memory encryption bit for the MMIO region specified by
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PhysicalAddress and Length.
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@param[in] Cr3BaseAddress Cr3 Base Address (if zero then use
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current CR3)
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@param[in] PhysicalAddress The physical address that is the start
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address of a MMIO region.
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@param[in] Length The length of memory region
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@retval RETURN_SUCCESS The attributes were cleared for the
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memory region.
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@retval RETURN_INVALID_PARAMETER Length is zero.
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@retval RETURN_UNSUPPORTED Clearing the memory encyrption attribute
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is not supported
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**/
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RETURN_STATUS
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EFIAPI
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InternalMemEncryptSevClearMmioPageEncMask (
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IN PHYSICAL_ADDRESS Cr3BaseAddress,
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IN PHYSICAL_ADDRESS PhysicalAddress,
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IN UINTN Length
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);
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#endif
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#endif
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